d10 METAL CARBENE COMPLEXES FOR OLED APPLICATIONS

Abstract

Described herein are two-coordinated d10 metal carbene complexes containing (i) Cu(I), Ag(I), or Au(I), (ii) a pyrazine-fused NHC ligand or a pyridine-fused NHC ligand, and (iii) a carbazole ligand, a pyrido[2,3-b]indole ligand, or a pyrido[3,4-b]indole ligand. The radiative properties of the compounds can be controlled by thermally activated delayed fluorescence. The emission colors of the complexes can be tuned by using carbazoles with varying donor strength. Also described are methods of using the complexes.

Claims

1. A compound having a structure: ##STR00083## wherein: the compound has an overall neutral, negative, or positive charge, M is copper, silver, or gold with an oxidation state of 0, +1, +2, or +3, preferably +1, P′ has the structure: ##STR00084## D is carbon, T, J, and W are independently carbon or nitrogen, wherein at least one of T, J, and W is nitrogen, wherein when T is carbon, J is nitrogen, or when T is nitrogen, J is carbon, and T, J, and W are bonded to one or no hydrogen atom according to valency, X and Y are independently carbon or nitrogen, wherein at least one of X and Y is nitrogen, and X and Y are bonded to one or no hydrogen atom according to valency, R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or R.sub.1, J, D, and R.sub.2 together form an unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl, R.sub.3 and R.sub.4 are independently hydrogen, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, R.sub.3′ and R4′ are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, and Z is substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted polyheterocyclyl, unsubstituted polyheterocyclyl, substituted heterocyclyl, or unsubstituted heterocyclyl, or —NR.sub.aR.sub.b, wherein R.sub.a and R.sub.b are independently hydrogen, substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C3.sup.−C20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted heterocyclyl, unsubstituted heterocyclyl, substituted alkyl, or unsubstituted alkyl, wherein (i) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted aryl, (ii) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted phenyl, (iii) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl, (iv) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl when M is Cu or Au, or (v) the compound is not ##STR00085##

2. The compound of claim 1, having a structure: ##STR00086## wherein CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, unsubstituted polyaryl, substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl.

3. The compound of claim 1, wherein R.sub.3′ and R.sub.4′ are absent.

4. The compound of claim 2, wherein CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, or unsubstituted polyaryl.

5. The compound of claim 2, wherein CY1 and CY2 are substituted aryl.

6. The compound of claim 1, having a structure: ##STR00087## wherein: R.sub.5 and R.sub.6 are independently substituted alkyl or unsubstituted alkyl, and n1 and n2 are independently integers between 0 and 5; between 1 and 5; between 3 and 5, such as 3; or between 2 and 5; such as 2.

7. The compound of claim 1, having a structure: ##STR00088## wherein: n1 and n2 are independently integers between 1 and 5, between 2 and 5, or between 3 and 5, L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or a fused combination thereof.

8. The compound of claim 1, having a structure: ##STR00089## wherein: each Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl, each Rb is independently unsubstituted alkyl, or substituted alkyl, L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and optionally wherein at least one of X and Y is nitrogen.

9. The compound of claim 1, wherein: (i) T is nitrogen, J is carbon, and W is carbon, (ii) T is nitrogen, J is carbon, and W is nitrogen, (iii) T is carbon, J is nitrogen, and W is carbon, or (iv) T is carbon, J is nitrogen, and W is nitrogen.

10. The compound of claim 8, wherein: Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl, and Rb is independently unsubstituted alkyl or substituted alkyl.

11. The compound of claim 1, wherein P′ is selected from: ##STR00090## wherein: Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl, and Rb is independently unsubstituted alkyl or substituted alkyl.

12. The compound of claim 8, wherein: Ra is independently hydrogen, methyl, iso-propyl, or —CH(C.sub.2H.sub.5).sub.2, and Rb is independently methyl, iso-propyl, or —CH(C.sub.2H.sub.5).sub.2.

13. The compound of claim 7, wherein CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

14. The compound of claim 7, wherein CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

15. The compound of claim 1, wherein Z has a structure: ##STR00091## wherein: X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, and X.sub.8 are independently carbon or nitrogen, Rx.sub.1, Rx.sub.2,Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, cyano, unsubstituted alkyl, substituted alkyl, unsubstituted alkoxy, substituted alkoxy, unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl, wherein each Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, or Rx.sub.8 is absent, when the corresponding X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, or X.sub.8 is nitrogen, or Rx.sub.4 is a bond connected to a substituent on L, or adjacent Rxn groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, wherein the n in the adjacent Rxn groups are sequential pairs of integers from 1 to 4, or 5 to 8, and L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl.

16. The compound of claim 1, wherein Z has a structure: ##STR00092## wherein: L′ is substituted aryl, unsubstituted aryl, substituted heteroaryl, or unsubstituted heteroaryl, preferably substituted aryl or unsubstituted aryl, preferably substituted phenyl or unsubstituted phenyl.

17. The compound of claim 15, wherein Z has a structure: ##STR00093##

18. The compound of claim 15, wherein Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, methyl, cyano, trifluoromethyl, tert-butyl, methoxy, phenyl, or pyridyl.

19. The compound of claim 1, wherein X and Y are nitrogen.

20. The compound of claim 1, having a structure: ##STR00094## preferably ##STR00095## wherein: V″ is carbon, U is carbon and V is nitrogen, or U is nitrogen and V is carbon, wherein U, V, and V″ are bonded to one or no hydrogen atom according to valency, Ra is hydrogen, unsubstituted alkyl, or substituted alkyl, R.sub.7 and R.sub.8 are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, cyano, halogen, hydroxyl, thiol, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, substituted aryl, unsubstituted aryl, or adjacent R.sub.7 groups or adjacent Rs groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, and n3 and n4 are independently integers between 0 and 5, such as 0, 1, 2, 3, 4, 5.

21. The compound of claim 20, having a structure: ##STR00096## preferably ##STR00097## wherein: Rv is absent, hydrogen, substituted alkyl, or unsubstituted alkyl, and R.sub.7 and R.sub.8 are independently hydrogen, substituted alkyl, unsubstituted alkyl, unsubstituted aryl, halogen, cyano, or Rv and R.sub.7 together with the atoms in the rings to which they are bonded form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C3.sup.−C20 cycloalkenyl, or a fused combination thereof.

22. The compound of claim 20, wherein: Rv is absent or hydrogen, R.sub.7 and R.sub.8 are independently hydrogen, iso-propyl, tert-butyl, phenyl, fluorine, or cyano, or Rv and R.sub.7 together form ##STR00098##

23. The compound of claim 20, wherein: R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, or R.sub.1 and R.sub.2 with the atoms in the ring to which they are bonded together form unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl.

24. The compound of claim 20, wherein: R.sub.1 and R.sub.2 are hydrogen, or R.sub.1 and R.sub.2 together form the structure: ##STR00099##

25. The compound of claim 24, having a structure: ##STR00100## preferably ##STR00101## wherein: (i) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H; (ii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=CN; (iii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl; (iv) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=phenyl; (v) M=Cu(I); W=N; Ra=H; U=CH; V=N; V″=carbon; Rv=absent; R.sub.7=R.sub.8=H; (vi) M=Cu(I); W=U=CH; V=V″=carbon; Rv=H; Ra=iso-propyl; R.sub.7=R.sub.8=H; (vii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form ##STR00102## (viii) M=Cu(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form ##STR00103## (ix) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H; (x) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F; (xi) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=methyl; (xii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H; (xiii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=H, R.sub.8=CN; (xiv) M=Au(I); W=N; Ra=H; U=N; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H; (xv) M=Au(I); W=U=CH; V=carbon; Rv=H; ; Ra=iso-propyl; V″=carbon; R.sub.7=R.sub.8=H; (xvi) M=Au(I); W=N; Ra=H; U=CH; V=N; Rv=absent; V″=carbon; R.sub.7=R.sub.8=H; (xvii) M=Au(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=CN; (xviii) M=Au(I); W=N; Ra=hydrogen; U=CH; V=V″=carbon; R.sub.8 =H; Rv and R.sub.7 together form ##STR00104## (xix) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl; (xx) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F; (xxi) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8 =H; (xxii) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8 =tert-butyl; (xxiii) M=Ag(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8 =H; for (i), (ii), (iii), (iv), (v), (vi), (vii), (viii), (xii), (xiii), (xiv), (xv), (xvi), (xvii), (xviii), (xix), (xx), and (xxiii), the dashed lines denote the absence of bonds, and for (ix), (x), (xi), (xxi), and (xxii), the dashed lines denote the presence of bonds.

26. The compound of claim 1, having a structure: ##STR00105## ##STR00106## ##STR00107## ##STR00108## ##STR00109## ##STR00110## ##STR00111## wherein M=Cu(I), Au(I), or Ag(I).

27. The compound of claim 1, wherein substituted means substituted with one or more substituents selected from: halogen, hydroxyl, thiol, nitro-, unsubstituted alkyl, unsubstituted alkenyl, unsubstituted alkynyl, unsubstituted aryl, unsubstituted heteroaryl, unsubstituted arylalkyl, unsubstituted alkoxy, unsubstituted aroxy, unsubstituted alkylthio, unsubstituted arylthio, cyano, isocyano, unsubstituted carbonyl, unsubstituted carboxyl, oxo, unsubstituted amino, unsubstituted amido, unsubstituted sulfonyl, unsubstituted sulfonic acid, unsubstituted phosphoryl, unsubstituted phosphonyl, unsubstituted polyaryl, or unsubstituted C.sub.3-C.sub.20 cycloalkyl, and unsubstituted heterocyclyl.

28. An organic electronic component comprising the compound of claim 1.

29. The organic electronic component of claim 28, wherein the organic electronic component is an organic light-emitting diode (OLED) or a light-emitting electrochemical cell (LEEC).

30. The organic electronic component of claim 28, wherein the compounds are in a light-emitting layer.

31. The organic electronic component of claim 28, further comprising an anode, a cathode, a hole transport region, and an electron transport region, wherein the hole transport region comprises a hole injection layer and/or a hole transport layer, and optionally an electron blocking layer, wherein the electron transport region comprises an electron transport layer and/or an electron injection layer, and optionally a hole blocking layer, wherein the light emitting layer is located in between the anode and the cathode, wherein the hole transport region is located between the anode and the light-emitting layer, and wherein the electron transport region is located in between the cathode and the light-emitting layer.

32. The organic electronic component of claim 29, wherein the light-emitting layer is fabricated by vacuum deposition, spin-coating or ink printing (such as, ink-jet printing or roll-to-roll printing).

33. A light-emitting layer comprising the compound of claim 1.

34. A light-emitting layer comprising the compound of claim 1 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter.

35. A light-emitting layer comprising the compound of claim 1 and a pure organic emitter, wherein the compound has a higher-lying singlet state than the pure organic emitter.

36. A light-emitting layer comprising the compound of claim 1 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter that exhibits thermally activated delayed fluorescence.

37. A light-emitting layer comprising the compound of claim 1 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter that is boron-based.

38. An OLED, comprising the light-emitting layer of claim 33.

39. A device, comprising the OLED of claim 38, wherein the device is selected from stationary visual display units, mobile visual display units, illumination units, keyboards, clothes, ornaments, garment accessories, wearable devices, medical monitoring devices, wall papers, tablet computers, laptops, advertisement panels, panel display units, household appliances, or office appliances.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 shows chemical structures of metal carbene complexes denoted Cu1, Cu2, Cu3, Cu4, Cu5, Cu6, Cu1, Cu8, Cu9, Cu10, Cu11, Au1, Au2, Au3, Au4, Au5, Au6, Au7, Au8, Au9, Au10, Au11, and Ag1.

[0045] FIGS. 2A, 2B, 2C, 2D, 2E, and 2F show the crystal structures of Au1, Au4, Au8, Au9, Cu3, and Cu6, respectively, shown in FIG. 1.

[0046] FIGS. 3A-3D are line graphs showing electroluminescent spectra and performance characteristics of Cu1-based devices with doping concentration of 2-8wt/wt %. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: TPBi: Cu1 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm).

[0047] FIGS. 4A-4D are line graphs showing electroluminescent spectra and performance characteristics of devices of Cu2 with doping concentration of 2-6 wt/wt %. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: DPEPO: Cu2 (20 nm)/DPEPO (10 nm)/TPBi (40 nm)/LiF (1 nm)/Al (100 nm).

[0048] FIGS. 5A-5D are line graphs showing electroluminescent spectra and performance characteristics of devices of Cu3 with doping concentration of 2-6 wt/wt %. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: TPBi: Cu3 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm).

[0049] FIGS. 6A-6D are line graphs showing electroluminescent spectra and performance characteristics of devices of Au1 with doping concentration of 2-6 wt/wt %. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: TPBi: Au1 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm).

[0050] FIGS. 7A-7D are line graphs showing electroluminescent spectra and performance characteristics of devices of Au2 with doping concentration of 2-6 wt/wt %. Device structure(I): ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: TPBi: Au2 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm).

[0051] FIGS. 8A-8D are line graphs showing electroluminescent spectra and performance characteristics of devices of Au2 with doping concentration of 2-8 wt/wt %. Device structure (II): ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: DPEPO: Au2 (20 nm)/DPEPO (10 nm)/TPBi (40 nm)/LiF (1 nm)/Al (100 nm).

[0052] FIG. 9 is a line graph showing the emission spectra of Cu4.

[0053] FIG. 10 is a line graph showing the emission spectra of Au3.

[0054] FIG. 11 is a line graph showing the emission spectra of Cu5.

[0055] FIGS. 12A and 12B are line graphs showing the emission spectra of Cu6 and Au4.

[0056] FIGS. 13A-13C are line graphs showing device data for Cu2 in Table 5b. EL spectra and performance characteristics of devices of Cu2 with doping concentration of 2 wt/wt %. Device structure: ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu2: LLP604 (20 nm)/PT74M (5 nm)/LET321: Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm).

[0057] FIGS. 14A-14D are line graphs showing the EL spectra and performance characteristics of devices of Cu3 with doping concentration of 2-6 wt/wt %. Device structure (II): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/EB (5 nm)/Cu3: RH (40 nm)/HB (5 nm)/ZADN: Liq (35:65, 35 nm)/Liq (1 nm)/Al (100 nm).

[0058] FIGS. 15A-15D are line graphs showing the EL spectra and performance characteristics of devices of Cu4 with doping concentration of 2-6 wt/wt %. Device structure (I): ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: TPBi: Cu4 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm).

[0059] FIGS. 16A-16D are line graphs showing the EL spectra and performance characteristics of devices of Cu4 with doping concentration of 2-6 wt/wt %. Device structure (II): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu4: LLP604 (20 nm)/PT74M (5 nm)/LET321: Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm).

[0060] FIGS. 17A-17D are line graphs showing the EL spectra and performance characteristics of devices of Au2 with doping concentration of 2-8 wt/wt %. Device structure (III): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Au2: LLP604 (20 nm)/PT74M (5 nm)/LET321: Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm).

[0061] FIG. 18 is a line graph showing the emission spectra of Cu1 (in MCP film).

[0062] FIG. 19 is a line graph showing the emission spectra of Cu8 (in MCP film).

[0063] FIG. 20 is a line graph showing the emission spectra of Cu9 (in degassed toluene and MCP film).

[0064] FIG. 21 is a line graph showing the emission spectra of Au7 (2 wt/wt % in PMMA film).

[0065] FIGS. 22A-22D are line graphs showing the EL spectra and performance characteristics of devices of Cu6 in TCTA:DPEPO co-host, with doping concentration of 2-6 wt/wt %. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA: DPEPO: Cu6 (20 nm)/DPEPO (10 nm)/TPBi (40 nm)/LiF (1.2 nm)/Al (100 nm).

[0066] FIGS. 23A-23D are line graphs showing the EL spectra and performance characteristics of vapor-deposited hyper-fluorescence OLED with Cu6 and v-DABNA in mCBP. Device structure: ITO/HAT-CN (10 nm)/BPBPA (120 nm)/mCBP (10 nm)/mCBP: Cu6: v-DABNA (20 nm)/SF3-TRz (5 nm)/SF3-TRz: Liq (1:1, 25 nm)/Liq (2 nm)/Al (100 nm).

[0067] FIGS. 24A-24D are line graphs showing the EL spectra and performance characteristics of Cu7 in DMIC-Cz: DMIC-Trz co-host, with doping concentration of 2-6 wt/wt %. Device structure: ITO/HAT-CN (10 nm)/BPBOA (80 nm)/FSF4A (5 nm)/DMIC-Cz: DMIC-Trz: Cu7 (30 nm)/ANT-Biz (5 nm)/ANT-Biz: Liq (25 nm)/Liq (2 nm)/Al (100 nm).

[0068] FIGS. 25A-25D are line graphs showing the EL spectra and performance characteristics of vapor-deposited hyper-fluorescence OLED with Cu7 and MR-R in RH. Device structure: ITO/HAT-CN (10 nm)/HT (40 nm)/EB (5 nm)/Cu7: MR-R: RH (40 nm)/HB (5 nm)/ZADN: Liq (35:65) (35 nm)/Liq (2 nm)/Al (100 nm).

[0069] FIGS. 26A-26D are line graphs showing the EL spectra and performance characteristics of vapor-deposited hyper-fluorescence OLED with Au3 and BN-2 in mCBP. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/mCBP (10 nm)/Au3: BN-2: mCBP (20 nm)/PPF (10nm)/TmPyPb (40 nm)/LiF (1.2 nm)/Al (100 nm).

[0070] FIGS. 27A-27D are line graphs showing the EL spectra and performance characteristics of Au5 in mCBP:CzSiTrz co-host, with doping concentration of 2-8 wt/wt %. Device structure: ITO/HAT-CN (10 nm)/FSFA (120 nm)/mCBP (10 nm)/mCBP: CzSiTrz: Au5 (30 nm)/SF3-Trz (5 nm)/SF3-Trz: Liq (25 nm)/Liq (2 nm)/Al (100 nm).

[0071] FIG. 28 is a line graph showing the emission spectra of Au10 (in MCP film).

[0072] FIG. 29 is a line graph showing the emission spectra of Au11 (in MCP film).

DETAILED DESCRIPTION OF THE INVENTION

I. Definitions

[0073] “Alkyl” includes straight and branched chain alkyl groups, as well as cycloalkyl groups with alkyl groups having a cyclic structure. Preferred alkyl groups are those containing between one to eighteen carbon atoms and includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, and other similar compounds. In addition, the alkyl group may be optionally substituted with one or more substituents selected from hydrogen atom, deuterium atom, formaldehyde, cyano, alkylalkynyl, substituted alkylalkynyl, arylalkynyl, substituted arylalkynyl, heteroarylalkynyl, substituted heteroarylalkynyl, condensed polycyclic, substituted condensed polycyclic, aryl, alkyl, heteroaryl, nitro, trifluoromethane, cyano, arylether, alkylether, heteroarylether, diarylamine, dialkylamine, diheteroarylamine, diarylborane, triarylsilane, trialkylsilane, alkenyl, alkylaryl, cycloalkyl, haloformyl, hydroxyl, aldehyde, carboxamide, amine, amino, alkoxy, azo, benzyl, carbonate ester, carboxylate, carboxyl, ketamine, isocyanate, isocyanide, isothiocyanate, nitrile, nitro, nitroso, phosphine, phosphate, phosphono, pyridyl, sulfonyl, sulfo, sulfinyl, sulfhydryl, halo, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and derivatives thereof. It will be understood by those skilled in the art that the moieties substituted on the hydrocarbon chain can themselves be substituted, if appropriate. For instance, the substituents of a substituted alkyl may include halogen, hydroxy, nitro, thiols, amino, azido, imino, amido, phosphoryl (including phosphonate and phosphinate), sulfonyl (including sulfate, sulfonamido, sulfamoyl and sulfonate), and silyl groups, as well as ethers, alkylthios, carbonyls (including ketones, aldehydes, carboxylates, and esters), haloalkyls, —CN and the like. Cycloalkyls can be substituted in the same manner.

[0074] “Substituted,” as used herein, refers to all permissible substituents of the compounds or functional groups described herein. In the broadest sense, the permissible substituents include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and nonaromatic substituents of organic compounds. Illustrative substituents include, but are not limited to, halogens, hydroxyl groups, or any other organic groupings containing any number of carbon atoms, preferably 1-14 carbon atoms, and optionally include one or more heteroatoms such as oxygen, sulfur, or nitrogen grouping in linear, branched, or cyclic structural formats. Representative substituents include alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, phenyl, substituted phenyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, halo, hydroxyl, alkoxy, substituted alkoxy, phenoxy, substituted phenoxy, aroxy, substituted aroxy, alkylthio, substituted alkylthio, phenylthio, substituted phenylthio, arylthio, substituted arylthio, cyano, isocyano, substituted isocyano, oxo (═O), carbonyl, substituted carbonyl, carboxyl, substituted carboxyl, amino, substituted amino, amido, substituted amido, sulfonyl, substituted sulfonyl, sulfonic acid, phosphoryl, substituted phosphoryl, phosphonyl, substituted phosphonyl, polyaryl, substituted polyaryl, cyclic (such as C.sub.3-C.sub.20 cyclic), substituted cyclic (such as substituted C.sub.3-C.sub.20 cyclic), heterocyclic, substituted heterocyclic, amino acid, poly(lactic-co-glycolic acid), peptide, polypeptide, deuterium, unsubstituted alkylalkynyl, substituted alkylalkynyl, unsubstituted arylalkynyl, substituted arylalkynyl, unsubstituted heteroarylalkynyl, substituted heteroarylalkynyl, trihaloalkyl (trifluoromethyl), unsubstituted heteroarylether, substituted heteroarylether, unsubstituted diarylamino, substituted diarylamino, unsubstituted dialkylamino, substituted dialkylamino, unsubstituted diheteroarylamino, substituted diheteroarylamino, unsubstituted diarylboraneyl, substituted diarylboraneyl, unsubstituted triarylsilyl, substituted triarylsilyl, unsubstituted trialkylsilyl, substituted trialkylsilyl, azo, carbonate ester, ketamine, nitro, nitroso, phosphino, pyridyl, NRR′, SR, C(O)R, COOR, C(O)NR, SOR, and BRR' groups, wherein and R and R′ are independently selected from hydrogen atom, deuterium atom, formaldehyde, cyano, alkylalkynyl, substituted alkylalkynyl, arylalkynyl, substituted arylalkynyl, heteroarylalkynyl, substituted heteroarylalkynyl, condensed polycyclic, substituted condensed polycyclic, aryl, alkyl, heteroaryl, nitro, trifluoromethane, cyano, arylether, alkylether, heteroarylether, diarylamine, dialkylamine, diheteroarylamine, diarylborane, triarylsilane, trialkylsilane, alkenyl, alkylaryl, cycloalkyl, haloformyl, hydroxyl, aldehyde, carboxamide, amine, amino, alkoxy, azo, benzyl, carbonate ester, carboxylate, carboxyl, ketamine, isocyanate, isocyanide, isothiocyanate, nitrile, nitro, nitroso, phosphine, phosphate, phosphono, pyridyl, sulfonyl, sulfo, sulfinyl, sulfhydryl, halo, aryl, substituted aryl, heteroaryl, substituted heteroaryl, and heterocyclic groups. Such alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, phenyl, substituted phenyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, halo, hydroxyl, alkoxy, substituted alkoxy, phenoxy, substituted phenoxy, aroxy, substituted aroxy, alkylthio, substituted alkylthio, phenylthio, substituted phenylthio, arylthio, substituted arylthio, cyano, isocyano, substituted isocyano, carbonyl, substituted carbonyl, carboxyl, substituted carboxyl, amino, substituted amino, amido, substituted amido, sulfonyl, substituted sulfonyl, sulfonic acid, phosphoryl, substituted phosphoryl, phosphonyl, substituted phosphonyl, polyaryl, substituted polyaryl, cyclic (such as C.sub.3-C.sub.20 cyclic), substituted cyclic (such as substituted C.sub.3-C.sub.20 cyclic), heterocyclic, substituted heterocyclic, amino acid, poly(lactic-co-glycolic acid), peptide, polypeptide, deuterium, substituted alkylalkynyl, substituted alkylalkynyl, unsubstituted arylalkynyl, substituted arylalkynyl, unsubstituted heteroarylalkynyl, substituted heteroarylalkynyl, trihaloalkyl (trifluoromethyl), unsubstituted heteroarylether, substituted heteroarylether, unsubstituted diarylamino, substituted diarylamino, unsubstituted dialkylamino, substituted dialkylamino, unsubstituted diheteroarylamino, substituted diheteroarylamino, unsubstituted diarylboraneyl, substituted diarylboraneyl, unsubstituted triarylsilyl, substituted triarylsilyl, unsubstituted trialkylsilyl, substituted trialkylsilyl, azo, carbonate ester, ketamine, nitro, nitroso, phosphide, phosphino, and pyridyl groups can be further substituted.

[0075] The term “heteroatom” as used herein includes, but is not limited to, S, O, N, P, Se, Te, As, Sb, Bi, B, Si, Ge, Sn and Pb. Heteroatoms such as nitrogen may have hydrogen substituents and/or any permissible substituents of organic compounds described herein which satisfy the valences of the heteroatoms. It is understood that “substitution” or “substituted” includes the implicit proviso that such substitution is in accordance with permitted valence of the substituted atom and the substituent, and that the substitution results in a stable compound, i.e. a compound that does not spontaneously undergo transformation such as by rearrangement, cyclization, elimination, etc.

[0076] The term “alkenyl” as used herein is a hydrocarbon group having, for example, from 2 to 24 carbon atoms and a structural formula containing at least one carbon-carbon double bond. Asymmetric structures such as (AB)C=C(CD) are intended to include both the E and Z isomers. This may be presumed in structural formulae herein wherein an asymmetric alkene is present, or it may be explicitly indicated by the bond symbol C.

[0077] The term “alkynyl group” as used herein is a hydrocarbon group having, for example, 2 to 24 carbon atoms and a structural formula containing at least one carbon-carbon triple bond.

[0078] The term “aryl” as used herein is any C.sub.5-C.sub.26 carbon-based aromatic group, fused aromatic, fused heterocyclic, or biaromatic ring systems. Broadly defined, “aryl,” as used herein, includes 5-, 6-, 7-, 8-, 9-, 10-, 14-, 18-, and 24-membered single-ring aromatic groups, including, but not limited to, benzene, naphthalene, anthracene, phenanthrene, chrysene, pyrene, corannulene, coronene, etc. “Aryl” further encompasses polycyclic ring systems having two or more cyclic rings in which two or more carbons are common to two adjoining rings (i.e., “fused rings”) wherein at least one of the rings is aromatic, e.g., the other cyclic ring or rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls and/or heterocycles. The aryl group can be substituted with one or more groups including, but not limited to, alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ketone, aldehyde, hydroxy, carboxylic acid, or alkoxy.

[0079] The term “substituted aryl” refers to an aryl group, wherein one or more hydrogen atoms on one or more aromatic rings are substituted with one or more substituents including, but not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, alkoxy, carbonyl (such as a ketone, aldehyde, carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, imino, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl (such as CF3, —CH.sub.2-CF.sub.3, —CCl.sub.3), —CN, aryl, heteroaryl, and combinations thereof.

[0080] “Heterocycle,” “heterocyclic” and “heterocyclyl” are used interchangeably, and refer to a cyclic radical attached via a ring carbon or nitrogen atom of a monocyclic, bicyclic, or tricyclic ring containing 3-14 ring atoms, and preferably from 5-6 ring atoms, consisting of carbon and one to four heteroatoms each selected from the group consisting of non-peroxide oxygen, sulfur, and N(Y) wherein Y is absent or is H, O, C.sub.1-C.sub.10 alkyl, phenyl or benzyl, and optionally containing 1-3 double bonds and optionally substituted with one or more substituents. Heterocyclyl are distinguished from heteroaryl by definition. Examples of heterocycles include, but are not limited to piperazinyl, piperidinyl, piperidonyl, 4-piperidonyl, dihydrofuro[2,3-b]tetrahydrofuran, morpholinyl, piperazinyl, piperidinyl, piperidonyl, 4-piperidonyl, piperonyl, pyranyl, 2H-pyrrolyl, 4H-quinolizinyl, quinuclidinyl, tetrahydrofuranyl, 6H-1,2,5-thiadiazinyl. Heterocyclic groups can optionally be substituted with one or more substituents as defined above for alkyl and aryl.

[0081] The term “heteroaryl” refers to C.sub.5-C.sub.26-membered aromatic, fused aromatic, biaromatic ring systems, or combinations thereof, in which one or more carbon atoms on one or more aromatic ring structures have been substituted with a heteroatom. Suitable heteroatoms include, but are not limited to, oxygen, sulfur, and nitrogen. Broadly defined, “heteroaryl,” as used herein, includes 5-, 6-, 7-, 8-, 9-, 10-, 14-, 18-, and 24-membered single-ring aromatic groups that may include from one to four heteroatoms, for example, pyrrole, furan, thiophene, imidazole, oxazole, thiazole, triazole, tetrazole, pyrazole, pyridine, pyrazine, pyridazine and pyrimidine, and the like. The heteroaryl group may also be referred to as “aryl heterocycles” or “heteroaromatics.” “Heteroaryl” further encompasses polycyclic ring systems having two or more rings in which two or more carbons are common to two adjoining rings (i.e., “fused rings”) wherein at least one of the rings is heteroaromatic, e.g., the other cyclic ring or rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heterocycles, or combinations thereof. Examples of heteroaryl rings include, but are not limited to, benzimidazolyl, benzofuranyl, benzothiofuranyl, benzothiophenyl, benzoxazolyl, benzoxazolinyl, benzthiazolyl, benztriazolyl, benztetrazolyl, benzisoxazolyl, benzisothiazolyl, benzimidazolinyl, carbazolyl, 4aH-carbazolyl, carbolinyl, chromanyl, chromenyl, cinnolinyl, decahydroquinolinyl, 2H,6H-1,5,2-dithiazinyl, furanyl, furazanyl, imidazolidinyl, imidazolinyl, imidazolyl, 1H-indazolyl, indolenyl, indolinyl, indolizinyl, indolyl, 3H-indolyl, isatinoyl, isobenzofuranyl, isochromanyl, isoindazolyl, isoindolinyl, isoindolyl, isoquinolinyl, isothiazolyl, isoxazolyl, methylenedioxyphenyl, naphthyridinyl, octahydroisoquinolinyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, oxazolidinyl, oxazolyl, oxindolyl, pyrimidinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phenothiazinyl, phenoxathinyl, phenoxazinyl, phthalazinyl, pteridinyl, purinyl, pyrazinyl, pyrazolidinyl, pyrazolinyl, pyrazolyl, pyridazinyl, pyridooxazole, pyridoimidazole, pyridothiazole, pyridinyl, pyridyl, pyrimidinyl, pyrrolidinyl, pyrrolinyl, pyrrolyl, quinazolinyl, quinolinyl, quinoxalinyl, tetrahydroisoquinolinyl, tetrahydroquinolinyl, tetrazolyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, thianthrenyl, thiazolyl, thienyl, thienothiazolyl, thienooxazolyl, thienoimidazolyl, thiophenyl and xanthenyl. One or more of the rings can be substituted as defined below for “substituted heteroaryl”.

[0082] The term “substituted heteroaryl” refers to a heteroaryl group in which one or more hydrogen atoms on one or more heteroaromatic rings are substituted with one or more substituents including, but not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, alkoxy, carbonyl (such as a ketone, aldehyde, carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, imino, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl (such as CF3, —CH.sub.2-CF.sub.3, —CCl.sub.3), —CN, aryl, heteroaryl, and combinations thereof.

[0083] The term “substituted alkenyl” refers to alkenyl moieties having one or more substituents replacing one or more hydrogen atoms on one or more carbons of the hydrocarbon backbone. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0084] The term “substituted alkynyl” refers to alkynyl moieties having one or more substituents replacing one or more hydrogen atoms on one or more carbons of the hydrocarbon backbone. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0085] The term “cycloalkyl” as used herein is a non-aromatic carbon-based ring composed of at least three carbon atoms. Examples of cycloalkyl groups include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. The term “heterocycloalkyl group” is a cycloalkyl group as defined above where at least one of the carbon atoms of the ring is substituted with a heteroatom such as, but not limited to, nitrogen, oxygen, sulphur, or phosphorus.

[0086] The term “aralkyl” as used herein is an aryl group having an alkyl, alkynyl, or alkenyl group as defined above attached to the aromatic group. An example of an aralkyl group is a benzyl group.

[0087] “Carbonyl,” as used herein, is art-recognized and includes such moieties as can be represented by the general formula:

##STR00006##

wherein X is a bond, or represents an oxygen or a sulfur, and R represents a hydrogen, a substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R″, or a pharmaceutical acceptable salt, R′ represents a hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl or —(CH2).sub.mR″; R″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8. Where X is oxygen and R is defined as above, the moiety is also referred to as a carboxyl group. When X is oxygen and R is hydrogen, the formula represents a ‘carboxylic acid’. Where X is oxygen and R′ is hydrogen, the formula represents a ‘formate’. Where X is oxygen and R or R′ is not hydrogen, the formula represents an “ester”. In general, where the oxygen atom of the above formula is replaced by a sulfur atom, the formula represents a ‘thiocarbonyl’ group. Where X is sulfur and R or R′ is not hydrogen, the formula represents a ‘thioester.’ Where X is sulfur and R is hydrogen, the formula represents a ‘thiocarboxylic acid.’ Where X is sulfur and R′ is hydrogen, the formula represents a ‘thioformate.’ Where X is a bond and R is not hydrogen, the above formula represents a ‘ketone.’ Where X is a bond and R is hydrogen, the above formula represents an ‘aldehyde.’

[0088] The term “substituted carbonyl” refers to a carbonyl, as defined above, wherein one or more hydrogen atoms in R, R′ or a group to which the moiety

##STR00007##

is attached, are independently substituted. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0089] The term “carboxyl” is as defined above for the formula

##STR00008##

and is defined more specifically by the formula —R.sup.ivCOOH, wherein R.sup.iv is an alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, alkylaryl, arylalkyl, aryl, or heteroaryl. In preferred forms, a straight chain or branched chain alkyl, alkenyl, and alkynyl have 30 or fewer carbon atoms in its backbone (e.g., C.sub.1-C.sub.30 for straight chain alkyl, C.sub.3-C.sub.30 for branched chain alkyl, C.sub.2-C.sub.30 for straight chain alkenyl and alkynyl, C.sub.3-C.sub.30 for branched chain alkenyl and alkynyl), preferably 20 or fewer, more preferably 15 or fewer, most preferably 10 or fewer.

[0090] Likewise, preferred cycloalkyls, heterocyclyls, aryls and heteroaryls have from 3-10 carbon atoms in their ring structure, and more preferably have 5, 6 or 7 carbons in the ring structure.

[0091] The term “substituted carboxyl” refers to a carboxyl, as defined above, wherein one or more hydrogen atoms in R.sup.iv are substituted. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0092] The term “phenoxy” is recognized, and refers to a compound of the formula —ORv wherein R.sub.v is (i.e., —O—C.sub.6H.sub.5). One of skill in the art recognizes that a phenoxy is a species of the aroxy genus.

[0093] The term “substituted phenoxy” refers to a phenoxy group, as defined above, having one or more substituents replacing one or more hydrogen atoms on one or more carbons of the phenyl ring. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0094] The terms “aroxy” and “aryloxy,” as used interchangeably herein, are represented by —O-aryl or —O-heteroaryl, wherein aryl and heteroaryl are as defined herein.

[0095] The terms “substituted aroxy” and “substituted aryloxy,” as used interchangeably herein, represent −O-aryl or —O-heteroaryl, having one or more substituents replacing one or more hydrogen atoms on one or more ring atoms of the aryl and heteroaryl, as defined herein. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0096] The term “alkylthio” refers to an alkyl group, as defined above, having a sulfur radical attached thereto. The “alkylthio” moiety is represented by —S-alkyl. Representative alkylthio groups include methylthio, ethylthio, and the like. The term “alkylthio” also encompasses cycloalkyl groups having a sulfur radical attached thereto.

[0097] The term “substituted alkylthio” refers to an alkylthio group having one or more substituents replacing one or more hydrogen atoms on one or more carbon atoms of the alkylthio backbone. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0098] The term “phenylthio” is art recognized, and refers to —S—C.sub.6H.sub.5, i.e., a phenyl group attached to a sulfur atom.

[0099] The term “substituted phenylthio” refers to a phenylthio group, as defined above, having one or more substituents replacing a hydrogen on one or more carbons of the phenyl ring. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0100] “Arylthio” refers to —S-aryl or —S-heteroaryl groups, wherein aryl and heteroaryl as defined herein.

[0101] The term “substituted arylthio” represents —S-aryl or —S-heteroaryl, having one or more substituents replacing a hydrogen atom on one or more ring atoms of the aryl and heteroaryl rings as defined herein. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0102] The terms “amide” or “amido” are used interchangeably, refer to both “unsubstituted amido” and “substituted amido” and are represented by the general formula:

##STR00009##

wherein, E is absent, or E is substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aralkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted heterocyclyl, wherein independently of E, R and R′ each independently represent a hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted carbonyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R′″, or R and R′ taken together with the N atom to which they are attached complete a heterocycle having from 3 to 14 atoms in the ring structure; R′″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8. In preferred forms, only one of R and R′ can be a carbonyl, e.g., R and R′ together with the nitrogen do not form an imide. In preferred forms, R and R′ each independently represent a hydrogen atom, substituted or unsubstituted alkyl, a substituted or unsubstituted alkenyl, or —(CH.sub.2).sub.m—R′″. When E is oxygen, a carbamate is formed. The carbamate cannot be attached to another chemical species, such as to form an oxygen-oxygen bond, or other unstable bonds, as understood by one of ordinary skill in the art.

[0103] The term “sulfonyl” is represented by the formula

##STR00010##

wherein E is absent, or E is alkyl, alkenyl, alkynyl, aralkyl, alkylaryl, cycloalkyl, aryl, heteroaryl, heterocyclyl, wherein independently of E, R represents a hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted amine, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R′″, or E and R taken together with the S atom to which they are attached complete a heterocycle having from 3 to 14 atoms in the ring structure; R′″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8. In preferred forms, only one of E and R can be substituted or unsubstituted amine, to form a “sulfonamide” or “sulfonamido.” The substituted or unsubstituted amine is as defined above.

[0104] The term “substituted sulfonyl” represents a sulfonyl in which E, R, or both, are independently substituted. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0105] The term “sulfonic acid” refers to a sulfonyl, as defined above, wherein R is hydroxyl, and E is absent, or E is substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl.

[0106] The term “sulfate” refers to a sulfonyl, as defined above, wherein E is absent, oxygen, alkoxy, aroxy, substituted alkoxy or substituted aroxy, as defined above, and R is independently hydroxyl, alkoxy, aroxy, substituted alkoxy or substituted aroxy, as defined above. When E is oxygen, the sulfate cannot be attached to another chemical species, such as to form an oxygen-oxygen bond, or other unstable bonds, as understood by one of ordinary skill in the art.

[0107] The term “sulfonate” refers to a sulfonyl, as defined above, wherein E is oxygen, alkoxy, aroxy, substituted alkoxy or substituted aroxy, as defined above, and R is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted amine, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R′″, R′″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8. When E is oxygen, sulfonate cannot be attached to another chemical species, such as to form an oxygen-oxygen bond, or other unstable bonds, as understood by one of ordinary skill in the art.

[0108] The term “sulfamoyl” refers to a sulfonamide or sulfonamide represented by the formula

##STR00011##

wherein E is absent, or E is substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aralkyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted heterocyclyl, wherein independently of E, R and R′ each independently represent a hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted carbonyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R′″, or R and R′ taken together with the N atom to which they are attached complete a heterocycle having from 3 to 14 atoms in the ring structure; R′″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8. In preferred forms, only one of R and R′ can be a carbonyl, e.g., R and R′ together with the nitrogen do not form an imide.

[0109] The term “phosphonyl” is represented by the formula

##STR00012##

wherein E is absent, or E is substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aralkyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted heterocyclyl, wherein, independently of E, Rv.sup.iv and R.sup.vii are independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted carbonyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkylaryl, substituted or unsubstituted arylalkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl, —(CH.sub.2).sub.m—R′″, or R and R′ taken together with the P atom to which they are attached complete a heterocycle having from 3 to 14 atoms in the ring structure; R′″ represents a hydroxy group, substituted or unsubstituted carbonyl group, an aryl, a cycloalkyl ring, a cycloalkenyl ring, a heterocycle, or a polycycle; and m is zero or an integer ranging from 1 to 8.

[0110] The term “substituted phosphonyl” represents a phosphonyl in which E, R.sup.vi and R.sup.vii are independently substituted. Such substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0111] The term “phosphoryl” defines a phosphonyl in which E is absent, oxygen, alkoxy, aroxy, substituted alkoxy or substituted aroxy, as defined above, and independently of E, R.sup.vi and R.sup.vii are independently hydroxyl, alkoxy, aroxy, substituted alkoxy or substituted aroxy, as defined above. When E is oxygen, the phosphoryl cannot be attached to another chemical species, such as to form an oxygen-oxygen bond, or other unstable bonds, as understood by one of ordinary skill in the art. When E, R.sup.vi and R.sup.vii are substituted, the substituents include, but are not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof.

[0112] The term “polyaryl” refers to a chemical moiety that includes two or more aryls, heteroaryls, and combinations thereof. The aryls, heteroaryls, and combinations thereof, are fused, or linked via a single bond, ether, ester, carbonyl, amide, sulfonyl, sulfonamide, alkyl, azo, and combinations thereof. When two or more heteroaryls are involved, the chemical moiety can be referred to as a “polyheteroaryl.”

[0113] The term “substituted polyaryl” refers to a polyaryl in which one or more of the aryls, heteroaryls are substituted, with one or more substituents including, but not limited to, halogen, azide, alkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, hydroxyl, carbonyl (such as a carboxyl, alkoxycarbonyl, formyl, or an acyl), silyl, ether, ester, thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), alkoxyl, phosphoryl, phosphate, phosphonate, phosphinate, amino (or quarternized amino), amido, amidine, imine, cyano, nitro, azido, sulfhydryl, alkylthio, sulfate, sulfonate, sulfamoyl, sulfonamido, sulfonyl, heterocyclyl, alkylaryl, haloalkyl, —CN, aryl, heteroaryl, and combinations thereof. When two or more heteroaryls are involved, the chemical moiety can be referred to as a “substituted polyheteroaryl.”

[0114] The term “cyclic” refers to a substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted cycloalkynyl, substituted or unsubstituted heterocyclyl that, preferably, have from 3 to 20 carbon atoms, as geometric constraints permit. The cyclic structures are formed from single or fused ring systems. The substituted cycloalkyls, cycloalkenyls, cycloalkynyls and heterocyclyls are substituted as defined above for the alkyls, alkenyls, alkynyls and heterocyclyls, respectively.

II. Compositions

[0115] Described are two-coordinated d10 metal carbene complexes containing an imidazopyrazine ligand (e.g., pyrazine-fused N-heterocyclic carbene (NHC) ligand), an imidazopyridine ligand (e.g. pyridine-fused NHC), or a pyrrolopyrazine (e.g. pyrazine-fused NHC) ligand. The radiative properties of the compounds can be controlled by TADF. Preferably, the d10 metal carbene complexes contain a d10 metal in the +1-oxidation state (such as Cu(I), Ag(I), or Au(I)), a pyrazine-fused NHC ligand, and a carbazole ligand. A preferred pyrazine-fused NHC ligand or pyridine-fused N-heterocyclic carbene ligand contains a 2,6-diisopropylphenyl group covalently bonded to the nitrogen atoms of the imidazole moiety of the pyrazine-fused NHC ligand. The described compounds (i) are easy to produce in large scale, (ii) can be cheaper to produce because of the earth-abundant metal (copper), (iii) show tunable color emission properties, such as from blue-green to orange-red, (iv) are sublimable and solution-processable for OLED fabrication, (v) show improved OLED brightness and efficiency compared to existing emitters, and/or (vi) show improved device stability compared to reported d10 Cu/Ag/Au emitters.

[0116] The disclosed compounds have a structure:

##STR00013##

wherein:

[0117] the compound has an overall neutral, negative, or positive charge,

[0118] M is copper, silver, or gold with an oxidation state of 0, +1, +2, or +3, preferably +1,

[0119] P′ has the structure:

##STR00014##

[0120] D is carbon,

[0121] T, J, and W are independently carbon or nitrogen, wherein at least one of T, J, and W is nitrogen, wherein when T is carbon, J is nitrogen, or when T is nitrogen, J is carbon, and T, J, and W are bonded to one or no hydrogen atom according to valency,

[0122] X and Y are independently carbon or nitrogen, wherein at least one of X and Y is nitrogen, and X and Y are bonded to one or no hydrogen atom according to valency,

[0123] R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or R.sub.1, J, D, and R.sub.2 together form an unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl,

[0124] R.sub.3 and R.sub.4 are independently hydrogen, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl,

[0125] R.sub.3′ and R.sub.4′ are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, and

[0126] Z is substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted polyheterocyclyl, unsubstituted polyheterocyclyl, substituted heterocyclyl, or unsubstituted heterocyclyl, or —NR.sub.aR.sub.b, wherein R.sub.a and R.sub.b are independently hydrogen, substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted heterocyclyl, unsubstituted heterocyclyl, substituted alkyl, or unsubstituted alkyl,

[0127] wherein (i) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted aryl, (ii) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted phenyl, (iii) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl, (iv) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl when M is Cu or Au, or (v) the compound is not

##STR00015##

[0128] In some forms, the compound is as described above for Formula I, except that the compound has a structure:

##STR00016##

wherein CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, unsubstituted polyaryl, substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl. In some forms, CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, or unsubstituted polyaryl. In some forms, CY1 and CY2 are substituted aryl.

[0129] In some forms, the compound is a described above for Formula I or II, except that R.sub.3′ and R.sub.4′ are absent.

[0130] In some forms, the compound is as described above for Formula I or II, except that the compound has a structure:

##STR00017##

wherein:

[0131] R.sub.5 and R.sub.6 are independently substituted alkyl or unsubstituted alkyl, and

[0132] n1 and n2 are independently integers between 0 and 5; between 1 and 5; between 2 and 5, such as 2; or between 3 and 5, such as 3.

[0133] In some forms, the compound is as described above for any of Formula I-III, except that the compound has a structure:

##STR00018##

wherein:

[0134] n1 and n2 are independently integers between 1 and 5, between 2 and 5, or between 3 and 5,

[0135] L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and

[0136] CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or a fused combination thereof.

[0137] In some forms, the compound is as described above for any of Formula I-IV, except that the compound has a structure:

##STR00019##

wherein:

[0138] each Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl,

[0139] each Rb is independently unsubstituted alkyl, or substituted alkyl, L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and optionally wherein at least one of X and Y is nitrogen. In some forms, X and Y are nitrogen.

[0140] In some forms, the compound is as described above for any of Formula I-V, except that:

[0141] (i) T is nitrogen, J is carbon, and W is carbon,

[0142] (ii) T is nitrogen, J is carbon, and W is nitrogen,

[0143] (iii) T is carbon, J is nitrogen, and W is carbon, or

[0144] (iv) T is carbon, J is nitrogen, and W is nitrogen.

[0145] In some forms, the compound is as described above for Formula V, except that Ra is hydrogen, unsubstituted alkyl, or substituted alkyl, and Rb is unsubstituted alkyl or substituted alkyl.

[0146] In some forms, the compound is as described above for any of Formula I-V, except that P′ is selected from:

##STR00020##

wherein:

[0147] Ra is hydrogen, unsubstituted alkyl, or substituted alkyl, and Rb is unsubstituted alkyl or substituted alkyl.

[0148] In some forms, the compound is as described above for any of Formula I-V, wherein when specified Ra is hydrogen, methyl, iso-propyl, or —CH(C.sub.2H.sub.5).sub.2, and Rb is methyl, iso-propyl, or —CH(C.sub.2H.sub.5).sub.2.

[0149] In some forms, the compound is as described above for Formula IV or V, except that CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, unsubstituted heteroaryl, or substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof. In some forms, CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

[0150] In some forms, the compound is as described above for any of Formula I-V, except that Z has a structure:

##STR00021##

wherein:

[0151] X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, and X.sub.8 are independently carbon or nitrogen,

[0152] Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, cyano, unsubstituted alkyl, substituted alkyl, unsubstituted alkoxy, substituted alkoxy, unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl, wherein each Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, or Rx.sub.8 is absent, when the corresponding X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, or X.sub.8 is nitrogen, or Rx.sub.4 is a bond connected to a substituent on L, or adjacent Rxn groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, wherein the n in the adjacent Rxn groups are sequential pairs of integers from 1 to 4, or 5 to 8, and

[0153] L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl.

[0154] In some forms, the compound is as described above for any of Formula I-V, except that Z has a structure:

##STR00022##

[0155] wherein:

[0156] L′ is substituted aryl, unsubstituted aryl, substituted heteroaryl, or unsubstituted heteroaryl, preferably substituted aryl or unsubstituted aryl, preferably substituted phenyl or unsubstituted phenyl.

[0157] In some forms, the compound is as described above for any of Formula I-V, except that Z has a structure:

##STR00023##

[0158] wherein:

[0159] X.sub.1, X.sub.2,X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, and X.sub.8 are independently carbon or nitrogen, and

[0160] Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, cyano, unsubstituted alkyl, substituted alkyl, unsubstituted alkoxy, substituted alkoxy, unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl, wherein each Rx.sub.1, Rx.sub.2,Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, or Rx.sub.8 is absent, when the corresponding X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, or X.sub.8 is nitrogen, or adjacent Rxn groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, wherein the n in the adjacent Rxn groups are sequential pairs of integers from 1 to 4, or 5 to 8.

[0161] In some forms, the compound is as described above for any of Formula I to V, wherein when specified Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, methyl, cyano, trifluoromethyl, tert-butyl, methoxy, phenyl, or pyridyl.

[0162] In some forms, the compound is as described above for any of Formula I-V, except that the compound has a structure:

##STR00024##

preferably

##STR00025##

wherein:

[0163] V″ is carbon,

[0164] U is carbon and V is nitrogen, or U is nitrogen and V is carbon, wherein U, V, and V″ are bonded to one or no hydrogen atom according to valency,

[0165] Ra is hydrogen, unsubstituted alkyl, or substituted alkyl,

[0166] R.sub.7 and R.sub.8 are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, cyano, halogen, hydroxyl, thiol, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, substituted aryl, unsubstituted aryl, or adjacent R.sub.7 groups or adjacent R.sub.8 groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, and

[0167] n3 and n4 are independently integers between 0 and 5, such as 0, 1, 2, 3, 4, 5.

[0168] In some forms, the compound is as described above for Formula VI, except that the compound has a structure:

##STR00026##

preferably

##STR00027##

[0169] wherein:

[0170] Rv is absent, hydrogen, substituted alkyl, or unsubstituted alkyl, and

[0171] R.sub.7 and R.sub.8 are independently hydrogen, substituted alkyl, unsubstituted alkyl, unsubstituted aryl, halogen, cyano, or Rv and R.sub.7 together with the atoms in the rings to which they are bonded form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

[0172] In some forms, the compound is as described above for Formula VI or VII, except that:

[0173] Rv is absent or hydrogen, R.sub.7 and R.sub.8 are independently hydrogen, iso-propyl, tert-butyl, phenyl, fluorine, or cyano, or

[0174] Rv and R.sub.7 together form

##STR00028##

[0175] In some forms, the compound is as described above for any of Formula I-VII, except that R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, or R.sub.1 and R.sub.2 with the atoms in the ring to which they are bonded together form unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl. In some forms, R.sub.1 and R.sub.2 are hydrogen. In some forms, R.sub.1 and R.sub.2 together form the structure:

##STR00029##

[0176] In some forms, the compound is as described above for any of Formula I-VII, except that the compound has a structure:

##STR00030##

preferably

##STR00031##

wherein:

[0177] (i) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0178] (ii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=CN;

[0179] (iii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0180] (iv) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=phenyl;

[0181] (v) M=Cu(I); W=N; Ra=H; U=CH; V=N; V″=carbon; Rv=absent; R.sub.7=R.sub.8=H;

[0182] (vi) M=Cu(I); W=U=CH; V=V″=carbon; Rv=H; Ra=iso-propyl; R.sub.7=R.sub.8=H;

[0183] (vii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00032##

[0184] (viii) M=Cu(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00033##

[0185] (ix) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0186] (x) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F;

[0187] (xi) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=methyl;

[0188] (xii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H;

[0189] (xiii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=H, R.sub.8=CN;

[0190] (xiv) M=Au(I); W=N; Ra=H; U=N; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H;

[0191] (xv) M=Au(I); W=U=CH; V=carbon; Rv=H; ; Ra=iso-propyl; V″=carbon; R.sub.7=R.sub.8=H;

[0192] (xvi) M=Au(I); W=N; Ra=H; U=CH; V=N; Rv=absent; V″=carbon; R.sub.7=R.sub.8=H;

[0193] (xvii) M=Au(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=CN;

[0194] (xviii) M=Au(I); W=N; Ra=hydrogen; U=CH; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00034##

[0195] (xix) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0196] (xx) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F;

[0197] (xxi) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0198] (xxii) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0199] (xxiii) M=Ag(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0200] for (i), (ii), (iii), (iv), (v), (vi), (vii), (viii), (xii), (xiii), (xiv), (xv), (xvi), (xvii), (xviii), (xix), (xx), and (xxiii), the dashed lines denote the absence of bonds, and

[0201] for (ix), (x), (xi), (xxi), and (xxii), the dashed lines denote the presence of bonds.

[0202] In some forms, the compound has a structure selected from:

##STR00035## ##STR00036## ##STR00037## ##STR00038## ##STR00039## ##STR00040## ##STR00041##

[0203] wherein M=Cu(I), Au(I), or Ag(I).

[0204] In some forms, the compound is as described above for any of Formula I-VII, except that substituted means substituted with one or more substituents selected from: halogen, hydroxyl, thiol, nitro-, unsubstituted alkyl, unsubstituted alkenyl, unsubstituted alkynyl, unsubstituted aryl, unsubstituted heteroaryl, unsubstituted arylalkyl, unsubstituted alkoxy, unsubstituted aroxy, unsubstituted alkylthio, unsubstituted arylthio, cyano, isocyano, unsubstituted carbonyl, unsubstituted carboxyl, oxo (═O), unsubstituted amino, unsubstituted amido, unsubstituted sulfonyl, unsubstituted sulfonic acid, unsubstituted phosphoryl, unsubstituted phosphonyl, unsubstituted polyaryl, or unsubstituted C.sub.3-C.sub.20 cycloalkyl, and unsubstituted heterocyclyl.

[0205] In some forms, the compounds have a photoluminescence quantum yield (PLQY) between 0.50 and 0.95, such as between 0.58 and 0.92 in thin films. In some forms, the compounds have an emission decay lifetime (τ) between 0.20 μs and 0.45 μs, such as between 0.23 μs and 42 μs, in thin films. In some forms, the compounds have a PLQY between 0.50 and 0.95, such as between 0.58 and 0.92, and an emission decay lifetime (τ) between 0.20 μs and 0.45 μs, such as between 0.23 μs and 42 μs, in thin films. In some forms, the compounds have a radiative rate constant between 10-35×10.sup.5 s.sup.−1, such as between 15-21×10.sup.5 s.sup.−1, or ˜29×10.sup.5 s.sup.−1, in thin films. The films can also contain organic compounds. Exemplary organic compounds include, but are not limited to, host materials such as 1,3-bis(N-carbazolyl)benzene (mCP), 2,8-bis(diphenylphosphoryl)dibenzo[b,d]furan (PPF), bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO), 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl (mCBP), poly(methyl methacrylate) (PMMA), polystyrene (PS), or a combination thereof.

[0206] In some forms, the compounds act as sensitizers to transfer energy (such as exciton energy or photon energy) to a pure organic emitter. In some forms, the compounds act as sensitizers to transfer energy (such as exciton energy or photon energy) to a pure organic emitter that exhibits thermally activated delayed fluorescence. In some forms, the compounds act as sensitizers to transfer energy (such as exciton energy or photon energy) to a pure organic emitter that is boron-based. The phrase “pure organic emitter” as used throughout this application refers to a light-emitting organic molecule formed exclusively from main group elements of the periodic table, such that the light-emitting organic molecule does not contain a covalent bond or a dative bond to a main group metal. Notably, the phrase is not intended to define or specify a level of purity of a composition containing the light-emitting organic molecule.

[0207] Every compound within the above definition is intended to be and should be considered to be specifically disclosed herein. Further, every subgroup that can be identified within the above definition is intended to be and should be considered to be specifically disclosed herein. As a result, it is specifically contemplated that any compound or subgroup of compounds can be either specifically included for or excluded from use or included in or excluded from a list of compounds. For example, any one or more of the compounds described herein, with a structure depicted herein, or referred to in the Tables or the Examples herein can be specifically included, excluded, or combined in any combination, in a set or subgroup of such compounds. Such specific sets, subgroups, inclusions, and exclusions can be applied to any aspect of the compositions and methods described here. For example, a set of compounds that specifically excludes one or more particular compounds can be used or applied in the context of compounds per se (for example, a list or set of compounds), compositions including the compound (including, for example, pharmaceutical compositions), any one or more of the disclosed methods, or combinations of these. Different sets and subgroups of compounds with such specific inclusions and exclusions can be used or applied in the context of compounds per se, compositions including one or more of the compounds, or any of the disclosed methods. All of these different sets and subgroups of compounds—and the different sets of compounds, compositions, and methods using or applying the compounds—are specifically and individual contemplated and should be considered as specifically and individually described.

III. Methods of Making and Reagents Therefor

[0208] A. Compounds

[0209] The two-coordinated d10 metal carbene complexes and their ligands described herein can be synthesized using methods known in the art of organic chemical synthesis. The target compound can be synthesized by reacting the corresponding pyrazine-fused NHC ligand a corresponding pyrazine-fused NHC ligand precursor, or a combination thereof, with a d10 compound in a solvent or solution to form a complex precursor. Exemplary solvents include organic solvents, such as tetrahydrofuran and dichloromethane. The complex precursor can be reacted with a second ligand (e.g., a carbazole) over a suitable time to form the d10 metal carbene complex. Specific d10 metal carbene complexes, such as those containing Cu(I), Ag(I), and Au(I) are disclosed in the Examples. B. Organic light-emitting devices

[0210] Also described are methods of making organic light-emitting devices, such as OLEDs, containing one or more d10 metal carbene complexes described above for any of Formula I-VIII. A preferred method of making the OLEDs involves vacuum deposition or solution processing techniques such as spin-coating and ink printing (such as, ink-jet printing or roll-to-roll printing). A method of making an OLED including a d10 metal carbene complex described herein is disclosed in the Examples.

IV. Methods of Using

[0211] Preferably, the d10 metal carbene complexes described herein are photo-stable, and are emissive at room temperatures, low temperatures, or a combination thereof. Accordingly, the compounds described herein can be incorporated into OLEDs, an organic photovoltaic cell (OPV), and organic field-effect transistor (OFET), or a light-emitting electrochemical cell (LEEC), and used in a stationary visual display unit, a mobile visual display unit, or an illumination device. Examples of units or devices include commercial applications such as smart phones, televisions, monitors, digital cameras, tablet computers, keyboards, clothes ornaments, garment accessories, wearable devices, medical monitoring devices, wall papers, advertisement panels, laptops, household appliances, office appliances, and lighting fixtures. Preferably, these units or devices are those that usually operate at room temperatures.

[0212] In some forms, the compounds can be included in a light-emitting layer. In some forms, one or more of the compounds can be included in a light-emitting layer containing a pure organic emitter, such that the one or more compounds act as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter. In some forms, the one or more compounds have a higher-lying singlet state than the pure organic emitter. In some forms, the pure organic emitter exhibits thermally activated delayed fluorescence. In some forms, the pure organic emitter is boron-based. In some forms, the light-emitting layer can be included in an OLED.

[0213] The disclosed compounds, methods of using, and methods of making can be further understood through the following enumerated paragraphs or embodiments.

[0214] 1. A compound having a structure:

##STR00042##

wherein:

[0215] the compound has an overall neutral, negative, or positive charge,

[0216] M is copper, silver, or gold with an oxidation state of 0, +1, +2, or +3, preferably +1,

[0217] P′ has the structure:

##STR00043##

[0218] D is carbon,

[0219] T, J, and W are independently carbon or nitrogen, wherein at least one of T, J, and W is nitrogen, wherein when T is carbon, J is nitrogen, or when T is nitrogen, J is carbon, and T, J, and W are bonded to one or no hydrogen atom according to valency,

[0220] X and Y are independently carbon or nitrogen, wherein at least one of X and Y is nitrogen, and X and Y are bonded to one or no hydrogen atom according to valency,

[0221] R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or R.sub.1, J, D, and R.sub.2 together form an unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl,

[0222] R.sub.3 and R.sub.4 are independently hydrogen, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C.sub.2-C.sub.20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, R.sub.3′ and R.sub.4′ are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, halogen, hydroxyl, thiol, cyano, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted alkylthio, substituted alkylthio, unsubstituted carbonyl, substituted carbonyl, unsubstituted carboxyl, substituted carboxyl, unsubstituted ester, substituted ester, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.2-C.sub.20 heterocyclyl, unsubstituted C2.sup.−C20 heterocyclyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl, and

[0223] Z is substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted polyheterocyclyl, unsubstituted polyheterocyclyl, substituted heterocyclyl, or unsubstituted heterocyclyl, or —NR.sub.aR.sub.b, wherein R.sub.a and R.sub.b are independently hydrogen, substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted heterocyclyl, unsubstituted heterocyclyl, substituted alkyl, or unsubstituted alkyl,

[0224] wherein (i) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted aryl, (ii) R.sub.3 and R.sub.4 are not both 3,5 dialkyl substituted phenyl, (iii) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl, (iv) R.sub.3 and R.sub.4 are not both 3,5 dimethylphenyl when M is Cu or Au, or (v) the compound is not

##STR00044##

[0225] 2. The compound of paragraph 1, having a structure:

##STR00045##

wherein CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, unsubstituted polyaryl, substituted heteroaryl, unsubstituted heteroaryl, substituted polyheteroaryl, unsubstituted polyheteroaryl, substituted C.sub.3-C.sub.20 cycloalkyl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, or unsubstituted C.sub.3-C.sub.20 cycloalkynyl.

[0226] 3. The compound of paragraph 1 or 2, wherein R.sub.3′ and R.sub.4′ are absent.

[0227] 4. The compound of paragraph 2 or 3, wherein CY1 and CY2 are independently substituted aryl, unsubstituted aryl, substituted polyaryl, or unsubstituted polyaryl.

[0228] 5. The compound of any one of paragraphs 2 to 4, wherein CY1 and CY2 are substituted aryl.

[0229] 6. The compound of any one of paragraphs 1 to 5, having a structure:

##STR00046##

wherein:

[0230] R.sub.5 and R.sub.6 are independently substituted alkyl or unsubstituted alkyl, and

[0231] n1 and n2 are independently integers between 0 and 5; between 1 and 5; between 3 and 5, such as 3; or between 2 and 5; such as 2.

[0232] 7. The compound of any one of paragraphs 1 to 6, having a structure:

##STR00047##

wherein:

[0233] n1 and n2 are independently integers between 1 and 5, between 2 and 5, or between 3 and 5,

L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and

[0234] CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, substituted heteroaryl, unsubstituted polyheteroaryl, substituted polyheteroaryl, unsubstituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkyl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, substituted C.sub.3-C.sub.20 cycloalkynyl, unsubstituted C.sub.3-C.sub.20 cycloalkynyl, or a fused combination thereof.

[0235] 8. The compound of any one of paragraphs 1 to 7, having a structure:

##STR00048##

wherein:

[0236] each Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl,

[0237] each Rb is independently unsubstituted alkyl, or substituted alkyl,

[0238] L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl, and optionally wherein at least one of X and Y is nitrogen.

[0239] 9. The compound of any one of paragraphs 1 to 8, wherein:

[0240] (i) T is nitrogen, J is carbon, and W is carbon,

[0241] (ii) T is nitrogen, J is carbon, and W is nitrogen,

[0242] (iii) T is carbon, J is nitrogen, and W is carbon, or

[0243] (iv) T is carbon, J is nitrogen, and W is nitrogen.

[0244] 10. The compound of paragraph 8 or 9, wherein:

[0245] Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl, and

[0246] Rb is independently unsubstituted alkyl or substituted alkyl.

[0247] 11. The compound of any one of paragraphs 1 to 10, wherein P′ is selected from:

##STR00049##

wherein:

[0248] Ra is independently hydrogen, unsubstituted alkyl, or substituted alkyl, and

[0249] Rb is independently unsubstituted alkyl or substituted alkyl.

[0250] 12. The compound of any one of paragraphs 8 to 11, wherein:

[0251] Ra is independently hydrogen, methyl, iso-propyl, or —CH(C2H5)2, and

[0252] Rb is independently methyl, iso-propyl, or —CH(C.sub.2H.sub.5).sub.2.

[0253] 13. The compound of any one of paragraphs 7 to 12, wherein CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted polyaryl, substituted polyaryl, unsubstituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

[0254] 14. The compound of any one of paragraphs 7 to 13, wherein CY3 and CY4 are independently unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

[0255] 15. The compound of any one of paragraphs 1 to 14, wherein Z has a structure:

##STR00050##

wherein:

[0256] X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, and X.sub.8 are independently carbon or nitrogen, Rx.sub.1, Rx.sub.2,Rx.sub.3, Rx.sub.4, Rxs, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, cyano, unsubstituted alkyl, substituted alkyl, unsubstituted alkoxy, substituted alkoxy, unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl, wherein each Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rxs, Rx.sub.6, Rx.sub.7, or Rx.sub.8 is absent, when the corresponding X.sub.1, X.sub.2,X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7, or X.sub.8 is nitrogen, or Rx.sub.4 is a bond connected to a substituent on L, or adjacent Rxn groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, wherein the n in the adjacent Rxn groups are sequential pairs of integers from 1 to 4, or 5 to 8, and

[0257] L is absent, a single bond, substituted alkyl, —(CH.sub.2).sub.nx—, oxygen, sulfur, or

[0258] NRx, wherein nx is an integer between 1 and 3 (such as 1, 2, or 3), and Rx is unsubstituted alkyl, substituted alkyl, unsubstituted aryl, or substituted aryl.

[0259] 16. The compound of any one of paragraphs 1 to 15, wherein Z has a structure:

##STR00051##

[0260] wherein:

[0261] L′ is substituted aryl, unsubstituted aryl, substituted heteroaryl, or unsubstituted heteroaryl, preferably substituted aryl or unsubstituted aryl, preferably substituted phenyl or unsubstituted phenyl.

[0262] 17. The compound of paragraph 15, wherein Z has a structure:

##STR00052##

[0263] 18. The compound of paragraph 15 or 17, wherein Rx.sub.1, Rx.sub.2, Rx.sub.3, Rx.sub.4, Rx.sub.5, Rx.sub.6, Rx.sub.7, and Rx.sub.8 are independently hydrogen, halogen, methyl, cyano, trifluoromethyl, tert-butyl, methoxy, phenyl, or pyridyl.

[0264] 19. The compound of any one of paragraphs 1 to 18, wherein X and Y are nitrogen.

[0265] 20. The compound of paragraph 1, having a structure:

##STR00053##

preferably

##STR00054##

wherein:

[0266] V″ is carbon,

[0267] U is carbon and V is nitrogen, or U is nitrogen and V is carbon, wherein U, V, and V″ are bonded to one or no hydrogen atom according to valency,

[0268] Ra is hydrogen, unsubstituted alkyl, or substituted alkyl,

[0269] R.sub.7 and R.sub.8 are independently absent, hydrogen, substituted alkyl, unsubstituted alkyl, cyano, halogen, hydroxyl, thiol, nitro-, unsubstituted alkoxy, substituted alkoxy, unsubstituted aroxy, substituted aroxy, substituted aryl, unsubstituted aryl, or adjacent R.sub.7 groups or adjacent R.sub.8 groups together with the atoms in the ring to which they are bonded, together independently form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof, and

[0270] n3 and n4 are independently integers between 0 and 5, such as 0, 1, 2, 3, 4, 5.

[0271] 21. The compound of paragraph 19, having a structure:

##STR00055##

preferably

##STR00056##

wherein:

[0272] Rv is absent, hydrogen, substituted alkyl, or unsubstituted alkyl, and

[0273] R.sub.7 and R.sub.8 are independently hydrogen, substituted alkyl, unsubstituted alkyl, unsubstituted aryl, halogen, or cyano, or

[0274] Rv and R.sub.7 together with the atoms in the rings to which they are bonded form five- or six-membered substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted C.sub.3-C.sub.20 cycloalkenyl, unsubstituted C.sub.3-C.sub.20 cycloalkenyl, or a fused combination thereof.

[0275] 22. The compound of paragraph 20 or 21, wherein:

[0276] Rv is absent or hydrogen,

[0277] R.sub.7 and R.sub.8 are independently hydrogen, iso-propyl, tert-butyl, phenyl, fluorine, or cyano, or

[0278] Rv and R.sub.7 together form

##STR00057##

[0279] 23. The compound of any one of paragraphs 20 to 22, wherein:

[0280] R.sub.1 and R.sub.2 are independently hydrogen, substituted alkyl, unsubstituted alkyl, substituted alkenyl, unsubstituted alkenyl, substituted alkynyl, unsubstituted alkynyl, substituted aryl, unsubstituted aryl, or

[0281] R.sub.1 and R.sub.2 with the atoms in the ring to which they are bonded together form unsubstituted aryl, substituted aryl, unsubstituted heteroaryl, or substituted heteroaryl.

[0282] 24. The compound of any one of paragraphs 20 to 23, wherein:

[0283] R.sub.1 and R.sub.2 are hydrogen, or

[0284] R.sub.1 and R.sub.2 together form the structure:

##STR00058##

[0285] 25. The compound of paragraph 24, having a structure:

##STR00059##

preferably

##STR00060##

wherein:

[0286] (i) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0287] (ii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=CN;

[0288] (iii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0289] (iv) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=phenyl;

[0290] (v) M=Cu(I); W=N; Ra=H; U=CH; V=N; V″=carbon; Rv=absent; R.sub.7=R.sub.8=H;

[0291] (vi) M=Cu(I); W=U=CH; V=V″=carbon; Rv=H; Ra=iso-propyl; R.sub.7=R.sub.8=H;

[0292] (vii) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00061##

[0293] (viii) M=Cu(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00062##

[0294] (ix) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0295] (x) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F;

[0296] (xi) M=Cu(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=methyl;

[0297] (xii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H;

[0298] (xiii) M=Au(I); W=N; Ra=H; U=CH; V=carbon; Rv=H; V″=carbon; R.sub.7=H, R.sub.8=CN;

[0299] (xiv) M=Au(I); W=N; Ra=H; U=N; V=carbon; Rv=H; V″=carbon; R.sub.7=R.sub.8=H;

[0300] (xv) M=Au(I); W=U=CH; V=carbon; Rv=H; ; Ra=iso-propyl; V″ =carbon; R.sub.7=R.sub.8=H;

[0301] (xvi) M=Au(I); W=N; Ra=H; U=CH; V=N; Rv=absent; V″=carbon; R.sub.7=R.sub.8=H;

[0302] (xvii) M=Au(I); W=N; Ra=H; U=CH; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=CN;

[0303] (xviii) M=Au(I); W=N; Ra=hydrogen; U=CH; V=V″=carbon; R.sub.8=H; Rv and R.sub.7 together form

##STR00063##

[0304] (xix) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0305] (xx) M=Au(I); W=U=CH; Ra=iso-propyl; V=V″=carbon; Rv=H; R.sub.7=H; R.sub.8=F;

[0306] (xxi) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0307] (xxii) M=Au(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=tert-butyl;

[0308] (xxiii) M=Ag(I); W=N; U=CH; Ra=H; V=V″=carbon; Rv=H; R.sub.7=R.sub.8=H;

[0309] for (i), (ii), (iii), (iv), (v), (vi), (vii), (viii), (xii), (xiii), (xiv), (xv), (xvi), (xvii), (xviii), (xix), (xx), and (xxiii), the dashed lines denote the absence of bonds, and

[0310] for (ix), (x), (xi), (xxi), and (xxii), the dashed lines denote the presence of bonds.

[0311] 26. The compound of paragraph 1, having a structure:

##STR00064## ##STR00065## ##STR00066## ##STR00067## ##STR00068## ##STR00069## ##STR00070##

[0312] wherein M=Cu(I), Au(I), or Ag(I).

[0313] 27. The compound of any one of paragraphs 1 to 25, wherein substituted means substituted with one or more substituents selected from: halogen, hydroxyl, thiol, nitro-, unsubstituted alkyl, unsubstituted alkenyl, unsubstituted alkynyl, unsubstituted aryl, unsubstituted heteroaryl, unsubstituted arylalkyl, unsubstituted alkoxy, unsubstituted aroxy, unsubstituted alkylthio, unsubstituted arylthio, cyano, isocyano, unsubstituted carbonyl, unsubstituted carboxyl, oxo, unsubstituted amino, unsubstituted amido, unsubstituted sulfonyl, unsubstituted sulfonic acid, unsubstituted phosphoryl, unsubstituted phosphonyl, unsubstituted polyaryl, or unsubstituted C.sub.3-C.sub.20 cycloalkyl, and unsubstituted heterocyclyl.

[0314] 28. An organic electronic component containing the compound of any one of paragraphs 1 to 27.

[0315] 29. The organic electronic component of paragraph 28, wherein the organic electronic component is an organic light-emitting diode (OLED) or a light-emitting electrochemical cell (LEEC).

[0316] 30. The organic electronic component of paragraph 28 or 29, wherein the compounds are in a light-emitting layer.

[0317] 31. The organic electronic component of any one of paragraphs 28 to 30, further containing an anode, a cathode, a hole transport region, and an electron transport region,

[0318] wherein the hole transport region contains a hole injection layer and/or a hole transport layer, and optionally an electron blocking layer,

[0319] wherein the electron transport region contains an electron transport layer and/or an electron injection layer, and optionally a hole blocking layer,

[0320] wherein the light emitting layer is located in between the anode and the cathode,

[0321] wherein the hole transport region is located between the anode and the light-emitting layer, and wherein the electron transport region is located in between the cathode and the light-emitting layer.

[0322] 32. The organic electronic component of paragraph 29 or 30, wherein the light-emitting layer is fabricated by vacuum deposition, spin-coating or ink printing (such as, ink-jet printing or roll-to-roll printing).

[0323] 33. A light-emitting layer containing the compound of any one of paragraphs 1 to 27.

[0324] 34. A light-emitting layer comprising the compound of any one of paragraphs 1 to 27 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter.

[0325] 35. A light-emitting layer comprising the compound of any one of claims 1 to 27 and a pure organic emitter, wherein the compound has a higher-lying singlet state than the pure organic emitter.

[0326] 36. A light-emitting layer comprising the compound of any one of paragraphs 1 to 27 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter that exhibits thermally activated delayed fluorescence.

[0327] 37. A light-emitting layer comprising the compound of any one of paragraphs 1 to 27 and a pure organic emitter, wherein the compound acts as a sensitizer to transfer energy (such as exciton energy or photon energy) to the pure organic emitter that is boron-based.

[0328] 38. An OLED, containing the light-emitting layer of any one of paragraphs 33 to 37.

[0329] 39. A device, containing the OLED of paragraph 38, wherein the device is selected from stationary visual display units, mobile visual display units, illumination units, keyboards, clothes, ornaments, garment accessories, wearable devices, medical monitoring devices, wall papers, tablet computers, laptops, advertisement panels, panel display units, household appliances, or office appliances.

EXAMPLES

[0330] Several d10 metal (Cu(I), Ag(I) or Au(I)) carbene complexes supported by pyrazine-fused N-heterocyclic carbene (NHC) ligand and carbazole derivatives have been prepared. These complexes show efficient TADF properties with high photoluminescence quantum yield (0.58-0.92) and short emission decay lifetime (0.23-0.42 μs) in a 1,3-bis(N-carbazolyl)benzene (mCP) thin film. The radiative decay rate constants of these complexes are impressively high, with k.sub.r of 15-21×10.sup.5 s.sup.−1 for Cu(I) complexes and k.sub.r of ˜29×10.sup.5 s.sup.−1 for Au(I) complexes. Both are higher than those of the previously reported Cu(I) (k.sub.r: 0.38-10×10.sup.5 s.sup.−1) and Au(I) (0.53-22×10.sup.5 s.sup.−1) counterparts supported by cyclic (alkyl)(amino)carbene (CAAC)(Nature Communications 2020, 11, 1758; Chem. Sci. 2020, 11, 435), monoamido-aminocarbene (MAC*)(J. Am. Chem. Soc. 2019, 141, 3576-3588) or diamidocarbene (DAC*)(J. Am. Chem. Soc. 2019, 141, 3576-3588).

[0331] It is believed that what the improved properties of the disclosed d10 metal carbene complexes are driven by the use of a pyrazine-fused NHC or a pyridine-fused NHC ligand decorated with bulky 2,6-diisopropylphenyl (DIPP) side groups in these two-coordinated d10 metal carbene complexes. The ligand structure increases the chemical and electrochemical stability, improves the electroluminescence performance as well as the photoluminescence quantum yield by suppressing the excited state structural distortions. The electroluminescence performance, i.e., ultra-high device brightness and remarkably long device lifetime, are unprecedented for d10 emitters. Further, the emission colors of this class of emitters are tunable by using carbazole derivatives with varying donor strength. For instance, green (Cu2 and Au2), yellow (Cu1, Au1, and Ag1), and red (Cu3) emitters have been prepared.

Example 1: Synthesis and characterization of compounds

Materials and Methods

[0332] The chemical reagents used for synthesis were purchased from commercial sources such as Dieckmann, Tiv Scientific, J & K Scientific, BLDpharm, Bidepharm. They were directly used without further processing.

[0333] The solvents used for synthesis were purchased from Duksan, RCI Labscan, Scharlau. They were directly used without further processing. [0334] (i) Synthesis of pyrazine fused N-heterocyclic carbene ligand or pyridine fused N-heterocyclic carbene ligand

##STR00071## [0335] (a) Synthesis of N,N′-bis(2,6-diisopropylphenyl)pyrazine-2,3-diamine

[0336] To a 1-M solution of lithium hexamethyldisilazide (LiHMDS) in THF (3.5 eq.) in a sealed tube was added 2,6-diisopropylaniline (3.0 eq.). The resulting mixture was stirred under argon for 30 min. Then, 2,3-dichloropyrazine (1.0 eq.) was added into the reaction mixture and heated at 80° C. overnight. After reaction, the solvent was evaporated to dryness and the residue was extracted with DCM, which was then purified by column chromatography. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 7.49 (s, 1H), 7.34-7.30 (m, 1H), 7.24 (d, J=7.6 Hz, 2H), 5.72 (s, 1H), 3.10 (dt, J=13.5, 6.7 Hz, 2H), 1.19 (d, J=6.7 Hz, 16H). .sup.13C NMR (100 MHz, CDCl.sub.3) δ/ppm 146.10, 144.34, 133.84, 132.40, 127.98, 124.03, 28.98, 23.88. HRESI-MS [M+H].sup.+ for [C.sub.28H.sub.38N.sub.4].sup.+, cal. m/z: 431.3169, found: 431.3168. [0337] (b) Synthesis of 1,3-bis(2,6-diisopropylphenyl)imidazo[4,5-b]pyrazin-3-ium chloride (Pzlm-Cl)

[0338] To a round bottom flask was added N,N′-bis(2,6-diisopropylphenyl)pyrazine-2,3-diamine (1.2 mmol) in triethyl orthoformate. The mixture was heated at 150° C. for 6 hours. Then the mixture was cooled down to room temperature and excess chlorotrimethylsilane was added. The resulting reaction mixture was heated at 70° C. overnight. After reaction, the precipitate was collected by filtration, washed with Et.sub.2O and dried under air to give an off-white solid. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 13.64 (br s, 1H), 8.87 (s, 2H), 7.66 (t, J=7.5 Hz, 2H), 7.42 (d, J=8.0 Hz, 4H), 2.99 (m, 4H), 1.30 — 1.12 (m, 24H). .sup.13C NMR (100 MHz, CDCl.sub.3) δ/ppm 145.66, 145.02, 137.87, 132.73, 126.21, 124.98, 30.04, 24.62, 23.53. HRESI-MS [M-Cl].sup.+ for [C.sub.29H.sub.37N.sub.4].sup.+, cal. m/z: 441.3013, found: 441.3013.

##STR00072## ##STR00073## [0339] (c) Synthesis of 2-chloro-N-(2,4,6-triisopropylphenyl)pyridin-3-amine

[0340] A mixture of 2-chloropyridin-3-amine (1.28 g, 10 mmol), (diacetoxyiodo)benzene (15 mmol), and triisopropylbenzene (100 mmol) in 1,1,1,3,3,3-hexafluoro-2-propanpol (40 mL) was stirred at room temperature overnight. After reaction, solvent was evaporated and the residue was purified by column chromatography. Yield: 2.85 g, 86%. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 7.73 (d, J=4.2 Hz, 1H), 7.08 (s, 2H), 6.95 (dd, J=8.0, 4.6 Hz, 1H), 6.45 (d, J=7.9 Hz, 1H), 5.63 (s, 1H), 3.02 (dt, J=13.7, 6.9 Hz, 2H), 2.93 (dt, J=13.8, 6.9 Hz, 1H), 1.29 (d, J=6.9 Hz, 6H), 1.18 (s, 6H), 1.10 (d, J=6.8 Hz, 6H). .sup.13C NMR (101 MHz, CDCl.sub.3) δ/ppm 148.90, 147.37, 141.30, 137.21, 136.38, 130.83, 123.54, 122.29, 119.07, 77.55, 77.23, 76.91, 34.48, 28.66, 24.79, 24.29, 23.39. HRESI-MS: [M+H].sup.+ for [C.sub.20H.sub.27N.sub.2Cl].sup.+, cal. m/z: 331.1936, found: 331.1933. [0341] (d) Synthesis of N.sup.2-(2,6-diisopropylphenyl)-N.sup.3-(2,4,6-triisopropylphenyl)-pyridine-2,3-diamine

[0342] To a solution of P.sup.TBu.sub.3 (100 mg, 0.50 mmol) in toluene (20 mL) was added Pd.sub.2(dba).sub.3 (100 mg, 0.11 mmol). The dark red solution was stirred at room temperature for five minutes. Then 2,6-diisopropylaniline (355 mg, 2.0 eq.), 2-chloro-N-(2,4,6-triisopropylphenyl)pyridin-3-amine (330 mg, 1.0 eq.) and NaO.sup.tBu (289 mg, 3.0 eq.) were added into the solution in one port. The resulting suspension was heated at 130° C. for two days. After reaction, the solution was passed through a pad of celite and evaporated to dryness. The residue was purified by column chromatography on silica gel. Yield: 167 mg, 35%. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 7.69 (d, J=4.2 Hz, 1H), 7.36-7.31 (m, 1H), 7.29 (d, J=7.3 Hz, 2H), 7.13 (s, 2H), 6.58 — 6.49 (m, 2H), 6.06 (s, 1H), 4.82 (s, 1H), 3.25 (dt, J=13.7, 6.8 Hz, 2H), 3.13 (dt, J=13.6, 6.8 Hz, 2H), 2.98 (dt, J=13.8, 6.9 Hz, 1H), 1.26 (d, J=5.7 Hz, 24H), 1.20 (s, 6H). .sup.13C NMR (101 MHz, CDCl.sub.3) δ/ppm 149.50, 146.83, 145.88, 144.72, 139.01, 135.13, 133.35, 131.35, 127.06, 123.63, 121.94, 121.11, 114.82, 34.22, 28.77, 28.36, 24.20. HRESI-MS: [M+H].sup.+ for [C.sub.32H.sub.45N.sub.3].sup.+, cal. m/z: 472.3686, found: 472.3680. [0343] (e) Synthesis of 3-(2,6-diisopropylphenyl)-1-(2,4,6-triisopropylphenyl)-1H-imidazo [4,5-b]pyridin-3-ium tetrafluoroborate salt (PyIPr-BF.sub.4)

[0344] A solution of N.sup.2-(2,6-diisopropylphenyl)-N.sup.3-(2,4,6-triisopropylphenyl)-pyridin-2,3-amine (500 mg, 1.06 mmol) in triethyl orthoformate. Then, the mixture was heated at 150° C. for several hours. Then the mixture was cooled down to room temperature and excess chlorotrimethylsilane was added. The resulting reaction mixture was heated at 70° C. overnight. After reaction, solvent was evaporated and HBF.sub.4 in methanol was added and stirred at room temperature for 30 min. After that, the solution was extracted with dichloromethane and saturated NaHCO.sub.3 aqueous solution. The organic layer was dried over MgSO.sub.4 and evaporated to give a white solid as 3-(2,6-diisopropylphenyl)-1-(2,4,6-triisopropylphenyl)-1H-imidazo[4,5-b]pyridin-3-ium tetrafluoroborate salt. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 10.32 (s, 1H), 8.85 (d, J=4.4 Hz, 1H), 7.90 (d, J=8.3 Hz, 1H), 7.76 (dd, J=8.2, 4.6 Hz, 1H), 7.66 (d, J=7.8 Hz, 2H), 7.45 (d, J=7.8 Hz, 3H), 7.27 (s, 2H), 3.04 (dt, J=13.6, 6.8 Hz, 2H), 2.22 (td, J=13.4, 6.6 Hz, 5H), 1.35 (d, J=6.8 Hz, 7H), 1.28 (dd, J=6.5, 2.9 Hz, 15H), 1.13 (t, J=6.2 Hz, 15H). .sup.19F NMR (471 MHz, CDCl.sub.3) δ/ppm -151.89-151.94. .sup.11B NMR (160 MHz, CDCl.sub.3) δ-1.31. .sup.13C NMR (126 MHz, CDCl.sub.3) δ/ppm 153.89, 151.06, 146.34, 145.86, 145.57, 144.31, 132.77, 126.57, 126.18, 125.08, 124.63, 124.29, 123.47, 123.06, 34.73, 30.01, 29.80, 24.55, 24.09, 24.02, 23.91. HRESI-MS: [M-BF.sub.4].sup.+ for [C.sub.33H.sub.44N.sub.3].sup.+, cal. m/z: 482.3529, found: 482.3516. [0345] (ii) Synthesis of metal-carbene complexes

##STR00074## [0346] (a) Synthesis of complex precursor PzImCuCl

[0347] To a solution of KO.sup.tBu (1.2 eq.) in THF was added PzIm-Cl (1.0 eq.) and CuCl (1.2 eq.). The resulting mixture was stirred at room temperature under argon overnight. After reaction, the reaction mixture was passed through a layer of celite and then evaporated to dryness. The product was washed with EtOH and n-hexane. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm .sup.1H NMR (500 MHz, CDCl.sub.3) δ 8.52 (s, 2H), 7.62 (t, J=7.5 Hz, 2H), 7.42 (d, J=7.6 Hz, 4H), 2.38-2.27 (m, 4H), 1.30 (d, J=6.2 Hz, 12H), 1.12 (d, J=6.4 Hz, 12H). .sup.13C NMR (126 MHz, CDCl.sub.3) δ/ppm 193.51, 146.31, 141.20, 140.18, 131.81, 130.38, 124.93, 29.63, 24.94, 23.84. [0348] (b) Synthesis of complex precursor PzImAuCl

[0349] To a suspension of PzIm-Cl (1.0 eq.) in THF was added KO.sup.tBu (1.2 eq.) and the resulting mixture was stirred at room temperature under argon for 1 hour during which time a solution was formed that turned clear gradually. Then Au(tht)Cl (1.2 eq.) was added and the reaction mixture was left to be stirred in dark for 16 h. After reaction, the mixture was filtered through a pad of celite and then evaporated to dryness. The product was washed with EtOH and n-hexane. Yield: 185 mg, 27%. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 8.55 (s, 2H), 7.63 (t, J=7.8 Hz, 2H), 7.41 (d, J=7.8 Hz, 4H), 2.33 (dt, J=13.8, 6.9 Hz, 4H), 1.34 (d, J=6.9 Hz, 12H), 1.10 (t, J=7.9 Hz, 12H). .sup.13C NMR (126 MHz, CDCl.sub.3) δ/ppm 188.22, 146.16, 141.49, 139.91, 131.70, 129.88, 124.75, 29.50, 24.40, 23.82. [0350] (c) Synthesis of complex precursor PzImAgCl

[0351] To a solution of PzIm-Cl (1.0 eq.) in DCM was added Ag.sub.2O (1.0 eq.). The resulting suspension was stirred in the dark at room temperature overnight. After reaction, the reaction mixture was filtered through a pad of celite then evaporated to dryness. The product was washed with EtOH and n-hexane. .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 8.56 (s, 1H), 7.63 (t, J=7.7 Hz, 1H), 7.42 (d, J=7.8 Hz, 2H), 2.31 (dt, J=13.5, 6.8 Hz, 3H), 1.28 (d, J=6.8 Hz, 7H), 1.11 (d, J=6.7 Hz, 8H). .sup.13C NMR (126 MHz, CDCl.sub.3) δ/ppm 146.32, 141.47, 140.12, 131.97, 130.65, 125.06, 29.60, 24.86, 23.96. [0352] (d) General procedure for the synthesis of complexes

[0353] To a solution of carbazole derivatives (1.5 eq.) in THF or a solution of pyrido[3,4-b]indole derivatives (1.5 eq.) in THF was added NaO.sup.tBu (1.5 eq.), and the mixture was stirred for 30 min at room temperature under argon. Then the NHC-M-Cl (1.0 eq.) was added and the reaction mixture was stirred in the dark overnight. After reaction, the mixture was passed through a pad of celite. The filtrate was evaporated to dryness and the product was washed with n-hexane.

[0354] Cu1: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.59 (s, 2H), 7.85 (d, J=7.6 Hz, 4H), 7.59 (d, J=7.8 Hz, 2H), 6.96 (t, J=7.5 Hz, 2H), 6.85 (t, J=7.3 Hz, 2H), 6.23 (d, J=8.1 Hz, 2H), 2.54-2.45 (m, 4H), 1.26 (d, J=6.8 Hz, 12H), 1.18 (d, J=6.8 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 194.61, 149.71, 146.96, 141.06, 140.27, 131.49, 130.91, 124.84, 123.88, 123.40, 119.10, 115.44, 114.06, 29.52, 24.42, 23.50.

[0355] Cu2: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.59 (s, 2H), 8.16 (s, 1H), 7.90-7.79 (m,3H), 7.58 (d, J=7.3 Hz, 4H), 7.17 (d, J=8.1 Hz, 1H), 7.05 (t, J=7.5 Hz, 1H), 6.95 (t, J=6.9 Hz, 1H), 6.27 (d, J=7.8 Hz, 1H), 6.12 (d, J=8.5 Hz, 1H), 2.46 (m, 4H), 1.22 (d, J=6.3 Hz, 12H), 1.16 (d, J=6.1 Hz, 12H). .sup.13C NMR (151 MHz, CD.sub.2Cl.sub.2) δ/ppm 194.40, 152.20, 150.93, 147.54, 141.87, 140.72, 132.15, 131.40, 127.06, 125.54, 125.46, 124.98, 124.60, 123.85, 122.50, 120.14, 117.89, 115.16, 114.93, 97.47, 30.08, 25.02, 24.04.

[0356] Cu3: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.58 (s, 2H), 7.87-7.80 (m, 4H), 7.60 (d, J=7.8 Hz, 4H), 7.02 (d, J=8.5 Hz, 2H), 6.17 (d, J=8.5 Hz, 2H), 2.50 (dt, J=13.5, 6.7 Hz, 4H), 1.37 (s, 18H), 1.28 (d, J=6.8 Hz, 12H), 1.18 (d, J=6.7 Hz, 12H)..sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 195.21, 148.72, 147.33, 141.40, 140.69, 138.38, 131.88, 131.31, 125.22, 124.08, 121.55, 115.42, 113.75, 34.70, 32.36, 29.93, 24.89, 23.90.

[0357] Cu4: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.61 (s, 2H), 8.18 (s, 2H), 7.87 (t, J=7.9 Hz, 2H), 7.68 (d, J=7.6 Hz, 4H), 7.62 (d, J=7.9 Hz, 4H), 7.42 (t, J=7.5 Hz, 4H), 7.30 (d, J=8.3 Hz, 2H), 7.25 (t, J=7.3 Hz, 2H), 6.30 (d, J=8.4 Hz, 2H), 2.52 (dq, J=13.8, 6.9 Hz, 4H), 1.30 (d, J=6.8 Hz, 12H), 1.20 (d, J=6.7 Hz, 12H)..sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 194.85, 150.39, 147.42, 143.41, 141.56, 140.68, 131.98, 131.34, 129.28, 128.96, 127.16, 125.89, 125.31, 125.10, 123.66, 118.10, 114.85, 29.97, 24.90, 23.93. MALDI-TOF: [C.sub.53H.sub.52CuN.sub.5] m/z cal. m/z: 821.35, found: 821.28. Anal. cal. for C53H52CuN.sub.5+H.sub.2O: C, 75.73; H, 6.48; N, 8.33; found: C, 75.71; H, 6.26; N, 8.10.

[0358] Cu5:.sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.64 (s, 2H), 8.03 (d, J=3.9 Hz, 1H), 7.96 (d, J=7.8 Hz, 1H), 7.89 (t, J=7.9 Hz, 2H), 7.77 (d, J=4.9 Hz, 1H), 7.70 (s, 1H), 7.63 (d, J=7.9 Hz, 4H), 7.12 (t, J=7.4 Hz, 1H), 6.96 (t, J=7.3 Hz, 1H), 6.30 (d, J=8.2 Hz, 1H), 2.52 (dt, J=13.7, 6.8 Hz, 4H), 1.29 (d, J=6.8 Hz, 12H), 1.21 (d, J=6.8 Hz, 12H).

[0359] Au1: .sup.1H NMR (400 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.58 (s, 2H), 7.87 (d, J=7.6 Hz, 2H), 7.79 (t, J=7.9 Hz, 2H), 7.54 (d, J=7.9 Hz, 4H), 7.08-6.99 (m, 2H), 6.91-6.82 (m, 2H), 6.61 (d, J=8.1 Hz, 2H), 2.48 (dt, J=13.7, 6.9 Hz, 4H), 1.32 (d, J=6.9 Hz, 12H), 1.14 (d, J=6.9 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 149.77, 147.49, 141.94, 140.93, 132.07, 131.13, 125.29, 124.25, 124.14, 119.73, 116.70, 113.92, 30.15, 24.59, 24.31.

[0360] Au2: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.61 (s, 1H), 8.20 (s, OH), 7.91 (d, J=7.7 Hz, 1H), 7.80 (t, J=7.8 Hz, 1H), 7.55 (d, J=7.8 Hz, 2H), 7.26 (d, J=8.4 Hz, OH), 7.13 (t, J=7.6 Hz, 1H), 6.99 (t, J=7.4 Hz, 1H), 6.66 (d, J=8.2 Hz,

[0361] OH), 6.56 (d, J=8.4 Hz, 1H), 2.46 (dt, J=13.6, 6.8 Hz, 2H), 1.31 (d, J=6.8 Hz, 6H), 1.15 (d, J=6.8 Hz, 6H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 190.53, 151.14, 149.91, 146.94, 141.65, 140.23, 131.61, 130.47, 126.65, 125.11, 124.78, 124.51, 123.87, 123.08, 121.68, 119.63, 117.88, 113.96, 113.77, 97.74, 29.59, 24.04, 23.74.

[0362] Au3:.sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.62 (s, 2H), 8.19 (dd, J=10.7, 5.9 Hz, 2H), 7.92 (d, J=7.8 Hz, 1H), 7.77 (t, J=7.8 Hz, 2H), 7.55 (d, J=7.8 Hz, 4H), 7.16-7.09 (m, 1H), 6.98 (t, J=7.4 Hz, 1H), 6.90-6.83 (m, 1H), 6.72 (d, J=8.1 Hz, 1H), 2.55 (dt, J=13.1, 6.6 Hz, 4H), 1.44 (d, J=6.8 Hz, 12H), 1.18 (d, J=6.8 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 191.17, 148.59, 146.78, 145.01, 141.46, 140.29, 131.44, 130.46, 126.52, 124.69, 124.43, 121.92, 119.80, 116.83, 116.13, 113.65, 112.28, 29.59, 23.98, 23.67.

[0363] Ag1: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.61 (s, 2H), 7.87 (d, J=7.5 Hz, 2H), 7.75 (t, J=7.7 Hz, 2H), 7.53 (d, J=7.7 Hz, 4H), 7.02 (t, J=7.4 Hz, 2H), 6.84 (t, J=7.2 Hz, 2H), 6.57 (d, J=8.0 Hz, 2H), 2.46 (dt, J=13.1, 6.5 Hz, 4H), 1.30 (d, J=6.6 Hz, 12H), 1.15 (d, J=6.6 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 150.27, 146.80, 141.55, 140.18, 131.69, 131.15, 124.93, 123.82, 123.41, 119.25, 115.08, 114.10, 29.57, 24.48, 23.71. Note: the .sup.13C signal for carbenium carbon was not observed.

##STR00075## [0364] (e) General procedure for synthesis of complex precursor PyIPr-M-Cl

[0365] To a suspension of PyIPr-BF.sub.4 (1.0 eq.) was added KHMDS (1.5 eq.) following by the addition of CuCl or Au(tht)Cl (1.5 eq.). The resulting mixture was stirred at room temperature under argon overnight. After reaction, the suspension was passed through a layer of celite and evaporated to dryness. The product was purified by recrystallization in DCM/EtOH.

[0366] PyIPrCuCl: .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 8.52 (dd, J=4.7, 1.3 Hz, 1H), 7.58 (t, J=7.8 Hz, 1H), 7.49 (dd, J=8.1, 1.3 Hz, 1H), 7.40 (d, J=7.8 Hz, 2H), 7.35 (dd, J=8.2, 4.7 Hz, 1H), 7.21 (s, 2H), 3.03 (dt, J=13.8, 6.9 Hz, 1H), 2.36 (tt, J=13.6, 6.8 Hz, 4H), 1.36 (d, J=6.9 Hz, 6H), 1.29 (d, J=6.8 Hz, 12H), 1.11 (dd, J=6.7, 5.7 Hz, 12H). .sup.13C NMR (101 MHz, CDCl.sub.3) δ/ppm 190.09, 151.93, 147.00, 146.75, 146.39, 146.08, 131.39, 130.95, 129.02, 127.64, 124.73, 122.94, 120.29, 120.18, 34.65, 29.46, 29.25, 25.28, 24.95, 24.14, 24.01, 23.76. HRESI-MS: [M-Cl+MeCN].sup.+ for [C.sub.35H.sub.46N.sub.4Cu].sup.+, cal. m/z: 585.3013, found: 585.3026.

[0367] PyIPrAuCl: .sup.1H NMR (500 MHz, CDCl.sub.3) δ/ppm 8.54-8.51 (m, 1H), 7.59 (t, J=7.8 Hz, 1H), 7.51-7.48 (m, 1H), 7.42-7.35 (m, 4H), 7.22-7.18 (m, 3H), 3.02 (dt, J=13.8, 6.9 Hz, 1H), 2.40-2.28 (m, 6H), 1.37 (d, J=6.9 Hz, 8H), 1.33 (d, J=6.9 Hz, 16H), 1.09 (t, J=6.4 Hz, 17H). .sup.13C NMR (101 MHz, CDCl.sub.3) δ/ppm 184.52, 151.83, 146.90, 146.44, 146.22, 145.89, 131.29, 130.48, 128.43, 127.37, 124.55, 122.80, 120.58, 120.20, 34.43, 29.32, 29.11, 24.73, 24.41, 24.01, 23.92, 23.71. HRESI-MS: [M-Cl+MeCN]+for [C.sub.35H.sub.46N.sub.4Au].sup.+, cal. m/z: 719.3388, found: 719.3378. [0368] (f) General procedure for the synthesis of complexes

[0369] To a solution of carbazole derivatives (1.5 eq.) in THF or a solution of pyrido[3,4-b]indole derivatives (1.5 eq.) in THF was added NaO.sup.tBu (1.5 eq.), and the mixture was stirred for 30 min at room temperature under argon. Then PyIPr-M-Cl (1.0 eq.) was added and the reaction mixture was stirred in dark overnight. After reaction, the mixture was passed through a pad of celite. The filtrate was evaporated to dryness and the product was washed with n-hexane.

[0370] Cu6: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.63 (dd, J=4.7, 1.2 Hz, 1H), 7.98 (dd, J=8.1, 1.2 Hz, 1H), 7.86 (t, J=7.8 Hz, 1H), 7.81 (d, J=7.6 Hz, 2H), 7.69 — 7.62 (m, 3H), 7.58 (s, 2H), 6.92 — 6.87 (m, 2H), 6.77 (t, J=7.1 Hz, 2H), 6.32 (d, J=8.1 Hz, 2H), 3.25 (dt, J=13.8, 6.9 Hz,1H), 2.63 (ddt, J=13.7, 10.6, 6.8 Hz, 4H), 1.50 (d, J=6.9 Hz, 6H), 1.28 (dd, J=14.1, 6.9 Hz, 12H), 1.22 (d, J=6.9 Hz, 6H), 1.18 (d, J=6.9 Hz, 6H). .sup.13C NMR (126 MHz, acetone-d.sub.6) δ/ppm 191.90, 153.21, 150.92, 148.10, 148.06, 147.77, 147.63, 132.81, 131.89, 130.58, 128.62, 125.50, 125.12, 124.18, 123.77, 121.83, 121.55, 119.83, 116.16, 115.05, 35.49, 25.34, 24.98, 24.59, 24.11, 23.98.

[0371] Cu7: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm=8.73 (s, 2H), 8.22 (s, 1H), 7.99-7.93 (m, 2H), 7.87 (d, J=7.6 Hz, 1H), 7.74 (d, J=7.8 Hz, 4H), 7.70 (d, J=7.6 Hz, 1H), 7.40 (d, J=7.4 Hz, 1H), 7.26-7.20 (m, 1H), 7.16-7.10 (m, 1H), 6.90-6.85 (m, 1H), 6.83-6.77 (m, 1H), 6.54 (s, 1H), 6.13 (d, J=7.7 Hz, 1H), 2.73 (dd, J=14.0, 7.3 Hz, 4H), 1.43 (s, 6H), 1.32 (d, J=6.8 Hz, 12H), 1.20 (d, J=6.7 Hz, 12H).

[0372] Cu8: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.63 (d, J=4.6 Hz, 1H), 8.23 (s, 1H), 7.94 (t, J=7.6 Hz, 2H), 7.88 (d, J=7.6 Hz, 1H), 7.71 (dd, J=12.6, 7.7 Hz, 3H), 7.65 (dd, J=8.0, 4.4 Hz, 1H), 7.60 (s, 2H), 7.40 (d, J=7.3 Hz, 1H), 7.22 (t, J=7.3 Hz, 1H), 7.12 (t, J=7.3 Hz, 1H), 6.89 (t, J=7.4 Hz, 1H), 6.79 (t, J=7.3 Hz, 1H), 6.60 (s, 1H), 6.24 (d, J=8.0 Hz, 1H), 3.27 (dt, J=13.7, 6.8 Hz, 1H), 2.72-2.61 (m, 4H), 1.51 (d, J=6.9 Hz, 6H), 1.41 (s, 6H), 1.32 (d, J=6.8 Hz, 12H), 1.21 (dd, J=14.6, 6.8 Hz, 12H).

[0373] Au4: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.57 (dd, J=4.7, 1.1 Hz, 1H), 7.89 (d, J=7.6 Hz, 2H), 7.78 (t, J=7.8 Hz, 1H), 7.66 (dd, J=8.1, 1.1 Hz, 1H), 7.54 (d, J=7.9 Hz, 2H), 7.48 (dd, J=8.1, 4.7 Hz, 1H), 7.39 (s, 2H), 7.03 (t, J=7.6 Hz, 2H), 6.87 (t, J=7.3 Hz, 2H), 6.67 (d, J=8.1 Hz, 2H), 3.15 (dt, J=13.8, 6.9 Hz, 1H), 2.59 — 2.45 (m, 4H), 1.46 (d, J=6.9 Hz, 6H), 1.34 (t, J=6.6 Hz, 12H), 1.16 (t, J=7.0 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 188.61, 152.72, 149.71, 147.44, 147.34, 147.05, 147.02, 131.61, 131.43, 129.34, 128.10, 124.88, 124.01, 123.91, 123.13, 121.08, 120.45, 119.52, 116.29, 113.80, 35.14, 29.82, 29.66, 24.72, 24.45, 24.35, 24.31, 24.05.

[0374] Au5: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.77 (s, 2H), 8.16 (s, 1H), 8.04 (d, J=5.1 Hz, 1H), 8.00 (d, J=7.8 Hz, 1H), 7.87 (t, J=7.9 Hz, 2H), 7.81 (d, J=5.0 Hz, 1H), 7.68 (d, J=7.9 Hz, 4H), 7.16 (t, J=7.6 Hz, 1H), 6.94 (t, J=7.2 Hz, 1H), 6.75 (d, J=8.3 Hz, 1H), 2.70 (dt, J=13.7, 6.8 Hz, 4H), 1.39 (d, J=6.9 Hz, 12H), 1.18 (d, J=6.8 Hz, 12H). .sup.13C NMR (126 MHz, acetone-d.sub.6) δ/ppm 190.94, 151.06, 148.05, 146.42, 142.95, 141.50, 137.61, 136.85, 132.54, 131.88, 129.14, 126.83, 125.70, 123.10, 121.65, 117.91, 115.57, 114.42, 24.73, 24.32.

[0375] Au6: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.80 (s, 2H), 8.51 (s, 2H), 7.93 (t, J=7.8 Hz, 2H), 7.71 (d, J=7.9 Hz, 4H), 7.44 (d, J=8.5 Hz, 2H), 6.73 (d, J=8.5 Hz, 2H), 2.69 (dt, J=13.7, 6.9 Hz, 4H), 1.36 (d, J=6.8 Hz, 12H), 1.18 (d, J=6.8 Hz, 12H). .sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 189.43, 151.88, 146.95, 141.89, 140.12, 131.70, 130.40, 128.06, 124.97, 124.83, 123.23, 120.89, 114.51, 99.90, 29.60, 24.06, 23.73.

[0376] Au7: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.75 (s, 2H), 8.28 (s, 1H), 7.95-7.80 (m, 3H), 7.85-7.69 (m, 5H), 7.42 (d, J=7.5 Hz, 1H), 7.24 (t, J=7.5 Hz, 1H), 7.14 (t, J=7.5 Hz, 1H), 6.98 (t, J=8.0 Hz, 1H), 6.85 (t, J=7.0 Hz, 1H), 6.65 (d, J=8.0 Hz, 1H), 2.74-2.65 (m, 4H), 1.44 (s, 6H), 1.40 (d, J=7.0 Hz, 12H), 1.18 (d, J=7.0 Hz, 12H).

[0377] Au8: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.65 (dd, J=4.7, 1.2 Hz, 1H), 8.00 (dd, J=8.1, 1.2 Hz, 1H), 7.93 (d, J=1.8 Hz, 2H), 7.82 (t, J=7.8 Hz, 1H), 7.68 (dd, J=8.1, 4.8 Hz, 1H), 7.63 (d, J=7.9 Hz, 2H), 7.56 (s, 2H), 7.08 (dd, J=8.5, 2.0 Hz, 2H), 6.66 (d, J=8.5 Hz, 2H), 3.24 (dt, J=13.8, 6.9 Hz,1H), 2.63 (tt, J=13.7, 6.9 Hz, 4H), 1.50 (d, J=6.9 Hz, 6H), 1.38 (t, J=6.9 Hz, 12H), 1.35 (s, 18H), 1.21 (d, J=6.9 Hz, 6H), 1.17 (d, J=6.9 Hz, 6H). .sup.13C NMR (126 MHz, acetone-d.sub.6) δ/ppm 189.11, 153.17, 148.99, 147.94, 147.77, 139.02, 132.48, 131.90, 130.26, 128.71, 125.33, 124.77, 123.72, 122.18, 122.01, 121.60, 115.81, 113.74, 35.52, 35.00, 32.67, 24.93, 24.66, 24.52, 24.42, 24.19.

[0378] Au9: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.66 (dd, J=4.7, 1.1 Hz, 1H), 8.02 (dd, J=8.1, 1.1 Hz, 1H), 7.91-7.81 (m, 2H), 7.70 (dd, J=8.2, 4.7 Hz, 1H), 7.64 (d, J=7.9 Hz, 2H), 7.61-7.53 (m, 3H), 7.02 (t, J=7.2 Hz, 1H), 6.83 (t, J=7.3 Hz, 1H), 6.81-6.76 (m, 1H), 6.73 (d, J=8.2 Hz, 1H), 6.61 (dd, J=8.8, 4.6 Hz, 1H), 3.23 (dq, J=14.0, 7.0 Hz, 1H), 2.62 (tt, J=13.6, 6.8 Hz, 4H), 1.49 (d, J=6.9 Hz, 6H), 1.36 (dd, J=11.9, 6.9 Hz, 12H), 1.19 (dd, J=20.0, 6.9 Hz, 12H). .sup.19F NMR (471 MHz, acetone-d.sub.6) δ/ppm -129.97. .sup.13C NMR (126 MHz, acetone-d.sub.6) δ/ppm 188.42, 157.63, 155.81, 153.29, 151.43, 148.02, 147.92, 147.87, 147.80, 146.74, 132.47, 131.96, 130.17, 128.69, 125.39, 124.98, 124.80, 124.72, 124.65, 124.61, 123.70, 122.30, 121.74, 120.43, 116.86, 114.58, 114.52, 114.45, 111.85, 111.65, 105.07, 104.88, 35.48, 24.91, 24.58, 24.54, 24.40, 24.22.

##STR00076## ##STR00077##

[0379] Cu9: .sup.1H NMR (500 MHz, acetone-d.sub.6) δ/ppm 8.23 (dd, J=6.5, 3.5 Hz, 2H), 8.00-7.96 (m, 2H), 7.95 (t, J=7.9 Hz, 2H), 7.82 (d, J=7.6 Hz, 2H), 7.74 (d, J=7.9 Hz, 4H), 6.96-6.90 (m, 2H), 6.83-6.77 (m, 2H), 6.28 (d, J=8.1 Hz, 2H), 2.86 (dt, J=13.7, 6.8 Hz, 4H), 1.30 (d, J=6.9 Hz, 12H), 1.19 (d, J=6.8 Hz, 12H).

[0380] Cu10: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.27 (dd, J=6.5, 3.5 Hz, 2H), 7.95-7.86 (m, 4H), 7.80 (d, J=7.6 Hz, 1H), 7.64 (d, J=7.9 Hz, 4H), 7.50 (dd, J=9.5, 2.5 Hz, 1H), 6.99 (t, J=7.1 Hz, 1H), 6.85 (t, J=7.3 Hz, 1H), 6.77-6.71 (m, 1H), 6.23 (d, J=8.1 Hz, 1H), 6.09 (dd, J=8.8, 4.5 Hz, 1H), 2.60 (dt, J=13.6, 6.7 Hz, 4H), 1.27 (d, J=6.9 Hz, 12H), 1.19 (d, J=6.8 Hz, 12H).

[0381] Cu11: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.26 (dd, J=6.4, 3.5 Hz, 2H), 7.93-7.85 (m, 4H), 7.68-7.59 (m, 4H), 6.79 (d, J=7.6 Hz, 2H), 6.09 (d, J=8.2 Hz, 2H), 2.60 (dt, J=13.6, 6.8 Hz, 4H), 1.27 (d, J=6.8 Hz, 12H), 1.19 (d, J=6.8 Hz, 12H).

##STR00078## ##STR00079##

[0382] Au10: .sup.1H NMR (500 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.26 (dd, J=6.4, 3.5 Hz, 1H), 7.89 (ddd, J=20.1, 11.2, 5.6 Hz, 3H), 7.62 (d, J=7.9 Hz, 2H), 7.06 (t, J=7.4 Hz, 1H), 6.90 (t, J=7.3 Hz, 1H), 6.61 (d, J=8.1 Hz, 1H), 2.60 (dt, J=13.6, 6.8 Hz, 2H), 1.36 (d, J=6.8 Hz, 7H), 1.18 (d, J=6.8 Hz, 7H)..sup.13C NMR (126 MHz, CD.sub.2Cl.sub.2) δ/ppm 198.43, 149.76, 147.78, 141.36, 140.88, 132.14, 131.37, 130.90, 129.76, 125.44, 124.37, 124.20, 119.75, 116.87, 113.97, 30.25, 24.61, 24.42.

[0383] Au11: .sup.1H NMR (400 MHz, CD.sub.2Cl.sub.2) δ/ppm 8.26 (dd, J=6.5, 3.5 Hz, 2H), 7.94-7.83 (m, 6H), 7.62 (d, J=7.9 Hz, 4H), 7.12 (dd, J=8.5, 1.8 Hz, 2H), 6.53 (d, J=8.5 Hz, 2H), 2.60 (dt, J=13.7, 6.8 Hz, 4H), 1.38 (s, 18H), 1.37 (d, J=7.0 Hz, 12H), 1.18 (d, J=6.8 Hz, 12H)..sup.13C NMR (101 MHz, CD.sub.2Cl.sub.2) δ/ppm 198.71, 148.28, 147.74, 141.33, 140.94, 139.53, 132.12, 131.38, 130.82, 129.73, 125.41, 124.16, 121.96, 115.67, 113.26, 34.91, 32.50, 30.24, 24.66, 24.42.

[0384] The structures of Cu7-Cu11 and Au5-Aull are shown below:

##STR00080## ##STR00081##

Results

[0385] The results of the instant work are presented below. The photophysical properties of complexes can be evaluated by maximum emission wavelength (λ.sub.em), emission lifetime (τ.sub.em), emission quantum yield (Φ.sub.em), radiative decay rate (k.sub.r), and non-radiative decay rate (k.sub.nr). The tem values of complexes in degassed toluene and MCP (1,3-bis(N-carbazolyl)benzene) thin films were directly obtained by absolute measurement using Hamamatsu C11347 Quantaurus-QY Absolute PL quantum yield spectrometer (PL stands for photoluminescence). Maximum emission wavelength λ.sub.em, are read from the emission spectra. The emission lifetime (τ.sub.em) measurement was performed on a Quanta Ray GCR 150-10 pulsed Nd:YAG laser system (pulse output: 355 nm). The intensity of emission decay was monitored as a function of time.

[00001]$I\left(t\right)=I_0{e}^{-t/\tau }$

I.sub.0 is the initial emission intensity, I(t) is the emission intensity at time t, τ is the emission lifetime and t is the time. The emission lifetime was determined by fitting the exponential decay using Origin software. The k.sub.r and k.sub.nr of complex can be calculated using equations k.sub.r=Φ.sub.em and k.sub.nr=(1-Φ.sub.em)/τ.sub.em, respectively. [0386] Photophysical characterization of the compounds

TABLE-US-00001 TABLE 1 Summary of photophysical properties measured in different media Complex λ.sub.em/nm τ.sub.em/μs Φ.sub.em k.sub.r(×10.sup.5)/s.sup.−1 k.sub.nr(×10.sup.5)/s.sup.−1 Degassed toluene at 298 K Cu1 620 0.18 0.29 16.1 39.4 Cu2 555 0.36 0.58 16.1 11.6 Cu3 660 0.11.sup.a 0.14 12.7 78.2 Cu4 635 0.12 0.15 12.2 70.8 Cu6 502 0.55 0.74 13.5 4.7 Cu9 721 <0.1 0.13 — — Au1 620 0.17 0.17 10.0 8.3 Au2 550 0.33.sup.a 0.73 22.1 8.2 Au3 553 0.45 0.53 11.7 10.4 Au4 500 0.45 0.76 16.9 5.3 Au5 570 0.36 0.60 16.6 11.1 Au6 485 0.36 0.72 20.0 7.8 Au8 526 0.54 0.75 13.9 4.6 Au9 500 0.58 0.82 14.1 3.1 Ag1 676 <0.1 0.06 — — 2 wt/wt % in MCP film at 298 K Cu1 576 0.42 0.80 19.0 4.8 Cu2 525 0.41 0.89 21.7 2.7 Cu3 610 0.39 0.58 14.9 10.8 Cu4 568 0.36 0.76 21.1 6.6 Cu5 525 0.44 0.40  9.1 13.6 Cu9 637 0.35 0.67 19.1 9.4 Cu10 630 0.34 0.61 17.9 11.5 Cu11 677 0.27 0.39 14.4 22.6 Au1 557 0.33 0.92 27.9 2.4 Au2 516 0.27 0.80 29.6 7.4 Au3 504 0.47 0.69 14.6 6.6 Au10 642 0.32 0.69 21.6 9.7 Au11 685 0.27 0.51 18.8 18.1 Ag1 565 0.23 0.72 31.3 12.2 5 wt/wt % in MCP film at 298 K Cu6 470 0.47 0.52 11.1 10.2 Cu7 592 0.32 0.76 23.8 7.5 Cu8 491 0.77.sup.a 0.51  6.6 6.4 Cu9 651 0.32 0.57 17.8 13.4 Cu10 653 0.27 0.54 20.0 17.0 Cu11 709 0.20 0.29 14.5 35.5 Au10 658 0.29 0.73 25.2 9.3 Au11 706 0.23 0.41 17.8 25.7 2 wt/wt % in PMMA film at 298 K Au4 468 0.75.sup.a 0.74  9.9 3.5 Au5 520 0.56 0.96 17.1 0.7 Au6 466 0.70.sup.a 0.43  6.1 8.1 Au7 568 0.24 0.47 19.6 22.1 Au8 480 0.64 0.85 13.3 2.3 Au9 470 1.23.sup.a 0.63  5.1 3.0 2-MeTHF at 77 K Cu1 500 185 — — — Cu2 429 {398 (60%), — — — 2063 (40%)}, 455 (250) Cu3 535 104 — — — Cu6 429 4000 — — — Au1 497 78 — — — Au2 424 (162.4), — — — 450 (75.9) Au3 428 (1122), 455 — — — {78 (95%), 984 (5%)} Au4 424 268 — — — Au5 473 505 — — — Au6 418 278 — — — Au8 427 (201), 436 (212), — — — 452 {62(58%), 280 (42%)} Au9 441 (660); — — — 470 (730) Ag1 504 2.2 — — — .sup.aweighted average lifetime

TABLE-US-00002 TABLE 2 Device data for Cu1 CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L.sub.max at 1000 at 1000 at 1000 CIE λ.sub.max Cu1 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 153400 60.00 55.83 62.83 42.48 20.00 18.65 (0.43, 0.55) 556 6 wt/wt % 177400 48.48 45.75 50.78 31.94 18.76 17.72 (0.49, 0.50) 573 8 wt/wt % 222200 44.69 43.66 46.20 29.06 18.72 18.31 (0.51, 0.48) 582

TABLE-US-00003 TABLE 3 Device lifetime measurement for Cu1. Device structure: ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu1:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm) 1 mA cm.sup.−2 3 mA cm.sup.−2 5 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT50 L.sub.0 LT50 L.sub.0 LT50 LT90 LT50 Conc. [cd m.sup.−2] [h] [cd m.sup.−2] [h] [cd m.sup.−2] [h] n [h] [h] 2 wt/wt % 5200 396.6 13000 59 20000 28.02 1.97 362 9233 4 wt/wt % 4300 500 11000 79.3 17000 35.2 1.94 410 8326 6 wt/wt % 4000 1000 10000 82.7 16000 37.41 2.01 415 8462 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00004 TABLE 4 Device data for Cu2 CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu2 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 12100 49.49 41.55 38.87 23.69 21.13 17.68 (0.19, 0.42) 492 4 wt/wt % 14400 53.37 48.02 39.72 27.16 20.76 18.63 (0.22, 0.46) 495 6 wt/wt % 17300 57.22 49.96 48.76 26.20 20.89 18.22 (0.25, 0.51) 504

TABLE-US-00005 TABLE 5a Device lifetime measurement for Cu2. Device structure: ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu2:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm) 1 mA cm.sup.−2 3 mA cm.sup.−2 5 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT50 L.sub.0 LT50 L.sub.0 LT50 LT90 LT50 Conc. [cd m.sup.−2] [h] [cd m.sup.−2] [h] [cd m.sup.−2] [h] n [h] [h] 2 wt/wt % 3600 132 11000 31.13 19500 14.14 1.32 52.97 713.4 4 wt/wt % 4500 112 12300 26.4 21000 12.2 1.44 64.94 978.0 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00006 TABLE 5b Device data for Cu2 (same device structure as Table 5a) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu2 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 210000 51.54 49.69 63.89 44.98 16.15 15.60 (0.30, 0.57) 512

TABLE-US-00007 TABLE 6 Device data for Cu3 CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu3 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 72500 30.63 24.94 32.08 11.73 16.51 13.44 (0.54, 0.45) 601 4 wt/wt % 46400 19.49 14.83 17.87 5.82 14.48 11.02 (0.59, 0.41) 622 6 wt/wt % 35000 15.92 11.37 14.47 4.17 13.81 9.87 (0.60, 0.40) 624

TABLE-US-00008 TABLE 7 Device lifetime measurement for Cu3. Device structure: ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu3: LLP604 (20 nm)/PT74M (5 nm)/LET321: Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm). 1 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT90 LT95 LT90 Conc. [cd m.sup.−2] [h] n [h] [h] 1 wt/wt % 2600 75.2 1.78 161 412 2 wt/wt % 2600 101 1.78 236 553 4 wt/wt % 1880 146 1.78 157 450 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00009 TABLE 8 Device data for Au1 CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Au1 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 176000 61.63 61.05 72.83 45.19 19.66 19.47 (0.42, 0.55) 554 4 wt/wt % 198000 60.29 57.26 72.07 39.98 21.28 20.21 (0.47, 0.52) 566 6 wt/wt % 202200 52.37 51.93 56.29 35.53 16.70 16.26 (0.49, 0.50) 572

TABLE-US-00010 TABLE 9 Device lifetime measurement for Au1. Device structure: ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Au1:LLP604 (30 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm) 1 mA cm.sup.−2 3 mA cm.sup.−2 5 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT50 L.sub.0 LT50 L.sub.0 LT50 LT90 LT50 Conc. [cd m.sup.−2] [h] [cd m.sup.−2] [h] [cd m.sup.−2] [h] n [h] [h] 2 wt/wt % 3600 135 11000 19.7 17000 8.96 1.74 1278 15763 4 wt/wt % 3200 76.1 8900 19.4 15000 9.68 1.33 355 3763 6 wt/wt % 3400 80.7 11000 17.9 17000 10.2 1.29 395 4972 8 wt/wt % 3300 69.3 11200 14.2 17000 8.76 1.27 305 3913 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00011 TABLE 9a Device lifetime measurement for Au1. Device structure: ITO/HAT-CN (10 nm)/FSFA (60 nm)/NPB-BC (5 nm)/Au1:NPB- BC:Al (30 nm)/ANT-Biz (5 nm)/ANT-Biz:Liq (1:1, 25 nm)/Liq (2 nm)/Al (100 nm). LT@L.sub.0 LT@1000 cd m.sup.−2 L.sub.0 LT97 LT90 LT97 LT90 Conc. [cd m.sup.−2] [h] [h] n [h] [h] 6 wt/wt % 26000 4.63 18.3 1.7 1176 4648 10 wt/wt % 26000 3.87 20.0 1.7 984 5080 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00012 TABLE 10 Device data for Au2 in Device structure (I) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Au2 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 32600 52.47 41.36 58.87 29.53 18.05 14.22 (0.26, 0.57) 518 4 wt/wt % 50100 61.54 53.15 66.17 39.08 20.49 17.73 (0.28, 0.58) 519 6 wt/wt % 59100 59.82 53.87 66.95 39.34 18.55 16.76 (0.29, 0.59) 521

TABLE-US-00013 TABLE 11 Device data for Au2 in Device structure (II) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Au2 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 10300 38.00 30.85 35.11 23.44 16.15 13.18 (0.18, 0.35) 488 4 wt/wt % 13400 38.00 35.36 35.02 27.78 13.56 12.63 (0.23, 0.45) 496 8 wt/wt % 22700 44.82 38.76 41.74 28.96 16.27 14.05 (0.22, 0.45) 494

TABLE-US-00014 TABLE 12 Comparison with other Au(I) emitters Current Current Current Reported Reported data data data for Gold(I) Gold(I) for Gold(I), for Gold(I), for Gold(I), emitter emitter Au1 Au2 Au2 CIE (x, y) EL λ.sub.max EL λ.sub.max yellow blue green green ~510 nm ~530 nm (0.47, 0.52) (0.22, 0.45) (0.34, 0.55) Maximum 44700 73100 198000 22700 230000 Brightness (cd/m.sup.2) Current 73.0 77.9 57.3 38.8 51.7 efficiency @1000 cd/m.sup.2 (cd/A) Power 37.0 35.5 40.0 29.0 54.1 efficiency @1000 cd/m.sup.2 (lm/W) External 25.2 24.5 20.2 14.1 15.9 quantum efficiency @1000 cd/m.sup.2 (%) LT @100 cd NA @1000 cd NA @1000 cd m.sup.−2 m.sup.−2 m.sup.−2 LT95 ~2 h LT90 ~5080 h LT90 ~117 h LT50 ~1446 h Reference Science Science 2017, 356, 159-163; 2017, 356, 159-163 Nat commun 2020, 11, 1758

TABLE-US-00015 TABLE 13 Comparison with other Cu(I) emitters Reported Reported Current Current Current Copper(I) Copper(I) data data data emitter emitter for Cu1 for Cu2 for Cu3 CIE (x, y) EL λ.sub.max EL λ.sub.max yellow green orange ~543 nm ~505 nm (0.43, 0.55) (0.30, 0.57) (0.58, 0.42) Maximum 54000  7790 153400; 210000 155000 Brightness 222200 (cd/m.sup.2) Current NA 29.0 55.8; 49.69 21.3 efficiency 43.7 @1000 cd/m.sup.2 (cd/A) Power NA 9.3 42.5; 44.98 12.4 efficiency 29.1 @1000 cd/m.sup.2 (lm/W) External −19 9.2 18.7; 15.60 13.8 quantum 18.3 efficiency @1000 cd/m.sup.2 (%) LT NA NA @1000 cd @1000 cd @1000 cd m.sup.−2 m.sup.−2 m.sup.−2 LT90 ~362 h LT90 ~65 h LT90 ~1160 h LT50 ~9230 h LT50 ~978h Reference J. Am. Science Chem. Soc. 2017, 356, 2019, 141, 159-163 3576-3588

TABLE-US-00016 TABLE 14 Device data for Cu3 in Device structure (II): ITO/HAT-CN (5 nm)/PT- 301 (160 nm)/EB (5 nm)/Cu3:RH (40 nm)/HB (5 nm)/ZADN:Liq (35:65, 35 nm)/Liq (1 nm)/Al (100 nm). (cf. FIGS. 14A-14D) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu3 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 155000 22.11 21.29 21.98 12.39 14.35 13.82 (0.58, 0.42) 619 4 wt/wt % 117000 17.28 16.28 14.45 8.12 13.72 12.93 (0.61, 0.39) 627 6 wt/wt % 40000 14.16 13.46 11.90 6.13 11.85 11.26 (0.61, 0.39) 628

TABLE-US-00017 TABLE 15 Device lifetime measurement for Cu3. Device structure (II): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/EB (5 nm)/Cu3:RH (40 nm)/HB (5 nm)/ZADN:Liq (35:65, 35 nm)/Liq (1 nm)/Al (100 nm) 5 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT95 LT90 LT95 LT90 Conc. [cd m.sup.−2] [h] [h] n [h] [h] 2 wt/wt % 9800 13.3 32.3 1.57 478 1160 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00018 TABLE 16 Device data for Cu4 in Device structure (I): ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA:TPBi:Cu4 (20 nm)/TPBi (50 nm)/LiF (1 nm)/Al (100 nm). (cf FIGS. 15A-15D) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu4 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 26300 40.99 35.74 46.00 18.71 17.95 15.65 (0.50, 0.49) 580 4 wt/wt % 21000 32.51 28.59 39.37 13.82 17.23 15.15 (0.54, 0.46) 595 6 wt/wt % 16800 32.67 26.30 33.11 12.27 17.15 13.88 (0.54, 0.46) 593

TABLE-US-00019 TABLE 17 Device data for Cu4 in Device structure (II): ITO/HAT-CN (5 nm)/PT- 301 (160 nm)/PT-603I (5 nm)/Cu4:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm). (cf. FIGS. 16A-16D) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Cu4 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 118000 24.46 21.20 31.71 18.47 10.57 9.15 (0.53, 0.46) 593 4 wt/wt % 97000 18.82 17.51 24.70 14.45 9.98 9.33 (0.57, 0.43) 603 6 wt/wt % 91000 17.43 16.25 22.43 12.92 9.69 9.05 (0.58, 0.42) 604

TABLE-US-00020 TABLE 18 Device lifetime measurement for Cu4. Device structure (II): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Cu4:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm). 1 mA cm.sup.−2 LT@1000 cd m.sup.−2 L.sub.0 LT95 LT90 LT95 LT90 Conc. [cd m.sup.−2] [h] [h] n [h] [h] 2 wt/wt % 1400 15.2 53.3 1.80 27.9 79.5 4 wt/wt % 1100 6.69 41.4 1.48 7.71 47.6 6 wt/wt % 1000 4.01 27.8 1.22 4.01 27.8 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00021 TABLE 19 Device data for Au2 in Device structure (III): ITO/HAT-CN (5 nm)/PT- 301 (160 nm)/PT-603I (5 nm)/Au2:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm). (cf. FIGS. 17A-17D) CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L at 1000 at 1000 at 1000 CIE λ.sub.max Au2 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 212000 49.34 44.40 62.02 49.45 15.15 13.92 (0.32, 0.55) 532 4 wt/wt % 250000 53.77 49.95 67.58 52.95 16.51 15.57 (0.33, 0.55) 534 8 wt/wt % 230000 55.23 51.68 69.41 54.13 16.96 15.86 (0.34, 0.55) 538

TABLE-US-00022 TABLE 20 Device lifetime measurement for Au2. Device structure (III): ITO/HAT-CN (5 nm)/PT-301 (160 nm)/PT-603I (5 nm)/Au2:LLP604 (20 nm)/PT74M (5 nm)/LET321:Liq (1:1, 25 nm)/Liq (1 nm)/Al (100 nm). LT@1000 cd m.sup.−2 L.sub.0 LT95 LT90 LT50 LT95 LT90 LT50 Conc. [cd m.sup.−2] [h] [h] [h] n [h] [h] [h] 2 wt/wt % 17500 0.67 1.56 19.2 1.51 50.47 117.5 1446 4 wt/wt % 21000 0.86 1.96 22.8 1.31 46.41 105.7 1230 8 wt/wt % 21200 0.66 1.55 18.9 1.28 32.90 77.28 940 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00023 TABLE 21 Device lifetime measurement for Au complex with 3,5- dimethylphenyl group..sup.a Device structure: ITO/HAT-CN (5 nm)/ PT-301 (160 nm)/Spiro-3-BFP (15 nm)/ Au complex: DMIC-TRz:DMIC-Cz (15 nm)/LET003 (20 nm)/Liq (1 nm)/Al (100 nm) L.sub.0 LT95 LT50 LT@1000 cd m.sup.-2 [cd m.sup.-2] [h] [h] n LT95 [h] LT50 [h] 2wt/wt % 5400 2.43 97 1.7 42.7 1705 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n .sup.a [00082]

TABLE-US-00024 TABLE 22 Device data for Cu6 in TCTA:DPEPO co-host. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/TCTA:DPEPO:Cu6 (20 nm)/DPEPO(10 nm)/TPBi (40 nm)/LiF (1.2 nm)/Al (100 nm). CE [cd A.sup.−1] PE [lm W.sup.−1] EQE [%] L.sub.max at 1000 at 1000 at 1000 CIE λ.sub.max Cu6 [cd m.sup.−2] Max cd m.sup.−2 Max cd m.sup.−2 Max cd m.sup.−2 (x, y) [nm] 2 wt/wt % 9110 30.3 22.8 24.7 11.1 21.2 15.9 (0.14, 0.19) 472 4 wt/wt % 15600 36.4 28.8 32.6 13.9 23.6 18.7 (0.14, 0.22) 474 6 wt/wt % 22700 33.9 32.1 29.1 15.5 20.0 18.9 (0.14, 0.25) 478

TABLE-US-00025 TABLE 23 Device lifetime measurement for Cu6. Device structure: ITO/HAT-CN (10 nm)/BPBPA (120 nm)/mCBP (10 nm)/mCBP:SiCzTrz:Cu6 (30 nm)/SF3-TRz (5 nm)/SF3-TRz:Liq (1:1, 25 nm)/Liq (2 nm)/Al (100 nm). LT@L.sub.0 LT@1000 cd m.sup.−2 L.sub.0 LT90 LT50 LT90 LT50 Conc. [cd m.sup.−2] [h] [h] n [h] [h] 2 wt/wt % 6100 0.36 5.31 1.51 5.52 81.5 4 wt/wt % 6600 0.36 5.86 1.56 6.84 111 8 wt/wt % 7600 0.4 7.46 1.66 11.6 216 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00026 TABLE 24 Device data for hyper-fluorescence OLED based on Cu6 and ν-DABNA in mCBP. Device structure: ITO/HAT-CN (10 nm)/BPBPA (120 nm)/mCBP (10 nm)/mCBP:Cu6:ν-DABNA (20 nm)/SF3-TRz (5 nm)/SF3-TRz:Liq (1:1, 25 nm)/Liq (2 nm)/Al (100 nm). EQE [%] L.sub.max CE.sub.max PE.sub.max at 1000 at 10000 CIE λ.sub.max FWHM Cu6:ν-DABNA [cd m.sup.−2] [cd A.sup.−1] [lm W.sup.−1] Max cd m.sup.−2 cd m.sup.−2 (x, y) [nm] [nm] 8:0 wt/wt % 17000 16.8 16.3 8.63 7.66 6.63 (0.18, 0.29) 477 92 8:1 wt/wt % 16500 15.6 16.1 9.70 8.51 6.82 (0.16, 0.24) 470 23 8:2 wt/wt % 15200 14.3 12.8 10.2 8.42 6.13 (0.15, 0.20) 470 19

TABLE-US-00027 TABLE 25 Device lifetime measurement for hyper-fluorescence OLED based on Cu6 and ν-DABNA in mCBP. Device structure: ITO/HAT-CN (10 nm)/BPBPA (120 nm)/mCBP (10 nm)/mCBP: Cu6: ν-DABNA (20 nm)/SF3-TRz (5 nm)/SF3-TRz: Liq (1:1, 25 nm)/Liq (2 nm)/Al (100 nm). Cu6: L.sub.0 LT90@L.sub.0 LT90@1000 cd ν-DABNA [cd m.sup.−2] [h] n m.sup.−2 [h] 8:0 wt/wt % 4000 0.48 1.64 4.7 8:1 wt/wt % 6100 0.33 1.66 6.6 8:2 wt/wt % 5000 0.76 1.72 12.2 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00028 TABLE 26 Device data for Cu7 in DMIC-Cz:DMIC-Trz co-host. Device structure: ITO/HAT-CN (10 nm)/BPBOA (80 nm)/FSF4A (5 nm)/DMIC-Cz:DMIC-Trz:Cu7 (30 nm)/ANT-Biz (5 nm)/ANT-Biz:Liq (25 nm)/Liq (2 nm)/Al (100 nm). CE [cd A.sup.−1] EQE [%] L.sub.max at 1000 at 10000 at 1000 at 10000 CIE Cu7 [cd m.sup.−2] Max cd m.sup.−2 cd m.sup.−2 Max cd m.sup.−2 cd m.sup.−2 (x, y) λ.sub.max 2 wt/wt % 190000 27.3 27.2 26.3 14.7 14.7 14.2 (0.56, 0.44) 600 4 wt/wt % 160000 25.6 25.4 24.1 14.4 14.2 13.5 (0.57, 0.43) 601 6 wt/wt % 113000 18.9 18.4 16.8 11.9 11.6 10.6 (0.58, 0.42) 604

TABLE-US-00029 TABLE 27 Device data for hyper-fluorescence OLED based on Cu7 and MR-R in RH. Device structure: ITO/HAT-CN (10 nm)/HT (40 nm)/EB (5 nm)/Cu7:MR-R:RH (40 nm)/HB (5 nm)/ZADN:Liq (35:65) (35 nm)/Liq (2 nm)/Al (100 nm) CE [cd A.sup.−1] EQE [%] L.sub.max at 1000 at 10000 at 1000 at 10000 CIE λ.sub.max FWHM Cu7:MR-R [cd m.sup.−2] Max cd m.sup.−2 cd m.sup.−2 Max cd m.sup.−2 cd m.sup.−2 (x, y) [nm] [nm] 10:0 wt/wt % 109000 18.7 18.5 17.6 15.5 15.4 14.6 (0.59, 0.41) 612 125 10:0.3 wt/wt % 124000 22.7 22.6 21.7 14.5 14.4 13.8 (0.61, 0.39) 613 36

TABLE-US-00030 TABLE 28 Device lifetime measurement for OLEDs based on Cu7 and MR-R in RH. Device structure: ITO/HAT-CN (10 nm)/HT (40 nm)/EB (5 nm)/Cu7:MR-R:RH (40 nm)/HB (5 nm)/ZADN:Liq (35:65) (35 nm)/Liq (2 nm)/Al (100 nm). LT@L.sub.0 LT@1000 cd m.sup.−2 L.sub.0 LT95 LT90 LT95 LT90 Cu7:MR-R [cd m.sup.−2] [h] [h] n [h] [h] 10:0 wt/wt % 8000 29.9 72 1.7 1026 2462 10:0.3 wt/wt % 8000 46.5 109 1.7 1595 3740 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

TABLE-US-00031 TABLE 29 Device data for hyper-fluorescence OLEDs based on Au3 and BN-2 in mCBP. Device structure: ITO/HAT-CN (5 nm)/TAPC (40 nm)/mCBP (10 nm)/Au3:BN- 2:mCBP (20 nm)/PPF (10 nm)/TmPyPb (40 nm)/LiF (1.2 nm)/Al (100 nm). EQE [%] L.sub.max CE.sub.max PE.sub.max at 1000 at 10000 CIE λ.sub.max FWHM Au3:BN-2 [cd m.sup.−2] [cd A.sup.−1] [lm W.sup.−1] Max cd m.sup.−2 cd m.sup.−2 (x, y) [nm] [nm] 6:1 wt/wt % 256000 92.2 90.9 25.3 19.1 16.2 (0.29, 0.65) 41 535 10:0.6 wt/wt % 247000 86.4 76.8 21.7 19.0 15.7 (0.29, 0.66) 41 536 6:0 wt/wt % 187000 71.2 63.6 23.0 21.4 19.6 (0.25, 0.57) 72 514

TABLE-US-00032 TABLE 30 Device data for OLEDs based on Au5 in mCBP:CzSiTrz co-host. Device structure: ITO/HAT-CN (10 nm)/FSFA (120 nm)/mCBP (10 nm)/mCBP:CzSiTrz:Au5 (30 nm)/SF3-Trz (5 nm)/SF3-Trz:Liq (25 nm)/Liq (2 nm)/Al (100 nm). EQE [%] L.sub.max CE.sub.max PE.sub.max at 1000 at 10000 CIE λ.sub.max FWHM Au5 [cd m.sup.−2] [cd A.sup.−1] [lm W.sup.−1] Max cd m.sup.−2 cd m.sup.−2 (x, y) [nm] [nm] 2 wt/wt % 183000 69.3 66.0 20.8 19.1 17.5 (0.32, 0.56) 533 94 4 wt/wt % 300000 65.6 58.9 19.4 18.6 16.9 (0.35, 0.57) 543 96 8 wt/wt % 195000 70.8 67.4 20.7 19.0 17.4 (0.37, 0.57) 543 94

TABLE-US-00033 TABLE 31 Device lifetime measurement for Au5. Device structure: ITO/HAT-CN (10 nm)/FSFA (120 nm)/mCBP (10 nm)/mCBP:CzSiTrz:Au5 (30 nm)/SF3-Trz (5 nm)/SF3-Trz:Liq (25 nm)/Liq (2 nm)/Al (100 nm). LT@L.sub.0 LT@1000 cd m.sup.−2 L.sub.0 LT90 LT70 LT90 LT70 Conc. [cd m.sup.−2] [h] [h] n [h] [h] 2 wt/wt % 17500 0.99 5.87 1.74 144 854 4 wt/wt % 6000 2.36 15.0 1.69 49 310 8 wt/wt % 18000 0.60 3.13 1.56 54 284 n denotes for acceleration factor in LT(L.sub.1) = LT(L.sub.0) × (L.sub.0/L.sub.1).sup.n

[0387] Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of skill in the art to which the disclosed invention belongs. Publications cited herein and the materials for which they are cited are specifically incorporated by reference. Further, unless otherwise indicated, use of the expression “wt %” refers to “wt/wt %.”

[0388] Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are intended to be encompassed by the following claims.