ORGANOMETALLIC COMPOUND, ORGANIC LIGHT-EMITTING DEVICE INCLUDING ORGANOMETALLIC COMPOUND, AND ELECTRONIC APPARATUS INCLUDING ORGANIC LIGHT-EMITTING DEVICE

Abstract

An organometallic compound, represented by Formula 1:

M.sub.1(Ln.sub.1).sub.n1(Ln.sub.2).sub.n2 Formula 1

wherein, Ln.sub.1 is a ligand represented by Formula 1-1, Ln.sub.2 is a ligand represented by Formula 2-1 or Formula 2-2, n1 may be 1 or 2, and n2 may be 1 or 2, wherein the other substituents may be understood by referring to the descriptions thereof provided herein:

##STR00001##

Claims

1. An organometallic compound, represented by Formula 1:
M.sub.1(Ln.sub.1).sub.n1(Ln.sub.2).sub.n2 Formula 1 wherein, in Formula 1, M.sub.1 is a transition metal, Ln.sub.1 is a ligand represented by Formula 1-1, Ln.sub.2 is a ligand represented by Formula 2-1 or Formula 2-2, n1 is 1 or 2, and n2 is 1 or 2: ##STR00106## wherein, in Formulae 1-1, 2-1, and 2-2, CY.sub.11 is a 5-membered carbocyclic group or a 5-membered heterocyclic group, CY.sub.12 is a 6-membered heterocyclic group, X.sub.31 and X.sub.32 are each independently O or S, R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an am idino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C.sub.1-C.sub.60 alkyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkenyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkynyl group, a substituted or unsubstituted C.sub.1-C.sub.60 alkoxy group, a substituted or unsubstituted C.sub.1-C.sub.60 alkylthio group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkyl group, a substituted or unsubstituted C.sub.1-C.sub.10 heterocycloalkyl group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkenyl group, a substituted or unsubstituted C.sub.2-C.sub.10 heterocycloalkenyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 alkyl aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 aryl alkyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryloxy group, a substituted or unsubstituted C.sub.6-C.sub.60 arylthio group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkyl heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 heteroaryl alkyl group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroaryloxy group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —Si(Q.sub.11)(Q.sub.12)(Q.sub.13), —Ge(Q.sub.11)(Q.sub.12)(Q.sub.13), —N(Q.sub.4)(Q.sub.5), —B(Q.sub.8)(Q.sub.7), —P(Q.sub.8)(Q.sub.9), or —P(═O)(Q.sub.8)(Q.sub.9), at least two of R.sub.10A(s) are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.30 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.39 heterocyclic group, at least two of R.sub.10B(s) are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.30 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.39 heterocyclic group, at least two of R.sub.21 to R.sub.28 are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.39 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.30 heterocyclic group, at least two of R.sub.31 to R.sub.37 are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.39 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.30 heterocyclic group, at least two of R.sub.41 to R.sub.44 are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.39 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.30 heterocyclic group, at least two of R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 are optionally bound to form a substituted or unsubstituted C.sub.5-C.sub.39 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.39 heterocyclic group, b11 is 1, 2, 3, or 4, b12 is 1, 2, 3, or 4, * and *′ each indicate a binding site to M.sub.1, and at least one substituent of the substituted C.sub.1-C.sub.60 alkyl group, the substituted C.sub.2-C.sub.60 alkenyl group, the substituted C.sub.2-C.sub.60 alkynyl group, the substituted C.sub.1-C.sub.60 alkoxy group, the substituted C.sub.1-C.sub.60 alkylthio group, the substituted C.sub.3-C.sub.10 cycloalkyl group, the substituted C.sub.1-C.sub.10 heterocycloalkyl group, the substituted C.sub.3-C.sub.10 cycloalkenyl group, the substituted C.sub.1-C.sub.10 heterocycloalkenyl group, the substituted C.sub.8-C.sub.60 aryl group, the substituted C.sub.7-C.sub.60 alkyl aryl group, the substituted C.sub.7-C.sub.60 aryl alkyl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.8-C.sub.60 arylthio group, the substituted C.sub.1-C.sub.60 heteroaryl group, the substituted C.sub.2-C.sub.60 alkyl heteroaryl group, the substituted C.sub.2-C.sub.60 heteroaryl alkyl group, the substituted C.sub.1-C.sub.60 heteroaryloxy group, the substituted C.sub.1-C.sub.60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is: deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, or a C.sub.1-C.sub.60 alkylthio group; a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, or a C.sub.1-C.sub.60 alkylthio group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q.sub.11)(Q.sub.12)(Q.sub.13), —Ge(C.sub.211)(Q.sub.12)(Q.sub.13), —N(Q.sub.14)(Q.sub.15), —B(Q.sub.16)(Q.sub.17), —P(Q.sub.18)(Q.sub.19), —P(═O)(Q.sub.18)(Q.sub.19), or a combination thereof; a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group; a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, a C.sub.1-C.sub.60 alkylthio group, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.7-C.sub.60 aryl alkyl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.2-C.sub.60 heteroaryl alkyl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q.sub.21)(Q.sub.22)(Q.sub.23), —Ge(Q.sub.21)(Q.sub.22)(Q.sub.23), —N(Q.sub.24)(Q.sub.25), —B(Q.sub.26)(Q.sub.27), —P(Q.sub.28)(Q.sub.29), —P(═O)(Q.sub.28)(Q.sub.29), or a combination thereof; or —Si(Q.sub.31)(Q.sub.32)(Q.sub.33), —Ge(Q.sub.31)(Q.sub.32)(Q.sub.33), —N(Q.sub.34)(Q.sub.35), —B(Q.sub.36)(Q.sub.37), —P(Q.sub.38)(Q.sub.39), or —P(═O)(Q.sub.38)(Q.sub.39), wherein Q.sub.1 to Q.sub.9, Q.sub.11 to Q.sub.19, Q.sub.21 to Q.sub.29, and Q.sub.31 to Q.sub.39 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C.sub.1-C.sub.60 alkyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkenyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkynyl group, a substituted or unsubstituted C.sub.1-C.sub.60 alkoxy group, a substituted or unsubstituted C.sub.1-C.sub.60 alkylthio group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkyl group, a substituted or unsubstituted C.sub.1-C.sub.10 heterocycloalkyl group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkenyl group, a substituted or unsubstituted C.sub.1-C.sub.10 heterocycloalkenyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 alkyl aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 aryl alkyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryloxy group, a substituted or unsubstituted C.sub.6-C.sub.60 arylthio group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkyl heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 heteroaryl alkyl group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroaryloxy group, a substituted or unsubstituted C.sub.1-C.sub.60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, or a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group.

2. The organometallic compound of claim 1, wherein M.sub.1 is iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), or rhodium (Rh).

3. The organometallic compound of claim 1, wherein M.sub.1 is Ir, and a sum of (n1 and n2) is equal to 3.

4. The organometallic compound of claim 1, wherein CY.sub.11 is a cyclopentadiene group, a furan group, a thiophene group, a selenophene group, a 1H-pyrrole group, a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, or a thiadiazole group, and CY.sub.12 is a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, or a triazine group.

5. The organometallic compound of claim 1, wherein each Ln.sub.1 independently is represented by Formula 1A or Formula 1B: ##STR00107## wherein, in Formulae 1A and 1B, CY.sub.11 and R.sub.21 to R.sub.28 are respectively understood by referring to the descriptions of CY.sub.11 and R.sub.21 to R.sub.28 in claim 1, X.sub.11 is C(R.sub.11) or N, and X.sub.12 is C(R.sub.12) or N, R.sub.11 and R.sub.12 are each independently understood by referring to the description of R.sub.10A in claim 1, and * and *′ each indicate a binding site to M.sub.1.

6. The organometallic compound of claim 1, wherein each Ln.sub.1 independently is represented by Formula 1A-1, Formula 1A-2, Formula 1B-1, or Formula 1B-2: ##STR00108## wherein, in Formulae 1A-1, 1A-2, 1B-1, and 1B-2, R.sub.21 to R.sub.28 are understood by referring to the descriptions of R.sub.21 to R.sub.28 in claim 1, and R.sub.11 is C(R.sub.11) or N, X.sub.12 is C(R.sub.12) or N, X.sub.13 is C(R.sub.13) or N, and X.sub.14 is C(R.sub.14) or N, X.sub.1 is O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), R.sub.11 to R.sub.16 are each independently understood by referring to the description of R.sub.10A in claim 1, and * and *′ each indicate a binding site to Mu.

7. The organometallic compound of claim 1, wherein each Ln.sub.1 independently is represented by one of Formulae 11-1 to 11-4: ##STR00109## ##STR00110## wherein, in Formulae 11-1 to 11-4, R.sub.21 to R.sub.28 are understood by referring to the descriptions of R.sub.21 to R.sub.28 in claim 1, and X.sub.1 is O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), R.sub.11 to R.sub.16 are each independently understood by referring to the description of R.sub.10A in claim 1, and * and *′ each indicate a binding site to M.sub.1.

8. The organometallic compound of claim 1, wherein each Ln.sub.2 independently is represented by one of Formulae 21-1 to 21-4: ##STR00111## wherein, in Formulae 21-1 to 21-4, R.sub.31 to R.sub.37 are understood by referring to the descriptions of R.sub.31 to R.sub.37 in claim 1, and and *′ each indicate a binding site to M.sub.1.

9. The organometallic compound of claim 1, wherein each Ln.sub.2 independently is represented by one of Formulae 22-1 to 22-16: ##STR00112## ##STR00113## ##STR00114## wherein, in Formulae 22-1 to 22-16, R.sub.41 to R.sub.44 are understood by referring to the descriptions of R.sub.41 to R.sub.44 in claim 1, provided that R.sub.41 to R.sub.44 are each not hydrogen, and * and *′ each indicate a binding site to M.sub.1.

10. The organometallic compound of claim 1, wherein RIM, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 are each independently: hydrogen, deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, a C.sub.1-C.sub.60 alkylthio group, —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), or —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3); or a group represented by one of Formulae 9-1 to 9-67, 9-201 to 9-244, 10-1 to 10-154, or 10-201 to 10-350: ##STR00115## ##STR00116## ##STR00117## ##STR00118## ##STR00119## ##STR00120## ##STR00121## ##STR00122## ##STR00123## ##STR00124## ##STR00125## ##STR00126## ##STR00127## ##STR00128## ##STR00129## ##STR00130## ##STR00131## ##STR00132## ##STR00133## ##STR00134## ##STR00135## ##STR00136## ##STR00137## ##STR00138## ##STR00139## ##STR00140## ##STR00141## ##STR00142## ##STR00143## ##STR00144## wherein, in Formulae 9-1 to 9-67, 9-201 to 9-244, 10-1 to 10-154, and 10-201 to 10-350, * represents a binding site to an adjacent atom, “Ph” represents a phenyl group, “TMS” represents a trimethylsilyl group, and “TMG” represents a trimethylgermyl group.

11. The organometallic compound of claim 1, wherein R.sub.31 to R.sub.37 are each independently hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a 2-methylbutyl group, a sec-pentyl group, a tert-pentyl group, a neo-pentyl group, a 3-pentyl group, or a 3-methyl-2-butyl group.

12. The organometallic compound of claim 1, wherein R.sub.41 to R.sub.44 are each independently hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a 2-methylbutyl group, a sec-pentyl group, a tert-pentyl group, a neo-pentyl group, a 3-pentyl group, a 3-methyl-2-butyl group, a phenyl group, a biphenyl group, a C.sub.1-C.sub.20 alkylphenyl group, or a naphthyl group.

13. The organometallic compound of claim 1, wherein the organometallic compound is represented by one or more of Formulae 31-1 to 31-8: ##STR00145## ##STR00146## ##STR00147## ##STR00148## wherein, in Formulae 31-1 to 31-8, M.sub.1, n1, n2, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 are understood by referring to the descriptions of M.sub.1, n1, n2, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 in claim 1, X.sub.1 is O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), and R.sub.11 to R.sub.16 are each independently understood by referring to the description of R.sub.10A in claim 1.

14. The organometallic compound of claim 1, wherein the organometallic compound is electrically neutral.

15. The organometallic compound of claim 1, wherein the organometallic compound is represented by one or more of Compounds 1 to 25: ##STR00149## ##STR00150## ##STR00151##

16. An organic light-emitting device, comprising: a first electrode; a second electrode; and an organic layer located between the first electrode and the second electrode, wherein the organic layer comprises an emission layer, and wherein the organic layer further comprises at least one of the organometallic compound of claim 1.

17. The organic light-emitting device of claim 16, wherein the emission layer comprises the at least one of the organometallic compound.

18. The organic light-emitting device of claim 17, wherein an amount of the host in the emission layer is greater than an amount of the at least one of the organometallic compound in the emission layer.

19. The organic light-emitting device of claim 16, wherein the first electrode is an anode, the second electrode is a cathode, the organic layer further comprises a hole transport region located between the first electrode, and the emission layer and an electron transport region located between the emission layer and the second electrode, the hole transport region comprises a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or a combination thereof, and the electron transport region comprises a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof.

20. An electronic apparatus, comprising the organic light-emitting device of claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0037] The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with

[0038] FIGURE which is a schematic cross-sectional view of an organic light-emitting device according to one or more embodiments.

DETAILED DESCRIPTION

[0039] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the FIGURES, to explain aspects. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

[0040] The terminology used herein is for the purpose of describing one or more exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term “or” means “and/or.” It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

[0041] It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers, and/or sections, these elements, components, regions, layers, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of the present embodiments.

[0042] Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.

[0043] It will be understood that when an element is referred to as being “on” another element, it can be directly in contact with the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this general inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0045] “About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

[0046] An organometallic compound is represented by Formula 1:

M.sub.1(Ln.sub.1)n1(Ln.sub.2).sub.n2 Formula 1

wherein, in Formula 1, M.sub.1 is a transition metal.

[0047] In one or more embodiments, in Formula 1, M.sub.1 may be a fourth-row transition metal, a fifth-row transition metal, or a sixth-row transition metal in the Periodic Table of Elements.

[0048] In one or more embodiments, M.sub.1 may be iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), or rhodium (Rh).

[0049] For example, M.sub.1 may be Ir, Os, Pt, Pd, or Au.

[0050] In one or more embodiments, M.sub.1 may be Ir.

[0051] In Formula 1, n1 is 1 or 2.

[0052] In Formula 1, n2 is 1 or 2.

[0053] In one or more embodiments, M.sub.1 may be Ir, and the sum of (n1+n2) may be equal to 3.

[0054] In Formula 1, Ln.sub.1 is a ligand represented by Formula 1-1:

##STR00003##

[0055] wherein, in Formula 1-1, * and *′ each indicate a binding site to M.sub.1.

[0056] For example, a bond between *—N moiety and M.sub.1 in Formula 1 may be a coordinate bond, and wherein, in Formula 1, a bond between *LC and M.sub.1 in in Formula 1 may be a covalent bond.

[0057] In Formula 1-1, CY.sub.11 is a 5-membered carbocyclic group or a 5-membered heterocyclic group.

[0058] In one or more embodiments, CY.sub.11 may be a cyclopentadiene group, a furan group, a thiophene group, selenophene, a 1H-pyrrole group, a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, or a thiadiazole group.

[0059] In Formula 1-1, CY.sub.12 is a 6-membered heterocyclic group.

[0060] In one or more embodiments, CY.sub.12 may be a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, or a triazine group.

[0061] In one or more embodiments, Ln.sub.1 may be represented by Formula 1A or Formula 1B:

##STR00004##

[0062] wherein, in Formulae 1A and 1B,

[0063] CY.sub.11 and R.sub.21 to R.sub.28 may be understood by referring to the descriptions of CY.sub.11 and R.sub.21 to R.sub.28 provided herein,

[0064] X.sub.11 may be C(R.sub.11) or N, and X.sub.12 may be C(R.sub.12) or N,

[0065] R.sub.11 and R.sub.12 may each independently be understood by referring to the description of R.sub.10A provided herein, and

[0066] * and *′ each indicate a binding site to M.sub.1.

[0067] In one or more embodiments, Ln.sub.1 may be represented by Formula 1A-1, Formula 1A-2, Formula 1B-1, or Formula 1B-2:

##STR00005##

wherein, in Formulae 1A-1, 1A-2, 1B-1, and 1B-2,

[0068] R.sub.21 to R.sub.28 may be understood by referring to the descriptions of R.sub.21 to R.sub.28 provided herein,

[0069] X.sub.11 may be C(R.sub.11) or N, X.sub.12 may be C(R.sub.12) or N, X.sub.13 may be C(R.sub.13) or N, and X.sub.14 may be C(R.sub.14) or N,

[0070] X.sub.1 may be O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), and

[0071] R.sub.11 to R.sub.16 may each independently be understood by referring to the description of R.sub.10A provided herein, and

[0072] * and *′ each indicate a binding site to M.sub.1.

[0073] In one or more embodiments, Ln.sub.1 may be represented by one of Formulae 11-1 to 11-4:

##STR00006## ##STR00007##

wherein, in Formulae 11-1 to 11-4,

[0074] R.sub.21 to R.sub.28 may be understood by referring to the descriptions of R.sub.21 to R.sub.28 provided herein,

[0075] X.sub.1 may be O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), and

[0076] R.sub.11 to R.sub.16 may each independently be understood by referring to the description of R.sub.10A provided herein, and

[0077] * and *′ each indicate a binding site to M.sub.1.

[0078] Ln.sub.2 is a ligand represented by Formula 2-1 or Formula 2-2:

##STR00008##

wherein, in Formulae 2-1 and 2-2, * and *′ each indicate a binding site to M.sub.1.

[0079] In Formula 2-1, a bond between *—X.sub.31 moiety and M.sub.1 in Formula 1 may be a coordinate bond.

[0080] In Formula 2-1, a bond between *—X.sub.32 moiety and M.sub.1 in Formula 1 may be a covalent bond.

[0081] In Formula 2-2, a bond between *—O moiety and M.sub.1 in Formula 1 may be a covalent bond.

[0082] In Formula 2-2, a bond between *—N moiety and M.sub.1 in Formula 1 may be a coordinate bond.

[0083] In Formula 2-1, X.sub.31 and X.sub.32 are each independently O or S.

[0084] In Formula 2-1, R.sub.31 to R.sub.37 may respectively be understood by referring to the descriptions of R.sub.21 to R.sub.28 provided herein.

[0085] In Formula 2-2-, R.sub.41 to R.sub.44 may respectively be understood by referring to the descriptions of R.sub.21 to R.sub.28 provided herein.

[0086] In one or more embodiments, Ln.sub.2 may be represented by one of Formulae 21-1 to 21-4:

##STR00009##

wherein, in Formulae 21-1 to 21-4,

[0087] R.sub.31 to R.sub.37 may respectively be understood by referring to the descriptions of R.sub.21 to R.sub.28 provided herein, and

[0088] * and *′ each indicate a binding site to M.sub.1.

[0089] In one or more embodiments, Ln.sub.2 may be represented by one of Formulae 22-1 to 22-16:

##STR00010## ##STR00011## ##STR00012##

wherein, in Formulae 22-1 to 22-16,

[0090] R.sub.41 to R.sub.44 may respectively be understood by referring to the descriptions of R.sub.41 to R.sub.44 provided herein, provided that R.sub.41 to R.sub.44 may not each be hydrogen, and

[0091] * and *′ each indicate a binding site to M.sub.1.

[0092] In Formulae 1-1, 2-1, and 2-2, R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an am idino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C.sub.1-C.sub.60 alkyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkenyl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkynyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, a substituted or unsubstituted C.sub.3-C.sub.10 cycloalkenyl group, a substituted or unsubstituted C.sub.2-C.sub.10 heterocycloalkenyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 alkyl aryl group, a substituted or unsubstituted C.sub.7-C.sub.60 aryl alkyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryloxy group, a substituted or unsubstituted C.sub.6-C.sub.60 arylthio group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 alkyl heteroaryl group, a substituted or unsubstituted C.sub.2-C.sub.60 heteroaryl alkyl group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3), —N(Q.sub.4)(Q.sub.5), —B(Q.sub.6)(Q.sub.7), —P(Q.sub.8)(Q.sub.9), or —P(═O)(Q.sub.8)(Q.sub.9).

[0093] In one or more embodiments, R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 may each independently be hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.20 alkyl group, a C.sub.2-C.sub.20 alkenyl group, a C.sub.1-C.sub.20 alkoxy group, or a C.sub.1-C.sub.20 alkylthio group;

[0094] a C.sub.1-C.sub.20 alkyl group, a C.sub.2-C.sub.20 alkenyl group, a C.sub.1-C.sub.20 alkoxy group, or a C.sub.1-C.sub.20 alkylthio group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.10 alkyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group (a bicyclo[2.2.1]heptyl group), a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.2]octyl group, a (C.sub.1-C.sub.20 alkyl)cyclopentyl group, a (C.sub.1-C.sub.20 alkyl)cyclohexyl group, a (C.sub.1-C.sub.20 alkyl)cycloheptyl group, a (C.sub.1-C.sub.20 alkyl)cyclooctyl group, a (C.sub.1-C.sub.20 alkyl)adamantanyl group, a (C.sub.1-C.sub.20 alkyl)norbornanyl group, a (C.sub.1-C.sub.20 alkyl)norbornenyl group, a (C.sub.1-C.sub.20 alkyl)cyclopentenyl group, a (C.sub.1-C.sub.20 alkyl)cyclohexenyl group, a (C.sub.1-C.sub.20 alkyl)cycloheptenyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[1.1.1]pentyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[2.1.1]hexyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C.sub.1-C.sub.20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, or a combination thereof;

[0095] a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.2]octyl group, a phenyl group, a (C.sub.1-C.sub.20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, or an azadibenzothiophenyl group, each unsubstituted or substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.20 alkyl group, a deuterated C.sub.1-C.sub.20 alkyl group, a C.sub.1-C.sub.20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.2]octyl group, a (C.sub.1-C.sub.20 alkyl)cyclopentyl group, a (C.sub.1-C.sub.20 alkyl)cyclohexyl group, a (C.sub.1-C.sub.20 alkyl)cycloheptyl group, a (C.sub.1-C.sub.20 alkyl)cyclooctyl group, a (C.sub.1-C.sub.20 alkyl)adamantanyl group, a (C.sub.1-C.sub.20 alkyl)norbornanyl group, a (C.sub.1-C.sub.20 alkyl)norbornenyl group, a (C.sub.1-C.sub.20 alkyl)cyclopentenyl group, a (C.sub.1-C.sub.20 alkyl)cyclohexenyl group, a (C.sub.1-C.sub.20 alkyl)cycloheptenyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[1.1.1]pentyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[2.1.1]hexyl group, a (C.sub.1-C.sub.20 alkyl)bicyclo[2.2.2]octyl group, a phenyl group, a (C.sub.1-C.sub.20 alkyl)phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, or a combination thereof; or

[0096] —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3), —N(Q.sub.4)(Q.sub.5), —B(Q.sub.6)(Q.sub.7), —P(Q.sub.8)(Q.sub.9), or —P(═O)(Q.sub.8)(Q.sub.9),

[0097] wherein Q.sub.1 to Q.sub.9 may each independently be:

[0098] deuterium, —F, —CH.sub.3, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CH.sub.2CH.sub.3, —CH.sub.2CD.sub.3, —CH.sub.2CD.sub.2H, —CH.sub.2CDH.sub.2, —CHDCH.sub.3, —CHDCD.sub.2H, —CHDCDH.sub.2, —CHDCD.sub.3, —CD.sub.2CD.sub.3, —CD.sub.2CD.sub.2H, —CD.sub.2CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, —CH.sub.2CF.sub.3, —CH.sub.2CF.sub.2H, —CH.sub.2CFH.sub.2, —CHFCH.sub.3, —CHFCF.sub.2H, —CHFCFH.sub.2, —CHFCF.sub.3, —CF.sub.2CF.sub.3, —CF.sub.2CF.sub.2H, or —CF.sub.2CFH.sub.2; or

[0099] an n-propyl group, an iso-propyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neopentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, a phenyl group, a biphenyl group, or a naphthyl group, each unsubstituted or substituted with at least one of deuterium, —F, a C.sub.1-C.sub.10 alkyl group, a phenyl group, or a combination thereof.

[0100] As used herein, the term “iso-propyl group” refers to a 1-methylethyl group; the term “isobutyl group” refers to a 2-methylpropyl group; the term “tert-butyl group” refers to a 1,1-dimethylethyl group; the term “neopentyl group” refers to a 2,2-dimethylpropyl group; the term “isopentyl group” refers to a 3-methylbutyl group; and the term “sec-pentyl group” refers to a 1-methylbutyl group.

[0101] In one or more embodiments, R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 may each independently be:

[0102] hydrogen, deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, or a C.sub.1-C.sub.60 alkylthio group; or

[0103] a group represented by one of Formulae 9-1 to 9-67, 9-201 to 9-244, 10-1 to 10-154, or 10-201 to 10-350:

##STR00013## ##STR00014## ##STR00015## ##STR00016## ##STR00017## ##STR00018## ##STR00019## ##STR00020## ##STR00021## ##STR00022## ##STR00023## ##STR00024## ##STR00025## ##STR00026## ##STR00027## ##STR00028## ##STR00029## ##STR00030## ##STR00031##

##STR00032## ##STR00033## ##STR00034## ##STR00035## ##STR00036## ##STR00037## ##STR00038## ##STR00039## ##STR00040## ##STR00041## ##STR00042## ##STR00043## ##STR00044## ##STR00045## ##STR00046## ##STR00047## ##STR00048## ##STR00049## ##STR00050## ##STR00051## ##STR00052## ##STR00053## ##STR00054## ##STR00055## ##STR00056## ##STR00057## ##STR00058##

wherein, in Formulae 9-1 to 9-67, 9-201 to 9-244, 10-1 to 10-154, and 10-201 to 10-350, * represents a binding site to an adjacent atom, “Ph” represents a phenyl group, “TMS” represents a trimethylsilyl group, and “TMG” represents a trimethylgermyl group.

[0104] In one or more embodiments, R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 may each independently be hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a 2-methylbutyl group, a sec-pentyl group, a tert-pentyl group, a neo-pentyl group, a 3-pentyl group, a 3-methyl-2-butyl group, a phenyl group, a biphenyl group, a C.sub.1-C.sub.20 alkylphenyl group, or a naphthyl group.

[0105] In one or more embodiments, R.sub.10A, R.sub.10B, and R.sub.21 to R.sub.28 may each independently be hydrogen, a C.sub.1-C.sub.60 alkyl group, a C.sub.1-C.sub.60 aryl group, —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), or —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3).

[0106] In one or more embodiments, R.sub.31 to R.sub.37 may each independently be hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a 2-methylbutyl group, a sec-pentyl group, a tert-pentyl group, a neo-pentyl group, a 3-pentyl group, or a 3-methyl-2-butyl group.

[0107] In one or more embodiments, R.sub.41 to R.sub.44 may each independently be hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a 2-methylbutyl group, a sec-pentyl group, a tert-pentyl group, a neo-pentyl group, a 3-pentyl group, a 3-methyl-2-butyl group, a phenyl group, a biphenyl group, a C.sub.1-C.sub.20 alkylphenyl group, or a naphthyl group.

[0108] When b11 is 2, two R.sub.10A(s) may be identical to or different from each other, when b12 is 2, two R.sub.10B(s) may be identical to or different from each other, and when b20 is 2 or greater, at least two R.sub.20(s) may be identical to or different from each other.

[0109] In Formula 1-1, at least two of R.sub.10A(s); at least two of R.sub.10B(s); or at least two of R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 may optionally be bound to form a substituted or unsubstituted C.sub.5-C.sub.30 carbocyclic group or a substituted or unsubstituted C.sub.1-C.sub.30 heterocyclic group.

[0110] In one or more embodiments, at least two of R.sub.10A(s); at least two of R.sub.10B(s); or at least two of R.sub.10A, R.sub.10B, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44(s) may optionally be bound to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10C or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10C (e.g., a fluorene group, a xanthene group, or an acridine group unsubstituted or substituted with at least one R.sub.10C) via a single bond, a double bond, or a first linking group. Rift may be understood by referring to the description of R.sub.10a provided herein.

[0111] The first linking group may be one or more of *—N(R.sub.8)—*′, *—B(R.sub.8)—*′, *—P(R.sub.8)—*′, *—C(R.sub.8)(R.sub.9)—*′, *—Si(R.sub.8)(R.sub.9)—*′, *—Ge(R.sub.8)(R.sub.9)—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O).sub.2—*′, *—C(R.sub.8)═*′, *═C(R.sub.8)—*′, *—C(R.sub.8)═C(R.sub.9)—*′, *—C(═S)—*′, or *—C≡C—*′, wherein R.sub.8 and R.sub.9 may each be understood by referring to the description of R.sub.10A provided herein, and * and *′ may each be a binding site to an adjacent atom.

[0112] In one or more embodiments, the organometallic compound may be a compound represented by one or more of Formulae 31-1 to 31-8:

##STR00059## ##STR00060## ##STR00061## ##STR00062##

wherein, in Formulae 31-1 to 31-8,

[0113] M.sub.1, n1, n2, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 may be understood by referring to the descriptions of M.sub.1, n1, n2, R.sub.21 to R.sub.28, R.sub.31 to R.sub.37, and R.sub.41 to R.sub.44 provided herein,

[0114] X.sub.1 may be O, S, Se, N(R.sub.15), or C(R.sub.15)(R.sub.16), and

[0115] R.sub.11 to R.sub.16 may each independently be understood by referring to the description of R.sub.10A provided herein.

[0116] In one or more embodiments, the organometallic compound may be electrically neutral.

[0117] In one or more embodiments, the organometallic compound may be one or more of Compounds 1 to 25:

##STR00063## ##STR00064## ##STR00065## ##STR00066## ##STR00067## ##STR00068## ##STR00069##

[0118] The organometallic compound represented by Formula 1 has ligands represented by Formula 1-1, Formula 2-1, Formula 2-2, or a combination thereof. The ligand represented by Formula 1-1 may have a lowest unoccupied molecular orbital (LUMO) ring of a structure in which a 5-membered ring represented by CY.sub.11 and a 6-membered ring represented by CY.sub.12 may be condensed and a lowest unoccupied molecular orbital (LUMO) ring of a phenanthrene structure. Accordingly, the conjugation structure may be longer, and stability and optical orientation of molecules may be improved. In addition, the ligand may be represented by Formula 2-1, Formula 2-2, or a combination thereof: Thus, an electronic device, e.g., an organic light-emitting device, including the organometallic compound represented by Formula 1 may have a low driving voltage, high efficiency, long lifespan, and a full width at half maximum (FWHM).

[0119] The highest occupied molecular orbital (HOMO) energy level, the lowest unoccupied molecular orbital LUMO energy level, the lowest singlet excited state (S.sub.1) energy level, and the lowest triplet excited state (T.sub.1) energy level of selected organometallic compounds represented by Formula 1 were evaluated by density functional theory (DFT) using a Gaussian 09 program that performs molecular structure optimizations at a degree of B3LYP. The results thereof are shown in Table 1, where the energy levels are listed in electron Volts (eV).

TABLE-US-00001 TABLE 1 HOMO LUMO S.sub.1 T.sub.1 Compound (eV) (eV) (eV) (eV) Compound 5 −4.601 −1.664 2.332 2.171 Compound 25 −4.563 −1.754 2.232 2.085 Compound 13 −4.619 −2.008 2.089 1.976

##STR00070##

[0120] Referring to the results of Table 1, the organometallic compounds represented by Formula 1, as exemplified by the organometallic compounds of Formulae 5, 13, and 25, were found to have suitable electrical characteristics for use as a dopant in an electronic device, e.g., an organic light-emitting device.

[0121] In one or more embodiments, a full width at half maximum (FWHM) in the photoluminescence spectrum or electroluminescence spectrum of the organometallic compound may be about 75 nanometers (nm) or less. For example, a FWHM in the photoluminescence spectrum or electroluminescence spectrum of the organometallic compound may be in a range of about 30 nm to about 75 nm, about 40 nm to about 70 nm, or about 45 nm to about 68 nm.

[0122] In one or more embodiments, a maximum emission wavelength (emission peak wavelength, λ.sub.max) in the photoluminescence spectrum or electroluminescence spectrum of the organometallic compound may be in a range of about 600 nm to about 750 nm.

[0123] A method of synthesizing the organometallic compounds represented by Formula 1 may be apparent to one of ordinary skill in the art based on knowledge in the art and by referring to the Synthesis Examples provided herein.

[0124] The organometallic compound represented by Formula 1 may be suitable for use in an organic layer of an organic light-emitting device, e.g., as a dopant in an emission layer of the organic layer. Thus, according to another aspect, there is provided an organic light-emitting device that includes a first electrode; a second electrode; and an organic layer located (i.e., disposed) between the first electrode and the second electrode, wherein the organic layer includes an emission layer, and wherein the organic layer further includes at least one organometallic compound represented by Formula 1.

[0125] The organic light-emitting device includes an organic layer including one or more of the organometallic compounds represented by Formula 1. Thus, the organic light-emitting device may have an excellent driving voltage, an excellent current efficiency, an excellent external quantum efficiency, an excellent roll-off ratio, a relatively short full width at half maximum (FWHM) of an emission peak in an electroluminescent (EL) spectrum, and excellent lifespan characteristics.

[0126] The organometallic compound represented by Formula 1 may be used in a pair of electrodes of an organic light-emitting device. For example, the organometallic compound represented by Formula 1 may be included in the emission layer. In this embodiment, the organometallic compound may serve as a dopant and the emission layer may further include a host (that is, an amount of the organometallic compound represented by Formula 1 may be smaller than that of the host in the emission layer).

[0127] In one or more embodiments, the emission layer may emit red light. In one or more embodiments, the emission layer may emit red light having a maximum emission wavelength (λ.sub.max) in a range of about 600 nanometers (nm) to about 750 nm.

[0128] As used herein, “(for example, the organic layer) including at least one organometallic compound” means that “(the organic layer) including an organometallic compound of Formula 1, or at least two different organometallic compounds of Formula 1”.

[0129] For example, Compound 1 may only be included in the organic layer as an organometallic compound. In this embodiment, Compound 1 may be included in the emission layer of the organic light-emitting device. In one or more embodiments, Compounds 1 and 2 may be included in the organic layer as organometallic compounds. In this embodiment, Compounds 1 and 2 may both be included in the same layer (for example, both Compounds 1 and 2 may be included in the emission layer).

[0130] The first electrode may be an anode, which is a hole injection electrode, and the second electrode may be a cathode, which is an electron injection electrode. In one or more embodiments, the first electrode may be a cathode, which is an electron injection electrode, and the second electrode may be an anode, which is a hole injection electrode.

[0131] For example, in the organic light-emitting device, the first electrode may be an anode, the second electrode may be a cathode, and the organic layer may further include a hole transport region between the first electrode and the emission layer and an electron transport region between the emission layer and the second electrode, wherein the hole transport region may include a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or a combination thereof, and the electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof.

[0132] The term “organic layer” as used herein refers to a single and/or a plurality of layers between the first electrode and the second electrode in an organic light-emitting device. The “organic layer” may include not only organic compounds but also organometallic complexes including metals.

[0133] FIGURE illustrates a schematic cross-sectional view of an organic light-emitting device 10 according to one or more embodiments. Hereinafter, a structure of an organic light-emitting device according to one or more embodiments and a method of manufacturing the organic light-emitting device will be described with reference to the FIGURE. The organic light-emitting device 10 may include a first electrode 11, an organic layer 15, and a second electrode 19, which may be sequentially layered in this stated order.

[0134] A substrate may be additionally disposed under the first electrode 11 or on the second electrode 19. The substrate may be a conventional substrate used in organic light-emitting devices, e.g., a glass substrate, a transparent plastic substrate, or the like, each having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water repellency.

[0135] The first electrode 11 may be produced, for example, by depositing or sputtering, onto the substrate, a material for forming the first electrode 11. The first electrode 11 may be an anode. The material for forming the first electrode 11 may be chosen from materials with a high work function for easier hole injection. The first electrode 11 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. The material for forming the first electrode 11 may be indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO.sub.2), or zinc oxide (ZnO). In one or more embodiments, the material for forming the first electrode 11 may be a metal, such as magnesium (Mg), aluminum (Al), silver (Ag), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag).

[0136] The first electrode 11 may have a single-layered structure or a multi-layered structure including a plurality of layers. In one or more embodiments, the first electrode 11 may have a triple-layered structure of ITO/Ag/ITO, but embodiments are not limited thereto.

[0137] The organic layer 15 may be on the first electrode 11. For example, the organic layer 15 may be disposed on or located on the first electrode 11.

[0138] In one or more embodiments, the organic layer 15 may include a hole transport region, an emission layer, and an electron transport region.

[0139] The hole transport region may be located between the first electrode 11 and the emission layer.

[0140] The hole transport region may include a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or a combination thereof.

[0141] The hole transport region may include a hole injection layer only or a hole transport layer only. In one or more embodiments, the hole transport region may include a hole injection layer and a hole transport layer that are sequentially stacked on the first electrode 11. In one or more embodiments, the hole transport region may include a hole injection layer, a hole transport layer, and an electron blocking layer, which are sequentially stacked on the first electrode 11 in the stated order.

[0142] When the hole transport region includes a hole injection layer, the hole injection layer may be formed on the first electrode 11 by using one or more suitable methods, such as vacuum deposition, spin coating, casting, and Langmuir-Blodgett (L-B) deposition.

[0143] When a hole injection layer is formed by vacuum deposition, for example, the vacuum deposition may be performed at a deposition temperature in a range of about 100° C. to about 500° C., at a vacuum degree in a range of about 10.sup.−8 torr to about 10.sup.−3 torr, and at a deposition rate in a range of about 0.01 Angstroms per second (Å/sec) to about 100 Å/sec, though the conditions may vary depending on a compound that is used as a hole injection material and a structure and thermal properties of a desired hole injection layer, but conditions for the vacuum deposition are not limited thereto.

[0144] When a hole injection layer is formed by spin coating, the spin coating may be performed at a coating rate in a range of about 2,000 revolutions per minute (rpm) to about 5,000 rpm, and at a temperature in a range of about 80° C. to about 200° C., to facilitate removal of a solvent after the spin coating, though the conditions may vary depending on a compound that is used as a hole injection material and a structure and thermal properties of a desired hole injection layer, but conditions for the spin coating are not limited thereto.

[0145] The conditions for forming a hole transport layer and an electron blocking layer may be inferred from the conditions for forming the hole injection layer.

[0146] The hole transport region may include at least one of 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA), 4,4′,4″-tris(N,N-diphenylamino)triphenylamine (TDATA), 4,4′,4″-tris{N-(2-naphthyl)-N-phenylamino}-triphenylamine (2-TNATA), N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB), β-NPB, N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1-biphenyl]-4,4′-diamine (TPD), spiro-TPD, spiro-NPB, methylated NPB, 4,4′-cyclohexylidene bis[N,N-bis(4-methylphenyl)benzenamine] (TAPC), 4,4′-bis[N, N′-(3-tolyl)amino]-3,3′-dimethylbiphenyl (HMTPD), 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (PANI/CSA), (polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), a compound represented by Formula 201, or a compound represented by Formula 202:

##STR00071## ##STR00072## ##STR00073## ##STR00074##

wherein, in Formula 201, Ar.sub.101 and Ar.sub.102 may each independently be:

[0147] a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an acenaphthylene group, a fluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, or a pentacenylene group; and a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an acenaphthylene group, a fluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, or a pentacenylene group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, a C.sub.1-C.sub.60 alkylthio group, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.7-C.sub.60 aryl alkyl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.2-C.sub.60 heteroaryl alkyl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed heteropolycyclic group, or a combination thereof.

[0148] In Formula 201, xa and xb may each independently be an integer from 0 to 5. In one or more embodiments, xa and xb may each independently be 0, 1, or 2. In one or more embodiments, xa may be 1, and xb may be 0, but embodiments are not limited thereto.

[0149] In Formulae 201 and 202, R.sub.101 to R.sub.108, R.sub.111 to R.sub.119, and R.sub.121 to R.sub.124 may each independently be:

[0150] hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.10 alkyl group (e.g., a methyl group, an ethyl group, a propyl group, a butyl group, pentyl group, or a hexyl group), a C.sub.1-C.sub.10 alkoxy group (e.g., a methoxy group, an ethoxy group, a propoxy group, a butoxy group, or a pentoxy group), or a C.sub.1-C.sub.10 alkylthio group;

[0151] a C.sub.1-C.sub.10 alkyl group, a C.sub.1-C.sub.10 alkoxy group, or a C.sub.1-C.sub.10 alkylthio group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, or a phosphoric acid group or a salt thereof;

[0152] a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, or a pyrenyl group; or

[0153] a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, or a pyrenyl group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.10 alkyl group, a C.sub.1-C.sub.10 alkoxy group, or a C.sub.1-C.sub.10 alkylthio group, but embodiments are not limited thereto.

[0154] In Formula 201, R.sub.109 may be:

[0155] a phenyl group, a naphthyl group, an anthracenyl group, or a pyridinyl group; and

[0156] a phenyl group, a naphthyl group, an anthracenyl group, or a pyridinyl group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.20 alkyl group, a C.sub.1-C.sub.20 alkoxy group, a C.sub.1-C.sub.20 alkylthio group, a phenyl group, a naphthyl group, an anthracenyl group, or a pyridinyl group.

[0157] In one or more embodiments, the compound represented by Formula 201 may be represented by Formula 201A, but embodiments are not limited thereto:

##STR00075##

wherein, in Formula 201A, R.sub.101, R.sub.111, R.sub.112, and R.sub.109 may be understood by referring to the descriptions of R.sub.101, R.sub.111, R.sub.112, and R.sub.109 provided herein.

[0158] In one or more embodiments, the compounds represented by Formulae 201 and 202 may include one or more of Compounds HT1 to HT20, but embodiments are not limited thereto:

##STR00076## ##STR00077## ##STR00078## ##STR00079## ##STR00080## ##STR00081##

[0159] The thickness of the hole transport region may be in a range of about 100 (Angstroms) Å to about 10,000 Å, and in one or more embodiments, about 100 Å to about 1,000 Å. When the hole transport region includes at least one of a hole injection layer and a hole transport layer, the thickness of the hole injection layer may be in a range of about 100 Å to about 10,000 Å, and in one or more embodiments, about 100 Å to about 1,000 Å, and the thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å, and in one or more embodiments, about 100 Å to about 1,500 Å. When the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer are within any of these ranges, excellent hole transport characteristics may be obtained without a substantial increase in driving voltage.

[0160] The hole transport region may include a charge generating material as well as the aforementioned materials, to improve conductive properties of the hole transport region. The charge generating material may be substantially homogeneously or non-homogeneously dispersed in the hole transport region.

[0161] The charge generating material may include, for example, a p-dopant. The p-dopant may include one of a quinone derivative, a metal oxide, and a compound containing a cyano group, but embodiments are not limited thereto. For example, non-limiting examples of the p-dopant include a quinone derivative, such as tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ), or F6-TCNNQ; a metal oxide, such as a tungsten oxide or a molybdenum oxide; or a compound containing a cyano group, such as Compound HT-D1 or Compound F12, but embodiments are not limited thereto:

##STR00082##

[0162] The hole transport region may further include a buffer layer.

[0163] The buffer layer may compensate for an optical resonance distance depending on a wavelength of light emitted from the emission layer to improve the efficiency of an organic light-emitting device.

[0164] An emission layer may be formed on the hole transport region by using one or more suitable methods, such as vacuum deposition, spin coating, casting, or LB deposition. When the emission layer is formed by vacuum deposition or spin coating, vacuum deposition and coating conditions for forming the emission layer may be generally similar to those conditions for forming a hole injection layer, though the conditions may vary depending on a compound that is used.

[0165] When the hole transport region includes an electron blocking layer, a material for forming the electron blocking layer may be selected from the materials for forming a hole transport region and host materials described herein, but embodiments are not limited thereto. In one or more embodiments, when the hole transport region includes an electron blocking layer, mCP described herein may be used for forming the electron blocking layer.

[0166] The emission layer may include a host and a dopant, and the dopant may include the organometallic compound represented by Formula 1.

[0167] The host may include at least one of 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi), 3-tert-butyl-9,10-di(naphth-2-yl)anthracene (TBADN), 9,10-di(naphthalene-2-yl)anthracene (ADN, also known as “DNA”), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), 4,4′-bis(9-carbazolyl)-2,2′-dimethyl-biphenyl (CDBP), TCP, mCP, or Compounds H50 or H51:

##STR00083## ##STR00084##

[0168] In one or more embodiments, the host may further include a compound represented by Formula 301:

##STR00085##

wherein, in Formula 301, Ar.sub.111 and Ar.sub.112 may each independently be:

[0169] a phenylene group, a naphthylene group, a phenanthrenylene group, or a pyrenylene group; or

[0170] a phenylene group, a naphthylene group, a phenanthrenylene group, or a pyrenylene group, each substituted with at least one of a phenyl group, a naphthyl group an anthracenyl group, or a combination thereof.

[0171] In Formula 301, Ar.sub.113 to Ar.sub.116 may each independently be:

[0172] a C.sub.1-C.sub.10 alkyl group, a phenyl group, a naphthyl group, a phenanthrenyl group, or a pyrenyl group; or

[0173] a phenyl group, a naphthyl group, a phenanthrenyl group, or a pyrenyl group, each substituted with at least one of a phenyl group, a naphthyl group, or an anthracenyl group.

[0174] In Formula 301, g, h, i, and j may each independently be an integer from 0 to 4. In one or more embodiments, g, h, i, and j may each independently be 0, 1, or 2.

[0175] In Formula 301, Ar.sub.113 to Ar.sub.116 may each independently be:

[0176] a C.sub.1-C.sub.10 alkyl group substituted with at least one of a phenyl group, a naphthyl group, an anthracenyl group, or a combination thereof;

[0177] a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, or a fluorenyl group;

[0178] a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, or a fluorenyl group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an am idino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, a C.sub.1-C.sub.60 alkylthio group, a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, a fluorenyl group, or a combination thereof; or

##STR00086##

but embodiments are not limited thereto.

[0179] In one or more embodiments, the host may include a compound represented by Formula 302:

##STR00087##

[0180] In Formula 302, Ar.sub.122 to Ar.sub.125 may each be understood by referring to the description of Ar.sub.113 in Formula 301.

[0181] In Formula 302, Ar.sub.126 and Ar.sub.127 may each independently be a C.sub.1-C.sub.10 alkyl group, e.g., a methyl group, an ethyl group, or a propyl group.

[0182] In Formula 302, k and l may each independently be an integer from 0 to 4. In one or more embodiments, k and l may each be 0, 1, or 2.

[0183] When the organic light-emitting device 10 is a full-color organic light-emitting device, the emission layer may be patterned into a red emission layer, a green emission layer, and a blue emission layer. In one or more embodiments, the emission layer may have a structure in which the red emission layer, the green emission layer, and/or the blue emission layer are layered to emit white light. In one or more embodiments, the structure of the emission layer may vary.

[0184] When the emission layer includes the host and the dopant, an amount of the dopant may be selected from a range of about 0.01 parts to about 15 parts by weight based on about 100 parts by weight of the host, but embodiments are not limited thereto.

[0185] The thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å, and in one or more embodiments, about 200 Å to about 600 Å. When the thickness of the emission layer is within any of these ranges, improved luminescence characteristics may be obtained without a substantial increase in driving voltage.

[0186] Next, an electron transport region may be formed on the emission layer.

[0187] The electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof.

[0188] In one or more embodiments, the electron transport region may have a hole blocking layer/an electron transport layer/an electron injection layer structure or an electron transport layer/an electron injection layer structure, but embodiments are not limited thereto. The electron transport layer may have a single-layered structure or a multi-layered structure including two or more different materials.

[0189] The conditions for forming a hole blocking layer, an electron transport layer, and an electron injection layer may be inferred based on the conditions for forming the hole injection layer.

[0190] When the electron transport region includes a hole blocking layer, the hole blocking layer may include, for example, at least one of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), or bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (Balq), but embodiments are not limited thereto:

##STR00088##

[0191] The thickness of the hole blocking layer may be in a range of about 20 Å to about 1,000 Å, and in one or more embodiments, about 30 Å to about 300 Å. When the thickness of the hole blocking layer is within any of these ranges, excellent hole blocking characteristics may be obtained without a substantial increase in driving voltage.

[0192] The electron transport layer may further include at least one of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), tris(8-hydroxyquinolinato)aluminum (Alq.sub.3), bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (Balq), 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), or 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ):

##STR00089##

[0193] In one or more embodiments, the electron transport layer may include at least one of Compounds ET1 to ET25, but embodiments are not limited thereto:

##STR00090## ##STR00091## ##STR00092## ##STR00093## ##STR00094## ##STR00095## ##STR00096## ##STR00097##

[0194] The thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, and in one or more embodiments, about 150 Å to about 500 Å. When the thickness of the electron transport layer is within any of these ranges, excellent electron transport characteristics may be obtained without a substantial increase in driving voltage.

[0195] The electron transport layer may further include a material containing metal, in addition to the materials described above.

[0196] The material containing metal may include a Li complex. The Li complex may include, e.g., Compound ET-D1 (LiQ) or Compound ET-D2:

##STR00098##

[0197] The electron transport region may include an electron injection layer that facilitates electron injection from the second electrode 19.

[0198] The electron injection layer may include at least one of LiF, NaCl, CsF, Li.sub.2O, or BaO.

[0199] The thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å, for example, about 3 Å to about 90 Å. When the thickness of the electron injection layer is within any of these ranges, excellent electron injection characteristics may be obtained without a substantial increase in driving voltage.

[0200] The second electrode 19 may be on (e.g., disposed on or located on) the organic layer 15. The second electrode 19 may be a cathode. A material for forming the second electrode 19 may be a material with a relatively low work function, such as a metal, an alloy, an electrically conductive compound, and a mixture thereof. Examples of the material for forming the second electrode 19 may include lithium (Li), magnesium (Mg), aluminum (Al), silver (Ag), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag). In one or more embodiments, ITO or IZO may be used to form a transmissive second electrode 19 to manufacture a top emission light-emitting device. In one or more embodiments, the material for forming the second electrode 19 may vary.

[0201] Hereinbefore the organic light-emitting device 10 has been described with reference to the FIGURE, but embodiments are not limited thereto.

[0202] According to an aspect of still another embodiment, a diagnostic composition may include at least one organometallic compound represented by Formula 1.

[0203] Since the organometallic compound represented by Formula 1 provides high luminescence efficiency, the diagnostic efficiency of the diagnostic composition that includes the organometallic compound represented by Formula 1 may be excellent.

[0204] The diagnostic composition may be applied in various ways, such as in a diagnostic kit, a diagnostic reagent, a biosensor, or a biomarker.

[0205] The term “C.sub.1-C.sub.60 alkyl group” as used herein refers to a linear or branched saturated aliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms. Examples thereof include a methyl group, an ethyl group, a propyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group. The term “C.sub.1-C.sub.60 alkylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.1-C.sub.60 alkyl group.

[0206] The term “C.sub.1-C.sub.60 alkoxy group” as used herein refers to a monovalent group represented by —OA.sub.101 (wherein A.sub.101 is a C.sub.1-C.sub.60 alkyl group). Examples thereof include a methoxy group, an ethoxy group, and an isopropyloxy group. The term “C.sub.1-C.sub.60 alkylthio group” as used herein refers to a monovalent group represented by —SA.sub.101 (wherein A.sub.101 is a C.sub.1-C.sub.60 alkyl group).

[0207] The term “C.sub.2-C.sub.60 alkenyl group” as used herein refers to a group formed by including at least one carbon-carbon double bond in the middle or at the terminus of the C.sub.2-C.sub.60 alkyl group. Examples thereof include an ethenyl group, a propenyl group, and a butenyl group. The term “C.sub.2-C.sub.60 alkenylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.2-C.sub.60 alkenyl group.

[0208] The term “C.sub.2-C.sub.60 alkynyl group” as used herein refers to a group formed by including at least one carbon-carbon triple bond in the middle or at the terminus of the C.sub.2-C.sub.60 alkyl group. Examples thereof include an ethenyl group and a propenyl group. The term “C.sub.2-C.sub.60 alkynylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.2-C.sub.60 alkynyl group.

[0209] The term “C.sub.3-C.sub.10 cycloalkyl group” as used herein refers to a monovalent monocyclic saturated hydrocarbon group including 3 to 10 carbon atoms. Examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. The term “C.sub.3-C.sub.10 cycloalkylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.3-C.sub.10 cycloalkyl group.

[0210] The term “C.sub.1-C.sub.10 heterocycloalkyl group” as used herein refers to a monovalent monocyclic group including at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom and 1 to 10 carbon atoms. Examples thereof include a tetrahydrofuranyl group and a tetrahydrothiophenyl group. The term “C.sub.1-C.sub.10 heterocycloalkylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.1-C.sub.10 heterocycloalkyl group.

[0211] The term “C.sub.3-C.sub.10 cycloalkenyl group” as used herein refers to a monovalent monocyclic group including 3 to 10 carbon atoms and at least one carbon-carbon double bond in its ring, wherein the molecular structure as a whole is non-aromatic. Examples thereof include a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. The term “C.sub.3-C.sub.10 cycloalkenylene group” as used herein refers to a divalent group having substantially the same structure as the C.sub.3-C.sub.10 cycloalkenyl group.

[0212] The term “C.sub.1-C.sub.10 heterocycloalkenyl group” as used herein refers to a monovalent monocyclic group including at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least one double bond in its ring. Examples of the C.sub.1-C.sub.10 heterocycloalkenyl group include a 2,3-dihydrofuranyl group and a 2,3-dihydrothiophenyl group. The term “C.sub.1-C.sub.10 heterocycloalkylene group” as used herein refers to a divalent group having substantially the same structure as the heterocycloalkenyl group.

[0213] The term “C.sub.6-C.sub.60 aryl group” as used herein refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. The term “C.sub.6-C.sub.60 arylene group” as used herein refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Examples of the C.sub.6-C.sub.60 aryl group include a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and a chrysenyl group. When the C.sub.6-C.sub.60 aryl group and a C.sub.6-C.sub.60 arylene group each include at least two rings, the at least two rings may be fused.

[0214] The term “C.sub.7-C.sub.60 alkyl aryl group” as used herein refers to a C.sub.6-C.sub.60 aryl group substituted with at least one C.sub.1-C.sub.60 alkyl group. The term “C.sub.7-C.sub.60 aryl alkyl group” as used herein refers to a C.sub.1-C.sub.60 alkyl group substituted with at least one C.sub.6-C.sub.60 aryl group.

[0215] The term “C.sub.1-C.sub.60 heteroaryl group” as used herein refers to a monovalent group having a heterocyclic aromatic system having at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom and 1 to 60 carbon atoms. The term “C.sub.1-C.sub.60 heteroarylene group” as used herein refers to a divalent group having a heterocyclic aromatic system having at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom and 1 to 60 carbon atoms. Examples of the C.sub.1-C.sub.60 heteroaryl group include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group. When the C.sub.1-C.sub.60 heteroaryl group and the C.sub.1-C.sub.60 heteroarylene group each include at least two rings, the at least two rings may be fused.

[0216] The term “C.sub.2-C.sub.60 alkyl heteroaryl group” as used herein refers to a C.sub.1-C.sub.60 heteroaryl group substituted with at least one C.sub.1-C.sub.60 alkyl group. The term “C.sub.2-C.sub.60 heteroaryl alkyl group” as used herein refers to a C.sub.1-C.sub.60 alkyl group substituted with at least one C.sub.1-C.sub.60 heteroaryl group.

[0217] The term “C.sub.6-C.sub.60 aryloxy group” as used herein refers to —OA.sub.102 (wherein A.sub.102 is a C.sub.6-C.sub.60 aryl group). The term “C.sub.6-C.sub.60 arylthio group” as used herein refers to —SA.sub.103 (wherein A.sub.103 is a C.sub.6-C.sub.60 aryl group).

[0218] The term “C.sub.1-C.sub.60 heteroaryloxy group” as used herein refers to —OA.sub.102′ (wherein A.sub.102′ is a C.sub.1-C.sub.60 heteroaryl group). The term “C.sub.1-C.sub.60 heteroarylthio group” as used herein refers to —SA.sub.103, (wherein A.sub.103, is a C.sub.1-C.sub.60 heteroaryl group).

[0219] The term “monovalent non-aromatic condensed polycyclic group” as used herein refers to a monovalent group that has two or more condensed rings and only carbon atoms (e.g., the number of carbon atoms may be in a range of 8 to 60) as ring-forming atoms, wherein the molecular structure as a whole is non-aromatic. Examples of the monovalent non-aromatic condensed polycyclic group include a fluorenyl group. The term “divalent non-aromatic condensed polycyclic group” as used herein refers to a divalent group having substantially the same structure as the monovalent non-aromatic condensed polycyclic group.

[0220] The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein refers to a monovalent group that has two or more condensed rings and a heteroatom selected from N, O, P, Si, and S and carbon atoms (e.g., the number of carbon atoms may be in a range of 1 to 60) as ring-forming atoms, wherein the molecular structure as a whole is non-aromatic. Examples of the monovalent non-aromatic condensed heteropolycyclic group include a carbazolyl group. The term “divalent non-aromatic condensed heteropolycyclic group” as used herein refers to a divalent group having substantially the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

[0221] The term “C.sub.5-C.sub.30 carbocyclic group” as used herein refers to a saturated or unsaturated cyclic group including 5 to 30 carbon atoms only as ring-forming atoms. The C.sub.5-C.sub.30 carbocyclic group may be a monocyclic group or a polycyclic group.

[0222] The term “C.sub.1-C.sub.30 heterocyclic group” as used herein refers to saturated or unsaturated cyclic group including 1 to 30 carbon atoms and at least one heteroatom selected from N, O, P, Si, and S as ring-forming atoms. The C.sub.1-C.sub.30 heterocyclic group may be a monocyclic group or a polycyclic group.

[0223] At least one substituent of the substituted C.sub.5-C.sub.30 carbocyclic group, the substituted C.sub.1-C.sub.30 heterocyclic group, the substituted C.sub.1-C.sub.60 alkyl group, the substituted C.sub.2-C.sub.60 alkenyl group, the substituted C.sub.2-C.sub.60 alkynyl group, the substituted C.sub.1-C.sub.60 alkoxy group, the substituted C.sub.1-C.sub.60 alkylthio group, the substituted C.sub.3-C.sub.10 cycloalkyl group, the substituted C.sub.1-C.sub.10 heterocycloalkyl group, the substituted C.sub.3-C.sub.10 cycloalkenyl group, the substituted C.sub.1-C.sub.10 heterocycloalkenyl group, the substituted C.sub.6-C.sub.60 aryl group, the substituted C.sub.7-C.sub.60 alkyl aryl group, the substituted C.sub.7-C.sub.60 aryl alkyl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.6-C.sub.60 arylthio group, the substituted CI-Coo heteroaryl group, the substituted C.sub.2-C.sub.60 alkyl heteroaryl group, the substituted C.sub.2-C.sub.60 heteroaryl alkyl group, the substituted C.sub.1-C.sub.60 heteroaryloxy group, the substituted CI-Coo heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be:

[0224] deuterium, —F, —Cl, —Br, —I, —SF.sub.5, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, or a C.sub.1-C.sub.60 alkylthio group;

[0225] a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, or a C.sub.1-C.sub.60 alkylthio group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —SF.sub.5, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q.sub.11)(Q.sub.12), —Si(Q.sub.13)(Q.sub.14)(Q.sub.15), —B(Q.sub.16)(Q.sub.17), —P(Q.sub.18)(Q.sub.19), or —P(═O)(Q.sub.18)(Q.sub.19);

[0226] a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group;

[0227] a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD.sub.3, —CD.sub.2H, —CDH.sub.2, —CF.sub.3, —CF.sub.2H, —CFH.sub.2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.60 alkoxy group, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.7-C.sub.60 aryl alkyl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.2-C.sub.60 heteroaryl alkyl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q.sub.21)(Q.sub.22), —Si(Q.sub.23)(Q.sub.24)(Q.sub.25), —B(Q.sub.26)(Q.sub.27), —P(Q.sub.28)(Q.sub.29), or —P(═O)(Q.sub.28)(Q.sub.29); or

[0228] —N(Q.sub.31)(Q.sub.32), —Si(Q.sub.33)(Q.sub.34)(Q.sub.35), —B(Q.sub.36)(Q.sub.37), —P(Q.sub.38)(Q.sub.39), or —P(═O)(Q.sub.38)(Q.sub.39),

[0229] wherein Q.sub.1 to Q.sub.9, Q.sub.11 to Q.sub.19, Q.sub.21 to Q.sub.29, and Q.sub.31 to Q.sub.39 may each independently be hydrogen, deuterium, —F, —Cl, —Br, —I, —SF.sub.5, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C.sub.1-C.sub.60 alkyl group, a C.sub.2-C.sub.60 alkenyl group, a C.sub.2-C.sub.60 alkynyl group, a C.sub.1-C.sub.60 alkoxy group, a C.sub.1-C.sub.60 alkylthio group, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, a C.sub.1-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkyl aryl group, a C.sub.7-C.sub.60 aryl alkyl group, a C.sub.6-C.sub.60 aryloxy group, a C.sub.6-C.sub.60 arylthio group, a C.sub.1-C.sub.60 heteroaryl group, a C.sub.2-C.sub.60 alkyl heteroaryl group, a C.sub.2-C.sub.60 heteroaryl alkyl group, a C.sub.1-C.sub.60 heteroaryloxy group, a C.sub.1-C.sub.60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each of which is unsubstituted or substituted with at least one of deuterium, a C.sub.1-C.sub.60 alkyl group, a C.sub.6-C.sub.60 aryl group, or a combination thereof.

[0230] Hereinafter, an exemplary compound and an organic light-emitting device according to one or more exemplary embodiments will be described in further detail with reference to Synthesis Examples and Examples, however, the present disclosure is not limited thereto. The wording “B was used instead of A” used in describing Synthesis Examples means that an identical molar equivalent of B was used in place of A.

EXAMPLES

Synthesis Example 1: Synthesis of Compound 1

[0231] ##STR00099## ##STR00100##

(1) Synthesis of Compound 1A

[0232] In a nitrogen atmosphere, 1.0 gram (g) (4.4 millimole (mmol)) of 7-bromo-2-methylthieno[2,3-c]pyridine and 1.5 g (4.8 mmol) of 4,4,5,5-tetramethyl-2-(phenanthren-2-yl)-1,3,2-dioxoborane were dissolved in 95 milliliters (mL) of 1,4-dioxane. Then, 1.4 g (13.2 mmol) of potassium carbonate (K.sub.2CO.sub.3) was dissolved in 31 mL of deionize (DI) water, followed by addition of the reaction mixture and 0.25 g (0.22 mmol) of a palladium catalyst (Pd(PPh.sub.3).sub.4). Then, the resulting mixture was stirred at 100° C. under reflux. The resulting solid underwent column chromatography (eluent: methylene chloride (MC) and hexanes) to thereby obtain 1.3 g of 2-methyl-7-(phenanthren-2-yl)thieno[2,3-c]pyridine (yield: 88%). The resulting compound was identified by using high resolution mass spectroscopy (HRMS) using matrix assisted laser desorption ionization (MALDI) and HPLC analysis.

[0233] HRMS (MALDI) calcd for C.sub.22H.sub.15NS: m/z: 325.43 Found: 326.14.

(2) Synthesis of Compound 1B

[0234] 1.03 g (3.83 mmol) of Compound 1A and 0.6 g (1.70 mmol) of iridium chloride were mixed with 30 mL of ethoxyethanol and 10 mL of DI water. Then, the mixture was stirred under reflux for about 24 hours to carry out a reaction, and then the temperature was dropped to room temperature. A solid formed therefrom was separated by filtration. The solid was washed sufficiently with water, methanol, and hexane in the stated order and dried in a vacuum oven to thereby obtain 1.1 g of Compound 1B (yield: 58%). The resulting Compound 1A(1) was used in the following reaction without any further purification.

(3) Synthesis of Compound 1

[0235] 1.1 g (0.64 mmol) of Compound 1B, 0.34 g (1.60 mmol) of 3,7-diethylnonane-4,6-dione, and 0.22 g (1.60 mmol) of K.sub.2CO.sub.3 were mixed with 20 mL of ethoxyethanol, followed by stirring for 24 hours. The resulting solid underwent filtration and column chromatography (eluent: methylene chloride (MC) and hexane) to thereby obtain 0.65 g of Compound 1 (yield: 39%). The resulting compound was identified by using HRMS and HPLC analysis.

[0236] HRMS (MALDI) calcd for C.sub.57H.sub.51IrN.sub.2O.sub.2S.sub.2: m/z: 1052.38 Found: 1053.74.

Example 1

[0237] A glass substrate, on which ITO is patterned as an anode, was cut to a size of 50 millimeters (mm)×50 mm×0.5 mm, sonicated in isopropyl alcohol and DI water for 5 minutes each, and cleaned by exposure to ultraviolet rays and ozone for 30 minutes. Subsequently, the glass substrate was mounted on a vacuum-deposition device.

[0238] Compound HT3 and Compound F12(p-dopant) were co-vacuum-deposited on the anode at a weight ratio of 98:2 to form a hole injection layer having a thickness of 100 Å. Compound HT3 was then vacuum-deposited on the hole injection layer to form a hole transport layer having a thickness of 1,600 Å to thereby form a hole transport layer.

[0239] Subsequently, Compound RH3 (as a host) and Compound 5 (as a dopant) were co-deposited on the hole transport layer at a weight ratio of 97:3 to form an emission layer having a thickness of 400 Å.

[0240] Compound ET3 and LiQ (n-dopant) were co-deposited at a volume ratio of 50:50 on the emission layer to form an electron transport layer having a thickness of 350 Å, LiQ was vacuum-deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, and Al was vacuum-deposited on the electron injection layer to form a cathode having a thickness of 1,000 Å, thereby completing the manufacture of an organic light-emitting device.

##STR00101## ##STR00102##

Examples 2 and 3 and Comparative Examples 1 to 7

[0241] Organic light-emitting devices were manufactured in the same manner as in Example 1, except that the compounds shown in Table 2 were used instead of Compound 1 as a dopant in the formation of an emission layer.

[0242] The driving voltage (Volts, V), roll-off ratio (%), maximum emission wavelength (λ.sub.max, nm) of the emission spectrum, and lifespan (LT.sub.97, relative %) of the organic light-emitting devices manufactured in Examples 1 to 3 and Comparative Examples 1 to 7 were evaluated. The results thereof are shown in Table 2. A Keithley 2400 current voltmeter and a luminance meter (Minolta Cs-1000A) were used in evaluation. The lifespan (LT.sub.97) indicates time (hour) for the luminance of each light-emitting device to decrease to 97% of its initial luminance of 100%. The relative value for LT.sub.97 is determined based on Comparative Example 1 having an LT.sub.97 of 100%. The roll-off ratio was calculated by Equation 20:

Roll-off ratio={1−(efficiency/maximum luminescence efficiency)}×100% Equation 20

TABLE-US-00002 TABLE 2 Driving LT.sub.97 Dopant in voltage Roll-off λ.sub.max (relative No. emission layer (V) (%) (nm) value) Example 1 Compound 5 4.7 12% 588 110% Example 2 Compound 25 4.7 12% 601 135% Example 3 Compound 13 4.6 11% 610 115% Comparative Compound A 4.9 13% 624 100% Example 1 Comparative Compound B 4.9 12% 624 80% Example 2 Comparative Compound C 5.0 14% 580 40% Example 3 Comparative Compound D 5.1 14% 595 40% Example 4 Comparative Compound E 5.2 15% 590 20% Example 5 Comparative Compound F 5.4 16% 585 15% Example 6 Comparative Compound G 4.5 15% 535 10% Example 7

##STR00103## ##STR00104## ##STR00105##

[0243] Referring to the results of Table 2, the organic light-emitting devices of Examples 1 to 3 were each found to have a low driving voltage, a low roll-off ratio, and excellent lifespan characteristics. In addition, the organic light-emitting devices of Examples 1 to 3 were each found to have a driving voltage and a roll-off ratio, which are lower than or equal to those of the organic light-emitting devices of Comparative Examples 1 to 7. In addition, the organic light-emitting devices of Examples 1 to 3 were each found to have a longer lifespan than the organic light-emitting devices of Comparative Examples 1 to 7. The organic light-emitting devices of Examples 1 to 3 were each found to emit red light, unlike the organic light-emitting devices of Comparative Example 7.

[0244] As apparent from the foregoing description, the organometallic compound was found to have excellent electrical characteristics and stability. Accordingly, an electronic device, e.g., an organic light-emitting device, including the organometallic compound may have a low driving voltage, a high efficiency, a long lifespan, a reduced roll-off ratio, and a relatively narrow FWHM of an emission peak in an EL spectrum. Accordingly, by using the organometallic compound, an organic light-emitting device with excellent quality may be realized.

[0245] It should be understood that exemplary embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each exemplary embodiment should typically be considered as available for other similar features or aspects in other exemplary embodiments. While one or more exemplary embodiments have been described with reference to the FIGURE, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.

ORGANOMETALLIC COMPOUND, ORGANIC LIGHT-EMITTING DEVICE INCLUDING ORGANOMETALLIC COMPOUND, AND ELECTRONIC APPARATUS INCLUDING ORGANIC LIGHT-EMITTING DEVICE

Inventors

Cpc classification

Classification Explorer

H10K2101/30

ELECTRICITY

Classification Explorer

H10K50/11

ELECTRICITY

Classification Explorer

C07F15/0033

CHEMISTRY; METALLURGY

Classification Explorer

H10K85/342

ELECTRICITY

Classification Explorer

H10K2101/40

ELECTRICITY

Classification Explorer

H10K2101/10

ELECTRICITY

International classification

Classification Explorer

C07F15/00

CHEMISTRY; METALLURGY

Classification Explorer

H10K85/30

ELECTRICITY

Abstract

Claims

Description