LIGHT-EMITTING DEVICE AND ELECTRONIC APPARATUS INCLUDING THE SAME

Abstract

A light-emitting device and an electronic apparatus including the same, the light-emitting device including a first electrode, a second electrode, and an interlayer arranged between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first compound represented by Formula 1 and a second compound represented by Formula 2:

##STR00001## wherein details of Formulae 1 and 2 are as described herein.

Claims

1. A light-emitting device comprising: a first electrode; a second electrode; and an interlayer arranged between the first electrode and the second electrode and comprising an emission layer, wherein the emission layer comprises a first compound represented by Formula 1 and a second compound represented by Formula 2: ##STR00231## wherein, in Formulae 1, 1A, and 2, CY.sub.11 and CY.sub.12 are each independently a C.sub.5-C.sub.30 carbocyclic group, CY.sub.13 to CY.sub.16, CY.sub.23, and CY.sub.24 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, Y.sub.11 is O, S, or Se, X.sub.21 is N or C(R.sub.21a), X.sub.22 is N or C(R.sub.22a), and X.sub.23 is N or C(R.sub.23a), at least one of X.sub.21 to X.sub.23 is N, L.sub.21 and L.sub.22 are each independently a single bond, a substituted or unsubstituted C.sub.3-C.sub.60 carbocyclic group, or a substituted or unsubstituted C.sub.1-C.sub.60 heterocyclic group, n21 and n22 are each independently an integer from 1 to 5, T.sub.13 and T.sub.14 are each independently a group represented by Formula 1A, a13 and a14 are each independently an integer from 0 to 10, the sum of a13 and a14 is 1 or more, R.sub.11 and R.sub.12 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, 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.2-C.sub.10 heterocycloalkenyl 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.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.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), or —P(═O)(Q.sub.8)(Q.sub.9), R.sub.13 to R.sub.16, R.sub.21 to R.sub.24, R.sub.21a, R.sub.22a, and R.sub.23a are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, 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.2-C.sub.10 heterocycloalkenyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryl 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.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.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), or —P(═O)(Q.sub.8)(Q.sub.9), at least one of R.sub.11 in the number of b11, R.sub.12 in the number of b12, R.sub.13 in the number of b13, R.sub.14 in the number of b14, R.sub.15 in the number of b15, and R.sub.16 in the number of b16 is deuterium, b11 to b16 and b21 to b24 are each independently an integer from 1 to 10, * indicates a binding site to a neighboring atom, 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.2-C.sub.10 heterocycloalkenyl group, the substituted C.sub.6-C.sub.60 aryl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.6-C.sub.60 arylthio group, the substituted C.sub.1-C.sub.60 heteroaryl 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, or a C.sub.1-C.sub.60 alkoxy 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, or a C.sub.1-C.sub.60 alkoxy group, each substituted with 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(Q.sub.11)(Q.sub.12)(Q.sub.13), —N(Q.sub.14)(Q.sub.18), —B(Q.sub.16)(Q.sub.17), —P(═O)(Q.sub.18)(Q.sub.19), or any 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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 monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(═O)(Q.sub.28)(Q.sub.29), or any 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), or —P(═O)(Q.sub.38)(Q.sub.39), and 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, 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.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.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.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 light-emitting device of claim 1, wherein CY.sub.11 and CY.sub.12 are each independently a benzene group or a naphthalene group, and CY.sub.13 to CY.sub.16, CY.sub.23, and CY.sub.24 are each independently a benzene group, a naphthalene group, or a pyridine group.

3. The light-emitting device of claim 1, wherein Formula 1 is represented by one of Formulae 1(1)-1 to 1(1)-4: ##STR00232## wherein, in Formulae 1(1)-1 to 1(1)-4, CY.sub.11, CY.sub.13, CY.sub.14, Y.sub.11, T.sub.13, T.sub.14, a13, a14, R.sub.11 to R.sub.14, b11, b13, and b14 are each as defined in claim 1, and d12 is an integer from 1 to 3.

4. The light-emitting device of claim 1, wherein a moiety represented by ##STR00233## in Formula 1 is a group represented by one of Formulae 1(2)-1 to 1(2)-4: ##STR00234## wherein, in Formulae 1(2)-1 to 1(2)-4, R.sub.13 and R.sub.14 are each as defined in claim 1, d13 is an integer from 1 to 4, and d14 is an integer from 1 to 3, T.sub.15 is defined as in connection with T.sub.14 in claim 1, and * indicates a binding site to a neighboring atom.

5. The light-emitting device of claim 1, wherein Formula 1A is a group represented by one of Formulae 1A-1 to 1A-5: ##STR00235## wherein, in Formulae 1A-1 to 1A-5, R.sub.15 and R.sub.16 are each as defined in claim 1, R.sub.17 and R.sub.18 are each independently defined as in connection with R.sub.15 in claim 1, d15 and d16 are each independently an integer from 1 to 4, d18 is an integer from 1 to 8, and e16 is an integer from 1 to 3.

6. The light-emitting device of claim 1, wherein the sum of a13 and a14 is 1.

7. The light-emitting device of claim 1, wherein R.sub.11 and R.sub.12 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, or a C.sub.1-C.sub.60 alkoxy group; a group represented by one of Formulae 9-1 to 9-61, 9-201 to 9-240, 10-1 to 10-11, 10-211 to 10-304, 10-315 to 10-345, and 10-347 to 10-354; or —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3), or —N(Q.sub.4)(Q.sub.5), R.sub.13 to R.sub.16, R.sub.21 to R.sub.24, R.sub.21a, R.sub.22a, and R.sub.23a 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, or a C.sub.1-C.sub.60 alkoxy group; a group represented by one of Formulae 9-1 to 9-61, 9-201 to 9-240, 10-1 to 10-129, and 10-201 to 10-354; or —Si(Q.sub.1)(Q.sub.2)(Q.sub.3), —Ge(Q.sub.1)(Q.sub.2)(Q.sub.3), or —N(Q.sub.4)(Q.sub.5), and Q.sub.1 to Q.sub.5 are each as defined in claim 1 ##STR00236## ##STR00237## ##STR00238## ##STR00239## ##STR00240## ##STR00241## ##STR00242## ##STR00243## ##STR00244## ##STR00245## ##STR00246## ##STR00247## ##STR00248## ##STR00249## ##STR00250## ##STR00251## ##STR00252## ##STR00253## ##STR00254## ##STR00255## ##STR00256## ##STR00257## ##STR00258## ##STR00259## ##STR00260## ##STR00261## ##STR00262## ##STR00263## ##STR00264## ##STR00265## ##STR00266## ##STR00267## ##STR00268## ##STR00269## ##STR00270## ##STR00271## ##STR00272## ##STR00273## ##STR00274## ##STR00275## ##STR00276## ##STR00277## ##STR00278## ##STR00279## ##STR00280## ##STR00281## ##STR00282## ##STR00283## ##STR00284## ##STR00285## wherein, in Formulae 9-1 to 9-61, 9-201 to 9-240, 10-1 to 10-129, and 10-201 to 10-354, * indicates a binding site to a neighboring atom, “Ph” represents a phenyl group, “TMS” represents a trimethylsilyl group, “TMG” represents a trimethylgermyl group, and “t-Bu” represents a t-butyl group.

8. The light-emitting device of claim 1, wherein the first compound is represented by one of Formulae 1-1 to 1-16: ##STR00286## ##STR00287## ##STR00288## ##STR00289## wherein, in Formulae 1-1 to 1-16, CY.sub.11, CY.sub.13, Y.sub.11, R.sub.11 to R.sub.14, b11, b13, T.sub.13, and a13 are each as defined in claim 1, T.sub.15 is defined as in connection with T.sub.14 in claim 1, d12 is an integer from 1 to 3, and d14 is an integer from 1 to 3.

9. The light-emitting device of claim 1, wherein X.sub.21 to X.sub.23 are each N.

10. The light-emitting device of claim 1, wherein L.sub.21 and L.sub.22 are each independently: a single bond; or a group represented by one of Formulae L-1 to L-12 ##STR00290## ##STR00291## wherein, in Formulae L-1 to L-12, Z.sub.1 to Z.sub.4 are each independently defined as in connection with R.sub.21 in claim 1, c1, c2, and c3 are each independently an integer from 1 to 4, c4 is an integer from 1 to 3, and * and *′ each indicate a binding site to a neighboring atom.

11. The light-emitting device of claim 1, wherein R.sub.21 and R.sub.22 are each independently a C.sub.6-C.sub.60 aryl group unsubstituted or substituted with at least one R.sub.10a, a group represented by Formula 2A, or a group represented by Formula 2B, and R.sub.10a is defined as in connection with R.sub.23 in claim 1: ##STR00292## wherein, in Formulae 2A and 2B, R.sub.25, R.sub.26, and Z.sub.21 to Z.sub.25 are each defined as in connection with R.sub.23 in claim 1, d25 and d26 are each independently an integer from 1 to 4, c21 to c25 are each independently an integer from 1 to 5, L.sub.23 is defined as in connection with L.sub.21 in claim 1, n23 is an integer from 1 to 5, m23 is an integer from 0 to 3, and * indicates a binding site to a neighboring atom.

12. The light-emitting device of claim 1, wherein the first compound is a compound selected from Compounds H1 to H32 in which at least one hydrogen atom is substituted with a deuterium atom, and the second compound is one of Compounds E1 to E39: ##STR00293## ##STR00294## ##STR00295## ##STR00296## ##STR00297## ##STR00298## ##STR00299## ##STR00300## ##STR00301## ##STR00302## ##STR00303## ##STR00304## ##STR00305## ##STR00306## ##STR00307## ##STR00308## ##STR00309## ##STR00310## ##STR00311## ##STR00312## ##STR00313##

13. The light-emitting device of claim 1, wherein the emission layer further comprises a third compound, a fourth compound, or any combination thereof, the third compound comprises a transition metal, and a difference between a triplet energy level and a singlet energy level of the fourth compound is equal to or less than 0.4 eV.

14. The light-emitting device of claim 13, wherein the third compound comprises an organometallic compound represented by Formula 3 or Formula 5: ##STR00314## wherein, in Formula 3, M.sub.31 is a transition metal, X.sub.31 to X.sub.34 are each independently C or N, two bonds of a bond between X.sub.31 and M.sub.31, a bond between X.sub.32 and M.sub.31, a bond between X.sub.33 and M.sub.31, and a bond between X.sub.34 and M.sub.31 are each a coordinate bond, and the other two bonds are each a covalent bond, CY.sub.31 to CY.sub.34 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, L.sub.31 is a single bond, a double bond, *—N(R.sub.35a)—*′, *—B(R.sub.35a)—*′, *—P(R.sub.35a)—*′, *—C(R.sub.35a)(R.sub.35b)—*′, *—Si(R.sub.35a)(R.sub.35b)*′, *—Ge(R.sub.35a)(R.sub.35b)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)*′, *—S(═O)—*′, *—S(═O).sub.2—*′, *—C(R.sub.35a)═*′, *═C(R.sub.35a)—*′, *—C(R.sub.35a)═C(R.sub.35b)—*′, *—C(═S)—*′, *—C≡C—*′, a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a, or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, L.sub.32 is a single bond, a double bond, *—N(R.sub.36a)—*′, *—B(R.sub.36a)—*′, *—P(R.sub.36a)—*′, *—C(R.sub.36a)(R.sub.36b)—*′, *—Si(R.sub.36a)(R.sub.36b)—*′, *—Ge(R.sub.36a)(R.sub.36b)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O).sub.2—*′, *—C(R.sub.36a)═*′, *═C(R.sub.36a)—*′, *—C(R.sub.36a)═C(R.sub.36b)—*′, *—C(═S)—*′, *—C≡C—*, a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a, or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one Ria, L.sub.33 is a single bond, a double bond, *—N(R.sub.37a)—*′, *—B(R.sub.37a)—*′, *—P(R.sub.37a)—*, *—C(R.sub.37a)(R.sub.37b)—*′, *—Si(R.sub.37a)(R.sub.37b)—*′, *—Ge(R.sub.37a)(R.sub.37b)—*′, *—S—*′, *—Se—*,*—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O).sub.2—*′, *—C(R.sub.37a)═*′, *═C(R.sub.37a)—*′, *—C(R.sub.37a)═C(R.sub.37b)—*′, *—C(═S)—*′, *—C≡C—*′, a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a, or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, L.sub.34 is a single bond, a double bond, *—N(R.sub.38a)—*′, *—B(R.sub.38a)—*′, *—P(R.sub.38a)*′, *—C(R.sub.38a)(R.sub.38b)—*′, *—Si(R.sub.38a)(R.sub.38b)—*′, *—Ge(R.sub.38a)(R.sub.38b)—*′, *—S—*′, *—Se—*,*—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O).sub.2—*′, *—C(R.sub.38a)═*′, *═C(R.sub.38a)—*′, *—C(R.sub.38a)═C(R.sub.38b)—*′, *—C(═S)—*′, *—C≡C—*, a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a, or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, n31 to n34 are each independently an integer from 0 to 5, wherein three or more of n31 to n34 are each independently an integer from 1 to 5, when n31 is 0, L.sub.31 is not present, when n32 is 0, L.sub.32 is not present, when n33 is 0, L.sub.33 is not present, and when n34 is 0, L.sub.34 is not present, when n31 is 2 or more, two or more of L.sub.31 are identical to or different from each other, when n32 is 2 or more, two or more of L.sub.32 are identical to or different from each other, when n33 is 2 or more, two or more of L.sub.33 are identical to or different from each other, and when n34 is 2 or more, two or more of L.sub.34 are identical to or different from each other, R.sub.31 to R.sub.34, R.sub.35a, R.sub.35b, R.sub.36a, R.sub.36b, R.sub.37a, R.sub.37b, R.sub.38a, and R.sub.38b are each independently 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 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.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 arylalkyl 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 heteroarylalkyl 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(═O)(Q.sub.8)(Q.sub.9), or —P(Q.sub.8)(Q.sub.9), b31 to b34 are each independently an integer from 0 to 20, two or more of R.sub.31 in the number of b31 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, two or more of R.sub.32 in the number of b32 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, two or more of R.sub.33 in the number of b33 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, two or more of R.sub.34 in the number of b34 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, two or more of R.sub.31 to R.sub.34, R.sub.35a, R.sub.35b, R.sub.36a, R.sub.36b, R.sub.37a, R.sub.37b, R.sub.38a, and R.sub.38b are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10a or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10a, and R.sub.10a is defined as in connection with R.sub.31,
M.sub.51(L.sub.51).sub.n51(L.sub.52).sub.n52  Formula 5 wherein, in Formula 5, M.sub.51 is a transition metal, L.sub.51 is a ligand represented by Formula 5A, L.sub.52 is a ligand represented by Formula 5B, ##STR00315## n51 is 1, 2, or 3, and n52 is 0, 1, or 2, Y.sub.51 to Y.sub.54 are each independently C or N, CY.sub.51 to CY.sub.54 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, R.sub.51 to R.sub.54 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.2-C.sub.10 heterocycloalkenyl group, a substituted or unsubstituted C.sub.6-C.sub.60 aryl 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 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(═O)(Q.sub.8)(Q.sub.9), or —P(Q.sub.8)(Q.sub.9), b51 to b54 are each independently an integer from 1 to 20, * and *′ each indicate a binding site to a neighboring atom, 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.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.2-C.sub.10 heterocycloalkenyl group, the substituted C.sub.6-C.sub.60 aryl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.6-C.sub.60 arylthio group, the substituted C.sub.1-C.sub.60 heteroaryl 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, or a C.sub.1-C.sub.60 alkoxy 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, or a C.sub.1-C.sub.60 alkoxy group, each substituted with 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(Q.sub.11)(Q.sub.12)(Q.sub.13), —N(Q.sub.14)(Q.sub.18), —B(Q.sub.16)(Q.sub.17), —P(═O)(Q.sub.18)(Q.sub.19), or any 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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 monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(═O)(Q.sub.28)(Q.sub.29), or any 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), or —P(═O)(Q.sub.38)(Q.sub.39), and 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, 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.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.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.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.

15. The light-emitting device of claim 14, wherein n34 is 0, and X.sub.31 is C, and a bond between X.sub.31 and M.sub.31 is a coordinate bond.

16. The light-emitting device of claim 14, wherein, in Formula 5, i) M.sub.51 is Ir, and the sum of n51 and n52 is 3; or ii) M.sub.51 is Pt, and the sum of n51 and n52 is 2.

17. The light-emitting device of claim 13, wherein the third compound is one of Compounds P1 to P52: ##STR00316## ##STR00317## ##STR00318## ##STR00319## ##STR00320## ##STR00321## ##STR00322## ##STR00323## ##STR00324## ##STR00325## ##STR00326## ##STR00327## ##STR00328## ##STR00329## ##STR00330##

18. The light-emitting device of claim 13, wherein the fourth compound comprises a compound represented by Formula 4: ##STR00331## wherein, in Formula 4, Z is B or N, CY.sub.41 to CY.sub.43 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, L.sub.41 is *—N(R.sub.44)—*′, *—B(R.sub.44)—*′, *—P(R.sub.44)—*′, *—C(R.sub.44)(R.sub.45)—*′, *—Si(R.sub.44)(R.sub.45)—*′, *—Ge(R.sub.44)(R.sub.45)—*′, *—O—*′, *—S—*′, *—Se—*′, *—C(═O)—*′, or *—S(═O).sub.2—*′, L.sub.42 is *—N(R.sub.46)—*′, *—B(R.sub.46)—*′, *—P(R.sub.46)—*′, *—C(R.sub.46)(R.sub.47)—*′, *—Si(R.sub.46)(R.sub.47)—*′, *—Ge(R.sub.46)(R.sub.47)—*′, *—O—*′, *—S—*′, *—Se—*′, *—C(═O)—*′, or *—S(═O).sub.2—*′, L.sub.43 is *—N(R.sub.48)—*′, *—B(R.sub.48)—*′, *—P(R.sub.48)—*′, *—C(R.sub.48)(R.sub.49)—*′, *—Si(R.sub.48)(R.sub.49)—*′, *—Ge(R.sub.48)(R.sub.49)—*′, *—O—*′, *—S—*′, *—Se—*′, *—C(═O)—*′, or *—S(═O).sub.2—*′, n41 to n43 are each independently 0 or 1, when n41 is 0, L.sub.41 is not present, when n42 is 0, L.sub.42 is not present, and when n43 is 0, L.sub.43 is not present, R.sub.41 to R.sub.49 are each independently hydrogen, deuterium, —F, —Cl, —Br, —1, —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 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.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 arylalkyl 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 heteroarylalkyl 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(═O)(Q.sub.8)(Q.sub.9), or —P(Q.sub.8)(Q.sub.9), b41 to b43 are each independently an integer from 1 to 20, two or more of R.sub.41 in the number of b41 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10b or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10b, two or more of R.sub.42 in the number of b42 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10b or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10b, two or more of R.sub.43 in the number of b43 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10b or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10b, two or more of R.sub.41 to R.sub.49 are optionally bonded to each other to form a C.sub.5-C.sub.30 carbocyclic group unsubstituted or substituted with at least one R.sub.10b or a C.sub.1-C.sub.30 heterocyclic group unsubstituted or substituted with at least one R.sub.10b, R.sub.10b is defined as in connection with R.sub.41, * and *′ each indicate a binding site to a neighboring atom, 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.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.2-C.sub.10 heterocycloalkenyl group, the substituted C.sub.6-C.sub.60 aryl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.6-C.sub.60 arylthio group, the substituted C.sub.1-C.sub.60 heteroaryl 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, or a C.sub.1-C.sub.60 alkoxy 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, or a C.sub.1-C.sub.60 alkoxy group, each substituted with 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(Q.sub.11)(Q.sub.12)(Q.sub.13), —N(Q.sub.14)(Q.sub.15), —B(Q.sub.16)(Q.sub.17), —P(═O)(Q.sub.18)(Q.sub.19), or any 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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 monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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.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(═O)(Q.sub.28)(Q.sub.29), or any 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), or —P(═O)(Q.sub.37)(Q.sub.39), and 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, 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.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.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.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.

19. The light-emitting device of claim 13, wherein the fourth compound is one of Compounds D1 to D30: ##STR00332## ##STR00333## ##STR00334## ##STR00335## ##STR00336## ##STR00337## ##STR00338## ##STR00339## ##STR00340##

20. An electronic apparatus comprising the light-emitting device of claim 1.

Description

DESCRIPTION OF THE DRAWING

[0317] The FIGURE is a schematic cross-sectional view of an organic light-emitting device 10 according to an exemplary embodiment. Hereinafter, the structure and manufacturing method of the organic light-emitting device 10 according to an embodiment 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 are sequentially stacked in this stated order.

[0318] A substrate may be additionally arranged under the first electrode 11 or above the second electrode 19. For use as the substrate, any substrate that is used in organic light-emitting devices available in the art may be used, and the substrate may be a glass substrate or a transparent plastic substrate, each having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water resistance.

[0319] The first electrode 11 may be, for example, formed by depositing or sputtering a material for forming the first electrode 11 on the substrate. The first electrode 11 may be an anode. The material for forming the first electrode 11 may be selected from materials with a high work function to facilitate 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), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag).

[0320] The first electrode 11 may have a single-layered structure or a multi-layered structure including two or more layers. For example, the first electrode 11 may have a three-layered structure of ITO/Ag/ITO, but embodiments are not limited thereto.

[0321] The organic layer 15 may be arranged on the first electrode 11.

[0322] The organic layer 15 may include a hole transport region, an emission layer, and an electron transport region.

[0323] The hole transport region may be arranged between the first electrode 11 and the emission layer.

[0324] The hole transport region may include a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or any combination thereof.

[0325] The hole transport region may include only either a hole injection layer or a hole transport layer. In one or more embodiments, the hole transport region may have a hole injection layer/hole transport layer structure or a hole injection layer/hole transport layer/electron blocking layer structure, wherein, for each structure, respective layers are sequentially stacked in this stated order from the first electrode 11.

[0326] 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 (LB) deposition.

[0327] When the hole injection layer is formed by vacuum deposition, the deposition conditions may vary according to a material that is used to form the hole injection layer, and the structure and thermal characteristics of the hole injection layer. For example, the deposition conditions may include a deposition temperature in a range of about 100° C. to about 500° C., a vacuum pressure in a range of about 10.sup.8 torr to about 10.sup.3 torr, and a deposition rate in a range of about 0.01 angstroms per second (Å/sec) to about 100 Å/sec, but embodiments are not limited thereto.

[0328] When the hole injection layer is formed by spin coating, the coating conditions may vary according to a material that is used to form the hole injection layer, and the structure and thermal characteristics of the hole injection layer. For example, the coating conditions may include a coating speed in a range of about 2,000 revolutions per minute (rpm) to about 5,000 rpm and a heat treatment temperature for removing a solvent after coating in a range of about 80° C. to about 200° C., but embodiments are not limited thereto.

[0329] Conditions for forming the hole transport layer and the electron blocking layer may be the same as the conditions for forming the hole injection layer.

[0330] The hole transport region may include, for example, at least one of “m-MTDATA,” “TDATA,” “2-TNATA,” “NPB”, “β-NPB,” “TPD,” “Spiro-TPD,” “Spiro-NPB,” methylated NPB, “TAPC,” “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, a compound represented by Formula 202, or any combination thereof:

##STR00200## ##STR00201## ##STR00202##

[0331] In Formula 201, Ar.sub.101 and Ar.sub.102 may each independently be: [0332] 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 chrysenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, or a pentacenylene group; or [0333] 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 chrysenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, or a pentacenylene group, each substituted with deuterium, —F, —Cl, —Br, —I, 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 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 monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, or any combination thereof.

[0334] In Formula 201, xa and xb may each independently be an integer from 0 to 5, or may each independently be 0, 1, or 2. For example, xa may be 1, and xb may be 0, but embodiments are not limited thereto.

[0335] 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: [0336] hydrogen, deuterium, —F, —Cl, —Br, —I, 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 (for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, etc.), or a C.sub.1-C.sub.10 alkoxy group (for example, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, etc.); [0337] a C.sub.1-C.sub.10 alkyl group or a C.sub.1-C.sub.10 alkoxy group, each substituted with deuterium, —F, —Cl, —Br, —I, 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, or any combination thereof; [0338] a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, or a pyrenyl group; or [0339] a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, or a pyrenyl group, each substituted with deuterium, —F, —Cl, —Br, —I, 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 any combination thereof, but embodiments are not limited thereto.

[0340] In Formula 201, R.sub.109 may be: [0341] a phenyl group, a naphthyl group, an anthracenyl group, or a pyridinyl group; or [0342] a phenyl group, a naphthyl group, an anthracenyl group, or a pyridinyl group, each substituted with deuterium, —F, —Cl, —Br, —I, 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 phenyl group, a naphthyl group, an anthracenyl group, a pyridinyl group, or any combination thereof.

[0343] In an embodiment, the compound represented by Formula 201 may be represented by Formula 201A, but embodiments are not limited thereto:

##STR00203##

[0344] In Formula 201A, R.sub.101, R.sub.111, R.sub.112, and R.sub.109 may each be as defined herein.

[0345] For example, the compound represented by Formula 201 and the compound represented by Formula 202 may include Compounds HT1 to HT20, but embodiments are not limited thereto:

##STR00204## ##STR00205## ##STR00206## ##STR00207## ##STR00208## ##STR00209## ##STR00210## ##STR00211##

[0346] A thickness of the hole transport region may be in a range of about 100 Å to about 10,000 Å, for example, 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, a thickness of the hole injection layer may be in a range of about 100 Å to about 10,000 Å, for example, about 100 Å to about 1,000 Å, and a thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å, for example, 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 the ranges described above, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.

[0347] The hole transport region may further include, in addition to the materials described above, a charge-generation material for improving conductive properties. The charge-generation material may be homogeneously or non-homogeneously dispersed in the hole transport region.

[0348] The charge-generation material may be, for example, a p-dopant. The p-dopant may be one of a quinone derivative, a metal oxide, and a cyano group-containing compound, but embodiments are not limited thereto. For example, non-limiting examples of the p-dopant are a quinone derivative, such as tetracyanoquinonedimethane (“TCNQ”), 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (“F4-TCNQ”), and “F6-TCNQ;” a metal oxide, such as a tungsten oxide and a molybdenum oxide; and a cyano group-containing compound, such as Compounds HT-D1 and F12, but embodiments are not limited thereto:

##STR00212##

[0349] The hole transport region may further include a buffer layer.

[0350] The buffer layer may compensate for an optical resonance distance according to a wavelength of light emitted from the emission layer to improve the efficiency of an organic light-emitting device.

[0351] The emission layer may be formed on the hole transport region by using one or more suitable methods, such as vacuum deposition, spin coating, casting, and LB deposition. When the emission layer is formed by vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied in forming the hole injection layer, though the deposition or coating conditions may vary according to a material that is used.

[0352] When the hole transport region includes an electron blocking layer, a material for forming the electron blocking layer may be selected from materials for the hole transport region described above and host materials to be described below, but embodiments are not limited thereto. For example, when the hole transport region includes an electron blocking layer, a material for forming the electron blocking layer may be mCP, which will be described below.

[0353] In an embodiment, the emission layer may include a host and a dopant.

[0354] For example, the host may include the first compound and the second compound described above.

[0355] For example, the dopant may include a phosphorescent dopant, a fluorescent dopant, or any combination thereof, wherein the phosphorescent dopant may include the third compound described above, and the fluorescent dopant may include the fourth compound described above.

[0356] An amount of the dopant in the emission layer may be in a range of about 0.1 parts by weight to about 20 parts by weight based on 100 parts by weight of the emission layer.

[0357] 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, due to a stacked structure including a red emission layer, a green emission layer, and/or a blue emission layer, the emission layer may emit white light, and various modifications are possible.

[0358] Next, the electron transport region may be arranged on the emission layer.

[0359] The electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

[0360] For example, the electron transport region may have a hole blocking layer/electron transport layer/electron injection layer structure or an electron transport layer/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.

[0361] Conditions for forming the hole blocking layer, the electron transport layer, and the electron injection layer which constitute the electron transport region may be the same as the conditions for forming the hole injection layer.

[0362] When the electron transport region includes a hole blocking layer, the hole blocking layer may include, for example, at least one of BCP, Bphen, and BAlq, but embodiments are not limited thereto:

##STR00213##

[0363] A thickness of the hole blocking layer may be in a range of about 20 Å to about 1,000 Å, for example, about 30 Å to about 300 Å. When the thickness of the hole blocking layer is within the ranges described above, excellent hole blocking characteristics may be obtained without a substantial increase in driving voltage.

[0364] The electron transport layer may further include at least one of BCP, Bphen, Alq.sub.3, BAlq, TAZ, NTAZ, or any combination thereof:

##STR00214##

[0365] 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:

##STR00215## ##STR00216## ##STR00217## ##STR00218## ##STR00219## ##STR00220## ##STR00221## ##STR00222## ##STR00223##

[0366] A thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. When the thickness of the electron transport layer is within the ranges described above, satisfactory electron transporting characteristics may be obtained without a substantial increase in driving voltage.

[0367] The electron transport layer may further include, in addition to the materials described above, a metal-containing material.

[0368] The metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (lithium quinolate, “LiQ”) or ET-D2:

##STR00224##

[0369] The electron transport region may include an electron injection layer that facilitates electron injection from the second electrode 19.

[0370] The electron injection layer may include LiF, NaCl, CsF, Li.sub.2O, BaO, or any combination thereof.

[0371] A 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 the ranges described above, satisfactory electron injection characteristics may be obtained without a substantial increase in driving voltage.

[0372] The second electrode 19 may be arranged on the organic layer 15. The second electrode 19 may be a cathode. A material for forming the second electrode 19 may be a metal, an alloy, an electrically conductive compound, or a combination thereof, which has a relatively low work function. For example, lithium (Li), magnesium (Mg), aluminum (AI), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag) may be used as the material for forming the second electrode 19. In one or more embodiments, to manufacture a top-emission type light-emitting device, a transmissive electrode formed using ITO or IZO may be used as the second electrode 19.

[0373] Hereinbefore, the organic light-emitting device 10 has been described with reference to the FIGURE, but embodiments are not limited thereto.

[0374] Another aspect of the disclosure provides a diagnostic composition including at least one of the organometallic compounds represented by Formula 3 or 5.

[0375] Since the organometallic compound represented by Formula 3 or 5 provides high luminescence efficiency, the diagnostic composition including the organometallic compound may have high diagnostic efficiency.

[0376] The diagnostic composition may be used in various applications, such as a diagnosis kit, a diagnosis reagent, a biosensor, and a biomarker.

[0377] 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, and examples thereof are a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isoamyl group, a hexyl group, and the like. The term “C.sub.1-C.sub.60 alkylene group” as used herein refers to a divalent group having the same structure as the C.sub.1-C.sub.60 alkyl group.

[0378] 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 the C.sub.1-C.sub.60 alkyl group), and examples thereof are a methoxy group, an ethoxy group, an isopropoxy group, and the like.

[0379] The term “C.sub.2-C.sub.60 alkenyl group” as used herein refers to a hydrocarbon group formed by substituting at least one carbon-carbon double bond in the middle or at the terminus of the C.sub.2-C.sub.60 alkyl group, and examples thereof are an ethenyl group, a propenyl group, a butenyl group, and the like. The term “C.sub.2-C.sub.60 alkenylene group” as used herein refers to a divalent group having the same structure as the C.sub.2-C.sub.60 alkenyl group.

[0380] The term “C.sub.2-C.sub.60 alkynyl group” as used herein refers to a hydrocarbon group formed by substituting at least one carbon-carbon triple bond in the middle or at the terminus of the C.sub.2-C.sub.60 alkyl group, and examples thereof are an ethynyl group, a propynyl group, and the like. The term “C.sub.2-C.sub.60 alkynylene group” as used herein refers to a divalent group having the same structure as the C.sub.2-C.sub.60 alkynyl group.

[0381] The term “C.sub.3-C.sub.10 cycloalkyl group” as used herein refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and examples thereof are a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and the like. The term “C.sub.3-C.sub.10 cycloalkylene group” as used herein refers to a divalent group having the same structure as the C.sub.3-C.sub.10 cycloalkyl group.

[0382] The term “C.sub.1-C.sub.10 heterocycloalkyl group” as used herein refers to a monovalent monocyclic group having at least one heteroatom selected from N, O, P, Si, Ti, B, Se, Te, Ge, S, or any combination thereof as a ring-forming atom and 1 to 10 carbon atoms, and examples thereof are a tetrahydrofuranyl group, a tetrahydrothiophenyl group, and the like. The term “C.sub.1-C.sub.10 heterocycloalkylene group” as used herein refers to a divalent group having the same structure as the C.sub.1-C.sub.10 heterocycloalkyl group.

[0383] The term “C.sub.3-C.sub.10 cycloalkenyl group” as used herein refers to a monovalent monocyclic group that has 3 to 10 carbon atoms and at least one carbon-carbon double bond in the ring thereof and no aromaticity, and examples thereof are a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, and the like. The term “C.sub.3-C.sub.10 cycloalkenylene group” as used herein refers to a divalent group having the same structure as the C.sub.3-C.sub.10 cycloalkenyl group.

[0384] The term “C.sub.2-C.sub.10 heterocycloalkenyl group” as used herein refers to a monovalent monocyclic group that has at least one heteroatom selected from N, O, P, Si, Ti, B, Se, Te, Ge, S, or any combination thereof as a ring-forming atom, 2 to 10 carbon atoms, and at least one carbon-carbon double bond in the ring thereof. Examples of the C.sub.2-C.sub.10 heterocycloalkenyl group are a 2,3-dihydrofuranyl group, a 2,3-dihydrothiophenyl group, and the like. The term “C.sub.2-C.sub.10 heterocycloalkenylene group” as used herein refers to a divalent group having the same structure as the C.sub.2-C.sub.10 heterocycloalkenyl group.

[0385] 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, and 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 are a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, a chrysenyl group, and the like. When the C.sub.6-C.sub.60 aryl group and the C.sub.6-C.sub.60 arylene group each include two or more rings, the rings may be fused to each other. The term “C.sub.7-C.sub.60 alkylaryl 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.

[0386] The term “C.sub.1-C.sub.30 heteroaryl group” as used herein refers to a monovalent group having a cyclic aromatic system that has at least one heteroatom selected from N, O, P, Si, Ti, B, Se, Te, Ge, S, or any combination thereof 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 carbocyclic aromatic system that has at least one heteroatom selected from N, O, P, Ti, B, Se, Te, Ge, S, or any combination thereof as a ring-forming atom, and 1 to 60 carbon atoms. Examples of the C.sub.1-C.sub.60 heteroaryl group are a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, and the like. When the C.sub.6-C.sub.60 heteroaryl group and the C.sub.6-C.sub.60 heteroarylene group each include two or more rings, the rings may be fused to each other. The term “C.sub.2-C.sub.60 alkylheteroaryl 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.

[0387] The term “C.sub.6-C.sub.60 aryloxy group” as used herein refers to —OA.sub.102 (wherein A.sub.102 is the C.sub.6-C.sub.60 aryl group), and the term “C.sub.6-C.sub.60 arylthio group” as used herein refers to —SA.sub.103 (wherein A.sub.103 is the C.sub.6-C.sub.60 aryl group).

[0388] The term “C.sub.1-C.sub.60 heteroaryloxy group” as used herein refers to —OA.sub.104 (wherein A.sub.104 is the C.sub.1-C.sub.60 heteroaryl group), and the term “C.sub.1-C.sub.30 heteroarylthio group” as used herein refers to —SA.sub.105 (wherein A.sub.105 is the C.sub.1-C.sub.60 heteroaryl group).

[0389] The term “monovalent non-aromatic condensed polycyclic group” as used herein refers to a monovalent group (for example, having 8 to 60 carbon atoms) having two or more rings condensed to each other, only carbon atoms as ring-forming atoms, and no aromaticity in its entire molecular structure. Examples of the monovalent non-aromatic condensed polycyclic group are a fluorenyl group and the like. The term “divalent non-aromatic condensed polycyclic group” as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group.

[0390] The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein refers to a monovalent group (for example, having 2 to 60 carbon atoms) having two or more rings condensed with each other, a heteroatom selected from N, O, P, Si, and S, other than carbon atoms, as a ring-forming atom, and no aromaticity in its entire molecular structure. Examples of the monovalent non-aromatic condensed heteropolycyclic group are a carbazolyl group and the like. The term “divalent non-aromatic condensed heteropolycyclic group” as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

[0391] The term “C.sub.5-C.sub.30 carbocyclic group” as used herein refers to a saturated or unsaturated cyclic group having 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.

[0392] The term “C.sub.1-C.sub.60 heterocyclic group” as used herein refers to a saturated or unsaturated cyclic group having 1 to 30 carbon atoms and at least one heteroatom selected from N, O, P, Si, Ti, B, Se, Te, Ge, S, or any combination thereof as ring-forming atoms. The C.sub.1-C.sub.30 heterocyclic group may be a monocyclic group or a polycyclic group.

[0393] 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.2-C.sub.10 heterocycloalkenyl group, the substituted C.sub.6-C.sub.60 aryl group, the substituted C.sub.7-C.sub.60 alkylaryl group, the substituted C.sub.6-C.sub.60 aryloxy group, the substituted C.sub.6-C.sub.60 arylthio group, the substituted C.sub.1-C.sub.60 heteroaryl group, the substituted C.sub.2-C.sub.60 alkylheteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be: [0394] 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, or a C.sub.1-C.sub.60 alkoxy group; [0395] 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, or a C.sub.1-C.sub.60 alkoxy group, each substituted with 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.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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkylaryl 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 alkylheteroaryl 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(═O)(Q.sub.18)(Q.sub.19), or any combination thereof; [0396] 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkylaryl 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.6O alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group; [0397] 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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkylaryl 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.6O alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each substituted with 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.1-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.2-C.sub.10 heterocycloalkenyl group, a C.sub.6-C.sub.60 aryl group, a C.sub.7-C.sub.60 alkylaryl 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 alkylheteroaryl 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(═O)(Q.sub.26)(Q.sub.29), or any combination thereof; or [0398] —N(Q.sub.31)(Q.sub.32), —Si(Q.sub.33)(Q.sub.34)(Q.sub.35), —B(Q.sub.36)(Q.sub.37), or —P(═O)(Q.sub.38)(Q.sub.39), and [0399] 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, 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.3-C.sub.1 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.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.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.

[0400] In an embodiment, 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; 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.3-C.sub.10 cycloalkyl group, a C.sub.1-C.sub.10 heterocycloalkyl group, a C.sub.3-C.sub.10 cycloalkenyl group, or a C.sub.2-C.sub.10 heterocycloalkenyl group, each unsubstituted or substituted with deuterium, a C.sub.1-C.sub.60 alkyl group, a C.sub.3-C.sub.10 cycloalkyl group, a C.sub.6-C.sub.60 aryl group, or any combination thereof; or a C.sub.6-C.sub.60 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 monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each unsubstituted or substituted with deuterium, a C.sub.1-C.sub.60 alkyl group, a C.sub.6-C.sub.60 aryl group, or any combination thereof.

[0401] Hereinafter, a compound and an organic light-emitting device according to embodiments will be described in detail with reference to Synthesis Examples and Examples, but the disclosure is not limited thereto. The wording “B was used instead of A” used in describing Synthesis Examples means that an amount of A used was identical to an amount of B used, in terms of a molar equivalent.

EXAMPLES

Synthesis Example 1: Synthesis of Compound H9(22)

[0402] ##STR00225##

[0403] 3 grams (g) of 2-bromodibenzo[b,d]furan-1,3,4,6,7,8,9-d7, 2.1 g of 9H-3,9′-bicarbazole, 0.27 g of Pd.sub.2(dba).sub.3, and 0.85 g of sodium tert-butoxide were added to 30 milliliters (ml) of toluene. The mixture was stirred after 0.4 ml of a P(tBu).sub.3 50% solution was added thereto, and then heated under reflux. After 6 hours, the resulting solution was filtered through a silica pad and then purified by column chromatography to obtain Compound H9(22) (2.5 g, 4.8 mmol), in which 22 deuterium atoms are substituted.

[0404] LC-Mass [M].sup.+: 520.3 g/mol.

Synthesis Example 2: Synthesis of Compound E1

[0405] Compound E1 was synthesized according to the following reaction scheme.

##STR00226##

[0406] 9,9′-(6-chloro-1,3,5-triazine-2,4-diyl)bis(9H-carbazole) (9.56 g, 21.45 mmol), triphenyl(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)silane (10.91 g, 23.59 mmol), Pd(PPh.sub.3).sub.4 (2.48 g, 2.14 mmol), and K.sub.2CO.sub.3 (5.93 g, 42.90 mmol) were dissolved in tetrahydrofuran/distilled water (54 ml/22 ml). The mixture was heated and then stirred under reflux for 12 hours. After completion of the reaction, the temperature was lowered to room temperature, and then methanol (1,000 mL) was added thereto. The resulting solid was filtered and then purified by silica column chromatography to obtain 8.50 g (yield of 53%) of Compound E1.

[0407] LC-Mass (calculated: 745.27 g/mol, found: M+1=746 g/mol).

Synthesis Example 3: Synthesis of Compound D3

[0408] Compound D3 was synthesized in the same manner as in the method disclosed in WO2021-014001.

Synthesis Example 4: Synthesis of Compound E34

[0409] ##STR00227##

Synthesis of Intermediate E34-1

[0410] 9H-carbazole-1,2,3,4,5,6,7,8-d8 (CAS 38537-24-5, 2 equivalents “eq”) was reacted with n-BuLi (2 eq) at room temperature. After 15 minutes, cyanuric chloride (1 eq) was slowly added dropwise and reacted overnight at 70° C. to obtain Intermediate E34-1. Intermediate E34-1 was confirmed by LC-MS.

[0411] LC-Mass (calculated: 461.21 g/mol, found: M+1=462.33 g/mol).

Synthesis of Intermediate E34-2

[0412] 1,3-dibromobenzene-2,4,5,6-d4 (CAS 1616983-07-3, 1 eq) was reacted with n-BuLi (1.1 eq) at −78° C. After 60 minutes, chlorotris(phenyl-d5)silane (CAS 59620-15-4, 1.2 eq) was slowly added dropwise, and the temperature was slowly raised to room temperature and reacted overnight to obtain Intermediate E34-2. Intermediate E34-2 was confirmed by LC-MS.

[0413] LC-Mass (calculated: 433.16 g/mol, found: M+1=434.21 g/mol).

Synthesis of Intermediate E34-3

[0414] Intermediate E34-2 was reacted with n-BuLi under the condition of −78° C. After 60 minutes, trimethylborate was slowly added dropwise, and then the temperature was slowly raised to room temperature and reacted overnight to obtain Intermediate E34-3. Intermediate E34-3 was confirmed by LC-MS.

[0415] LC-Mass (calculated: 399.26 g/mol, found: M+1=400.10 g/mol).

Synthesis of Compound E34

[0416] 3.1 g of Intermediate E34-1, 3.2 g of Intermediate E34-3, 0.31 g of tetrakis(triphenylphosphine)palladium, and 2.3 g of potassium carbonate were put into a reaction vessel and dissolved in 40 mL of toluene, 10 mL of ethanol, and 10 mL of distilled water. The mixture was heated and then stirred under reflux for 24 hours. After the reaction was completed, the reaction solution was extracted with ethyl acetate, the collected organic layer was dried with magnesium sulfate, and the solvent was evaporated. The residue obtained by evaporation was separated by silica gel column chromatography and purified to obtain 3.4 g (yield: 64%) of Compound E34. Compound E34 was confirmed by LC-MS.

[0417] LC-Mass (calculated: 780.49 g/mol, found: M+1=781.51 g/mol).

Examples 1-1 and 2-1

[0418] A glass substrate with a 1,500 Å-thick indium tin oxide (ITO) electrode (first electrode, anode) formed thereon was cleaned by ultrasonication using distilled water. After the completion of ultrasonication using distilled water, ultrasonic cleaning was performed on the substrate using solvents, such as isopropyl alcohol, acetone, and methanol. Then, the substrate was dried, transferred to a plasma cleaner, cleaned using oxygen plasma for 5 minutes, and then transferred to a vacuum depositor.

[0419] Compound HT3 and Compound HT-D2 were co-deposited on the ITO electrode of the glass substrate to form a hole injection layer having a thickness of 100 Å, Compound HT3 was deposited on the hole injection layer to form a hole transport layer having a thickness of 1,300 Å, and mCP was deposited on the hole transport layer to form an electron blocking layer having a thickness of 100 Å, thereby forming a hole transport region.

[0420] A combination of host compounds and a dopant compound shown in Table 1 (Example 1-1) or a combination of host compounds and dopant compounds shown in Table 2 (Example 2-1) was co-deposited on the hole transport region to form an emission layer having a thickness of 400 Å.

[0421] BCP was vacuum-deposited on the emission layer to form a hole blocking layer having a thickness of 100 Å, Compound ET3 and LiQ were co-vacuum-deposited on the hole blocking layer to form an electron transport layer having a thickness of 300 Å, LiQ was deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, and an Al second electrode (cathode) having a thickness of 1,200 Å was formed on the electron injection layer, thereby completing the manufacture of a light-emitting device.

##STR00228## ##STR00229##

Example 1-2 and Comparative Examples 1-1 to 1-4

[0422] Light-emitting devices were manufactured in the same manner as in Example 1-1, except that compounds shown in Table 1 were each used in forming the emission layer. Example 2-2 and Comparative Examples 2-1 to 2-4

[0423] Light-emitting devices were manufactured in the same manner as in Example 2-1, except that compounds shown in Table 2 were each used in forming the emission layer. Evaluation Example 1: Evaluation of characteristics of light-emitting devices

[0424] The lifespan (LT.sub.95) of the light-emitting devices according to Examples and Comparative Examples was measured, and the results are shown in Tables 1 and 2. A current-voltage meter (Keithley 2400) and a luminance meter (Minolta Cs-1,000A) were used as apparatuses for evaluation, and the lifespan (LT.sub.95) (at 1,000 nit) was obtained by measuring the amount of time that elapsed until luminance was reduced to 95% of the initial luminance of 100%, and the results are expressed as relative values.

TABLE-US-00001 TABLE 1 Emission layer Host compound LT.sub.95 First Second (relative compound compound Dopant compound values) Example 1-1 H1(19) E1 P31 228 Example 1-2 H1(19)  E34 P31 292 Comparative CE1 CE2 P31 100 Example 1-1 Comparative CE3 E1 P31 168 Example 1-2 Comparative H1(19) — P31 5 Example 1-3 Comparative — E1 P31 32 Example 1-4

[0425] In Table 1, the weight ratio of the host compound to the dopant compound is 87:13, and the weight ratio of the first compound to the second compound in the host compound is 57:30.

TABLE-US-00002 TABLE 2 Emission layer Host compound Dopant compound LT.sub.95 First Second Third Fourth (relative compound compound compound compound values) Example 2-1 H1(19) E1 P31 D3 132 Example 2-2 H1(19)  E34 P31 D3 167 Comparative CE1 CE2 P31 D3 100 Example 2-1 Comparative CE3 E1 P31 D3 112 Example 2-2 Comparative H1(19) — P31 D3 3 Example 2-3 Comparative — E1 P31 D3 21 Example 2-4

[0426] In Table 2, the weight ratio of the host compound to the dopant compound is 86.2:13.8, the weight ratio of the first compound to the second compound in the host compound is 56:30.2, and the weight ratio of the third compound to the fourth compound in the dopant compound is 13:0.8.

##STR00230##

[0427] From Table 1, it was confirmed that the light-emitting device of Examples 1-1 and 1-2 had long lifespan characteristics, as compared with the light-emitting devices of Comparative Examples 1-1 to 1-4.

[0428] From Table 2, it was confirmed that the light-emitting device of Examples 2-1 and 2-2 had long lifespan characteristics, as compared with the light-emitting devices of Comparative Examples 2-1 to 2-4.

[0429] As described above, a light-emitting device using the first compound and the second compound in an emission layer may have long lifespan characteristics. Accordingly, a high-quality electronic apparatus may be implemented by using the light-emitting device.

[0430] It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, 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.