# US 10,121,976 B2 · Organometallic compound and organic light-emitting device including the same

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- Number: US 10,121,976 B2
- Document ID: US10121976B2
- Status: Granted
- Kind: B2
- Application number: 14/740,807
- Filed: 2015-06-16
- Published: 2016-06-30
- Granted: 2018-11-06
- Earliest claimed: 2014-12-30
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Sung-Wook Kim; Myeong-Suk Kim; Hwan-Hee Cho
- Web page: https://patentgrep.com/patent/US10121976B2

## CPC

- H10K 85/342: {comprising iridium}
- C07F 15/0033: {Iridium compounds}
- H10K 85/40: Organosilicon compounds, e.g. TIPS pentacene
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2101/10: Triplet emission
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

An organometallic compound and an organic light-emitting device, the organometallic compound being represented by the following Formula 1: M(L1)n1(L2)n2 <Formula 1> wherein in Formula 1, M is selected from iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), and rhodium (Rh); n1 is 0, 1, 2, or 4; n2 is 1, 2, or 3; when n1 is two or more, two or more L1 are identical or different, and when n2 is two or more, two or more L2 are identical to different; L1 is selected from a monovalent organic ligand, a divalent organic ligand, a trivalent organic ligand, and a tetravalent organic ligand, and is different from L2; L2 is a ligand represented by the following Formula 2;

## Claims

### Claim 1

An organometallic compound represented by the following Formula 1:
M(L1)n1(L2)n2 <Formula 1>
wherein in Formula 1,
M is selected from iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), and rhodium (Rh);
n1 is 0, 1, 2, or 4;
n2 is 1, 2, or 3;
when n1 is two or more, two or more L1 are identical or different, and when n2 is two or more, two or more L2 are identical or different;
L1 is selected from a monovalent organic ligand, a divalent organic ligand, a trivalent organic ligand, and a tetravalent organic ligand, and is different from L2;
L2 is a ligand represented by the following Formula 2;
wherein in Formula 2,
X1 is N or C(R1), X2 is N or C(R2), X3 is N or C(R3), and X4 is N or C(R4);
X5 is N, C, or C(R5), X6 is N, C, or C(R6), X7 is N, C, or C(R7), X8 is N, C, or C(R8), and two of X5 to X8 are C,
when X5 is C, X5 binds to M or N of a benzimidazole-based moiety in Formula 2; when X6 is C, X6 binds to M or N of the benzimidazole-based moiety in Formula 2; when X7 is C, X7 binds to M or N of the benzimidazole-based moiety in Formula 2; when X8 is C, X8 binds to M or N of the benzimidazole-based moiety in Formula 2;
X9 is N or C(R9), X10 is N or C(R10), X11 is N or C(R11), X12 is N or C(R12);
R1 to R12 are each independently selected from:
a hydrogen, —F, a cyano group, a nitro group, a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, or a triazinyl group;
a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, or a triazinyl group, each substituted with at least one selected from —F, a cyano group, a nitro group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, and —Si(Q33)(Q34)(Q35); and
—Si(Q3)(Q4)(Q5),
wherein Q3 to Q5 are each independently selected from a hydrogen, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group;
R13 and R14 are each independently a hydrogen or a phenyl group;
R1 to R4 are separate or two of R1 to R4 bind to each other to form a saturated or unsaturated ring,
R9 to R12 are separate or two of R9 to R12 bind to each other to form a saturated or unsaturated ring,
R13 and R14 are separate or R13 and R14 bind to each other to form a saturated or unsaturated ring;
* and *′ each indicate a binding site to M in Formula 1.

### Claim 2 (depends on 1)

The organometallic compound as claimed in claim 1, wherein:
M is iridium (Ir), n1 is 0, 1, or 2, n2 is 1, 2, or 3, and a sum of n1 and n2 is 3; or
M is platinum (Pt), n1 is 0, 1, or 2, n2 is 1 or 2, and a sum of n1 and n2 is 2.

### Claim 3 (depends on 1)

The organometallic compound as claimed in claim 1, wherein L2 in Formula 1 is a ligand represented by one of the following Formulae 2A to 2F:
wherein, in Formulae 2A to 2F, R1 to R14, *, and *′ are defined the same as R1 to R14, * and *′ of Formula 2.

### Claim 4 (depends on 1)

The organometallic compound of claim 1, wherein L1 in Formula 1 is a ligand represented by the following Formula 3:
wherein, in Formula 3,
Y1 to Y4 are each independently carbon (C) or nitrogen (N);
Y1 and Y2 are linked to each other via a single bond or a double bond, and Y3 and Y4 are linked to each other via a single bond or a double bond;
CY1 and CY2 are each independently selected from a benzene group, a naphthalene group, a fluorene group, a spiro-fluorene group, an indene group, a pyrrol group, a thiophene group, a furan group, a imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyrimidine group, a pyridazine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a quinoxaline group, a quinazoline group, a carbazole group, a benzoimidazole group, a benzofuran group, a benzothiophene group, an isobenzothiophene group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a dibenzofuran group, and a dibenzothiophene group;
R21 and R22 are each independently selected from:
a hydrogen, a 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, —SF5, a C1-C20 alkyl group, and a c1-C20 alkoxy group;
a C1-C20 alkyl group and a C1-C20 alkoxy group, each substituted with at least one selected from a denterium, —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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a phenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;
a phenyl 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, a isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzoimidazolyl 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, and an imidazopyrimidinyl group; and
a phenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthyenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazoly; group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazoly 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 benzoimidazolyl 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, and —Si(O41)(O42)(O43), each substituted with at least one selected from a 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 or a salt thereof, a sulfonic acid or a salt thereof, a phosphoric acid or a salt thereof, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl 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 benzoimidazolyl 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, ans an imidazopyrimidinyl group;
a1 and a2 are each independently 0, 1, 2, or 3;
O41 to O43 are each independently selected from a hydrogen, a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a naphtlyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group; and
* and *′ each indicate a binding site to M in Formula 1.

### Claim 5 (depends on 4)

The organometallic compound as claimed in claim 4, wherein:
CY1 is a benzene group, a pyridine group, a pyrimidine group, or a triazine group, CY2 is a pyridine group, an imidazole group, a pyrazole group, a triazole group, or a tetrazole group;
R21 and R22 are each independently selected from:
a hydrogen, —F, a cyano group, a nitro group, —SF5, a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and
a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from —F, a cyano group and a nitro group; and
a1 and a2 are each independently 0, 1, 2, or 3.

### Claim 6 (depends on 1)

The organometallic compound as claimed in claim 1, wherein L1 in Formula 1 is a ligand represented by one of the following Formulae 3-1 to 3-24:
wherein, in Formulae 3-1 to 3-24,
R21 and R22 are each independently selected from:
a hydrogen, —F, a cyano group, a nitro group, —SF5, a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and
a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from —F, a cyano group and a nitro group;
a11 and a21 are each independently 1, 2, 3, or 4; a12 and a22 are each independently 1, 2, or 3, a13 and a23 are each independently 1 or 2; and
* and *′ each indicate a binding site to M in Formula 1.

### Claim 7 (depends on 1)

The organometallic compound as claimed in claim 1, wherein L1 in Formula 1 is a ligand represented by one of the following Formulae 4-1 to 4-4:
wherein, in Formulae 4-1 to 4-4,
Z21b, Z21c, Z21d, and Z22b are each independently selected from:
—F, a cyano group, a nitro group, a methyl group, an ethyl group, a 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 sec-pentyl group, a tort-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;
a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group, each substituted with at least one selected from —F, a cyano group, a nitro group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, and —Si(Q33)(Q34)(Q35); and
—Si(Q3)(Q4)(Q5);
wherein Q3 to Q5 and Q33 to Q35 are each independently selected from a hydrogen, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group.

### Claim 8 (depends on 7)

The organometallic compound as claimed in claim 7, wherein
Z21b, Z21c, and Z21d are each independently selected from —F, —Cl, —CN and —NO2; and a C1-C20 alkyl group and a C1-C20 alkoxy group, each substituted with at least one selected from —F, —Cl, —CN, and —NO2, and
Z22b is selected from a C1-C20 alkyl group and —N(Q41)(Q42),
wherein Q41 and Q42 are each independently selected from a hydrogen, a C1-C20 alkyl group, a phenyl group, a naphthyl group, and an anthracenyl group.

### Claim 9 (depends on 1)

The organometallic compound as claimed in claim 1, wherein the organometallic compound represented by Formula 1 is represented by one of the following Formulae 1-1 to 1-24:
wherein, in Formulae 1-1 to 1-24,
M is iridium (Ir) or platinum (Pt);
n1 is 0, 1, or 2, n2 is 1, 2, or 3, and a sum of n1 and n2 is 2 or 3;
R1 to R12 are each independently selected from:
a hydrogen, —F, a cyano group, a nitro group, a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;
a methyl group, an ethyl group, a 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 sec-pentyl group, a tert-pentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decanyl group, an isodecanyl group, a sec-decanyl group, a tert-decanyl group, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, or a triazinyl group, each substituted with at least one selected from —F, a cyano group, a nitro group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, and —Si(Q33)(Q34)(Q35); and
—Si(Q3)(Q4)(Q5),
wherein Q3 to Q5 and Q33 to Q35 are each independently a hydrogen, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, or an isoquinolinyl group;
R13 and R14 are each independently selected from a hydrogen or a phenyl group;
R21b, R21c, and R21d are each independently selected from —F, —Cl, —CN and —NO2; and a C1-C20 alkyl group and a C1-C20 alkoxy group, each substituted with at least one selected from —F, —Cl, —CN, and —NO2,
R22b is selected from a C1-C20 alkyl group and —N(Q41)(Q42), and
Q41 and Q42 are each independently selected from a hydrogen, a C1-C20 alkyl group, a phenyl group, a naphthyl group, and an anthracenyl group.

### Claim 10 (depends on 1)

The organometallic compound as claimed in claim 1, wherein the organometallic compound represented by Formula 1 is one of the following Compounds 1 to 5, and 7 to 12, 15 to 21, and 23 to 34:

### Claim 11 (depends on 1)

An organic light-emitting device, comprising:
a first electrode;
a second electrode facing the first electrode; and
an organic layer between the first electrode and the second electrode, the organic layer including an emission layer,
wherein the organic layer includes at least one organometallic compound as claimed in claim 1.

### Claim 12 (depends on 11)

The organic light-emitting device as claimed in claim 11, wherein
the first electrode is an anode,
the second electrode is a cathode, and
the organic layer includes:
a hole transport region between the first electrode and the emission layer, the hole transport region including at least one of a hole injection layer, a hole transport layer, a buffer layer, and an electron blocking layer, and
an electron transport region between the emission layer and the second electrode, the electron transport region including at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.

### Claim 13 (depends on 11)

The organic light-emitting device as claimed in claim 11, wherein the emission layer includes the at least one organometallic compound.

### Claim 14 (depends on 13)

The organic light-emitting device as claimed in claim 13, wherein the emission layer further includes a host.