# US 2025/0098518 A1 · Composition, light-emitting device, electronic apparatus including the light-emitting device, and organometallic compound

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- Number: US 2025/0098518 A1
- Document ID: US20250098518A1
- Status: Published application
- Kind: A1
- Application number: 18/830,437
- Filed: 2024-09-10
- Published: 2025-03-20
- Earliest claimed: 2023-09-12
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Chanseok Oh; Iljoon Kang; Soobyung Ko; Haejin Kim; Sujin Shin; Sooinn Lee; Eunyoung Lee; Mina Jeon
- Web page: https://patentgrep.com/patent/US20250098518A1

## CPC

- H10K 85/346: {comprising platinum}
- C07F 15/0086: {Platinum compounds}
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/06: containing organic luminescent materials
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 85/40: Organosilicon compounds, e.g. TIPS pentacene
- C09K 2211/1007: Non-condensed systems
- C09K 2211/1022: bridged by heteroatoms, e.g. N, P, Si or B
- C09K 2211/1029: containing one nitrogen atom as the heteroatom
- C09K 2211/1044: containing two nitrogen atoms as heteroatoms
- C09K 2211/185: of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
- H10K 50/12: comprising dopants
- H10K 2101/10: Triplet emission
- H10K 2101/90: {Multiple hosts in the emissive layer}
- 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)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

An organometallic compound, and a composition and a light-emitting device each including the organometallic compound are provided. An electronic apparatus including the light-emitting device is also provided.

## Claims

### Claim 1

A composition comprising:
an organometallic compound represented by Formula 1; and
a second compound comprising at least one π electron-deficient nitrogen-containing C1-C60 heterocyclic group, a third compound comprising a group represented by Formula 3, a fourth compound capable of emitting delayed fluorescence, or a combination thereof,
wherein the organometallic compound, the second compound, the third compound, and the fourth compound are different from each other:
wherein Ar1 in Formula 1 is a group represented by Formula 1A,
* in Formula 1A indicates a binding site to ring CY1 in Formula 1,
in Formula 1 and Formula 1A,
M is platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), silver (Ag), or copper (Cu),
X1 to X4 are each independently C or N,
i) a bond between X1 and M is a coordinate bond,
ii) one selected from among a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M is a coordinate bond and two selected from among the bond between X2 and M, the bond between X3 and M, and the bond between X4 and M is each a covalent bond,
ring CY1 to ring CY4 are each independently a C3-C60 carbocyclic group or a C1-C60 heterocyclic group,
X51 is a single bond, *—N(Z51a)—*′, *—B(Z51a)—*′, *—P(Z51a)—*′, *—C(Z51a)(Z51b)—*′, *—Si(Z51a)(Z51b)—*′, *—Ge(Z51a)(Z51b)—*′, *—S—*′, *—Se—*′ *—O—*, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, *—C(Z51a)=*′, *=C(Z51a)—*′, *—C(Z51a)═C(Z51b)—*′, *—C(═S)—*′, or *—C≡C—*′,
X52 is a single bond, *—N(Z52a)—*′, *—B(Z52a)—*′, *—P(Z52a)—*′, *—C(Z52a)(Z52b)—*′, *—Si(Z52a)(Z52b)—*′, *—Ge(Z52a)(Z52b)—*′, *—S—*′, *—Se—*′ *—O—*, *—C(═O)—*, *—S(═O)—*, *—S(=O)2—*′, *—C(Z52a)=*′, *=C(Z52a)—*′, *—C(Z52a)═C(Z52b)—*′, *—C(═S)—*′, or *—C≡C—*′,
R1 to R4, Z51a, Z51b, Z52a, Z52b, and T1 to T4 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group that is unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group that is unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group that is unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group that is unsubstituted or substituted with at least one R10a, a C7-C60 arylalkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 heteroarylalkyl group that is unsubstituted or substituted with at least one R10a, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2),
a1 to a4 are each independently an integer from 0 to 10,
c1 is an integer from 1 to 3,
c2 and c4 are each independently an integer from 1 to 5,
c3 is an integer from 1 to 4,
in Formula 1A, a group represented by
and a group represented by
are different from each other,
two or more selected from among R1, R2, R3, R4, Z51a, Z51b, Z52a, Z52b, T1, T2, T3, and T4 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
* and *′ each indicate a binding site to a neighboring atom,
R10a is:
deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, or a nitro group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q11)(Q12)(Q13), —N(Q11)(Q12), —B(Q11)(Q12), —C(═O)(Q11), —S(═O)2(Q11), —P(═O)(Q11)(Q12), or a combination thereof;
a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, or a C2-C60 heteroarylalkyl group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q21)(Q22)(Q23), —N(Q21)(Q22), —B(Q21)(Q22), —C(═O)(Q21), —S(═O)2(Q21), —P(═O)(Q21)(Q22), or a combination thereof; or
—Si(Q31)(Q32)(Q33), —N(Q31)(Q32), —B(Q31)(Q32), —C(═O)(Q31), —S(═O)2(Q31), or —P(═O)(Q31)(Q32), and
Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently: hydrogen; deuterium; —F; —Cl; —Br; —I; a hydroxyl group; a cyano group; a nitro group; or a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, or a C1-C60 heterocyclic group, each unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or a combination thereof:
and
wherein, in Formula 3,
ring CY71 and ring CY72 are each independently a π electron-rich C3-C60 cyclic group or a pyridine group,
X71 is a single bond, or a linking group comprising O, S, N, B, C, Si, or a combination thereof, and
* in Formula 3 indicates a binding site to an atom in the third compound that is not included in Formula 3.

### Claim 2

A light-emitting device comprising:
a first electrode;
a second electrode facing the first electrode;
an interlayer between the first electrode and the second electrode and comprising an emission layer; and
an organometallic compound represented by Formula 1:
wherein Ar1 in Formula 1 is a group represented by Formula 1A,
* in Formula 1A indicates a binding site to ring CY1 in Formula 1,
in Formulae 1 and 1 Å,
M is platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), silver (Ag), or copper (Cu),
X1 to X4 are each independently C or N,
i) a bond between X1 and M is a coordinate bond,
ii) one selected from among a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M is a coordinate bond and two selected from among the bond between X2 and M, the bond between X3 and M, and the bond between X4 and M is each a covalent bond,
ring CY1 to ring CY4 are each independently a C3-C60 carbocyclic group or a C1-C60 heterocyclic group,
X51 is a single bond, *—N(Z51a)—*, *—B(Z51a)—*′, *—P(Z51a)—*′, *—C(Z51a)(Z51b)—*′, *—Si(Z51a)(Z51b)—*′, *—Ge(Z51a)(Z51b)—*, *—S—*, *—Se—*′, *—O—*, *—C(═O)—*′, *—S(═O)—*′, *—S(=O)2—*′, *—C(Z51a)=*′, *=C(Z51a)—*′, *—C(Z51a)═C(Z51b)—*′, *—C(═S)—*′, or *—C≡C—*′,
X52 is a single bond, *—N(Z52a)—*′, *—B(Z52a)—*′, *—P(Z52a)—*′, *—C(Z52a)(Z52b)—*′, *—Si(Z52a)(Z52b)—*′, *—Ge(Z52a)(Z52b)—*′, *—S—*′, *—Se—*′ *—O—*, *—C(═O)—*, *—S(═O)—*, *—S(=O)2—*′, *—C(Z52a)=*′, *=C(Z52a)—*′, *—C(Z52a)═C(Z52b)—*′, *—C(═S)—*′, or *—C≡C—*′,
R1 to R4, Z51a, Z51b, Z52a, Z52b, and T1 to T4 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group that is unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group that is unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group that is unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group that is unsubstituted or substituted with at least one R10a, a C7-C60 arylalkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 heteroarylalkyl group that is unsubstituted or substituted with at least one R10a, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2),
a1 to a4 are each independently an integer from 0 to 10,
c1 is an integer from 1 to 3,
c2 and c4 are each independently an integer from 1 to 5,
c3 is an integer from 1 to 4,
in Formula 1A, a group represented by
and a group represented by
are different from each other,
two or more selected from among R1, R2, R3, R4, Z51a, Z51b, Z52a, Z52b, T1, T2, T3, and T4 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
* and *′ each indicate a binding site to a neighboring atom,
R10a is:
deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, or a nitro group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q11)(Q12)(Q13), —N(Q11)(Q12), —B(Q11)(Q12), —C(═O)(Q11), —S(═O)2(Q11), —P(═O)(Q11)(Q12), or a combination thereof;
a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, or a C2-C60 heteroarylalkyl group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q21)(Q22)(Q23), —N(Q21)(Q22), —B(Q21)(Q22), —C(═O)(Q21), —S(═O)2(Q21), —P(═O)(Q21)(Q22), or a combination thereof; or
—Si(Q31)(Q32)(Q33), —N(Q31)(Q32), —B(Q31)(Q32), —C(═O)(Q31), —S(═O)2(Q31), or —P(═O)(Q31)(Q32), and
Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently hydrogen; deuterium; —F; —C1; —Br; —I; a hydroxyl group; a cyano group; a nitro group; or a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, or a C1-C60 heterocyclic group, each unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or a combination thereof.

### Claim 3 (depends on 2)

The light-emitting device of claim 2, further comprising a second compound comprising at least one π electron-deficient nitrogen-containing C1-C60 heterocyclic group, a third compound comprising a group represented by Formula 3, a fourth compound capable of emitting delayed fluorescence, or any combination thereof,
wherein the organometallic compound, the second compound, the third compound, and the fourth compound are different from each other:
and
wherein, in Formula 3,
ring CY71 and ring CY72 are each independently a π electron-rich C3-C60 cyclic group or a pyridine group,
X71 is a single bond, or a linking group comprising O, S, N, B, C, Si, or a combination thereof, and
* in Formula 3 indicates a binding site to an atom in the third compound that is not included in Formula 3.

### Claim 4 (depends on 3)

The light-emitting device of claim 3, wherein the second compound comprises a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, or a combination thereof, and
the fourth compound is a compound comprising at least one cyclic group comprising each of boron (B) and nitrogen (N) as a ring-forming atom.

### Claim 5 (depends on 3)

The light-emitting device of claim 3, wherein the emission layer comprises:
i) the organometallic compound represented by Formula 1; and
ii) the second compound, the third compound, the fourth compound, or a combination thereof, and
the emission layer is configured to emit blue light.

### Claim 6 (depends on 3)

The light-emitting device of claim 3, comprising the second compound and the third compound, wherein at least one of the second compound or the third compound comprises at least one deuterium, at least one silicon, or a combination thereof.

### Claim 7 (depends on 2)

An electronic apparatus, the electronic apparatus comprising the light-emitting device of claim 2.

### Claim 8 (depends on 7)

The electronic apparatus of claim 7, further comprising a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or a combination thereof.

### Claim 9 (depends on 2)

An electronic equipment, the electronic equipment comprising the light-emitting device of claim 2.

### Claim 10 (depends on 9)

The electronic equipment of claim 9, wherein the electronic equipment is at least one selected from among a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an indoor or outdoor light and/or light for signal, a head-up display, a fully or partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a portable phone, a tablet personal computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality or augmented reality display, a vehicle, a video wall with multiple displays tiled together, a theater or stadium screen, a phototherapy device, and a signboard, or a combination thereof.

### Claim 11

An organometallic compound represented by Formula 1:
wherein Ar1 in Formula 1 is a group represented by Formula 1A,
* in Formula 1A indicates a binding site to ring CY1 in Formula 1,
in Formula 1 and Formula 1A,
M is platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), silver (Ag), or copper (Cu),
X1 to X4 are each independently C or N,
i) a bond between X1 and M is a coordinate bond,
ii) one selected from among a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M is a coordinate bond, and two selected from among a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M is each a covalent bond,
ring CY1 to ring CY4 are each independently a C3-C60 carbocyclic group or a C1-C60 heterocyclic group,
X51 is a single bond, *—N(Z51a)—*′, *—B(Z51a)—*′, *—P(Z51a)—*′, *—C(Z51a)(Z51b)—*′, *—Si(Z51a)(Z51b)—*′, *—Ge(Z51a)(Z51b)—*′, *—S—*′, *—Se—*′ *—O—*, *—C(═O)—*′, *—S(═O)—*′, *—S(=O)2—*′, *—C(Z51a)=*′, *=C(Z51a)—*′, *—C(Z51a)═C(Z51b)—*′, *—C(═S)—*′, or *—C≡C—*′,
X52 is a single bond, *—N(Z52a)—*′, *—B(Z52a)—*′, *—P(Z52a)—*′, *—C(Z52a)(Z52b)—*′, *—Si(Z52a)(Z52b)—*′, *—Ge(Z52a)(Z52b)—*′, *—S—*′, *—Se—*′ *—O—*, *—C(═O)—*, *—S(═O)—*, *—S(=O)2—*′, *—C(Z52a)=*′, *=C(Z52a)—*′, *—C(Z52a)═C(Z52b)—*′, *—C(═S)—*′, or *—C≡C—*′,
R1 to R4, Z51a, Z51b, Z52a, Z52b, and T1 to T4 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group that is unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group that is unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group that is unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group that is unsubstituted or substituted with at least one R10a, a C7-C60 arylalkyl group that is unsubstituted or substituted with at least one R10a, a C2-C60 heteroarylalkyl group that is unsubstituted or substituted with at least one R10a, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2),
a1 to a4 are each independently an integer from 0 to 10,
c1 is an integer from 1 to 3,
c2 and c4 are each independently an integer from 1 to 5,
c3 is an integer from 1 to 4,
in Formula 1A, a group represented by
and a group represented by
are different from each other,
two or more selected from among R1, R2, R3, R4, Z51a, Z51b, Z52a, Z52b, T1, T2, T3, and T4 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
* and *′ each indicate a binding site to a neighboring atom,
R10a is:
deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, or a nitro group;
a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q11)(Q12)(Q13), —N(Q11)(Q12), —B(Q11)(Q12), —C(═O)(Q11), —S(═O)2(Q11), —P(═O)(Q11)(Q12), or a combination thereof;
a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, or a C2-C60 heteroarylalkyl group, each unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C7-C60 arylalkyl group, a C2-C60 heteroarylalkyl group, —Si(Q21)(Q22)(Q23), —N(Q21)(Q22), —B(Q21)(Q22), —C(═O)(Q21), —S(═O)2(Q21), —P(═O)(Q21)(Q22), or a combination thereof; or
—Si(Q31)(Q32)(Q33), —N(Q31)(Q32), —B(Q31)(Q32), —C(═O)(Q31), —S(═O)2(Q31), or —P(═O)(Q31)(Q32), and
Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently: hydrogen; deuterium; —F; —Cl; —Br; —I; a hydroxyl group; a cyano group; a nitro group; or a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, or a C1-C60 heterocyclic group, each unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or a combination thereof.

### Claim 12 (depends on 11)

The organometallic compound of claim 11, wherein X1 is C, and
ring CY1 is an imidazole group, a triazole group, a benzimidazole group, a naphthoimidazol group, or an imidazopyridine group.

### Claim 13 (depends on 1)

The organometallic compound of claim 1, wherein R1 to R4, Z51a, Z51b, Z52a, Z52b, and T1 to T4 are each independently:
hydrogen, deuterium, —F, or a cyano group;
a C1-C20 alkyl group that is unsubstituted or substituted with deuterium, —F, a cyano group, a phenyl group, a deuterated phenyl group, a fluorinated phenyl group, a (C1-C20 alkyl)phenyl group, a biphenyl group, a deuterated biphenyl group, a fluorinated biphenyl group, a (C1-C20 alkyl)biphenyl group, or a combination thereof; or
a C3-C10 cycloalkyl group, a phenyl group, a naphthyl group, a dibenzofuranyl group, or a dibenzothiophenyl group, each unsubstituted or substituted with deuterium, —F, cyano group, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, a fluorinated C1-C20 alkyl group, a phenyl group, a deuterated phenyl group, a fluorinated phenyl group, a (C1-C20 alkyl)phenyl group, a biphenyl group, a deuterated biphenyl group, a fluorinated biphenyl group, a (C1-C20 alkyl)biphenyl group, or a combination thereof.

### Claim 14 (depends on 11)

The organometallic compound of claim 11, wherein T1 to T4 are each independently:
hydrogen, deuterium, —F, or a cyano group; or
a C1-C20 alkyl group that is unsubstituted or substituted with deuterium, —F, a cyano group, or a combination thereof.

### Claim 15 (depends on 11)

The organometallic compound of claim 11, comprising at least one deuterium.

### Claim 16 (depends on 11)

The organometallic compound of claim 11, wherein Formula 1A satisfies one selected from among Condition C1 to Condition C3:
Condition C1
T1 is hydrogen or deuterium;
Condition C2
one of T1 is:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T1 are hydrogen or deuterium; and
Condition C3
two of T1 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T1 is hydrogen or deuterium.

### Claim 17 (depends on 11)

The organometallic compound of claim 11, wherein Formula 1A satisfies one selected from among Condition D1 to Condition D4:
Condition D1
T2 is hydrogen or deuterium;
Condition D2
one of T2 is:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T2 are hydrogen or deuterium;
Condition D3
two of T2 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T2 are hydrogen or deuterium; and
Condition D4
three of T2 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T2 are hydrogen or deuterium.

### Claim 18 (depends on 11)

The organometallic compound of claim 11, wherein Formula 1A satisfies one selected from among Condition E1 to Condition E3:
Condition E1
T3 is hydrogen or deuterium;
Condition E2
one of T3 is:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T3 are hydrogen or deuterium; and
Condition E3
two of T3 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T3 are hydrogen or deuterium.

### Claim 19 (depends on 11)

The organometallic compound of claim 11, wherein Formula 1A satisfies one selected from among Condition F1 to Condition F4:
Condition F1
T4 is hydrogen or deuterium;
Condition F2
one of T4 is:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T4 are hydrogen or deuterium;
Condition F3
two of T4 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T4 are hydrogen or deuterium; and
Condition F4
three of T4 are each independently:
a C1-C20 alkyl group that is unsubstituted or substituted with at least one deuterium; or
a C6-C20 aryl group that is unsubstituted or substituted with deuterium, a C1-C20 alkyl group, a deuterated C1-C20 alkyl group, or any combination thereof, and any remaining T4 are hydrogen or deuterium.

### Claim 20 (depends on 11)

The organometallic compound of claim 11, wherein the organometallic compound is represented by Formula 1-1 or Formula 1-2:
and
wherein, in Formula 1-1 and Formula 1-2,
M, X1 to X4, X51, T1 to T4, and c1 to c4 are each as described for Formula 1 and Formula 1A,
X11 is C(R11) or N, X12 is C(R12) or N, X13 is C(R13) or N, and X14 is C(R14) or N,
R1 to R14 are each as described in connection with R1 for Formula 1, wherein two or more selected from among R11 to R14 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
X21 is C(R21) or N, X22 is C(R22) or N, and X23 is C(R23) or N,
R21 to R23 are each as described in connection with R2 for Formula 1, wherein two or more selected from among R21 to R23 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
X31 is C(R31) or N, X32 is C(R32) or N, X33 is C(R33) or N, X34 is C(R34) or N, X35 is C(R35) or N, and X36 is C(R36) or N,
R31 to R36 are each as described in connection with R3 for Formula 1, wherein two or more selected from among R31 to R36 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
X41 is C(R41) or N, X42 is C(R42) or N, X43 is C(R43) or N, and X44 is C(R44) or N,
R41 to R44 are each as described in connection with R4 for Formula 1, wherein two or more selected from among R41 to R44 are optionally bonded together to form a C3-C60 carbocyclic group that is unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group that is unsubstituted or substituted with at least one R10a,
a group represented by
and a group represented by
are different from each other, and
* indicates a binding site to a neighboring atom,
R10a is the same as defined in claim 11.