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US-12628548-B2 - Organometallic compound and organic light-emitting device including the same

US12628548B2US 12628548 B2US12628548 B2US 12628548B2US-12628548-B2

Abstract

An organometallic compound and an organic light-emitting device including the same.

Inventors

  • Sunwoo Kang
  • Sangho JEON
  • Youngmi Cho

Assignees

  • SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date
20260512
Application Date
20191121
Priority Date
20181123

Claims (17)

  1. 1 . An organic light-emitting device comprising: a first electrode; a second electrode facing the first electrode; an organic layer between the first electrode and the second electrode and comprising an emission layer; and at least one of an organometallic compound represented by Formula 1: M(L 1 ) n1 (L 2 ) n2 <Formula 1> wherein, in Formula 1, M is selected from platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), iridium (Ir), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), and thulium (Tm), in Formula 1, L 1 is a ligand represented by Formula 2-2, and n1 is 2 or 3, wherein, when n1 is 2 or more, two or more L 1 (s) are identical to or different from each other, in Formula 1, L 2 is a ligand represented by Formula 3, and n2 is 0, 1, or 2, wherein, when n2 is 2, two or more L 2 (s) are identical to or different from each other, the sum of n1 and n2 in Formula 1 is 2 or 3, in Formula 1, L 1 (s) in the number of n1 and L 2 (s) in the number of n2 are optionally linked to each other via a single bond, a first linking group, a substituted or unsubstituted C 5 -C 60 carbocyclic group, or a substituted or unsubstituted C 1 -C 60 heterocyclic group, the first linking group is selected from *″—N(R 4 )—*′″, *″—B(R 4 )—*′″, *″—P(R 4 )—*′″, *″—C(R 4 )(R 5 )—*′″, *″—Si(R 4 )(R 5 )—*′″, *″—Ge(R 4 )(R 5 )—*′″, *″—S—*′″, *″—Se—*′″, *″—O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O) 2 —*′″, *″—C(R 4 )═*′, *″═C(R 4 )—*′″, *″—C(R 4 )═C(R 5 )—*′″, *″—C(═S)—*′″, and *″—C≡C—*′″; in Formula 2-2, X 11 and X 12 are each C(R 15 ), and X 13 is N or C(R 15 ), T 21 in Formula 3 may be selected from *″—N(R 24 )—*′″, *″—B(R 24 )—*′″, *″—P(R 24 )—*′″, *″—C(R 24 )(R 25 )—*′″, *″—Si(R 24 )(R 25 )—*′″, *″—Ge(R 24 )(R 25 )—*′″, *″—S—*, *″—Se—*′″, *″O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O) 2 —*′″, *″—C(R 24 )═*′, *″═C(R 24 )—*′″, *″—C(R 24 )═C(R 25 )—*″, *″—C(═S)—*′″, and *″—C≡C—*′″; R 4 and R 5 , R 11 to R 15 , and R 21 to R 25 in Formulae 2-2 and 3 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 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 1 )(Q 2 )(Q 3 ), —N(Q 1 )(Q 2 ), —B(Q 1 )(Q 2 ), —P(Q 1 )(Q 2 ), —C(═O)(Q 1 ), —S(═O) 2 (Q 1 ), and —P(═O)(Q 1 )(Q 2 ), b21 to b23 in Formula 3 are each independently an integer from 1 to 3, wherein, when b21 is 2 or more, two or more R 21 (s) are identical to or different from each other, when b22 is 2 or more, two or more R 22 (s) are identical to or different from each other, and when b23 is 2 or more, two or more R 23 (s) are identical to or different from each other, in Formulae 2-2 and 3, two neighboring substituents among R 11 to R 14 , R 15 , R 21 (s) in the number of b21, R 22 (s) in the number of b22, R 23 (s) in the number of b23, R 24 , and R 25 are optionally linked to each other to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, a21 in Formula 3 is an integer of 2 or 3, wherein two or more T 21 (s) are identical to or different from each other, * and *′ in Formula 2-1 and 2-2 each indicate a binding site to M in Formula 1, and *″ and *′″ in Formulae 1 and 3 each indicate a binding site to a neighboring atom, at least one substituent of the substituted C 1 -C 60 alkyl group, the substituted C 2 -C 60 alkenyl group, the substituted C 2 -C 60 alkynyl group, the substituted C 1 -C 60 alkoxy group, the substituted C 3 -C 10 cycloalkyl group, the substituted C 1 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 1 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 6 -C 60 aryloxy group, the substituted C 6 -C 60 arylthio group, the substituted C 1 -C 60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, and a C 1 -C 60 alkoxy group; a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, and a C 1 -C 60 alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 11 )(Q 12 )(Q 13 ), —N(Q 11 )(Q 12 ), —B(Q 11 )(Q 12 ), —C(═O)(Q 11 ), —S(═O) 2 (Q 11 ), and —P(═O)(Q 11 )(Q 12 ); a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group; a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 21 )(Q 22 )(Q 23 ), —N(Q 21 )(Q 22 ), —B(Q 21 )(Q 22 ), —C(═O)(Q 21 ), —S(═O) 2 (Q 21 ), and —P(═O)(Q 21 )(Q 22 ); and —Si(Q 31 )(Q 32 )(Q 33 ), —N(Q 31 )(Q 32 ), —B(Q 31 )(Q 32 ), —C(═O)(Q 31 ), —S(═O) 2 (Q 31 ), and —P(═O)(Q 31 )(Q 32 ), and Q 1 to Q 3 , Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, and a cyano group, a C 6 -C 60 aryl group substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, and a cyano group, a biphenyl group, and a terphenyl group.
  2. 2 . The organic light-emitting device of claim 1 , wherein the organometallic compound comprises a four-coordinate or six-coordinate ligand and a metal atom (M 1 ), and an energy level of a triplet metal centered state ( 3 MC state) of the organometallic compound (E 3MC ) is higher than an energy level of a triplet metal-to-ligand charge transfer state ( 3 MLCT state) of the organometallic compound (E 3MLCT ).
  3. 3 . The organic light-emitting device of claim 1 , wherein the organometallic compound satisfies E 3 ≥5 kcal/mol, and E 3 is defined by Equation 1: E 3 =  E 3 ⁢ MLCT ❘ "\[RightBracketingBar]" - ❘ "\[LeftBracketingBar]" E 3 ⁢ MC  . 〈 Equation ⁢ 1 〉
  4. 4 . The organic light-emitting device of claim 1 , wherein the first electrode is an anode, the second electrode is a cathode, the organic layer comprises the at least one of the organometallic compound, the organic layer further comprises a hole transport region between the first electrode and the emission layer and an electron transport region between the emission layer and the second electrode, the hole transport region comprises at least one layer selected from a hole injection layer, a hole transport layer, a buffer layer, an emission auxiliary layer, and an electron blocking layer, and the electron transport region comprises at least one layer selected from a hole blocking layer, an electron transport layer, and an electron injection layer.
  5. 5 . The organic light-emitting device of claim 4 , wherein the emission layer comprises the at least one of the organometallic compound.
  6. 6 . The organic light-emitting device of claim 1 , wherein the emission layer emits blue light having a maximum emission wavelength of about 440 nm to about 490 nm.
  7. 7 . The organic light-emitting device of claim 4 , wherein the hole transport region comprises a p-dopant having a lowest unoccupied molecular orbital (LUMO) energy level of −3.5 eV or less.
  8. 8 . An organometallic compound represented by Formula 1: M(L 1 ) n1 (L 2 ) n2 <Formula 1> wherein, in Formula 1, M is selected from platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), iridium (Ir), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), and thulium (Tm), in Formula 1, L 1 is a ligand represented by Formula 2-2, and n1 is 2 or 3, wherein, when n1 is 2 or more, two or more L 1 (s) are identical to or different from each other, in Formula 1, L 2 is a ligand represented by Formula 3, and n2 is 0, 1, or 2, wherein, when n2 is 2, two or more L 2 (s) are identical to or different from each other, the sum of n1 and n2 in Formula 1 is 2 or 3, L 1 (s) in the number of n1 and L 2 (s) in the number of n2 in Formula 1 are optionally linked to each other via a single bond or a first linking group, the first linking group may be selected from *″—N(R 4 )—*′″, *″—B(R 4 )—*′″, *″—P(R 4 )—*′″, *″—C(R 4 )(R 5 )—*′″, *″—Si(R 4 )(R 5 )—*′″, *″—Ge(R 4 )(R 5 )—*′″, *″—S—*′″, *″—Se—*′″, *″—O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O) 2 —*′″, *″—C(R 4 )═*′, *″═C(R 4 )—*′″, *″—C(R 4 )═C(R 5 )—*′″, *″—C(═S)—*′″, and *″—C≡C—*′″; X 11 and X 12 in Formula 2-2 are each C(R 15 ), and X 13 is N or C(R 15 ), T 21 in Formula 3 may be selected from *″—N(R 24 )—*′″, *″—B(R 24 )—*′″, *″—P(R 24 )—*′″, *″—C(R 24 )(R 25 )—*′″, *″—Si(R 24 )(R 25 )—*′″, *″—Ge(R 24 )(R 25 )—*′″, *″—S—*, *″—Se—*′″, *″O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O) 2 —*′″, *″—C(R 24 )═*′, *″═C(R 24 )—*′″, *″—C(R 24 )═C(R 25 )—*″, *″—C(═S)—*′″, and *″—C≡C—*′″; R 4 and R 5 , R 11 to R 15 , and R 21 to R 25 in Formulae 2-2 and 3 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C 1 -C 60 alkyl group, a substituted or unsubstituted C 2 -C 60 alkenyl group, a substituted or unsubstituted C 2 -C 60 alkynyl group, a substituted or unsubstituted C 1 -C 60 alkoxy group, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 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 1 )(Q 2 )(Q 3 ), —N(Q 1 )(Q 2 ), —B(Q 1 )(Q 2 ), —P(Q 1 )(Q 2 ), —C(═O)(Q 1 ), —S(═O) 2 (Q 1 ), and —P(═O)(Q 1 )(Q 2 ), b21 to b23 in Formula 3 are each independently an integer from 1 to 3, wherein, when b21 is 2 or more, two or more R 21 (s) are identical to or different from each other, when b22 is 2 or more, two or more R 22 (s) are identical to or different from each other, and when b23 is 2 or more, two or more R 23 (s) are identical to or different from each other, in Formulae 2-2 and 3, two neighboring substituents among R 11 to R 14 , R 15 , R 21 (s) in the number of b21, R 22 (s) in the number of b22, R 23 (s) in the number of b23, R 24 , and R 25 are optionally linked to each other to form a substituted or unsubstituted C 5 -C 30 carbocyclic group or a substituted or unsubstituted C 1 -C 30 heterocyclic group, a21 in Formula 3 is an integer of 2 or 3, wherein two or more T 21 (s) are identical to or different from each other, * and *′ in Formula 2-2 each indicate a binding site to M in Formula 1, and *″ and *′″ in Formulae 1 and 3 each indicate a binding site to a neighboring atom, at least one substituent of the substituted C 5 -C 30 carbocyclic group, the substituted C 1 -C 30 heterocyclic group, the substituted C 1 -C 60 alkyl group, the substituted C 2 -C 60 alkenyl group, the substituted C 2 -C 60 alkynyl group, the substituted C 1 -C 60 alkoxy group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 1 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 6 -C 60 aryloxy group, the substituted C 6 -C 60 arylthio group, the substituted C 1 -C 60 heteroaryl group, the substituted C 1 -C 60 heteroaryloxy group, the substituted C 1 -C 60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, and a C 1 -C 60 alkoxy group; a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, and a C 1 -C 60 alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, -Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 11 )(Q 12 )(Q 13 ), —N(Q 11 )(Q 12 ), —B(Q 11 )(Q 12 ), —C(═O)(Q 11 ), —S(═O) 2 (Q 11 ), and —P(═O)(Q 11 )(Q 12 ); a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group; a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 21 )(Q 22 )(Q 23 ), —N(Q 21 )(Q 22 ), —B(Q 21 )(Q 22 ), —C(═O)(Q 21 ), —S(═O) 2 (Q 21 ), and —P(═O)(Q 21 )(Q 22 ); and —Si(Q 31 )(Q 32 )(Q 33 ), —N(Q 31 )(Q 32 ), —B(Q 31 )(Q 32 ), —C(═O)(Q 31 ), —S(═O) 2 (Q 31 ), and —P(═O)(Q 31 )(Q 32 ), and Q 1 to Q 3 , Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C 1 -C 60 alkyl group substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, and a cyano group, a C 6 -C 60 aryl group substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, and a cyano group, a biphenyl group, and a terphenyl group.
  9. 9 . The organometallic compound of claim 8 , wherein M in Formula 1 is selected from Pt, Ir, Pd, Cu, Ag, and Au.
  10. 10 . The organometallic compound of claim 8 , wherein, in Formula 1, n1 is 3 and n2 is 0.
  11. 11 . The organometallic compound of claim 8 , wherein X 13 in Formula 2-2 is C(R 15 ).
  12. 12 . The organometallic compound of claim 8 , wherein, in Formula 3, T 21 is *“—C(R 24 )(R 25 )—*” and a21 is 2.
  13. 13 . The organometallic compound of claim 8 , wherein R 4 and R 5 , R 11 to R 15 , and R 21 to R 25 in Formula 2-2 and 3 are each independently selected from: hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, and a C 1 -C 20 alkoxy group; a C 1 -C 20 alkyl group and a C 1 -C 20 alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, and C 1 -C 20 alkoxy group; a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyrrolyl group, an indolyl group, an isoindolyl group, an indazolyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, and a triazinyl group; and a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, and a triazinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, and a triazinyl group, —Si(Q 31 )(Q 32 )(Q 33 ), —N(Q 31 )(Q 32 ), —B(Q 31 )(Q 32 ), —C(═O)(Q 31 ), —S(═O) 2 (Q 31 ), and —P(═O)(Q 31 )(Q 32 ); and —Si(Q 1 )(Q 2 )(Q 3 ), —N(Q 1 )(Q 2 ), —B(Q 1 )(Q 2 ), —C(═O)(Q 1 ), —S(═O) 2 (Q 1 ), and —P(═O)(Q 1 )(Q 2 ), and Q 1 to Q 3 and Q 31 to Q 33 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, a C 1 -C 20 alkyl group, a C 2 -C 20 alkenyl group, a C 2 -C 20 alkynyl group, a C 1 -C 20 alkoxy group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 20 aryl group, a C 1 -C 20 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.
  14. 14 . The organometallic compound of claim 8 , wherein R 11 and R 12 in Formula 2-2 are each independently selected from hydrogen, —F, —Cl, a cyano group, a C 1 -C 20 alkyl group, and a phenyl group.
  15. 15 . The organometallic compound of claim 8 , wherein n1 is 3, X 13 (s) in three L 1 (s) are each C(R 15 ), three R 14 (s) in three L 1 (s) are linked to each other via a substituted or unsubstituted C 5 -C 60 carbocyclic group or a substituted or unsubstituted C 1 -C 60 heterocyclic group, and three R 15 (s) in three L 1 (s) are linked to each other via a substituted or unsubstituted C 5 -C 60 carbocyclic group or a substituted or unsubstituted C 1 -C 60 heterocyclic group.
  16. 16 . The organometallic compound of claim 8 , wherein the organometallic compound is a group represented by Formula 1-5: wherein, in Formula 1-5, L 11 to L 15 are each independently be selected from a single bond, *″—N(R 4 )—*′″, *″—B(R 4 )—*′″, *″—P(R 4 )*′″*, *″—C(R 4 )(R 5 )—*′″, *″—Si(R 4 )(R 5 )—*′″, *″—Ge(R 4 )(R 5 )—*′″, *″—S—*′″, *″—Se—*′″, *″—O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O) 2 —*″, *″—C(R 4 )═*′, *″═C(R 4 )—*′″, *″—C(R 4 )═C(R 5 )—*′″, *″—C(═S)—*′″, and *″—C≡C—*′″, c11 to c15 are each independently an integer from 1 to 3, wherein, when c11 is 2 or more, two or more L 11 (s) are identical to or different from each other, when c12 is 2 or more, two or more L 12 (s) are identical to or different from each other, when c13 is 2 or more, two or more L 13 (s) are identical to or different from each other, when c14 is 2 or more, two or more L 14 (s) are identical to or different from each other, and c15 is 2 or more, two or more L 15 (s) are identical to or different from each other, Ar 1 and Ar 2 are each independently selected from a substituted or unsubstituted trivalent C 5 -C 30 carbocyclic group, a substituted or unsubstituted trivalent C 1 -C 30 heterocyclic group, or a group represented by and *″, *′″, and *″″ each indicate a binding site to a neighboring atom, and R 15a to R 15b , and R 30 are each independently the same as defined in connection with R 15 , and R 21 to R 25 in Formulae 2-2, and 3, and R 2 , R 4 , R 5 , and R 11 to R 13 are each independently the same as defined in connection with Formulae 1 and 2-2.
  17. 17 . The organometallic compound of claim 8 , wherein the organometallic compound represented by Formula 1 is selected from Compounds 5 to 14:

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from and the benefit of Korean Patent Application No. 10-2018-0146767, filed on Nov. 23, 2018, and Korean Patent Application No. 10-2019-0123360, filed on Oct. 4, 2019, each of which is hereby incorporated by reference for all purposes as if fully set forth herein. BACKGROUND Field Exemplary embodiments of the invention relate to an organometallic compound and an organic light-emitting device including the same. Discussion of the Background Organic light-emitting devices are self-emission devices that produce full-color images, and also have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of brightness, driving voltage, and response speed, compared to other devices in the art. The organic light-emitting device may include a first electrode disposed on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode, which are sequentially disposed on the first electrode. Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state, thereby generating light. The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. SUMMARY One or more exemplary embodiments of the invention provide a novel organometallic compound and an organic light-emitting device including the same. Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. One or more exemplary embodiments of the inventive concepts includes an organometallic compound represented by Formula 1: M(L1)n1(L2)n2  <Formula 1> In Formula 1: M may be selected from platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), iridium (Ir), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), and thulium (Tm);L1 may be a ligand represented by Formula 2-1 or 2-2, and n1 is 1, 2, or 3, wherein, when n1 is 2 or more, two or more L1(s) may be identical to or different from each other;L2 may be a ligand represented by Formula 3, and n2 may be 0, 1, or 2, wherein, when n2 is 2 or more, two or more L2(s) may be identical to or different from each other;the sum of n1 and n2 in Formula 1 may be 2 or 3;L1(s) in the number of n1 and L2(s) in the number of n2 in Formula 1 may optionally be linked to each other via a single bond, a first linking group, or a substituted or unsubstituted C5-C60 carbocyclic group, and a substituted or unsubstituted C1-C60 heterocyclic is group;the first linking group may be selected from *″—N(R4)—*′″, *″—B(R4)—*′″, *″—P(R4)—*′″, *″—C(R4)(R5)—*′″, *″—Si(R4)(R5)—*′″, *″—Ge(R4)(R5)—*′″, *″—S—*′″, *″—Se—*′″, *″—O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O)2—*′″, *″—C(R4)═*′, *″═C(R4)—*′″, *″—C(R4)═C(R5)—*′″, *″—C(═S)—*′″, and *″—C≡C—*′″;A1 in Formula 2-1 may be selected from a C5-C60 carbocyclic group and a C1-C60 heterocyclic group;X1 and X2 in Formula 2-1 may each independently be N or C(R3);X11 and X12 in Formula 2-2 may each be C(R15), and X13 may be N or C(R15);T21 in Formula 3 may be selected from *″—N(R24)—*′″, *″—B(R24)—*′″, *″—P(R24)—*′″, *″—C(R24)(R25)—*′″, *″—Si(R24)(R25)—*′″, *″—Ge(R24)(R25)—*′″, *″—S—*, *″—Se—*′″, *″O—*′″, *″—C(═O)—*′″, *″—S(═O)—*′″, *″—S(═O)2—*′″, *″—C(R24)═*′, *″═C(R24)—*′″, *″—C(R24)═C(R25)—*″, *″—C(═S)—*′″, and *″—C≡C—*′″;R1 to R5, R11 to R15, and R21 to R25 in Formulae 2-1, 2-2, and 3 may each independently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed hete