Composition and organic light-emitting device including the same
地域：
Suwon-si
摘要
Provided are a composition and an organic light-emitting device including the same, wherein the composition includes a platinum-containing organometallic compound, a first compound, a second compound, and a third compound.
說明書
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This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0070359, filed on Jun. 10, 2020 and Korean Patent Application No. 10-2021-0064956, filed on May 20, 2021, in the Korean Intellectual Property Office, the contents of which are incorporated herein in their entirety by reference.
One or more embodiments relate to a composition and an organic light-emitting device including the same.
Organic light-emitting devices are self-emission devices, which have improved characteristics in terms of viewing angles, response time, brightness, driving voltage, and response speed, and produce full-color images.
In an example, an organic light-emitting device includes an anode, a cathode, and an organic layer located between the anode and the cathode and including an emission layer. A hole transport region may be located between the anode and the emission layer, and an electron transport region may be located between the emission layer and the cathode. Holes provided from the anode may move toward the emission layer through the hole transport region, and electrons provided from the cathode may move toward the emission layer through the electron transport region. The holes and the electrons recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
One or more embodiments relate to a novel composition and an organic light-emitting device including the same.
權利要求
What is claimed is:1. A composition comprising:a platinum-containing organometallic compound, a first compound, a second compound, and a third compound, wherein the platinum-containing organometallic compound, the first compound, the second compound, and the third compound are different from each other, the first compound comprises at least one electron transport moiety, the second compound does not comprise an electron transport moiety, the third compound has a greater band gap than each of a band gap of the first compound and a bandgap of the second compound, a difference between an absolute value of a highest occupied molecular orbital (HOMO) energy level of the first compound and an absolute value of a HOMO energy level of the second compound is equal to or less than about 0.35 eV, and the HOMO energy levels of the first compound and the second compound are each measured using a DFT method with Gaussian program on structures structurally optimized using B3LYP/6-31G(d,p) functional and basis set. 2. The composition of claim 1 , whereinthe platinum-containing organometallic compound comprises platinum and a tetradentate organic ligand, and the platinum and the tetradentate organic ligand together comprise 3 or 4 cyclometalated rings. 3. The composition of claim 2 , whereinthe tetradentate organic ligand comprises a benzimidazole group, or the tetradentate organic ligand comprises at least one of an amino group, a boryl group, a silyl group, an alkoxy group, or any combination thereof. 4. The composition of claim 1 , whereinthe electron transport moiety is a cyano group, a fluoro group, a π-electron deficient nitrogen-containing cyclic group, a group represented by one of the following formulae, or a combination thereof: ![embedded image]()
wherein *, *′, and *″ in the formulae above are each a binding site to a neighboring atom. 5. The composition of claim 1 , wherein the second compound comprises at least one carbazole group, at least one fused carbazole group, at least one amine group, or any combination thereof. 6. The composition of claim 1 , wherein the third compound comprises at least one group represented by Formula 4A, 4B, or 4C: ![embedded image]()
wherein, in Formulae 4A to 4C, L91 is a single bond, a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a, a91 is an integer from 1 to 10, Ar91 is a substituted or unsubstituted benzene group or a substituted or unsubstituted naphthalene group, c91 is an integer from 1 to 5, R91 to R93 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF5, 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 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-C10 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), —B(Q6)(Q7), or —P(═O)(Q8)(Q9), b91 and b92 are each independently an integer from 1 to 4, b93 is an integer from 1 to 5, and * indicates a binding site to a neighboring atom. 7. The composition of claim 1 , whereinthe platinum-containing organometallic compound is an organometallic compound represented by Formula 1, the first compound is a compound represented by Formula 2, the second compound is a compound represented by one of Formulae 3-1 to 3-4, and/or the third compound is a compound represented by one of Formulae 4-1 to 4-3: ![embedded image]()
M in Formula 1 is platinum (Pt), Y1 to Y4 in Formula 1 are each independently a chemical bond, O, S, N(Ra), C(Ra)(Rb), or Si(Ra)(Rb), X1 to X4 in Formula 1 are each independently C or N, ring CY1 to ring CY4 in Formula 1 are each independently a C5-C30 carbocyclic group or a C1-C30 heterocyclic group, T1 in Formula 1 is a single bond, a double bond, *—N(R51)—*′, *—B(R51)—*′, *—P(R51)—*′, *—C(R51)(R52)—*′, *—Si(R51)(R52)—*′, *—Ge(R51)(R52)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, *—C(R51)═*′, *═C(R51)—*′, *—C(R51)═C(R52)—*′, *—C(═S)—*′, or *—C≡C—*′, T2 in Formula 1 is a single bond, a double bond, *—N(R53)—*′, *—B(R53)—*′, *—P(R53)—*′, *—C(R3)(R54)—*′, *—Si(R53)(R54)—*′, *—Ge(R53)(R54)*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, *—C(R53)═*′, *═C(R53)—*′, *—C(R53)═C(R54)—*′, *—C(═S)—*′, or *—C≡C—*′, T3 in Formula 1 is a single bond, a double bond, *—N(R55)—*′, *—B(R55)—*′, *—P(R55)—*′, *—C(R55)(R56)—*′, *—Si(R55)(R56)—*′, *—Ge(R55)(R56)*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*—S(═O)2—*′, *—C(R55)═*′, *═C(R55)—*′, *—C(R55)═C(R56)—*′, *—C(═S)—*′, or *—C≡C—*′, Het1 in Formula 2 is a C1-C30 π-electron deficient nitrogen-containing cyclic group, n61 in Formula 2 is an integer from 1 to 10, ring CY71 and ring CY72 in Formula 3-1 are each independently a C3-C30 π-electron rich cyclic group, and are optionally linked to each other via a C3-C30 π-electron rich cyclic group that is unsubstituted or substituted with at least one R10a, X71 in Formula 3-1 is O, S, N-(L73)a73-(R73)b73, C(R73)(R74), or Si(R73)(R74), c71 and c72 in Formula 3-1 are each independently an integer from 0 to 3, X91 in Formulae 4-1 and 4-2 is O, S, or Se, Ar91 and Ar92 in Formulae 4-1 and 4-3 are each independently a substituted or unsubstituted benzene group or a substituted or unsubstituted naphthalene group, c91 and c92 in Formulae 4-1 and 4-3 are each independently an integer from 1 to 5, TPh in Formula 4-2 is a group represented by Formula 4B, m91 and m92 in Formula 4-2 are each independently an integer from 0 to 2, and the sum of m91 and m92 is 1 or more, L1 to L4, L61, L71 to L73, L81 to L87, and L91 to L94 in Formulae 1, 2, 3-1 to 3-4, and 4-1 to 4-3 are each independently a single bond, a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a, a1 to a4, a61, a71 to a73, a81 to a87, and a91 to a94 in Formulae 1, 2, 3-1 to 3-4, and 4-1 to 4-3 are each independently an integer from 1 to 10, Ra, Rb, R1 to R4, R51 to R56, R61, R62, R71 to R74, R81 to R86, R91 to R99, and Z91 to Z93 in Formulae 1, 2, 3-1 to 3-4, 4-1 to 4-3, and 4B are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF5, 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 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 heteropolycyclic group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), —B(Q6)(Q7), or —P(═O)(Q8)(Q9), two or more of Ra, Rb, R1 to R4, and R51 to R56 in Formula 1 are optionally linked together to form a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a, b1 to b4, b61, b62, b71, b72, b81 to b86, b98, and b99 in Formulae 1, 2, 3-1 to 3-4, and 4-2 are each independently an integer from 1 to 10, b91, b92, b96, and d93 in Formulae 4-1, 4-3, and 4B are each independently an integer from 1 to 4, b93 and b97 in Formulae 4-1 and 4B are each independently an integer from 1 to 5, n91 in Formulae 4-1 and 4-3 are each independently an integer from 0 to 5, b94, b95, d91, and d92 in Formulae 4-1 and 4-3 are each independently an integer from 1 to 3, c1 to c4, n61, c71, and c72 in Formulae 1, 2, and 3-1 are each independently an integer from 1 to 10, R10a is the same as described in connection with R1, * and *′ each indicate a binding site to a neighboring atom, a substituent of the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is: deuterium, —F, —Cl, —Br, —I, —CD3, —CD2H, —CDH2, —CF3, —CF2H, —CFH2, 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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group; a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group, each substituted with at least one of deuterium, —F, —Cl, —Br, —I, —CD3, —CD2H, —CDH2, —CF3, —CF2H, —CFH2, a hydroxyl group, a cyano group, a nitro 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 C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q11)(Q12), —Si(Q13)(Q14)(Q15), —B(Q16)(Q17), —P(═O)(Q18)(Q19), or any combination thereof; a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group, each unsubstituted or substituted with at least one deuterium, —F, —Cl, —Br, —I, —CD3, —CD2H, —CDH2, —CF3, —CF2H, —CFH2, 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 C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q21)(Q22), —Si(Q23)(Q24)(Q25), —B(Q26)(Q27), —P(═O)(Q28)(Q29), or any combination thereof; or —N(Q31)(Q32), —Si(Q33)(Q34)(Q35), —B(Q36)(Q37), or —P(═O)(Q38)(Q39), and Q1 to Q9, Q11 to Q19, Q21 to Q29, and Q31 to Q39 are each independently 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 C1-C60 alkyl group, a C1-C60 alkyl group substituted with at least one deuterium, a C1-C60 alkyl group, a C6-C60 aryl group, or any combination thereof, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryl group substituted with at least one deuterium, a C1-C60 alkyl group, a C6-C60 aryl group, or any combination thereof, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, or a monovalent non-aromatic condensed heteropolycyclic group. 8. The composition of claim 7 , wherein in Formula 1, Y1 is O or S, each of Y2 to Y4 is a chemical bond, each of X1 and X3 is C, and each of X2 and X4 is N. 9. The composition of claim 7 , wherein Het1 in Formula 2 is a group represented by one of Formulae 2-1 to 2-40: ![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
wherein Z61 in Formulae 2-35 and 2-36 is a group represented by *-(L61)a61-(R61)b61 in Formula 2 or R62. 10. The composition of claim 7 , wherein at least one of R61(s) in the number of b61 in Formula 2 is a group represented by Formula 2A or Formula 2B: ![embedded image]()
wherein, in Formulae 2A and 2B, ring CY201 and ring CY202 are each independently a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a carbazole ring, a dibenzofuran ring, a dibenzothiophene ring, a benzocarbazole ring, a naphthobenzofuran ring, a naphthobenzothiophene ring, a dibenzocarbazole ring, a dinaphthofuran ring, or a dinaphthothiophene ring, X201 is O, S, or N(R203), R201 to R203 are each the same as described in connection with R1, b201 and b202 are each independently an integer from 1 to 8, and * indicates a binding site to a neighboring atom. 11. The composition of claim 7 , wherein a group represented by ![embedded image]()
in Formula 3-1 is represented by one of Formulae 3(1) to 3(67) and 3(94) to 3(96): ![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
![embedded image]()
wherein, in Formulae 3(1) to 3(67) and 3(94) to 3(96), X71 is the same as described in claim 7 , X72 is O, S, N(R75), C(R75)(R76), or Si(R75)(R76), X73 is O, S, N(R77), C(R77)(R78), or Si(R77)(R78), and R75 to R78 are each the same as described in connection with R71 in claim 7 . 12. The composition of claim 7 , whereinthe third compound is a compound represented by one of Formulae 4-1(1), 4-1(2), 4-2(1) to 4-2(4), and 4-3(1): ![embedded image]()
wherein, in Formulae 4-1(1), 4-1(2), 4-2(1) to 4-2(4), and 4-3(1), X91, L91 to L94, a91 to a94, Ar91, Ar92, c91, c92, R91 to R99, Z91 to Z93, b91 to b99, and d91 to d93 are each the same as described in claim 7 , R91a and R91b are each the same as described in connection with R91 in claim 7 , R92a and R92b are each the same as described in connection with R92 in claim 7 , and R93a and R93b are each the same as described in connection with R93 in claim 7 . 13. The composition of claim 1 , wherein the first compound has a deeper energy level than the HOMO energy level of the second compound. 14. The composition of claim 1 , wherein an absolute value of the HOMO energy level of the second compound is smaller than an absolute value of the HOMO energy level of the first compound and an absolute value of the HOMO energy level of the third compound. 15. The composition of claim 1 , wherein an absolute value of the HOMO energy level of the first compound is greater than an absolute value of the HOMO energy level of the second compound and an absolute value of the HOMO energy level of the third compound. 16. A composition comprising:a platinum-containing organometallic compound, a first compound, a second compound, and a third compound, wherein the platinum-containing organometallic compound, the first compound, the second compound, and the third compound are different from each other, the first compound comprises at least one electron transport moiety, the second compound does not comprise an electron transport moiety, the third compound has a greater band gap than a band gap of the first compound and a band gap of the second compound, the platinum-containing organometallic compound is an organometallic compound represented by Formula 1-1 or 1-2: ![embedded image]()
wherein, in Formulae 1-1 and 1-2, M is platinum (Pt), Y1 is O or S, and each of Y2 to Y4 is a chemical bond, each of X1 and X3 is C, and each of X2 and X4 is N, T1 is a single bond, a double bond, *—N(R51)—*′, *—B(R51)—*′, *—P(R51)—*′, *—C(R51)(R52)—*′, *—Si(R51)(R52)—*′, *—Ge(R51)(R52)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*—C(R51)═*′, *═C(R51)—*′, *—C(R51)═C(R52)—*′, *—C(═S)—*′, or *—C≡C—*′, T2 is a single bond, a double bond, *—N(R53)—*′, *—B(R53)—*′, *—P(R53)—*′, *—C(R53)(R54)—*′, *—Si(R53)(R54)—*′, *—Ge(R53)(R54)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*—C(R53)═*′, *═C(R53)—*′, *—C(R53)═C(R54)—*′, *—C(═S)—*′, or *—C≡C—*′, T3 is a single bond, a double bond, *—N(R55)—*′, *—B(R55)—*′, *—P(R55)—*′, *—C(R55)(R56)—*′, *—Si(R55)(R56)—*′, *—Ge(R55)(R56)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*—C(R55)═*′, *═C(R55)—*′, *—C(R55)═C(R56)—*′, *—C(═S)—*′, or *—C≡C—*′, X11 is N or C-[(L11)a11-(R11)b11], X12 is N or C-[(L12)a12-(R12)b12], X13 is N or C-[(L13)a13-(R13)b13], and X14 is N or C-[(L14)a14-(R14)b14], X21 is N or C-[(L21)a21-(R21)b21], X22 is N or C-[(L22)a22-(R22)b22], and X23 is N or C-[(L23)a23-(R23)b23], X29 is O, S, C(R27)(R28), Si(R27)(R28), or N-[(L29)a29-(R29)b29], X31 is N or C-[(L31)a31-(R31)b31], X32 is N or C-[(L32)a32-(R32)b32], and X33 is N or C-[(L33)a33-(R33)b33], X41 is N or C-[(L41)a41-(R41)b41], X42 is N or C-[(L42)a42-(R42)b42], X43 is N or C-[(L43)a43-(R43)b43], and X4 is N or C-[(L44)a44-(R44)b44], L11 to L14, L21 to L23, L31 to L33, and L41 to L44 are each independently a single bond, a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a a11 to a14, a21 to a23, a31 to a33, and a41 to a44 are each independently an integer from 1 to 10, R11 to R14, R21 to R23, R27 to R29, R31 to R33, and R41 to R44 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, —SF5, a hydroxyl group, a cyano group, a nitro 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 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 heteropolycyclic group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), —B(Q6)(Q7), or —P(═O)(Q8)(Q9), b11 to b14, b21 to b23, b29, b31 to b33, and b41 to b44 are each independently an integer from 1 to 10, two of R11 to R14 are optionally linked to each other form a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a two of R21 to R23 are optionally linked to each other to form a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a, two of R31 to R33 are optionally linked to each other to form a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a, and two of R41 to R44 are optionally linked to each other to form a C5-C30 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C30 heterocyclic group unsubstituted or substituted with at least one R10a. 17. An organic light-emitting device comprising:a first electrode; a second electrode; and an organic layer located between the first electrode and the second electrode and comprising an emission layer, wherein the organic layer comprises the composition of claim 1 . 18. The organic light-emitting device of claim 17 , whereinthe first electrode is an anode, the second electrode is a cathode, the organic layer further comprises a hole transport region located between the first electrode and the emission layer and an electron transport region located between the emission layer and the second electrode, the hole transport region comprises a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or any combination thereof, and the electron transport region comprises a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof. 19. The organic light-emitting device of claim 17 , wherein the emission layer comprises the composition. 20. The organic light-emitting device of claim 19 , whereinthe emission layer comprises a dopant and a host, the dopant comprises the platinum-containing organometallic compound included in the composition, and the host comprises the first compound, the second compound, and the third compound that are included in the composition.
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