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KR-20260064840-A - ORGANOMETALLIC COMPOUND, LIGHT EMITTING DEVICE INCLUDING THE SAME AND ELECTRONIC APPRATUS COMPRISING LIGHT EMITTING DEVICE

KR20260064840AKR 20260064840 AKR20260064840 AKR 20260064840AKR-20260064840-A

Abstract

An organometallic compound represented by the following chemical formula 1, a light-emitting element including said organometallic compound, and an electronic device including said light-emitting element are disclosed: <Chemical Formula 1> M 1 (L 1 ) n1 (L 2 ) n2 L1 is a ligand represented by the following chemical formula 2A, and L2 is a ligand represented by the following chemical formula 2B, and <Chemical Formula 2A> <Chemical Formula 2B> <Chemical Formula 2C> In the chemical formula 2C, CY 4 is a group represented by the chemical formula 2C, and For a description of other configurations, refer to the description of the invention.

Inventors

  • 권오현
  • 이용주
  • 최병기
  • 홍성훈

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260508
Application Date
20241029

Claims (20)

  1. Organometallic compound represented by the following chemical formula 1: <Chemical Formula 1> M 1 (L 1 ) n1 (L 2 ) n2 Among the above chemical formula 1, M1 is a transition metal, and L1 is a ligand represented by the following chemical formula 2A, and L2 is a ligand represented by the following chemical formula 2B, and n1 is 1 or 2, and n2 is 1 or 2, and <Chemical Formula 2A> <Chemical Formula 2B> <Chemical Formula 2C> Among the above chemical formulas 2A to 2C, The bonds indicated by are single bonds or double bonds, and CY 1 and CY 2 are independently C5 - C30 carbocyclic groups or C1 - C30 heterocyclic groups, and CY3 is a C1 - C30 heterocyclic group, and CY 4 is a group represented by the above chemical formula 2C, and X 1 and X 2 are independently C or N, and Y 1 is O or S, and Y 2 is O, S, C(R 15 )(R 16 ) or N(R 15 ) and, a11 to a13 are independently selected from integers 1 to 10, and b2 is 1 or 2, and R1 to R16 are independently hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, substituted or unsubstituted C1 - C60 alkyl group, substituted or unsubstituted C2 - C60 alkenyl group, substituted or unsubstituted C2 - C60 alkynyl group, substituted or unsubstituted C1 - C60 alkoxy group, substituted or unsubstituted C3- C10 cycloalkyl group, substituted or unsubstituted C1 -C10 heterocycloalkyl group, substituted or unsubstituted C3- C10 cycloalkenyl group, substituted or unsubstituted C1-C10 heterocycloalkenyl group , substituted or an unsubstituted C6 - C60 aryl group, a substituted or unsubstituted C6 - C60 aryloxy group, a substituted or unsubstituted C6 - C60 aryltio group, a substituted or unsubstituted C1 - C60 heteroaryl group, a substituted or unsubstituted C1 - C60 heteroaryloxy group, a substituted or unsubstituted C1 - C60 heteroaryltio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic heterocondensed polycyclic group, -Si( Q1 )( Q2 )( Q3 ), -Ge( Q1 )( Q2 )( Q3 ), -N( Q4 )( Q5 ), -B( Q6 )( Q7 ) or -P(=O)( Q8 )( Q9 ), and The above substituted C1 - C60 alkyl group, substituted C2 - C60 alkenyl group, substituted C2 - C60 alkynyl group, substituted C1 - C60 alkoxy group, substituted C3 - C10 cycloalkyl group, substituted C1 - C10 heterocycloalkyl group, substituted C3 - C10 cycloalkenyl group, substituted C1 - C10 heterocycloalkenyl group, substituted C6 - C60 aryl group, substituted C6 - C60 aryloxy group, substituted C6 - C60 arylthio group, substituted C1- C60 heteroaryl group, substituted C1 - C60 heteroaryloxy group, substituted C1 - C60 heteroarylthio group, substituted monovalent non-aromatic condensed polycyclic group and substituted At least one of the substituents of the monovalent non-aromatic heterocondensed polycyclic group is, Deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group , cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C60 alkyl group, C2 - C60 alkenyl group, C2 - C60 alkynyl group or C1 - C60 alkoxy group; Deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group , cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C3 - C10 cycloalkyl group, C1 - C10 heterocycloalkyl group, C3 - C10 cycloalkenyl group, C1 - C10 heterocycloalkenyl group, C6 - C60 aryl group, C6 - C60 aryloxy group, C6- C60 arylthio group, C1 -C60 heteroaryl group , C1 - C60 A C1 -C60 alkyl group, C2- C60 alkenyl group, C2-C60 alkynyl group or C1 -C60 alkoxy group substituted with a heteroaryloxy group, a C1- C60 heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic heterocondensed polycyclic group, -Si ( Q11 )( Q12 )( Q13 ), -Ge( Q11 )( Q12 )( Q13 ), -N( Q14 )( Q15 ), -B ( Q16 ) ( Q17 ), -P ( =O)( Q18 ) ( Q19 ) , or any combination thereof; C3 - C10 cycloalkyl group, C1 - C10 heterocycloalkyl group, C3 - C10 cycloalkenyl group, C1 - C10 heterocycloalkenyl group, C6 - C60 aryl group, C6 - C60 aryloxy group, C6 - C60 arylthio group, C1 - C60 heteroaryl group, C1 - C60 heteroaryloxy group, C1 - C60 heteroarylthio group, monovalent non-aromatic condensed polycyclic group or monovalent non-aromatic heterocondensed polycyclic group; Deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group, cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C60 alkyl group, C2 - C60 alkenyl group, C2 - C60 alkynyl group, C1 - C60 alkoxy group, C3 - C10 cycloalkyl group, C1 - C10 heterocycloalkyl group, C3 - C10 cycloalkenyl group, C1 - C10 heterocycloalkenyl group, C6 - C60 aryl group, C6 -C 60 aryloxy group, C6 - C60 arylthio group, C1 - C60 heteroaryl group, C1 -C60 heteroaryloxy group, C1 - C60 heteroarylthio group, monovalent non-aromatic condensed polycyclic group, monovalent non-aromatic heterocondensed polycyclic group, C3-C10 cycloalkyl group, C1- C10 heterocycloalkyl group, C3- C10 cycloalkyl group, C1- C10 heterocycloalkyl group, C3-C10 substituted with -Si( Q21 )( Q22 )( Q23 ), -Ge( Q21 )( Q22 )(Q23), -N( Q24 )( Q25 ), -B ( Q26 )(Q27), -P ( = O ) ( Q28 ) ( Q29 ) or any combination thereof, substituted with any combination thereof Cycloalkenyl group, C1 - C10 heterocycloalkenyl group, C6 - C60 aryl group, C6 - C60 aryloxy group, C6 - C60 aryltio group, C1 - C60 heteroaryl group, monovalent non-aromatic condensed polycyclic group or monovalent non-aromatic heterocondensed polycyclic group; or -Si(Q 31 )(Q 32 )(Q 33 ), -Ge(Q 31 )(Q 32 )(Q 33 ), -N(Q 34 )(Q 35 ), -B(Q 36 )(Q 37 ) or -P(=O)(Q 38 )(Q 39 ); The above Q1 to Q9 , Q11 to Q19 , Q21 to Q29 and Q31 to Q39 are independently of each other, Hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C60 alkyl group, C2 - C60 alkenyl group, C2 - C60 alkynyl group or C1 - C60 alkoxy group; or Deuterium, -F, cyano group, C1 - C60 alkyl group, C1 - C60 alkoxy group, C3- C60 carbocyclic group, C1 - C60 heterocyclic group, or any combination thereof substituted or unsubstituted, C1 - C60 alkyl group; C2 - C60 alkenyl group; C2 - C60 alkynyl group; C1 - C60 alkoxy group, C3 - C60 carbocyclic group or C1 - C60 heterocyclic group; and, * and *' are each binding sites with M1 in Chemical Formula 1, and *'' is a bonding site with a neighboring atom.
  2. In paragraph 1, M 1 is an organometallic compound in which iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm) or rhodium (Rh).
  3. In paragraph 1, M 1 is Ir, and Organometallic compounds in which the sum of n1 and n2 is 3.
  4. In paragraph 1, L1 and L2 are organometallic compounds that are unconnected to each other through atoms other than M1 .
  5. In paragraph 1, CY 1 and CY 2 are independently a benzene group, a naphthalene group, a 1,2,3,4-tetrahydronaphthalene group, a phenanthrene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazolin group, a phenanthroline group, a benzofuran group, a benzothiophen group, a fluorene group, a carbazole group, a dibenzofuran group, a dibenzothiophen group, a dibenzocillol group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, azadibenzothiophen group, or an azadibenzocillol group, and CY 3 is an organometallic compound that is a pyridine group, pyrimidine group, pyrazine group, pyridazine group, triazine group, quinoline group, isoquinoline group, quinoxaline group, quinazolin group, phenanthroline group, carbazole group, azafluorene group, azacarbazole group, azadibenzofuran group, azadibenzothiophen group, or azadibenzosilol group.
  6. In paragraph 1, CY 1 and CY 3 independently are organometallic compounds represented by any one of the following chemical formulas A1 to A16: Among the above chemical formulas A1 to A16, The descriptions for each of R a to R d are the same as the descriptions for R 11 and R 13 in Paragraph 1, provided that each of R a to R d is not hydrogen, and * is the binding site with M1 in the above chemical formula 1, and *'' is a bonding site with a neighboring atom.
  7. In paragraph 1, CY 2 is an organometallic compound represented by any one of the following chemical formulas B1 to B16: Among the above chemical formulas B1 to B16, The description for each of R 12a to R 12d is the same as the description for R 12 in Paragraph 1, provided that each of R 12a to R 12d is not hydrogen, and * is the binding site with M1 in the above chemical formula 1, and *'' is a bonding site with a neighboring atom.
  8. In paragraph 1, An organometallic compound in which at least one of Y1 and Y2 is O.
  9. In paragraph 1, R 1 to R 16 are independently of each other, Hydrogen, deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group, cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C20 alkyl group or C1 - C20 alkoxy group; Deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group , cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C10 alkyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, adamantanyl group, norbornanyl group, norbornenyl group, cyclopentenyl group, cyclohexenyl group, cycloheptenyl group, phenyl group, naphthyl group, pyridinyl group, pyrimidinyl group or any combination thereof substituted with, C1 -C 20 alkyl group or C1 - C20 alkoxy group; Cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, adamantanyl group, norbornanyl group, norbornenyl group, cyclopentenyl group, cyclohexenyl group, cycloheptenyl group, phenyl group, naphthyl group, fluorenyl group, phenanthrenyl group, anthracenyl group, fluoranthenyl group, triphenylenyl group, pyrenyl group, chrysenyl group, pyrroleyl group, thiophenyl group, furanyl group, imidazoleyl group, pyrazolyl group, thiazoleyl group, isothiazolyl group, oxazolyl group, isoxazolyl group, pyridinyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, isoindoleyl group, indoleyl group, indazoleyl group, furinyl group, Quinolinyl group, isoquinolinyl group, benzoquinolinyl group, quinoxalinyl group, quinazolinyl group, cinolinyl group, carbazoleyl group, phenanthrolinyl group, benzimidazoleyl group, benzofuranyl group, benzothiophenyl group, isobenzothiazoleyl group, benzoxazoleyl group, isobenzoxazoleyl group, triazoleyl group, tetrazoleyl group, oxadiazoleyl group, triazinyl group, dibenzofuranyl group, dibenzothiophenyl group, benzocarbazoleyl group, dibenzocarbazoleyl group, imidazopyridinyl group or imidazopyrimidinyl group; Deuterium, -F, -Cl, -Br, -I, -CD3 , -CD2H , -CDH2, -CF3 , -CF2H , -CFH2 , hydroxyl group , cyano group, nitro group, amino group, amido group, hydrazine group, hydrazone group, carboxylic acid group or salt thereof, sulfonic acid group or salt thereof, phosphate group or salt thereof, C1 - C20 alkyl group, C1 - C20 alkoxy group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, adamantanyl group, norbornanyl group, norbornenyl group, cyclopentenyl group, cyclohexenyl group, cycloheptenyl group, phenyl group, naphthyl group, fluorenyl group, phenanthrenyl group, Anthracenyl group, Fluoranthenyl group, Triphenylenyl group, Pyrenyl group, Chrysenyl group, Pyrroleyl group, Thiophenyl group, Furanyl group, Imidazoleyl group, Pyrazolyl group, Thiazolyl group, Isothiazolyl group, Oxazoleyl group, Isoxazoleyl group, Pyridinyl group, Pyrazinyl group, Pyrimidinyl group, Pyridazinyl group, Isoindoleyl group, Indoleyl group, Indazoleyl group, Furinyl group, Quinolinyl group, Isoquinolinyl group, Benzoquinolinyl group, Quinoxalinyl group, Quinazolinyl group, Sinolinyl group, Carbazoleyl group, Phenanthrolinyl group, Benzoimidazoleyl group, Benzofuranyl group, Benzothiophenyl group, Isobenzothiazolyl group, Benzooxazoleyl group, Isobenzoxazoleyl group, Triazoleyl group, tetrazolyl group, oxadiazoleyl group, triazinyl group, dibenzofuranyl group, dibenzothiophenyl group, benzocarbazoleyl group, dibenzocarbazoleyl group, imidazopyridinyl group, imidazopyrimidinyl group or any combination thereof substituted with, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, adamantanyl group, norbornanyl group, norbornenyl group, cyclopentenyl group, cyclohexenyl group, cycloheptenyl group, phenyl group, naphthyl group, fluorenyl group, phenanthrenyl group, anthracenyl group, fluoranthenyl group, triphenylenyl group, pyrenyl group, chrysenyl group, pyrroleyl group, thiophenyl group, furanyl group, imidazoleyl group, Pyrazol single group, thiazol single group, isothiazol single group, oxazol single group, isoxazol single group, pyridinyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, isoindole single group, indole single group, indazole single group, furinyl group, quinolinyl group, isoquinolinyl group, benzoquinolinyl group, quinoxalinyl group, quinazolinyl group, cinolinyl group, carbazole single group, phenanthrolinyl group, benzimidazole single group, benzofuranyl group, benzothiophenyl group, isobenzothiazol single group, benzoxazol single group, isobenzoxazol single group, triazole single group, tetrazol single group, oxadiazole single group, triazinyl group, dibenzofuranyl group, dibenzothiophenyl group, benzocarbazole single group, Dibenzocarbazole group, imidazopyridinyl group or imidazopyrimidinyl group; or -Si(Q 1 )(Q 2 )(Q 3 ), -Ge(Q 1 )(Q 2 )(Q 3 ), -N(Q 4 )(Q 5 ), -B(Q 6 )(Q 7 ) or -P(=O)(Q 8 )(Q 9 ); Q1 to Q9 are independent of each other, -CH 3 , -CD 3 , -CD 2 H, -CDH 2 , -CH 2 CH 3 , -CH 2 CD 3 , -CH 2 CD 2 H, -CH 2 CDH 2 , -CHDCH 3 , -CHDCD 2 H, -CHDCDH 2 , -CHDCD 3 , -CD 2 CD 3 , -CD 2 CD 2 H, or -CD 2 CDH 2 ; n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, sec-pentyl group, tert-pentyl group, phenyl group or naphthyl group; or An organometallic compound substituted with deuterium, a C1 - C10 alkyl group, a phenyl group, or any combination thereof, an n-propyl group, an isopropyl 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, a phenyl group, or a naphthyl group.
  10. In paragraph 1, At least one of the a11 R11 and a12 R12 is -Si( Q1 )( Q2 )( Q3 ), -Ge( Q1 )( Q2 )( Q3 ), a C1 - C20 alkyl group substituted or unsubstituted with deuterium, or a C6 - C20 aryl group substituted or unsubstituted with deuterium, and Q1 to Q3 are independently hydrogen, deuterium, a C1 - C20 alkyl group, or a C6 - C20 aryl group, organometallic compounds.
  11. In paragraph 1, L 1 is an organometallic compound in which the ligand is represented by the following chemical formula 2A-1: <Chemical Formula 2A-1> In the above chemical formula 2A-1, Each of R 11a to R 11d is identical to the description of R 11 in Claim 1, and Each of R 12a to R 12d is identical to the description of R 12 in Claim 1, and * and *' each are the same as described in Paragraph 1.
  12. In paragraph 1, CY 4 is an organometallic compound represented by any one of the following chemical formulas 2C-1 to 2C-3: <Chemical Formula 2C-1> <Chemical Formula 2C-2> <Chemical Formula 2C-3> Among the above chemical formulas 2C1- to 2C-3, Y 1 , Y 2 , R 1 to R 10 , *' and *'' each are the same as described in claim 1, and Each of R 14a to R 14d is identical to the description of R 14 in Paragraph 1.
  13. In paragraph 1, Organometallic compound in which L2 is a ligand represented by any one of the following chemical formulas 3-1 to 3-3: <Chemical Formula 3-1> <Chemical Formula 3-2> <Chemical Formula 3-3> Among the above chemical formulas 3-1 to 3-3, Each of R 13a to R 13d is identical to the description of R 13 in Claim 1, and Each of R 14a to R 14d is identical to the description of R 14 in Claim 1, and Y 1 , Y 2 , R 1 to R 10 , * and *' each are the same as described in paragraph 1.
  14. In paragraph 1, The above organometallic compound is any one of the following compounds 1 to 120, an organometallic compound: .
  15. First electrode; A second electrode facing the first electrode; and An organic layer disposed between the first electrode and the second electrode and including a light-emitting layer; comprising The above organic layer comprises one or more organometallic compounds according to any one of claims 1 to 14, forming a light-emitting device.
  16. In paragraph 15, A light-emitting device in which the light-emitting layer comprises the organometallic compound.
  17. In Paragraph 16, A light-emitting device in which the light-emitting layer further comprises a host, and the content of the host is greater than the content of the organometallic compound.
  18. In paragraph 15, The light-emitting layer is a light-emitting device that emits green light with a maximum emission wavelength of 490 nm to 600 nm.
  19. In paragraph 15, The first electrode above is an anode, and The above second electrode is a cathode, and The above organic layer further includes a hole transport region disposed between the first electrode and the light-emitting layer and an electron transport region disposed between the light-emitting layer and the second electrode, and The hole transport region above includes a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or any combination thereof, and The above electron transport region comprises a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof, in a light-emitting device.
  20. An electronic device including a light-emitting element according to paragraph 15.

Description

Organometallic compound, light-emitting device including the same, and electronic apparatus including the light-emitting device An organometallic compound, a light-emitting element including the same, and an electronic device including the light-emitting element are presented. Organic light-emitting devices are self-luminous devices that have excellent viewing angle, response time, brightness, driving voltage, and response speed, and can be multicolored. According to one example, an organic light-emitting device may include an anode, a cathode, and an organic layer interposed between the anode and the cathode, the organic layer including a light-emitting layer. A hole transport region may be provided between the anode and the light-emitting layer, and an electron transport region may be provided between the light-emitting layer and the cathode. Holes injected from the anode may move to the light-emitting layer via the hole transport region, and electrons injected from the cathode may move to the light-emitting layer via the electron transport region. The holes and electrons may recombine in the light-emitting layer region to generate excitons. Light may be generated as the excitons change from an excited state to a ground state. FIG. 1 is a cross-sectional view schematically showing a light-emitting element according to one embodiment. The term "combined with" means that two atoms are directly bonded without any other atoms between them, through covalent bonds, coordinate bonds, etc. The term "connected to" implies not only that they are "bonded," but also that a single or multiple other atoms may exist between the two atoms. That is, if a first atom bonds with a second atom and the second atom bonds with a third atom, the first atom is connected to the third atom. For example, if atoms A1 to A3 are in the relationship " A1 - A2 - A3 ", then atom A2 is bonded to atom A1 and is connected to atom A1 , atom A2 is bonded to atom A3 and is connected to atom A3 , and atom A1 is not bonded to atom A3 but is connected to atom A3 . The above organometallic compound can be represented by the following chemical formula 1: <Chemical Formula 1> M 1 (L 1 ) n1 (L 2 ) n2 In the above chemical formula 1, M1 may be a transition metal. For example, M1 can be a first-period transition metal, a second-period transition metal, or a third-period transition metal. According to one embodiment, M1 may be iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Tm), or rhodium (Rh). According to one embodiment, M 1 may be Ir, Pt, Os, or Rh. According to one embodiment, M 1 can be Ir. In the above chemical formula 1, n1 can be 1 or 2, and n2 can be 1 or 2. According to one embodiment, the sum of n1 and n2 may be 2 or 3. According to one embodiment, n1 can be 2 and n2 can be 1. According to one embodiment, M 1 is Ir, and the sum of n1 and n2 can be 3. In the above Chemical Formula 1, L1 may be a ligand represented by the following Chemical Formula 2A: <Chemical Formula 2A> Among the above chemical formula 2A, The bonds indicated by can be single bonds or double bonds. In the above chemical formula 2A, X1 may be C or N, and X2 may be C or N. According to one embodiment, X 1 can be N. According to one embodiment, X 2 can be C. In the above chemical formula 2A, * and *' each may be a binding site with M1 in the above chemical formula 1. In the above chemical formula 2A, a11 and a12 can be independently selected from integers 1 to 10. According to one embodiment, a11 and a12 can be independently selected from integers 1 to 6. According to one embodiment, a11 and a12 can be independently selected from integers 1 to 4. In the above chemical formula 2A, CY 1 and CY 2 may independently be a C 5 -C 30 carbocyclic group or a C 1 -C 30 heterocyclic group. According to one embodiment, CY 1 and CY 2 may independently be a benzene group, a naphthalene group, a 1,2,3,4-tetrahydronaphthalene group, a phenanthrene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazolin group, a phenanthroline group, a benzofuran group, a benzothiophen group, a fluorene group, a carbazole group, a dibenzofuran group, a dibenzothiophen group, a dibenzocilol group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophen group, or an azadibenzocilol group. According to one embodiment, CY 1 and CY 2 may each be six-membered rings. In the above Chemical Formula 1, L2 may be a ligand represented by the following Chemical Formula 2B: <Chemical Formula 2B> Among the above chemical formula 2B, The bonds indicated by can be single bonds or double bonds. In the above chemical formula 2B, * and *' each may be a binding site with M1 in the above chemical formula 1. According to one embodiment, L1 and L2 may be disconnected from each other through atoms other th