US20220356193A1 - Plurality of host materials and organic electroluminescent device comprising the same - Google Patents

Plurality of host materials and organic electroluminescent device comprising the same Download PDF

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US20220356193A1
US20220356193A1 US17/214,253 US202117214253A US2022356193A1 US 20220356193 A1 US20220356193 A1 US 20220356193A1 US 202117214253 A US202117214253 A US 202117214253A US 2022356193 A1 US2022356193 A1 US 2022356193A1
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membered
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So-Young Jung
Ji-Song Jun
Su-Hyun Lee
Sang-Hee Cho
Jin-Ri Hong
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Rohm and Haas Electronic Materials Korea Ltd
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Rohm and Haas Electronic Materials Korea Ltd
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Publication of US20220356193A1 publication Critical patent/US20220356193A1/en
Priority to US18/406,700 priority Critical patent/US20240174694A1/en
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Definitions

  • the present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same.
  • OLED organic electroluminescent device
  • Korean Patent Application Laying-Open No. 2020-0000329 discloses a plurality of host materials comprising a compound having a heteroaryl bonded to a phenanthrene moiety and a compound having a heteroaryl bonded to a carbazole moiety.
  • said reference does not specifically disclose a specific combination of host materials claimed in the present disclosure.
  • development of a light-emitting material having improved performances, for example, improved driving voltage, luminous efficiency, power efficiency and/or lifetime property as compared with combinations of specific compounds conventionally disclosed is still required.
  • the objective of the present disclosure is to provide an organic electroluminescent device having low driving voltage, high luminous efficiency, high power efficiency and/or excellent lifetime property by comprising a plurality of host materials including a specific combination of compounds.
  • the present inventors found that the above objective can be achieved by a plurality of host materials comprising at least one first host compound and at least second host compound, wherein the first host compound is represented by the following formula 1, and the second host compound is represented by the following formula 2:
  • B 1 to B 7 each independently, are not present, or represent a substituted or unsubstituted (C5-C20) ring, in which carbon atoms of the ring may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, with the proviso that at least five of B 1 to B 7 are present, and adjacent rings of B 1 to B 7 are fused with each other;
  • Y represents —N(L 1 -(Ar 1 ) n )—, —O—, —S—, or —C(R 1 )(R 2 )—;
  • L 1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
  • Ar 1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —N(R 3 )(R 4 );
  • R 1 to R 4 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent to form a ring(s); and
  • n an integer of 1 or 2, where if n is 2, each of Ar 1 may be the same or different;
  • X represents —N ⁇ , —NR 35 —, —O— or —S—;
  • Z represents —N ⁇ , —NR 36 —, —O— or —S—, where if X represents —N ⁇ , Z represents —NR 36 —, —O— or —S—, and if X represents —NR 35 —, Z represents —N ⁇ , —O— or —S—;
  • HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl
  • R 31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
  • R 32 to R 34 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6
  • R 35 and R 36 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6
  • L 2 and L 3 each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
  • Ar 2 and Ar 3 each independently, represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and
  • a′ represents 1, b′ and c′, each independently, represent an integer of 1 or 2
  • d′ represents an integer of 1 to 4, where if each of b′, c′ and d′ is an integer of 2 or more, each of R 32 to each of R 34 may be the same or different.
  • an organic electroluminescent device having lower driving voltage, higher luminous efficiency, higher power efficiency and/or better lifetime property compared to conventional organic electroluminescent devices can be provided, and it is possible to produce a display system or a lighting system using the same.
  • organic electroluminescent material in the present disclosure means a material that may be used in an organic electroluminescent device, and may comprise at least one compound.
  • the organic electroluminescent material may be comprised in any layer constituting an organic electroluminescent device as necessary.
  • the organic electroluminescent material may be a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material (including a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc.
  • a plurality of organic electroluminescent materials in the present disclosure means an organic electroluminescent material comprising a combination of at least two compounds, which may be comprised in any layer constituting an organic electroluminescent device. It may mean both a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) and a material after being comprised in an organic electroluminescent device (for example, after vapor deposition).
  • a plurality of organic electroluminescent materials of the present disclosure may be a combination of at least two compounds, which may be comprised in at least one layer of a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron blocking layer, a light-emitting layer, an electron buffer layer, a hole blocking layer, an electron transport layer, and an electron injection layer.
  • the at least two compounds may be comprised in the same layer or different layers, and may be mixture-evaporated or co-evaporated, or may be individually evaporated.
  • a plurality of host materials in the present disclosure means an organic electroluminescent material comprising a combination of at least two host materials. It may mean both a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) and a material after being comprised in an organic electroluminescent device (for example, after vapor deposition).
  • the plurality of host materials of the present disclosure may be comprised in any light-emitting layer constituting an organic electroluminescent device.
  • At least two compounds comprised in the plurality of host materials of the present disclosure may be comprised together in one light-emitting layer or may respectively be comprised in different light-emitting layers.
  • at least two host materials are comprised in one layer, for example, they may be mixture-evaporated to form a layer or may be separately co-evaporated at the same time to form a layer.
  • (C1-C30)alkyl is meant to be a linear or branched alkyl having 1 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 1 to 20, and more preferably 1 to 10.
  • the above alkyl may include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, etc.
  • (C2-C30)alkenyl is meant to be a linear or branched alkenyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10.
  • the above alkenyl may include vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc.
  • (C2-C30)alkynyl is meant to be a linear or branched alkynyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10.
  • the above alkynyl may include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc.
  • (C3-C30)cycloalkyl is meant to be a mono- or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, in which the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7.
  • the above cycloalkyl may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.
  • (3- to 7-membered)heterocycloalkyl is meant to be a cycloalkyl having 3 to 7, preferably 5 to 7, ring backbone atoms, and including at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, and preferably the group consisting of O, S, and N.
  • the above heterocycloalkyl may include tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, etc.
  • (C6-C30)aryl(ene) is meant to be a monocyclic or fused ring radical derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms, in which the number of the ring backbone carbon atoms is preferably 6 to 25, and more preferably 6 to 18.
  • the above aryl(ene) may be partially saturated, and may comprise a spiro structure.
  • the above aryl may include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, phenylterphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, azulenyl, etc.
  • the above aryl may include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthacenyl, pyrenyl, 1-chrysenyl, 2-chrysenyl, 3-chrysenyl, 4-chrysenyl, 5-chrysenyl, 6-chrysenyl, benzo[c]phenanthryl, benzo[g]chrysenyl, 1-triphenylenyl, 2-triphenylenyl, 3-triphenylenyl, 4-triphenylenyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, benzo[a]fluorenyl, benzo[a
  • (3- to 30-membered)heteroaryl” or “(3- to 50-membered)heteroaryl” is meant to be an aryl having 3 to 30 ring backbone atoms or 3 to 50 ring backbone atoms, and including at least one, preferably 1 to 4 heteroatoms selected from the group consisting of B, N, O, S, Si, and P.
  • the above heteroaryl may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and may comprise a spiro structure.
  • the above heteroaryl may include a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl, and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, be
  • the above heteroaryl may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridinyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazin-4-yl, 1,2,4-triazin-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5-indolidinyl, 6-indolidinyl, 7-indolidinyl, 8-indolidinyl, 2-imidazopyridinyl, 3-imidazopyridinyl, 5-imidazopyridinyl, 6-imidazopyridinyl, 7-imidazopyridinyl, 8-imidazopyridinyl, 3-pyridinyl, 5-imidazo
  • ortho indicates that two substituents are adjacent to each other, and for example, when two substituents in a benzene derivative occupy positions 1 and 2, it is called an ortho position.
  • Meta indicates that two substituents are at positions 1 and 3, and for example, when two substituents in a benzene derivative occupy positions 1 and 3, it is called a meta position.
  • Para indicates that two substituents are at positions 1 and 4, and for example, when two substituents in a benzene derivative occupy positions 1 and 4, it is called a para position.
  • substituted in the expression “substituted or unsubstituted” means that a hydrogen atom in a certain functional group is replaced with another atom or another functional group, i.e., a substituent.
  • the substituents are at least one selected from the group consisting of deuterium; a (C1-C20)alkyl; a (3- to 30-membered)heteroaryl unsubstituted or substituted with at least one of a (C1-C20)alkyl(s) and a (C6-C25)aryl(s); a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C20)alkyl(s), a (3- to 30-membered)heteroaryl(s), and a di(C6-C25)arylamino(s); and a mono- or di-(C6-C25)arylamino.
  • the substituents are at least one selected from the group consisting of deuterium; a (C1-C10)alkyl; a (5- to 26-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s); a (C6-C20)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C10)alkyl(s), a (5- to 26-membered)heteroaryl(s), and a di(C6-C18)arylamino(s); and a di(C6-C18)arylamino.
  • the substituents may be at least one selected from the group consisting of deuterium; a methyl; a phenyl unsubstituted or substituted with at least one of deuterium, a 26-membered heteroaryl(s), and a diphenylamino(s); a naphthyl; a biphenyl; a naphthylphenyl; a phenylnaphthyl; a phenanthrenyl; a dimethylfluorenyl; a dimethylbenzofluorenyl; a terphenyl; a triphenylenyl; a pyridyl unsubstituted or substituted with a phenyl(s); a triazinyl substituted with a phenyl(s); a dibenzofuranyl; a dibenzothiophenyl; a benzonaphthothiophenyl; a carb
  • the ring may be a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof, which two or more adjacent substituents are linked to form.
  • the formed ring may contain at least one heteroatom selected from B, N, O, S, Si, and P, preferably at least one heteroatom selected from N, O, and S.
  • the number of the ring backbone atoms is 5 to 20.
  • the number of the ring backbone atoms is 5 to 15.
  • heteroaryl and heteroarylene may, each independently, contain at least one heteroatom selected from B, N, O, S, Si, and P.
  • the heteroatom may be bonded to at least one selected from the group consisting of hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubsti
  • the plurality of host materials according to one embodiment of the present disclosure comprises a first host material comprising the compound represented by formula 1 and a second host material comprising the compound represented by formula 2, and may be comprised in a light-emitting layer of an organic electroluminescent device according to one embodiment of the present disclosure.
  • B 1 to B 7 each independently, are not present, or represent a substituted or unsubstituted (C5-C20) ring, preferably a substituted or unsubstituted (C5-C13) ring, in which carbon atoms of the ring may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, with the proviso that at least five of B 1 to B 7 are present, and adjacent rings of B 1 to B 7 are fused with each other.
  • an adjacent ring may not be present, or may be a C5 ring, carbon atoms of which may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur.
  • B 1 to B 7 each independently, are not present, or represent a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted pyrrole ring, a substituted or unsubstituted furan ring, a substituted or unsubstituted thiophene ring, a substituted or unsubstituted cyclopentadiene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted pyridine ring, or a substituted or unsubstituted dibenzofuran ring.
  • B 1 to B 7 each independently, may not be present, or may represent a benzene ring unsubstituted or substituted with a phenyl(s), a naphthyl(s) and/or a diphenyltriazinyl(s); a naphthalene ring; a cyclopentadiene ring unsubstituted or substituted with a methyl(s); a fluorene ring substituted with a methyl(s); a pyrrole ring substituted with an unsubstituted phenyl(s), a phenyl(s) substituted with at least one deuterium, a biphenyl(s) and/or a pyridiyl(s); a furan ring; a thiophene ring; a pyridine ring; or a dibenzofuran ring unsubstituted or substituted with a diphenyltriaziny
  • Y represents —N(L 1 -(Ar 1 ) n )—, —O—, —S—, or —C(R 1 )(R 2 )—. According to one embodiment of the present disclosure, Y represents —N(L 1 -(Ar 1 ) n )—.
  • L 1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene.
  • L 1 represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene.
  • L 1 represents a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 25-membered)heteroarylene.
  • L 1 may be a single bond, a phenylene, a naphthylene, a biphenylene, a pyridylene, a pyrimidinylene, a triazinylene, a quinoxalinylene, a quinazolinylene, a dibenzofuranylene, a benzofuropyrimidinylene, a benzothienopyrimidinylene, an indolopyrimidinylene, or a benzoquinoxalinylene.
  • Ar 1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —N(R 3 )(R 4 ). According to one embodiment of the present disclosure, Ar 1 represents a substituted or unsubstituted (C6-C25)aryl, a substituted or unsubstituted (5- to 25-membered)heteroaryl, or —N(R 3 )(R 4 ).
  • Ar 1 represents a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C6)alkyl(s), and a (3- to 30-membered)heteroaryl(s); a (5- to 25-membered)heteroaryl unsubstituted or substituted with at least one of deuterium, a (C6-C18)aryl(s), and a (3- to 30-membered)heteroaryl(s); or —N(R 3 )(R 4 ).
  • Ar 1 may be an unsubstituted phenyl, a phenyl substituted with at least one deuterium, a phenyl substituted with a 26-membered heteroaryl(s), a naphthyl, a biphenyl, a fluorenyl substituted with a methyl(s), a spirobifluorenyl, a terphenyl, a triphenylenyl, a pyridyl unsubstituted and substituted with a phenyl(s), a pyrmidinyl substituted with a phenyl(s), a substituted triazinyl, a substituted quinoxalinyl, a substituted quinazolinyl, a benzoquinoxalinyl substituted with a phenyl(s), a carbazolyl, a dibenzofuranyl, a dibenzothiophenyl, a benzofuropyr
  • the substituents of the substituted triazinyl, the substituted quinoxalinyl, and the substituted quinazolinyl may be at least one selected from the group consisting of a phenyl unsubstituted or substituted with at least one of deuterium and a 26-membered heteroaryl(s), a naphthyl, a biphenyl, a terphenyl, a dibenzofuranyl, a pyridyl substituted with a phenyl(s), a dimethylfluorenyl, and a dibenzothiophenyl.
  • R 1 to R 4 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent to form a ring(s).
  • R 1 to R 4 each independently, represent hydrogen, deuterium, a substituted or unsubstituted (C1-C20)alkyl, or a substituted or unsubstituted (C6-C25)aryl.
  • R 1 and R 2 each independently, represent an unsubstituted (C1-C10)alkyl
  • R 3 and R 4 each independently, represent an unsubstituted (C6-C18)aryl.
  • R 1 and R 2 may be a methyl
  • R 3 and R 4 may be a phenyl.
  • n an integer of 1 or 2, where if n is 2, each of Ar 1 may be the same or different
  • Formula 1 may be represented by at least one of the following formulas 1-1 to 1-4.
  • Y 1 , Y 2 , Y 3 , and Y 4 are the same as the definition of Y in formula 1, where if a plurality of Ar 1 's are present, each of Ar 1 may be the same or different;
  • X 1 to X 12 each independently, represent —N ⁇ or —C(R a ) ⁇ ;
  • R a each independently, represents hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or adjacent R a 's may be linked to each other to form a ring(s), where if a plurality of R a
  • R a represents hydrogen, deuterium, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl; or adjacent R a 's may be linked to each other to form a ring(s).
  • R a represents hydrogen, an unsubstituted (C6-C18)aryl, or a (5- to 25-membered)heteroaryl substituted with a (C6-C18)aryl(s); or adjacent R a 's may be linked to each other to form a benzene ring(s), an indene ring(s) substituted with a methyl(s), or a benzofuran ring(s) unsubstituted or substituted with a diphenyltriazinyl(s).
  • At least one of Ar 1 (s) and R a (s), each independently, may be at least one selected from those listed in the following group 1.
  • D1 and D2 each independently, represent a benzene ring or a naphthalene ring;
  • X 21 represents O, S, NR 5 , or C(R 6 )(R 7 );
  • X 22 each independently, represents CR or N, with the proviso that at least one of X 22 represents N;
  • X 23 each independently, represents CR 9 or N;
  • L 11 to L 18 each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
  • R 11 to R 21 and R 5 to R 9 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3
  • D1 may be a benzene ring
  • X 21 may be O, S, or C(R 6 )(R 7 );
  • L 11 to L 18 each independently, may be a single bond;
  • R 11 to R 21 and R 5 to R 9 each independently, may be hydrogen, deuterium, a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl, or may be linked to an adjacent substituent to form a ring(s);
  • aa, bb, ff, and gg each independently, may be an integer of 1 to 5
  • cc, dd, and ee each independently, may be an integer of 1 to 4.
  • R 11 may be hydrogen, deuterium, a phenyl, a biphenyl, or a 26-membered heteroaryl
  • R 12 may be hydrogen, or adjacent R 12 's may be linked to each other to form a benzene ring(s)
  • R 13 , R 18 , and R 17 may be hydrogen
  • R 18 and R 19 may be hydrogen or a phenyl
  • R 21 may be phenyl
  • R 6 and R 7 may be a methyl
  • R 8 may be hydrogen, a phenyl, a biphenyl, a dibenzofuranyl, or a dibenzothiophenyl, or adjacent R 8 's may be linked to each other to form a benzene ring(s)
  • R 9 may be hydrogen, an unsubstituted phenyl, a phenyl substituted with at least one deuterium, a phenyl substituted with a 26-membered heteroaryl(s), a
  • At least one of Ar 1 (s) and R a (s), each independently, may be at least one selected from those listed in the following group 2.
  • L represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene; and A 1 to A 3 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl.
  • L represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (3- to 25-membered)heteroarylene; and A 1 to A 3 , each independently, represent a substituted or unsubstituted (C1-C20)alkyl, or a substituted or unsubstituted (C6-C25)aryl.
  • a 1 and A 2 may be the same or different.
  • a 1 and A 2 each independently, may be a methyl or a phenyl.
  • At least one of Ar 1 (s) and R a (s), each independently, may be at least one selected from those listed in the following group 3.
  • formula 2 may be represented by at least one selected from the following formulas 2-1 to 2-8.
  • X, Z, HAr, R 31 to R 36 , L 2 and a′ to d′ are as defined in formula 2;
  • Z 1 to Z 5 and Z 11 to Z 17 each independently, represent N or CR 37 ;
  • R 37 each independently, is the same as the definition of R 32 of formula 2.
  • R 37 each independently, represents hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl.
  • R 37 each independently, represents hydrogen; deuterium; a (C6-C18)aryl unsubstituted or substituted with at least one of a (C1-C10)alkyl(s) and a di(C6-C18)arylamino(s); or a (5- to 20-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s).
  • R 37 may be hydrogen, a phenyl unsubstituted or substituted with a diphenylamino(s), a naphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a dibenzothiophenyl, a dibenzofuranyl, a benzonaphthothiophenyl, a phenylcarbazolyl, or a phenylbenzocarbazolyl.
  • X represents —N ⁇ , —NR 35 —, —O— or —S—
  • Z represents —N ⁇ , —NR 36 —, —O— or —S—
  • X represents —N ⁇ , —NR 35 —, —O— or —S—
  • Z represents —N ⁇ , —NR 36 —, —O— or —S—
  • R 35 and R 36 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6
  • R 35 and R 36 each independently, represent a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl.
  • R 35 and R 36 each independently, represent an unsubstituted (C6-C18)aryl.
  • R 35 and R 36 may be a phenyl.
  • HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to one embodiment of the present disclosure, HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl containing a nitrogen atom(s). According to another embodiment of the present disclosure, HAr represents a substituted or unsubstituted (5- to 25-membered)heteroaryl containing a nitrogen atom(s).
  • HAr represents a (5- to 20-membered)heteroaryl containing a nitrogen atom(s), substituted with a (5- to 25-membered)heteroaryl(s) and/or a (C6-C25)aryl(s).
  • HAr may be a substituted or unsubstituted triazinyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted benzoquinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted benzoquinoxalinyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted benzoquinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted benzoisoquinolyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted naphth
  • HAr may be a substituted triazinyl, a substituted pyrimidinyl, a substituted quinoxalinyl, a substituted quinazolinyl, or a substituted naphthyridinyl.
  • the substituents of the substituted triazinyl, the substituted pyrimidinyl, the substituted quinoxalinyl, the substituted quinazolinyl, and the substituted naphthyridinyl may be at least one of a phenyl unsubstituted or substituted with a diphenylamino(s), a naphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a dibenzothiophenyl, a dibenzofuranyl, a benzonaphthothiophenyl, a phenylcarbazolyl, and a phenylbenzocarbazolyl.
  • R 31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to one embodiment of the present disclosure, R 31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl.
  • R 31 represents a (C6-C29)aryl unsubstituted or substituted with at least one of a (C1-C10)alkyl(s) and a (C6-C18)aryl(s); or a (5- to 25-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s).
  • R 31 may be a phenyl, a naphthyl, a phenylnaphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a spirobifluorenyl, a spiro[fluoren-benzofluoren]yl, a phenylcarbazolyl, a phenylbenzocarbazolyl, a dibenzofuranyl, or a dibenzothiophenyl.
  • R 32 to R 34 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri
  • L 2 and L 3 each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene.
  • L 2 and L 3 each independently, represent a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (5- to 25-membered)heteroarylene.
  • L 2 and L 3 each independently, represent a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 20-membered)heteroarylene.
  • L 2 and L 3 each independently, may be a single bond, a phenylene, or a pyridylene.
  • Ar 2 and Ar 3 each independently, represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl.
  • a′ represents 1, b′ and c′, each independently, represent an integer of 1 or 2
  • d′ represents an integer of 1 to 4, where if each of b′, c′ and d′ is an integer of 2 or more, each of R 32 to each of R 34 may be the same or different.
  • the compound represented by formula 1 may be at least one selected from the following compounds, but is not limited thereto.
  • the compound represented by formula 2 may be at least one selected from the following compounds, but is not limited thereto.
  • the combination of at least one of compounds C-1 to C-300 and at least one of compounds C2-1 to C2-125 may be used in an organic electroluminescent device.
  • the compound represented by formula 1 of the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, according to the following reaction schemes 1 to 4, but is not limited thereto:
  • the compound represented by formula 2 of the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, according to the methods disclosed in Korean Patent Application Laying-Open No. 2020-0000329 (published on Jan. 2, 2020), etc.
  • non-deuterated analogues of the compound represented by formula 2 can be prepared by known coupling and substitution reactions.
  • the non-deuterated analogues may be prepared in a similar manner by using deuterated precursor materials, or more generally may be prepared by treating the non-deuterated compound with a deuterated solvent or D6-benzene in the presence of an H/D exchange catalyst such as a Lewis acid, e.g., aluminum trichloride or ethyl aluminum chloride, a trifluoromethanesulfonic acid, or a trifluoromethanesulfonic acid-D.
  • an H/D exchange catalyst such as a Lewis acid, e.g., aluminum trichloride or ethyl aluminum chloride, a trifluoromethanesulfonic acid, or a trifluoromethanesulfonic acid-D.
  • the degree of deuteration can be controlled by changing the reaction conditions such as the reaction temperature.
  • the organic electroluminescent device may comprise an anode, a cathode, and at least one organic layer between the anode and cathode in which the organic layer may comprise a plurality of organic electroluminescent materials, including the compound represented by formula 1 as the first organic electroluminescent material, and the compound represented by formula 2 as the second organic electroluminescent material.
  • the organic electroluminescent device according to the present disclosure may comprise an anode, a cathode, and at least one light-emitting layer between the anode and cathode in which the light-emitting layer may comprise the compound represented by formula 1 and the compound represented by formula 2.
  • the light-emitting layer includes a host and a dopant, in which the host includes a plurality of host materials and the compound represented by formula 1 may be included as the first host compound of the plurality of host materials, and the compound represented by formula 2 may be included as the second host compound of the plurality of host materials.
  • the weight ratio of the first host compound and the second host compound is about 1:99 to about 99:1, preferably about 10:90 to about 90:10, more preferably about 30:70 to about 70:30, even more preferably about 40:60 to about 60:40, and most preferably about 50:50.
  • the light-emitting layer is a layer from which light is emitted, and may be a single layer or a multi-layer of which two or more layers are stacked. All of the first host material and the second host material may be included in one layer, or the first host material and the second host material may be included in respective different light-emitting layers. According to one embodiment of the present disclosure, the doping concentration of the dopant compound with respect to the host compound in the light-emitting layer may be less than 20 wt %.
  • the organic electroluminescent device of the present disclosure may further comprise at least one layer selected from a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron transport layer, an electron injection layer, an interlayer, an electron buffer layer, a hole blocking layer, and an electron blocking layer.
  • the organic electroluminescent device of the present disclosure may further comprise an amine-based compound besides the plurality of host materials of the present disclosure as at least one of a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting material, a light-emitting auxiliary material, and an electron blocking material.
  • the organic electroluminescent device of the present disclosure may further comprise an azine-based compound besides the plurality of host materials of the present disclosure as at least one of an electron transport material, an electron injection material, an electron buffer material, and a hole blocking material.
  • the plurality of host materials according to the present disclosure may be used as light-emitting materials for a white organic light-emitting device.
  • the white organic light-emitting device has been suggested to have various structures such as a parallel arrangement (side-by-side) method, a stacking method, or color conversion material (CCM) method, etc., according to the arrangement of R (red), G (green) or YG (yellowish green), B (blue) light-emitting units.
  • the plurality of host materials according to one embodiment of the present disclosure may also be used in an organic electroluminescent device comprising a quantum dot (QD).
  • QD quantum dot
  • a hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof can be used between the anode and the light-emitting layer.
  • the hole injection layer may be multilayers in order to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, wherein each of the multilayers may use two compounds simultaneously. Further, the hole injection layer may be doped with a p-dopant.
  • the electron blocking layer may be placed between the hole transport layer (or hole injection layer) and the light-emitting layer, and may block overflowing electrons from the light-emitting layer and confine the excitons in the light-emitting layer to prevent light leakage.
  • the hole transport layer or the electron blocking layer may also be multilayers, wherein each of the multilayers may use a plurality of compounds.
  • An electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof can be used between the light-emitting layer and the cathode.
  • the electron buffer layer may be multilayers in order to control the electron injection and improve the interfacial properties between the light-emitting layer and the electron injection layer, wherein each of the multilayers may use two compounds simultaneously.
  • the hole blocking layer or the electron transport layer may also be multilayers, wherein each of the multilayers may use a plurality of compounds.
  • the electron injection layer may be doped with an n-dopant.
  • the dopant comprised in the organic electroluminescent device of the present disclosure may be at least one phosphorescent or fluorescent dopant, and is preferably phosphorescent dopant.
  • the phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but may be preferably selected from the metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably selected from ortho-metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably ortho-metallated iridium complex compounds.
  • the dopant comprised in the organic electroluminescent device of the present disclosure may comprise a compound represented by the following formula 101, but is not limited thereto.
  • L′ is selected from the following structures 1 to 3:
  • R 100 to R 103 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a cyano, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, quinoline, isoquinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline, or indenoquinoline, together with pyridine;
  • R 104 to R 107 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a cyano, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine, or benzothienopyridine, together with benzene;
  • R 201 to R 220 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to an adjacent substituent to form a ring(s); and
  • s represents an integer of 1 to 3.
  • dopant compound is as follows, but are not limited thereto.
  • dry film-forming methods such as vacuum evaporation, sputtering, plasma, ion plating methods, etc.
  • wet film-forming methods such as ink jet printing, nozzle printing, slot coating, spin coating, dip coating, flow coating methods, etc.
  • a thin film can be formed by dissolving or diffusing materials forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc.
  • the solvent can be any solvent where the materials forming each layer can be dissolved or diffused, and where there are no problems in film-formation capability.
  • the first and the second host compounds of the present disclosure may be film-formed by the above-listed methods, commonly by a co-evaporation process or a mixture-evaporation process.
  • the co-evaporation is a mixed deposition method in which two or more materials are placed in a respective individual crucible source and a current is applied to both cells at the same time to evaporate the materials.
  • the mixture-evaporation is a mixed deposition method in which two or more materials are mixed in one crucible source before evaporating them, and a current is applied to the cell to evaporate the materials.
  • the two host compounds may individually form films.
  • the second host compound may be deposited after depositing the first host compound.
  • the present disclosure may provide a display device by using the plurality of host materials including the compound represented by formula 1 and the compound represented by formula 2. That is, by using the plurality of host materials of the present disclosure, it is possible to manufacture a display system or a lighting system. Specifically, by using the plurality of host materials of the present disclosure, a display system, for example, for white organic light emitting devices, smart phones, tablets, notebooks, PCs, TVs, or cars; or a lighting system, for example an outdoor or indoor lighting system, can be produced.
  • reaction mixture was cooled to room temperature, filtered by cellite with methylene chloride (MC), distilled under reduced pressure, and then separated by column chromatography with methylene chloride/hexane (MC/Hex) to obtain compound C2-86 (2.7 g, yield: 57%).
  • MC methylene chloride
  • OLEDs according to the present disclosure were produced.
  • a transparent electrode indium tin oxide (ITO) thin film (10 ⁇ /sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to an ultrasonic washing with acetone and isopropyl alcohol, sequentially, and then was stored in isopropyl alcohol.
  • the ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus.
  • Compound HI-1 shown in Table 2 as a first hole injection compound was introduced into a cell of the vacuum vapor deposition apparatus, and compound HT-1 shown in Table 2 was introduced into another cell of the vacuum vapor deposition apparatus.
  • compound HI-1 was deposited in a doping amount of 3 wt % based on the total amount of compound HI-1 and compound HT-1 to form a hole injection layer having a thickness of 10 nm on the ITO substrate.
  • compound HT-1 was deposited on the hole injection layer to form a first hole transport layer having a thickness of 80 nm.
  • Compound HT-2 was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer.
  • a light-emitting layer was formed thereon as follows:
  • the first host compound and the second host compound shown in Table 1 below were introduced into two cells of the vacuum vapor depositing apparatus as hosts, and compound D-71 was introduced into another cell as a dopant.
  • the two host materials were evaporated at a rate of 1:1 and the dopant material was simultaneously evaporated at a different rate, and the dopant was deposited in a doping amount of 3 wt % based on the total amount of the hosts and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer.
  • Compound ETL-1 and compound EIL-1 were evaporated in a weight ratio of 50:50 to form an electron transport layer having a thickness of 35 nm on the light-emitting layer.
  • an Al cathode having a thickness of 80 nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus.
  • an OLED was produced. All the materials used for producing the OLED were purified by vacuum sublimation at 10 ⁇ 8 torr.
  • Comparative Examples 1 to 3 Producing an OLED Comprising a Comparative Compound as a Host
  • OLEDs were produced in the same manner as in Device Example 1, except that the compound shown in Table 1 below was used alone as a first host or a second host.
  • the driving voltage, luminous efficiency, and light-emitting color at a luminance of 1,000 nit, and the time taken for luminance to decrease from 100% to 95% at a luminance of 5,000 nit (lifetime; T95) of the OLEDs produced in Device Examples 1 to 3, and Comparative Examples 1 to 3 are provided in Table 1 below.
  • the OLEDs comprising the plurality of host materials according to the present disclosure as host materials have improved driving voltage, luminous efficiency, and/or lifespan property, compared to the conventional OLED.
  • the HOMO highest occupied molecular orbital
  • the hole injection from a hole transport layer becomes easier, and the balance between hole and electron and the formation of exciton may be improved, thereby improving the driving voltage, luminous efficiency and/or lifetime property of an OLED.

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Abstract

The present disclosure relates to a plurality of host materials comprising at least one first host compound and at least one second host compound, and an organic electroluminescent device comprising the same. By comprising a specific combination of the compounds wherein the first host compound is represented by formula 1 and the second host compound is represented by formula 2, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, power efficiency and/or lifetime property.

Description

    TECHNICAL FIELD
  • The present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same.
    • BACKGROUND ART
  • A small molecular green organic electroluminescent device (OLED) was first developed by Tang, et al., of Eastman Kodak in 1987 by using TPD/ALq3 bi-layer consisting of a light-emitting layer and a charge transport layer. Thereafter, the development of OLEDs was rapidly effected and OLEDs have been commercialized. At present, OLEDs primarily use phosphorescent materials having excellent luminous efficiency in panel implementation. An OLED having high luminous efficiency and/or long lifetime characteristics is required for long time use and high resolution of a display.
  • In order to enhance luminous efficiency, driving voltage and/or lifetime, various materials or concepts for an organic layer of an organic electroluminescent device have been proposed. However, they were not satisfactory in practical use.
  • Korean Patent Application Laying-Open No. 2020-0000329 discloses a plurality of host materials comprising a compound having a heteroaryl bonded to a phenanthrene moiety and a compound having a heteroaryl bonded to a carbazole moiety. However, said reference does not specifically disclose a specific combination of host materials claimed in the present disclosure. In addition, development of a light-emitting material having improved performances, for example, improved driving voltage, luminous efficiency, power efficiency and/or lifetime property as compared with combinations of specific compounds conventionally disclosed is still required.
    • DISCLOSURE OF INVENTION Technical Problem
  • The objective of the present disclosure is to provide an organic electroluminescent device having low driving voltage, high luminous efficiency, high power efficiency and/or excellent lifetime property by comprising a plurality of host materials including a specific combination of compounds.
    • Solution to Problem
  • The present inventors found that the above objective can be achieved by a plurality of host materials comprising at least one first host compound and at least second host compound, wherein the first host compound is represented by the following formula 1, and the second host compound is represented by the following formula 2:
  • Figure US20220356193A1-20221110-C00001
  • wherein
  • B1 to B7, each independently, are not present, or represent a substituted or unsubstituted (C5-C20) ring, in which carbon atoms of the ring may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, with the proviso that at least five of B1 to B7 are present, and adjacent rings of B1 to B7 are fused with each other;
  • Y represents —N(L1-(Ar1)n)—, —O—, —S—, or —C(R1)(R2)—;
  • L1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
  • Ar1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —N(R3)(R4);
  • R1 to R4, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent to form a ring(s); and
  • n represents an integer of 1 or 2, where if n is 2, each of Ar1 may be the same or different;
  • Figure US20220356193A1-20221110-C00002
  • wherein
  • X represents —N═, —NR35—, —O— or —S—;
  • Z represents —N═, —NR36—, —O— or —S—, where if X represents —N═, Z represents —NR36—, —O— or —S—, and if X represents —NR35—, Z represents —N═, —O— or —S—;
  • HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl;
  • R31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
  • R32 to R34, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3); or may be linked to an adjacent substituent to form a ring(s);
  • R35 and R36, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3);
  • L2 and L3, each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
  • Ar2 and Ar3, each independently, represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and
  • a′ represents 1, b′ and c′, each independently, represent an integer of 1 or 2, and d′ represents an integer of 1 to 4, where if each of b′, c′ and d′ is an integer of 2 or more, each of R32 to each of R34 may be the same or different.
    • Advantageous Effects of Invention
  • By comprising a plurality of host materials according to the present disclosure, an organic electroluminescent device having lower driving voltage, higher luminous efficiency, higher power efficiency and/or better lifetime property compared to conventional organic electroluminescent devices can be provided, and it is possible to produce a display system or a lighting system using the same.
    • MODE FOR THE INVENTION
  • Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the invention and is not meant in any way to restrict the scope of the present disclosure.
  • The term “organic electroluminescent material” in the present disclosure means a material that may be used in an organic electroluminescent device, and may comprise at least one compound. The organic electroluminescent material may be comprised in any layer constituting an organic electroluminescent device as necessary. For example, the organic electroluminescent material may be a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material (including a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc.
  • The term “a plurality of organic electroluminescent materials” in the present disclosure means an organic electroluminescent material comprising a combination of at least two compounds, which may be comprised in any layer constituting an organic electroluminescent device. It may mean both a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) and a material after being comprised in an organic electroluminescent device (for example, after vapor deposition). For example, a plurality of organic electroluminescent materials of the present disclosure may be a combination of at least two compounds, which may be comprised in at least one layer of a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron blocking layer, a light-emitting layer, an electron buffer layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The at least two compounds may be comprised in the same layer or different layers, and may be mixture-evaporated or co-evaporated, or may be individually evaporated.
  • The term “a plurality of host materials” in the present disclosure means an organic electroluminescent material comprising a combination of at least two host materials. It may mean both a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) and a material after being comprised in an organic electroluminescent device (for example, after vapor deposition). The plurality of host materials of the present disclosure may be comprised in any light-emitting layer constituting an organic electroluminescent device. At least two compounds comprised in the plurality of host materials of the present disclosure may be comprised together in one light-emitting layer or may respectively be comprised in different light-emitting layers. When at least two host materials are comprised in one layer, for example, they may be mixture-evaporated to form a layer or may be separately co-evaporated at the same time to form a layer.
  • Herein, the term “(C1-C30)alkyl” is meant to be a linear or branched alkyl having 1 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 1 to 20, and more preferably 1 to 10. The above alkyl may include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, etc. The term “(C2-C30)alkenyl” is meant to be a linear or branched alkenyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10. The above alkenyl may include vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc. The term “(C2-C30)alkynyl” is meant to be a linear or branched alkynyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10. The above alkynyl may include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc. The term “(C3-C30)cycloalkyl” is meant to be a mono- or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, in which the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7. The above cycloalkyl may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. The term “(3- to 7-membered)heterocycloalkyl” is meant to be a cycloalkyl having 3 to 7, preferably 5 to 7, ring backbone atoms, and including at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, and preferably the group consisting of O, S, and N. The above heterocycloalkyl may include tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, etc. The term “(C6-C30)aryl(ene)” is meant to be a monocyclic or fused ring radical derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms, in which the number of the ring backbone carbon atoms is preferably 6 to 25, and more preferably 6 to 18. The above aryl(ene) may be partially saturated, and may comprise a spiro structure. The above aryl may include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, phenylterphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, azulenyl, etc. More specifically, the above aryl may include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthacenyl, pyrenyl, 1-chrysenyl, 2-chrysenyl, 3-chrysenyl, 4-chrysenyl, 5-chrysenyl, 6-chrysenyl, benzo[c]phenanthryl, benzo[g]chrysenyl, 1-triphenylenyl, 2-triphenylenyl, 3-triphenylenyl, 4-triphenylenyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, benzo[a]fluorenyl, benzo[b]fluorenyl, benzo[c]fluorenyl, dibenzofluorenyl, 2-biphenyl, 3-biphenylyl, 4-biphenylyl, o-terphenyl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-quaterphenyl, 3-fluoranthenyl, 4-fluoranthenyl, 8-fluoranthenyl, 9-fluoranthenyl, benzofluoranthenyl, o-tolyl, m-tolyl, p-tolyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl, o-cumenyl, m-cumenyl, p-cumenyl, p-t-butylphenyl, p-(2-phenylpropyl)phenyl, 4′-methylbiphenylyl, 4″-t-butyl-p-terphenyl-4-yl, 9,9-dimethyl-1-fluorenyl, 9,9-dimethyl-2-fluorenyl, 9,9-dimethyl-3-fluorenyl, 9,9-dimethyl-4-fluorenyl, 9,9-diphenyl-1-fluorenyl, 9,9-diphenyl-2-fluorenyl, 9,9-diphenyl-3-fluorenyl, 9,9-diphenyl-4-fluorenyl, 11,11-dimethyl-1-benzo[a] fluorenyl, 11,11-dimethyl-2-benzo[a] fluorenyl, 11,11-dimethyl-3-benzo[a]fluorenyl, 11,11-dimethyl-4-benzo[a] fluorenyl, 11,11-dimethyl-5-benzo[a] fluorenyl, 11,11-dimethyl-6-benzo[a] fluorenyl, 11,11-dimethyl-7-benzo[a] fluorenyl, 11,11-dimethyl-8-benzo[a]fluorenyl, 11,11-dimethyl-9-benzo[a] fluorenyl, 11,11-dimethyl-10-benzo[a] fluorenyl, 11,11-dimethyl-1-benzo[b] fluorenyl, 11,11-dimethyl-2-benzo[b] fluorenyl, 11,11-dimethyl-3-benzo[b]fluorenyl, 11,11-dimethyl-4-benzo[b] fluorenyl, 11,11-dimethyl-5-benzo[b] fluorenyl, 11,11-dimethyl-6-benzo[b] fluorenyl, 11,11-dimethyl-7-benzo[b] fluorenyl, 11,11-dimethyl-8-benzo[b]fluorenyl, 11,11-dimethyl-9-benzo[b] fluorenyl, 11,11-dimethyl-10-benzo[b] fluorenyl, 11,11-dimethyl-1-benzo[c] fluorenyl, 11,11-dimethyl-2-benzo[c] fluorenyl, 11,11-dimethyl-3-benzo[c]fluorenyl, 11,11-dimethyl-4-benzo[c] fluorenyl, 11,11-dimethyl-5-benzo[c] fluorenyl, 11,11-dimethyl-6-benzo[c] fluorenyl, 11,11-dimethyl-7-benzo[c] fluorenyl, 11,11-dimethyl-8-benzo[c]fluorenyl, 11,11-dimethyl-9-benzo[c] fluorenyl, 11,11-dimethyl-10-benzo[c] fluorenyl, 11,11-diphenyl-1-benzo[a] fluorenyl, 11,11-diphenyl-2-benzo[a] fluorenyl, 11,11-diphenyl-3-benzo[a]fluorenyl, 11,11-diphenyl-4-benzo[a] fluorenyl, 11,11-diphenyl-5-benzo[a] fluorenyl, 11,11-diphenyl-6-benzo[a] fluorenyl, 11,11-diphenyl-7-benzo[a] fluorenyl, 11,11-diphenyl-8-benzo[a]fluorenyl, 11,11-diphenyl-9-benzo[a] fluorenyl, 11,11-diphenyl-10-benzo[a] fluorenyl, 11,11-diphenyl-1-benzo[b] fluorenyl, 11,11-diphenyl-2-benzo[b] fluorenyl, 11,11-diphenyl-3-benzo[b]fluorenyl, 11,11-diphenyl-4-benzo[b] fluorenyl, 11,11-diphenyl-5-benzo[b] fluorenyl, 11,11-diphenyl-6-benzo[b] fluorenyl, 11,11-diphenyl-7-benzo[b] fluorenyl, 11,11-diphenyl-8-benzo[b]fluorenyl, 11,11-diphenyl-9-benzo[b] fluorenyl, 11,11-diphenyl-10-benzo[b] fluorenyl, 11,11-diphenyl-1-benzo[c] fluorenyl, 11,11-diphenyl-2-benzo[c] fluorenyl, 11,11-diphenyl-3-benzo[c]fluorenyl, 11,11-diphenyl-4-benzo[c] fluorenyl, 11,11-diphenyl-5-benzo[c] fluorenyl, 11,11-diphenyl-6-benzo[c] fluorenyl, 11,11-diphenyl-7-benzo[c] fluorenyl, 11,11-diphenyl-8-benzo[c]fluorenyl, 11,11-diphenyl-9-benzo[c] fluorenyl, 11,11-diphenyl-10-benzo[c] fluorenyl, etc.
  • The term “(3- to 30-membered)heteroaryl” or “(3- to 50-membered)heteroaryl” is meant to be an aryl having 3 to 30 ring backbone atoms or 3 to 50 ring backbone atoms, and including at least one, preferably 1 to 4 heteroatoms selected from the group consisting of B, N, O, S, Si, and P. The above heteroaryl may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and may comprise a spiro structure. The above heteroaryl may include a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl, and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzoindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalinyl, naphthyridinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenothiazinyl, phenanthridinyl, benzodioxolyl, and dihydroacridinyl. More specifically, the above heteroaryl may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridinyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazin-4-yl, 1,2,4-triazin-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5-indolidinyl, 6-indolidinyl, 7-indolidinyl, 8-indolidinyl, 2-imidazopyridinyl, 3-imidazopyridinyl, 5-imidazopyridinyl, 6-imidazopyridinyl, 7-imidazopyridinyl, 8-imidazopyridinyl, 3-pyridinyl, 4-pyridinyl, 1-indolyl, 2-indolyl, 3-indolyl, 4-indolyl, 5-indolyl, 6-indolyl, 7-indolyl, 1-isoindolyl, 2-isoindolyl, 3-isoindolyl, 4-isoindolyl, 5-isoindolyl, 6-isoindolyl, 7-isoindolyl, 2-furyl, 3-furyl, 2-benzofuranyl, 3-benzofuranyl, 4-benzofuranyl, 5-benzofuranyl, 6-benzofuranyl, 7-benzofuranyl, 1-isobenzofuranyl, 3-isobenzofuranyl, 4-isobenzofuranyl, 5-isobenzofuranyl, 6-isobenzofuranyl, 7-isobenzofuranyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 6-quinolyl, 7-quinolyl, 8-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl, 6-isoquinolyl, 7-isoquinolyl, 8-isoquinolyl, 2-quinoxalinyl, 5-quinoxalinyl, 6-quinoxalinyl, 1-carbazolyl, 2-carbazolyl, 3-carbazolyl, 4-carbazolyl, 9-carbazolyl, azacarbazolyl-1-yl, azacarbazolyl-2-yl, azacarbazolyl-3-yl, azacarbazolyl-4-yl, azacarbazolyl-5-yl, azacarbazolyl-6-yl, azacarbazolyl-7-yl, azacarbazolyl-8-yl, azacarbazolyl-9-yl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinyl, 2-acridinyl, 3-acridinyl, 4-acridinyl, 9-acridinyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 3-furazanyl, 2-thienyl, 3-thienyl, 2-methylpyrrol-1-yl, 2-methylpyrrol-3-yl, 2-methylpyrrol-4-yl, 2-methylpyrrol-5-yl, 3-methylpyrrol-1-yl, 3-methylpyrrol-2-yl, 3-methylpyrrol-4-yl, 3-methylpyrrol-5-yl, 2-t-butylpyrrol-4-yl, 3-(2-phenylpropyl)pyrrol-1-yl, 2-methyl-1-indolyl, 4-methyl-1-indolyl, 2-methyl-3-indolyl, 4-methyl-3-indolyl, 2-t-butyl-1-indolyl, 4-t-butyl-1-indolyl, 2-t-butyl-3-indolyl, 4-t-butyl-3-indolyl, 1-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzofuranyl, 1-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho-[1,2-b]-benzofuranyl, 2-naphtho-[1,2-b]-benzofuranyl, 3-naphtho-[1,2-b]-benzofuranyl, 4-naphtho-[1,2-b]-benzofuranyl, 5-naphtho-[1,2-b]-benzofuranyl, 6-naphtho-[1,2-b]-benzofuranyl, 7-naphtho-[1,2-b]-benzofuranyl, 8-naphtho-[1,2-b]-benzofuranyl, 9-naphtho-[1,2-b]-benzofuranyl, 10-naphtho-[1,2-b]-benzofuranyl, 1-naphtho-[2,3-b]-benzofuranyl, 2-naphtho-[2,3-b]-benzofuranyl, 3-naphtho-[2,3-b]-benzofuranyl, 4-naphtho-[2,3-b]-benzofuranyl, 5-naphtho-[2,3-b]-benzofuranyl, 6-naphtho-[2,3-b]-benzofuranyl, 7-naphtho-[2,3-b]-benzofuranyl, 8-naphtho-[2,3-b]-benzofuranyl, 9-naphtho-[2,3-b]-benzofuranyl, 10-naphtho-[2,3-b]-benzofuranyl, 1-naphtho-[2,1-b]-benzofuranyl, 2-naphtho-[2,1-b]-benzofuranyl, 3-naphtho-[2,1-b]-benzofuranyl, 4-naphtho-[2,1-b]-benzofuranyl, 5-naphtho-[2,1-b]-benzofuranyl, 6-naphtho-[2,1-b]-benzofuranyl, 7-naphtho-[2,1-b]-benzofuranyl, 8-naphtho-[2,1-b]-benzofuranyl, 9-naphtho-[2,1-b]-benzofuranyl, 10-naphtho-[2,1-b]-benzofuranyl, 1-naphtho-[1,2-b]-benzothiophenyl, 2-naphtho-[1,2-b]-benzothiophenyl, 3-naphtho-[1,2-b]-benzothiophenyl, 4-naphtho-[1,2-b]-benzothiophenyl, 5-naphtho-[1,2-b]-benzothiophenyl, 6-naphtho-[1,2-b]-benzothiophenyl, 7-naphtho-[1,2-b]-benzothiophenyl, 8-naphtho-[1,2-b]-benzothiophenyl, 9-naphtho-[1,2-b]-benzothiophenyl, 10-naphtho-[1,2-b]-benzothiophenyl, 1-naphtho-[2,3-b]-benzothiophenyl, 2-naphtho-[2,3-b]-benzothiophenyl, 3-naphtho-[2,3-b]-benzothiophenyl, 4-naphtho-[2,3-b]-benzothiophenyl, 5-naphtho-[2,3-b]-benzothiophenyl, 1-naphtho-[2,1-b]-benzothiophenyl, 2-naphtho-[2,1-b]-benzothiophenyl, 3-naphtho-[2,1-b]-benzothiophenyl, 4-naphtho-[2,1-b]-benzothiophenyl, 5-naphtho-[2,1-b]-benzothiophenyl, 6-naphtho-[2,1-b]-benzothiophenyl, 7-naphtho-[2,1-b]-benzothiophenyl, 8-naphtho-[2,1-b]-benzothiophenyl, 9-naphtho-[2,1-b]-benzothiophenyl, 10-naphtho-[2,1-b]-benzothiophenyl, 1-silafluorenyl, 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germafluorenyl, 2-germafluorenyl, 3-germafluorenyl, 4-germafluorenyl, etc. Furthermore, “halogen” includes F, Cl, Br, and I.
  • In addition, “ortho (o-),” “meta (m-),” and “para (p-)” are prefixes, which represent the relative positions of substituents respectively. Ortho indicates that two substituents are adjacent to each other, and for example, when two substituents in a benzene derivative occupy positions 1 and 2, it is called an ortho position. Meta indicates that two substituents are at positions 1 and 3, and for example, when two substituents in a benzene derivative occupy positions 1 and 3, it is called a meta position. Para indicates that two substituents are at positions 1 and 4, and for example, when two substituents in a benzene derivative occupy positions 1 and 4, it is called a para position.
  • Herein, “substituted” in the expression “substituted or unsubstituted” means that a hydrogen atom in a certain functional group is replaced with another atom or another functional group, i.e., a substituent. The substituents of the substituted alkyl, the substituted alkylene, the substituted alkenyl, the substituted aryl, the substituted arylene, the substituted heteroaryl, the substituted heteroarylene, the substituted cycloalkyl, the substituted cycloalkylene, the substituted alkoxy, the substituted trialkylsilyl, the substituted dialkylarylsilyl, the substituted alkyldiarylsilyl, the substituted triarylsilyl, the substituted fused ring of an aliphatic ring(s) and an aromatic ring(s), and the substituted ring in the formulas of the present disclosure, each independently, are at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; a (C1-C30)alkyl; a halo(C1-C30)alkyl; a (C2-C30)alkenyl; a (C2-C30)alkynyl; a (C1-C30)alkoxy; a (C1-C30)alkylthio; a (C3-C30)cycloalkyl; a (C3-C30)cycloalkenyl; a (3- to 7-membered)heterocycloalkyl; a (C6-C30)aryloxy; a (C6-C30)arylthio; a (3- to 50-membered)heteroaryl unsubstituted or substituted with at least one of a (C1-C30)alkyl(s), a (C6-C30)aryl(s), and a di(C6-C30)arylamino(s); a (C6-C30)aryl unsubstituted or substituted with at least one of deuterium, a cyano(s), a (C1-C30)alkyl(s), a (3- to 50-membered)heteroaryl(s), a mono- or di-(C6-C30)arylamino(s), and a tri(C6-C30)arylsilyl(s); a tri(C1-C30)alkylsilyl; a tri(C6-C30)arylsilyl; a di(C1-C30)alkyl(C6-C30)arylsilyl; a (C1-C30)alkyldi(C6-C30)arylsilyl; an amino; a mono- or di-(C1-C30)alkylamino; a mono- or di-(C2-C30)alkenylamino; a mono- or di-(C6-C30)arylamino; a mono- or di-(3- to 30-membered)heteroarylamino; a (C1-C30)alkyl(C2-C30)alkenylamino; a (C1-C30)alkyl(C6-C30)arylamino; a (C1-C30)alkyl(3- to 30-membered)heteroarylamino; a (C2-C30)alkenyl(C6-C30)arylamino; a (C2-C30)alkenyl(3- to 30-membered)heteroarylamino; a (C6-C30)aryl(3- to 30-membered)heteroarylamino; a (C1-C30)alkylcarbonyl; a (C1-C30)alkoxycarbonyl; a (C6-C30)arylcarbonyl; a di(C6-C30)arylboronyl; a di(C1-C30)alkylboronyl; a (C1-C30)alkyl(C6-C30)arylboronyl; a (C6-C30)aryl(C1-C30)alkyl; and a (C1-C30)alkyl(C6-C30)aryl. According to one embodiment of the present disclosure, the substituents, each independently, are at least one selected from the group consisting of deuterium; a (C1-C20)alkyl; a (3- to 30-membered)heteroaryl unsubstituted or substituted with at least one of a (C1-C20)alkyl(s) and a (C6-C25)aryl(s); a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C20)alkyl(s), a (3- to 30-membered)heteroaryl(s), and a di(C6-C25)arylamino(s); and a mono- or di-(C6-C25)arylamino. According to another embodiment of the present disclosure, the substituents, each independently, are at least one selected from the group consisting of deuterium; a (C1-C10)alkyl; a (5- to 26-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s); a (C6-C20)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C10)alkyl(s), a (5- to 26-membered)heteroaryl(s), and a di(C6-C18)arylamino(s); and a di(C6-C18)arylamino. Specifically, the substituents, each independently, may be at least one selected from the group consisting of deuterium; a methyl; a phenyl unsubstituted or substituted with at least one of deuterium, a 26-membered heteroaryl(s), and a diphenylamino(s); a naphthyl; a biphenyl; a naphthylphenyl; a phenylnaphthyl; a phenanthrenyl; a dimethylfluorenyl; a dimethylbenzofluorenyl; a terphenyl; a triphenylenyl; a pyridyl unsubstituted or substituted with a phenyl(s); a triazinyl substituted with a phenyl(s); a dibenzofuranyl; a dibenzothiophenyl; a benzonaphthothiophenyl; a carbazolyl unsubstituted or substituted with a phenyl(s); a benzocarbazolyl unsubstituted or substituted with a phenyl(s); a dibenzocarbazolyl; a 26-membered heteroaryl; and a diphenylamino.
  • In the formulas of the present disclosure, if a substituent is linked to an adjacent substituent to form a ring, the ring may be a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof, which two or more adjacent substituents are linked to form. In addition, the formed ring may contain at least one heteroatom selected from B, N, O, S, Si, and P, preferably at least one heteroatom selected from N, O, and S. According to one embodiment of the present disclosure, the number of the ring backbone atoms is 5 to 20. According to another embodiment of the present disclosure, the number of the ring backbone atoms is 5 to 15.
  • In the formulas of the present disclosure, heteroaryl and heteroarylene may, each independently, contain at least one heteroatom selected from B, N, O, S, Si, and P. In addition, the heteroatom may be bonded to at least one selected from the group consisting of hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, and a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino.
  • The plurality of host materials according to one embodiment of the present disclosure comprises a first host material comprising the compound represented by formula 1 and a second host material comprising the compound represented by formula 2, and may be comprised in a light-emitting layer of an organic electroluminescent device according to one embodiment of the present disclosure.
  • Hereinafter, the compound represented by formula 1 will be described in more detail.
  • In formula 1, B1 to B7, each independently, are not present, or represent a substituted or unsubstituted (C5-C20) ring, preferably a substituted or unsubstituted (C5-C13) ring, in which carbon atoms of the ring may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, with the proviso that at least five of B1 to B7 are present, and adjacent rings of B1 to B7 are fused with each other. Herein, “adjacent rings of B1 to B7 are fused with each other” means that ring B1 and ring B2, ring B2 and ring B3, ring B3 and ring B4, ring B4 and ring B5, ring B5 and ring B6, or ring B6 and ring B7 are fused with each other. According to one embodiment of the present disclosure, if any one of B1 to B7, represents a (C6-C20)aryl, an adjacent ring may not be present, or may be a C5 ring, carbon atoms of which may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur. According to another embodiment of the present disclosure, B1 to B7 each independently, are not present, or represent a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted pyrrole ring, a substituted or unsubstituted furan ring, a substituted or unsubstituted thiophene ring, a substituted or unsubstituted cyclopentadiene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted pyridine ring, or a substituted or unsubstituted dibenzofuran ring. For example, B1 to B7, each independently, may not be present, or may represent a benzene ring unsubstituted or substituted with a phenyl(s), a naphthyl(s) and/or a diphenyltriazinyl(s); a naphthalene ring; a cyclopentadiene ring unsubstituted or substituted with a methyl(s); a fluorene ring substituted with a methyl(s); a pyrrole ring substituted with an unsubstituted phenyl(s), a phenyl(s) substituted with at least one deuterium, a biphenyl(s) and/or a pyridiyl(s); a furan ring; a thiophene ring; a pyridine ring; or a dibenzofuran ring unsubstituted or substituted with a diphenyltriazinyl(s).
  • In formula 1, Y represents —N(L1-(Ar1)n)—, —O—, —S—, or —C(R1)(R2)—. According to one embodiment of the present disclosure, Y represents —N(L1-(Ar1)n)—.
  • L1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene. According to one embodiment of the present disclosure, L1 represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene. According to another embodiment of the present disclosure, L1 represents a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 25-membered)heteroarylene. For example, L1 may be a single bond, a phenylene, a naphthylene, a biphenylene, a pyridylene, a pyrimidinylene, a triazinylene, a quinoxalinylene, a quinazolinylene, a dibenzofuranylene, a benzofuropyrimidinylene, a benzothienopyrimidinylene, an indolopyrimidinylene, or a benzoquinoxalinylene.
  • Ar1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —N(R3)(R4). According to one embodiment of the present disclosure, Ar1 represents a substituted or unsubstituted (C6-C25)aryl, a substituted or unsubstituted (5- to 25-membered)heteroaryl, or —N(R3)(R4). According to another embodiment of the present disclosure, Ar1 represents a (C6-C25)aryl unsubstituted or substituted with at least one of deuterium, a (C1-C6)alkyl(s), and a (3- to 30-membered)heteroaryl(s); a (5- to 25-membered)heteroaryl unsubstituted or substituted with at least one of deuterium, a (C6-C18)aryl(s), and a (3- to 30-membered)heteroaryl(s); or —N(R3)(R4). For example, Ar1 may be an unsubstituted phenyl, a phenyl substituted with at least one deuterium, a phenyl substituted with a 26-membered heteroaryl(s), a naphthyl, a biphenyl, a fluorenyl substituted with a methyl(s), a spirobifluorenyl, a terphenyl, a triphenylenyl, a pyridyl unsubstituted and substituted with a phenyl(s), a pyrmidinyl substituted with a phenyl(s), a substituted triazinyl, a substituted quinoxalinyl, a substituted quinazolinyl, a benzoquinoxalinyl substituted with a phenyl(s), a carbazolyl, a dibenzofuranyl, a dibenzothiophenyl, a benzofuropyrimidinyl substituted with a phenyl(s), a benzothienopyrimidinyl substituted with a phenyl(s), an indolopyrimidinyl substituted with a phenyl(s), or —N(R3)(R4). The substituents of the substituted triazinyl, the substituted quinoxalinyl, and the substituted quinazolinyl, each independently, may be at least one selected from the group consisting of a phenyl unsubstituted or substituted with at least one of deuterium and a 26-membered heteroaryl(s), a naphthyl, a biphenyl, a terphenyl, a dibenzofuranyl, a pyridyl substituted with a phenyl(s), a dimethylfluorenyl, and a dibenzothiophenyl.
  • R1 to R4, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent to form a ring(s). According to one embodiment of the present disclosure, R1 to R4, each independently, represent hydrogen, deuterium, a substituted or unsubstituted (C1-C20)alkyl, or a substituted or unsubstituted (C6-C25)aryl. According to another embodiment of the present disclosure, R1 and R2, each independently, represent an unsubstituted (C1-C10)alkyl, and R3 and R4, each independently, represent an unsubstituted (C6-C18)aryl. For example, R1 and R2 may be a methyl, and R3 and R4 may be a phenyl.
  • n represents an integer of 1 or 2, where if n is 2, each of Ar1 may be the same or different
  • Formula 1 may be represented by at least one of the following formulas 1-1 to 1-4.
  • Figure US20220356193A1-20221110-C00003
  • In formulas 1-1 to 1-4, Y1, Y2, Y3, and Y4, each independently, are the same as the definition of Y in formula 1, where if a plurality of Ar1's are present, each of Ar1 may be the same or different; X1 to X12, each independently, represent —N═ or —C(Ra)═; Ra, each independently, represents hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or adjacent Ra's may be linked to each other to form a ring(s), where if a plurality of Ra's are present, each of Ra may be the same or different.
  • According to one embodiment of the present disclosure, Ra represents hydrogen, deuterium, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl; or adjacent Ra's may be linked to each other to form a ring(s). According to another embodiment of the present disclosure, Ra represents hydrogen, an unsubstituted (C6-C18)aryl, or a (5- to 25-membered)heteroaryl substituted with a (C6-C18)aryl(s); or adjacent Ra's may be linked to each other to form a benzene ring(s), an indene ring(s) substituted with a methyl(s), or a benzofuran ring(s) unsubstituted or substituted with a diphenyltriazinyl(s).
  • In any one of formulas 1-1 to 1-4, at least one of Ar1(s) and Ra(s), each independently, may be at least one selected from those listed in the following group 1.
  • Figure US20220356193A1-20221110-C00004
    Figure US20220356193A1-20221110-C00005
  • In group 1, D1 and D2, each independently, represent a benzene ring or a naphthalene ring; X21 represents O, S, NR5, or C(R6)(R7); X22, each independently, represents CR or N, with the proviso that at least one of X22 represents N; X23, each independently, represents CR9 or N; L11 to L18, each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; R11 to R21 and R5 to R9, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl, or may be linked to an adjacent substituent to form a ring(s); and aa, ff, and gg, each independently, represent an integer of 1 to 5, bb represents an integer of 1 to 7, and cc, dd, and ee, each independently, represent an integer of 1 to 4.
  • According to one embodiment of the present disclosure, D1 may be a benzene ring; X21 may be O, S, or C(R6)(R7); L11 to L18, each independently, may be a single bond; R11 to R21 and R5 to R9, each independently, may be hydrogen, deuterium, a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl, or may be linked to an adjacent substituent to form a ring(s); and aa, bb, ff, and gg, each independently, may be an integer of 1 to 5, and cc, dd, and ee, each independently, may be an integer of 1 to 4. For example, R11 may be hydrogen, deuterium, a phenyl, a biphenyl, or a 26-membered heteroaryl; R12 may be hydrogen, or adjacent R12's may be linked to each other to form a benzene ring(s); R13, R18, and R17 may be hydrogen; R18 and R19 may be hydrogen or a phenyl; R21 may be phenyl; R6 and R7 may be a methyl; R8 may be hydrogen, a phenyl, a biphenyl, a dibenzofuranyl, or a dibenzothiophenyl, or adjacent R8's may be linked to each other to form a benzene ring(s); R9 may be hydrogen, an unsubstituted phenyl, a phenyl substituted with at least one deuterium, a phenyl substituted with a 26-membered heteroaryl(s), a naphthyl, a biphenyl, a dimethylfluorenyl, a terphenyl, a pyridyl substituted with a phenyl(s), a dibenzofuranyl, or a dibenzothiophenyl; and aa may be an integer of 1 or 5, bb may be an integer of 1 or 4, and cc may be 1.
  • In any one of formulas 1-1 to 1-4, at least one of Ar1(s) and Ra(s), each independently, may be at least one selected from those listed in the following group 2.
  • Figure US20220356193A1-20221110-C00006
    Figure US20220356193A1-20221110-C00007
    Figure US20220356193A1-20221110-C00008
    Figure US20220356193A1-20221110-C00009
    Figure US20220356193A1-20221110-C00010
    Figure US20220356193A1-20221110-C00011
    Figure US20220356193A1-20221110-C00012
    Figure US20220356193A1-20221110-C00013
    Figure US20220356193A1-20221110-C00014
    Figure US20220356193A1-20221110-C00015
    Figure US20220356193A1-20221110-C00016
    Figure US20220356193A1-20221110-C00017
    Figure US20220356193A1-20221110-C00018
  • In group 2, L represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene; and A1 to A3, each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl. According to one embodiment of the present disclosure, L represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (3- to 25-membered)heteroarylene; and A1 to A3, each independently, represent a substituted or unsubstituted (C1-C20)alkyl, or a substituted or unsubstituted (C6-C25)aryl. A1 and A2 may be the same or different. For example, A1 and A2, each independently, may be a methyl or a phenyl.
  • In any one of formulas 1-1 to 1-4, at least one of Ar1(s) and Ra(s), each independently, may be at least one selected from those listed in the following group 3.
  • Figure US20220356193A1-20221110-C00019
    Figure US20220356193A1-20221110-C00020
    Figure US20220356193A1-20221110-C00021
    Figure US20220356193A1-20221110-C00022
    Figure US20220356193A1-20221110-C00023
    Figure US20220356193A1-20221110-C00024
    Figure US20220356193A1-20221110-C00025
    Figure US20220356193A1-20221110-C00026
    Figure US20220356193A1-20221110-C00027
    Figure US20220356193A1-20221110-C00028
    Figure US20220356193A1-20221110-C00029
    Figure US20220356193A1-20221110-C00030
  • Hereinafter, the compound represented by formula 2 will be described in more detail.
  • According to one embodiment of the present disclosure, formula 2 may be represented by at least one selected from the following formulas 2-1 to 2-8.
  • Figure US20220356193A1-20221110-C00031
    Figure US20220356193A1-20221110-C00032
  • In formulas 2-1 to 2-8, X, Z, HAr, R31 to R36, L2 and a′ to d′ are as defined in formula 2; Z1 to Z5 and Z11 to Z17, each independently, represent N or CR37; and R37, each independently, is the same as the definition of R32 of formula 2.
  • According to one embodiment of the present disclosure, R37, each independently, represents hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl. According to another embodiment of the present disclosure, R37, each independently, represents hydrogen; deuterium; a (C6-C18)aryl unsubstituted or substituted with at least one of a (C1-C10)alkyl(s) and a di(C6-C18)arylamino(s); or a (5- to 20-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s). For example, R37, each independently, may be hydrogen, a phenyl unsubstituted or substituted with a diphenylamino(s), a naphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a dibenzothiophenyl, a dibenzofuranyl, a benzonaphthothiophenyl, a phenylcarbazolyl, or a phenylbenzocarbazolyl.
  • In formula 2, X represents —N═, —NR35—, —O— or —S—, and Z represents —N═, —NR36—, —O— or —S—, where if X represents —N═, Z represents —NR36—, —O— or —S—, and if X represents —NR35—, Z represents —N═, —O— or —S—. According to an embodiment of the present disclosure, X represents —N═, —NR35—, —O— or —S—, and Z represents —N═, —NR36—, —O— or —S—, with the proviso that at least one of X and Z represents —N═.
  • R35 and R36, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3). According to one embodiment of the present disclosure, R35 and R36, each independently, represent a substituted or unsubstituted (C1-C20)alkyl, a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl. According to another embodiment of the present disclosure, R35 and R36, each independently, represent an unsubstituted (C6-C18)aryl. For example, R35 and R36 may be a phenyl.
  • In formula 2, HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to one embodiment of the present disclosure, HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl containing a nitrogen atom(s). According to another embodiment of the present disclosure, HAr represents a substituted or unsubstituted (5- to 25-membered)heteroaryl containing a nitrogen atom(s). According to further embodiment of the present disclosure, HAr represents a (5- to 20-membered)heteroaryl containing a nitrogen atom(s), substituted with a (5- to 25-membered)heteroaryl(s) and/or a (C6-C25)aryl(s). Specifically, HAr may be a substituted or unsubstituted triazinyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted benzoquinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted benzoquinoxalinyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted benzoquinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted benzoisoquinolyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted naphthyridinyl, a substituted or unsubstituted benzothienopyrimidinyl. For example, HAr may be a substituted triazinyl, a substituted pyrimidinyl, a substituted quinoxalinyl, a substituted quinazolinyl, or a substituted naphthyridinyl. The substituents of the substituted triazinyl, the substituted pyrimidinyl, the substituted quinoxalinyl, the substituted quinazolinyl, and the substituted naphthyridinyl may be at least one of a phenyl unsubstituted or substituted with a diphenylamino(s), a naphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a dibenzothiophenyl, a dibenzofuranyl, a benzonaphthothiophenyl, a phenylcarbazolyl, and a phenylbenzocarbazolyl.
  • In formula 2, R31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to one embodiment of the present disclosure, R31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl. According to another embodiment of the present disclosure, R31 represents a (C6-C29)aryl unsubstituted or substituted with at least one of a (C1-C10)alkyl(s) and a (C6-C18)aryl(s); or a (5- to 25-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl(s). For example, R31 may be a phenyl, a naphthyl, a phenylnaphthyl, a biphenyl, a dimethylfluorenyl, a dimethylbenzofluorenyl, a spirobifluorenyl, a spiro[fluoren-benzofluoren]yl, a phenylcarbazolyl, a phenylbenzocarbazolyl, a dibenzofuranyl, or a dibenzothiophenyl.
  • In formula 2, R32 to R34, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3); or may be linked to an adjacent substituent to form a ring(s). For example, R32 to R34 may represent hydrogen.
  • In formula 2, L2 and L3, each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene. According to one embodiment of the present disclosure, L2 and L3, each independently, represent a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (5- to 25-membered)heteroarylene. According to another embodiment of the present disclosure, L2 and L3, each independently, represent a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 20-membered)heteroarylene. For example, L2 and L3, each independently, may be a single bond, a phenylene, or a pyridylene.
  • In formula 2, Ar2 and Ar3, each independently, represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl.
  • In formula 2, a′ represents 1, b′ and c′, each independently, represent an integer of 1 or 2, and d′ represents an integer of 1 to 4, where if each of b′, c′ and d′ is an integer of 2 or more, each of R32 to each of R34 may be the same or different.
  • The compound represented by formula 1 may be at least one selected from the following compounds, but is not limited thereto.
  • Figure US20220356193A1-20221110-C00033
    Figure US20220356193A1-20221110-C00034
    Figure US20220356193A1-20221110-C00035
    Figure US20220356193A1-20221110-C00036
    Figure US20220356193A1-20221110-C00037
    Figure US20220356193A1-20221110-C00038
    Figure US20220356193A1-20221110-C00039
    Figure US20220356193A1-20221110-C00040
    Figure US20220356193A1-20221110-C00041
    Figure US20220356193A1-20221110-C00042
    Figure US20220356193A1-20221110-C00043
    Figure US20220356193A1-20221110-C00044
    Figure US20220356193A1-20221110-C00045
    Figure US20220356193A1-20221110-C00046
    Figure US20220356193A1-20221110-C00047
    Figure US20220356193A1-20221110-C00048
    Figure US20220356193A1-20221110-C00049
    Figure US20220356193A1-20221110-C00050
    Figure US20220356193A1-20221110-C00051
    Figure US20220356193A1-20221110-C00052
    Figure US20220356193A1-20221110-C00053
    Figure US20220356193A1-20221110-C00054
    Figure US20220356193A1-20221110-C00055
    Figure US20220356193A1-20221110-C00056
    Figure US20220356193A1-20221110-C00057
    Figure US20220356193A1-20221110-C00058
    Figure US20220356193A1-20221110-C00059
    Figure US20220356193A1-20221110-C00060
    Figure US20220356193A1-20221110-C00061
    Figure US20220356193A1-20221110-C00062
    Figure US20220356193A1-20221110-C00063
    Figure US20220356193A1-20221110-C00064
    Figure US20220356193A1-20221110-C00065
    Figure US20220356193A1-20221110-C00066
    Figure US20220356193A1-20221110-C00067
    Figure US20220356193A1-20221110-C00068
    Figure US20220356193A1-20221110-C00069
    Figure US20220356193A1-20221110-C00070
    Figure US20220356193A1-20221110-C00071
    Figure US20220356193A1-20221110-C00072
    Figure US20220356193A1-20221110-C00073
    Figure US20220356193A1-20221110-C00074
    Figure US20220356193A1-20221110-C00075
    Figure US20220356193A1-20221110-C00076
    Figure US20220356193A1-20221110-C00077
    Figure US20220356193A1-20221110-C00078
    Figure US20220356193A1-20221110-C00079
    Figure US20220356193A1-20221110-C00080
    Figure US20220356193A1-20221110-C00081
    Figure US20220356193A1-20221110-C00082
    Figure US20220356193A1-20221110-C00083
    Figure US20220356193A1-20221110-C00084
  • Figure US20220356193A1-20221110-C00085
    Figure US20220356193A1-20221110-C00086
    Figure US20220356193A1-20221110-C00087
    Figure US20220356193A1-20221110-C00088
    Figure US20220356193A1-20221110-C00089
    Figure US20220356193A1-20221110-C00090
    Figure US20220356193A1-20221110-C00091
    Figure US20220356193A1-20221110-C00092
    Figure US20220356193A1-20221110-C00093
    Figure US20220356193A1-20221110-C00094
    Figure US20220356193A1-20221110-C00095
    Figure US20220356193A1-20221110-C00096
    Figure US20220356193A1-20221110-C00097
    Figure US20220356193A1-20221110-C00098
    Figure US20220356193A1-20221110-C00099
    Figure US20220356193A1-20221110-C00100
    Figure US20220356193A1-20221110-C00101
    Figure US20220356193A1-20221110-C00102
    Figure US20220356193A1-20221110-C00103
    Figure US20220356193A1-20221110-C00104
    Figure US20220356193A1-20221110-C00105
    Figure US20220356193A1-20221110-C00106
    Figure US20220356193A1-20221110-C00107
    Figure US20220356193A1-20221110-C00108
    Figure US20220356193A1-20221110-C00109
    Figure US20220356193A1-20221110-C00110
    Figure US20220356193A1-20221110-C00111
    Figure US20220356193A1-20221110-C00112
    Figure US20220356193A1-20221110-C00113
    Figure US20220356193A1-20221110-C00114
    Figure US20220356193A1-20221110-C00115
    Figure US20220356193A1-20221110-C00116
    Figure US20220356193A1-20221110-C00117
    Figure US20220356193A1-20221110-C00118
    Figure US20220356193A1-20221110-C00119
    Figure US20220356193A1-20221110-C00120
    Figure US20220356193A1-20221110-C00121
    Figure US20220356193A1-20221110-C00122
    Figure US20220356193A1-20221110-C00123
    Figure US20220356193A1-20221110-C00124
    Figure US20220356193A1-20221110-C00125
    Figure US20220356193A1-20221110-C00126
    Figure US20220356193A1-20221110-C00127
    Figure US20220356193A1-20221110-C00128
    Figure US20220356193A1-20221110-C00129
    Figure US20220356193A1-20221110-C00130
    Figure US20220356193A1-20221110-C00131
    Figure US20220356193A1-20221110-C00132
  • The compound represented by formula 2 may be at least one selected from the following compounds, but is not limited thereto.
  • Figure US20220356193A1-20221110-C00133
    Figure US20220356193A1-20221110-C00134
    Figure US20220356193A1-20221110-C00135
    Figure US20220356193A1-20221110-C00136
    Figure US20220356193A1-20221110-C00137
    Figure US20220356193A1-20221110-C00138
    Figure US20220356193A1-20221110-C00139
    Figure US20220356193A1-20221110-C00140
    Figure US20220356193A1-20221110-C00141
    Figure US20220356193A1-20221110-C00142
    Figure US20220356193A1-20221110-C00143
    Figure US20220356193A1-20221110-C00144
    Figure US20220356193A1-20221110-C00145
    Figure US20220356193A1-20221110-C00146
    Figure US20220356193A1-20221110-C00147
    Figure US20220356193A1-20221110-C00148
    Figure US20220356193A1-20221110-C00149
    Figure US20220356193A1-20221110-C00150
    Figure US20220356193A1-20221110-C00151
    Figure US20220356193A1-20221110-C00152
    Figure US20220356193A1-20221110-C00153
    Figure US20220356193A1-20221110-C00154
    Figure US20220356193A1-20221110-C00155
    Figure US20220356193A1-20221110-C00156
    Figure US20220356193A1-20221110-C00157
    Figure US20220356193A1-20221110-C00158
    Figure US20220356193A1-20221110-C00159
    Figure US20220356193A1-20221110-C00160
    Figure US20220356193A1-20221110-C00161
    Figure US20220356193A1-20221110-C00162
    Figure US20220356193A1-20221110-C00163
    Figure US20220356193A1-20221110-C00164
    Figure US20220356193A1-20221110-C00165
    Figure US20220356193A1-20221110-C00166
    Figure US20220356193A1-20221110-C00167
    Figure US20220356193A1-20221110-C00168
    Figure US20220356193A1-20221110-C00169
    Figure US20220356193A1-20221110-C00170
  • The combination of at least one of compounds C-1 to C-300 and at least one of compounds C2-1 to C2-125 may be used in an organic electroluminescent device.
  • The compound represented by formula 1 of the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, according to the following reaction schemes 1 to 4, but is not limited thereto:
  • Figure US20220356193A1-20221110-C00171
  • Figure US20220356193A1-20221110-C00172
  • Figure US20220356193A1-20221110-C00173
  • Figure US20220356193A1-20221110-C00174
  • In reaction schemes 1 to 4, Y1 to Y4, and X1 to X12 are as defined in formulas 1-1 to 1-4.
  • Although illustrative synthesis examples of the compound represented by formula 1 of the present disclosure are described above, one skilled in the art will be able to readily understand that all of them are based on a Buchwald-Hartwig cross-coupling reaction, an N-arylation reaction, an H-mont-mediated etherification reaction, a Miyaura borylation reaction, a Suzuki cross-coupling reaction, an Intramolecular acid-induced cyclization reaction, a Pd(II)-catalyzed oxidative cyclization reaction, a Grignard reaction, a Heck reaction, a Cyclic Dehydration reaction, an SN1 substitution reaction, an SN2 substitution reaction, a Phosphine-mediated reductive cyclization reaction, etc., and the reactions above proceed even when substituents which are defined in formula 1, but are not specified in the specific synthesis examples, are bonded.
  • The compound represented by formula 2 of the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, according to the methods disclosed in Korean Patent Application Laying-Open No. 2020-0000329 (published on Jan. 2, 2020), etc.
  • In addition, the non-deuterated analogues of the compound represented by formula 2 can be prepared by known coupling and substitution reactions. Also, the non-deuterated analogues may be prepared in a similar manner by using deuterated precursor materials, or more generally may be prepared by treating the non-deuterated compound with a deuterated solvent or D6-benzene in the presence of an H/D exchange catalyst such as a Lewis acid, e.g., aluminum trichloride or ethyl aluminum chloride, a trifluoromethanesulfonic acid, or a trifluoromethanesulfonic acid-D. In addition, the degree of deuteration can be controlled by changing the reaction conditions such as the reaction temperature. For example, the number of deuterium in formula 2 can be controlled by adjusting the reaction temperature and time, the equivalent of the acid, etc.
  • The organic electroluminescent device according to the present disclosure may comprise an anode, a cathode, and at least one organic layer between the anode and cathode in which the organic layer may comprise a plurality of organic electroluminescent materials, including the compound represented by formula 1 as the first organic electroluminescent material, and the compound represented by formula 2 as the second organic electroluminescent material. According to one embodiment of the present disclosure, the organic electroluminescent device according to the present disclosure may comprise an anode, a cathode, and at least one light-emitting layer between the anode and cathode in which the light-emitting layer may comprise the compound represented by formula 1 and the compound represented by formula 2.
  • The light-emitting layer includes a host and a dopant, in which the host includes a plurality of host materials and the compound represented by formula 1 may be included as the first host compound of the plurality of host materials, and the compound represented by formula 2 may be included as the second host compound of the plurality of host materials. The weight ratio of the first host compound and the second host compound is about 1:99 to about 99:1, preferably about 10:90 to about 90:10, more preferably about 30:70 to about 70:30, even more preferably about 40:60 to about 60:40, and most preferably about 50:50.
  • Herein, the light-emitting layer is a layer from which light is emitted, and may be a single layer or a multi-layer of which two or more layers are stacked. All of the first host material and the second host material may be included in one layer, or the first host material and the second host material may be included in respective different light-emitting layers. According to one embodiment of the present disclosure, the doping concentration of the dopant compound with respect to the host compound in the light-emitting layer may be less than 20 wt %.
  • The organic electroluminescent device of the present disclosure may further comprise at least one layer selected from a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron transport layer, an electron injection layer, an interlayer, an electron buffer layer, a hole blocking layer, and an electron blocking layer. According to one embodiment of the present disclosure, the organic electroluminescent device of the present disclosure may further comprise an amine-based compound besides the plurality of host materials of the present disclosure as at least one of a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting material, a light-emitting auxiliary material, and an electron blocking material. Further, according to one embodiment of the present disclosure, the organic electroluminescent device of the present disclosure may further comprise an azine-based compound besides the plurality of host materials of the present disclosure as at least one of an electron transport material, an electron injection material, an electron buffer material, and a hole blocking material.
  • The plurality of host materials according to the present disclosure may be used as light-emitting materials for a white organic light-emitting device. The white organic light-emitting device has been suggested to have various structures such as a parallel arrangement (side-by-side) method, a stacking method, or color conversion material (CCM) method, etc., according to the arrangement of R (red), G (green) or YG (yellowish green), B (blue) light-emitting units. In addition, the plurality of host materials according to one embodiment of the present disclosure may also be used in an organic electroluminescent device comprising a quantum dot (QD).
  • A hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof can be used between the anode and the light-emitting layer. The hole injection layer may be multilayers in order to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, wherein each of the multilayers may use two compounds simultaneously. Further, the hole injection layer may be doped with a p-dopant. The electron blocking layer may be placed between the hole transport layer (or hole injection layer) and the light-emitting layer, and may block overflowing electrons from the light-emitting layer and confine the excitons in the light-emitting layer to prevent light leakage. The hole transport layer or the electron blocking layer may also be multilayers, wherein each of the multilayers may use a plurality of compounds.
  • An electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof can be used between the light-emitting layer and the cathode. The electron buffer layer may be multilayers in order to control the electron injection and improve the interfacial properties between the light-emitting layer and the electron injection layer, wherein each of the multilayers may use two compounds simultaneously. The hole blocking layer or the electron transport layer may also be multilayers, wherein each of the multilayers may use a plurality of compounds. In addition, the electron injection layer may be doped with an n-dopant.
  • The dopant comprised in the organic electroluminescent device of the present disclosure may be at least one phosphorescent or fluorescent dopant, and is preferably phosphorescent dopant. The phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but may be preferably selected from the metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably selected from ortho-metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably ortho-metallated iridium complex compounds.
  • The dopant comprised in the organic electroluminescent device of the present disclosure may comprise a compound represented by the following formula 101, but is not limited thereto.
  • Figure US20220356193A1-20221110-C00175
  • In formula 101, L′ is selected from the following structures 1 to 3:
  • Figure US20220356193A1-20221110-C00176
  • R100 to R103, each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a cyano, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, quinoline, isoquinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline, or indenoquinoline, together with pyridine;
  • R104 to R107, each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a cyano, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to an adjacent substituent to form a ring(s), e.g., a substituted or unsubstituted, naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine, or benzothienopyridine, together with benzene;
  • R201 to R220, each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium and/or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to an adjacent substituent to form a ring(s); and
  • s represents an integer of 1 to 3.
  • The specific examples of the dopant compound are as follows, but are not limited thereto.
  • Figure US20220356193A1-20221110-C00177
    Figure US20220356193A1-20221110-C00178
    Figure US20220356193A1-20221110-C00179
    Figure US20220356193A1-20221110-C00180
    Figure US20220356193A1-20221110-C00181
    Figure US20220356193A1-20221110-C00182
    Figure US20220356193A1-20221110-C00183
    Figure US20220356193A1-20221110-C00184
    Figure US20220356193A1-20221110-C00185
    Figure US20220356193A1-20221110-C00186
    Figure US20220356193A1-20221110-C00187
    Figure US20220356193A1-20221110-C00188
    Figure US20220356193A1-20221110-C00189
    Figure US20220356193A1-20221110-C00190
    Figure US20220356193A1-20221110-C00191
    Figure US20220356193A1-20221110-C00192
    Figure US20220356193A1-20221110-C00193
    Figure US20220356193A1-20221110-C00194
    Figure US20220356193A1-20221110-C00195
    Figure US20220356193A1-20221110-C00196
    Figure US20220356193A1-20221110-C00197
    Figure US20220356193A1-20221110-C00198
    Figure US20220356193A1-20221110-C00199
    Figure US20220356193A1-20221110-C00200
    Figure US20220356193A1-20221110-C00201
    Figure US20220356193A1-20221110-C00202
    Figure US20220356193A1-20221110-C00203
    Figure US20220356193A1-20221110-C00204
    Figure US20220356193A1-20221110-C00205
    Figure US20220356193A1-20221110-C00206
    Figure US20220356193A1-20221110-C00207
    Figure US20220356193A1-20221110-C00208
    Figure US20220356193A1-20221110-C00209
  • In order to form each layer of the organic electroluminescent device of the present disclosure, dry film-forming methods such as vacuum evaporation, sputtering, plasma, ion plating methods, etc., or wet film-forming methods such as ink jet printing, nozzle printing, slot coating, spin coating, dip coating, flow coating methods, etc., can be used.
  • When using a wet film-forming method, a thin film can be formed by dissolving or diffusing materials forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent can be any solvent where the materials forming each layer can be dissolved or diffused, and where there are no problems in film-formation capability.
  • The first and the second host compounds of the present disclosure may be film-formed by the above-listed methods, commonly by a co-evaporation process or a mixture-evaporation process. The co-evaporation is a mixed deposition method in which two or more materials are placed in a respective individual crucible source and a current is applied to both cells at the same time to evaporate the materials. The mixture-evaporation is a mixed deposition method in which two or more materials are mixed in one crucible source before evaporating them, and a current is applied to the cell to evaporate the materials. Further, if the first and the second host compounds are present in the same layer or different layers in an organic electroluminescent device, the two host compounds may individually form films. For example, the second host compound may be deposited after depositing the first host compound.
  • The present disclosure may provide a display device by using the plurality of host materials including the compound represented by formula 1 and the compound represented by formula 2. That is, by using the plurality of host materials of the present disclosure, it is possible to manufacture a display system or a lighting system. Specifically, by using the plurality of host materials of the present disclosure, a display system, for example, for white organic light emitting devices, smart phones, tablets, notebooks, PCs, TVs, or cars; or a lighting system, for example an outdoor or indoor lighting system, can be produced.
  • Hereinafter, the preparation method of the compounds according to the present disclosure and the properties thereof, and the properties of an organic electroluminescent device comprising the plurality of host materials of the present disclosure will be explained in detail with reference to the representative compounds of the present disclosure. However, the present disclosure is not limited by the following examples.
    • Example 1: Preparation of Compound C-1
  • Figure US20220356193A1-20221110-C00210
    Figure US20220356193A1-20221110-C00211
    • Synthesis of Compound 1-1
  • (9-phenyl-9H-carbazol-4-yl)boronic acid (96 g, 334.3 mmol), 2-bromo-1-chloro-3-nitrobenzene (71.8 g, 304 mmol), Pd2(dba)3 (15 g, 16.71 mmol), S-Phos (10.9 g, 26.76 mmol), and K3PO4 (315 g, 1.64 mol) were dissolved in 1500 mL of toluene in a flask, and the mixture was stirred at 130° C. for 4 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and the residual moisture was removed using magnesium sulfate. The residue was dried, and separated by column chromatography to obtain compound 1-1 (67 g, yield: 56.6%).
    • Synthesis of Compound 1-2
  • Compound 1-1 (23.5 g, 58.9 mmol), (2-chlorophenyl)boronic acid (18.4 g, 117.8 mmol), Pd2(dba)3 (2.7 g, 2.95 mmol), S-Phos (2.4 g, 5.89 mmol), and K3PO4 (63 g, 294.5 mmol) were dissolved in 300 mL of toluene in a flask, and the mixture was stirred at 130° C. for 12 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and the residual moisture was removed using magnesium sulfate. The residue was dried, and separated by column chromatography to obtain compound 1-2 (14 g, yield: 50%).
    • Synthesis of Compound 1-3
  • Compound 1-2 (13 g, 27.4 mmol), and triphenylphosphine (21.5 g, 82.1 mmol) were dissolved in 140 mL of o-DCB in a flask, and the mixture was stirred at 220° C. for 7 hours. After completion of the reaction, the reaction mixture was removed by distillation, and separated by column chromatography to obtain compound 1-3 (4 g, yield: 32%).
    • Synthesis of Compound 1-4
  • Compound 1-3 (10 g, 22.5 mmol), Pd(OAc)2 (505 mg, 2.25 mmol), Pcy3-HBF4 (1.63 g, 4.5 mmol), and Cs2CO3 (22 g, 67.5 mmol) were dissolved in 113 mL of o-xylene in a flask, and the mixture was stirred at 160° C. for 4 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and the residual moisture was removed using magnesium sulfate. The residue was dried, and separated by column chromatography to obtain compound 1-4 (1 g, yield: 11%).
    • Synthesis of Compound C-1
  • Compound 1-4 (4.5 g, 11.06 mmol), 2-chloro-3-phenylquinoxaline (4 g, 16.6 mmol), 4-dimethylaminopyridine (DMAP) (67 mg, 0.553 mmol), and Cs2CO3 (10.8 g, 331.8 mmol) were dissolved in 60 mL of dimethylsulfoxide (DMSO) in a flask, and the mixture was refluxed at 140° C. for 4 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and the residual moisture was removed using magnesium sulfate. The residue was dried, and separated by column chromatography to obtain compound C-1 (2.5 g, yield: 37%).
  • Compound MW M.P.
    C-1 610.22 246° C.
    • Example 2: Preparation of Compound C-29
  • Figure US20220356193A1-20221110-C00212
  • Compound 1-4 (4 g, 9.84 mmol), 3-bromo-1,1′:2′,1″-terphenyl (3.65 g, 11.8 mmol), Pd2(dba)3 (448 mg, 0.492 mmol), S-Phos (448 mg, 0.984 mmol), and NaOtBu (2.84 g, 29.52 mmol) were dissolved in 50 mL of o-xylene in a flask, and the mixture was stirred at 170° C. for 4 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and the residual moisture was removed using magnesium sulfate. The residue was dried, and separated by column chromatography to obtain compound C-29 (1.5 g, yield: 24%).
  • Compound MW M.P.
    C-29 643.78 282° C.
    • Example 3: Preparation of Compound C-196
  • Figure US20220356193A1-20221110-C00213
    Figure US20220356193A1-20221110-C00214
    • Synthesis of Compound 3-1
  • Compound A (60 g, 283 mmol), Compound B (100 g, 424 mmol), tetrakis(triphenylphosphine)palladium (16.3 g, 14.1 mmol), cesium carbonate (276 g, 849 mmol), 1400 mL of toluene, 350 mL of ethanol and 350 mL of distilled water were added into a reaction vessel, and the mixture was stirred at 130° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. The extracted organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporator. Then, the residue was separated by column chromatography to obtain compound 3-1 (38 g, yield: 41%).
    • Synthesis of Compound 3-2
  • Compound 3-1 (38 g, 117 mmol), phenylboronic acid (35 g, 234 mmol), tris(dibenzylindeneacetone)dipalladium (5.3 g, 5.86 mmol). S-Phos (4.8 g, 11.7 mmol), tripotassium phosphate (62 g, 293 mmol), and 600 mL of toluene were added into a reaction vessel, and the mixture was stirred under reflux for 2 hours. After completion of the reaction, the reaction mixture was washed with distilled water, and extracted with ethyl acetate. The extracted organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporator. Then, the residue was separated by column chromatography to obtain compound 3-2 (31 g, yield: 67%).
    • Synthesis of Compound 3-3
  • Compound 3-2 (21 g, 53.7 mmol), triphenylphosphite (70 mL, 268 mmol), and 180 mL of dichlorobenzene (DCB) were added into a reaction vessel, and the mixture was stirred at 200° C. for 12 hours. After completion of the reaction, the reaction mixture was distilled under reduced pressure to remove DCB, and washed with distilled water and extracted with ethyl acetate. The extracted organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporator. Then, the residue was separated by column chromatography to obtain compound 3-3 (10 g, yield: 55%).
    • Synthesis of Compound 3-4
  • Compound 3-3 (6.6 g, 17.9 mmol), palladium (II) acetate (0.2 g, 0.89 mmol), PCy3-BF4 (1.3 g, 3.58 mmol), cesium carbonate (17 g, 53.7 mmol), and 90 mL of o-xylene were added into a reaction vessel, and the mixture was stirred under reflux at 160° C. for 4 hours. After completion of the reaction, the reaction mixture was washed with distilled water, and extracted with ethyl acetate. The extracted organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporator. Then, the residue was separated by column chromatography to obtain compound 3-4 (1.8 g, yield: 32%).
    • Synthesis of Compound C-196
  • Compound 3-4 (1.8 g, 5.43 mmol), 2-(3-bromophenyl)-4,6-diphenyl-1,3,5-triazine (2.3 g, 5.97 mmol), tris(dibenzylindeneacetone)dipalladium (0.2 g, 0.27 mmol), tri-tert-butylphosphine (0.3 mL, 0.54 mmol), sodium tert-butoxide (1.3 g, 13.5 mmol), and 30 mL of toluene were added into a reaction vessel, and the mixture was stirred under reflux for 3 hours. After completion of the reaction, the reaction mixture was washed with distilled water, and extracted with ethyl acetate. The extracted organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporator. Then, the residue was separated by column chromatography to obtain compound C-196 (3.3 g, yield: 95%).
  • Compound MW UV PL M.P.
    C-196 638.21 410 nm 522 nm 240° C.
    • Example 4: Preparation of Compound C-36
  • Figure US20220356193A1-20221110-C00215
  • Compound 1-4 (4.0 g, 9.84 mmol), 4-bromo-N,N-diphenylaniline (3.2 g, 9.84 mmol), Pd2(dba)3 (0.45 g, 0.5 mmol), s-phos (0.4 g, 0.98 mmol), and NaOtBu (1.9 g, 19.7 mmol) were dissolved in 50 mL of o-xylene in a flask, and the mixture was stirred under reflux for 5 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and separated by column chromatography to obtain compound C-36 (2.67 g, yield: 42%).
  • Compound MW M.P.
    C-36 649.78 312° C.
    • Example 5: Preparation of Compound C-32
  • Figure US20220356193A1-20221110-C00216
  • Compound 1-4 (4.0 g, 9.84 mmol), 2-bromodibenzo[b,d]furan (1.7 g, 9.84 mmol), Pd2(dba)3 (0.45 g, 0.5 mmol), s-phos (0.4 g, 0.98 mmol), and NaOtBu (1.9 g, 19.7 mmol) were dissolved in 50 mL of o-xylene in a flask, and the mixture was stirred under reflux for 5 hours. After completion of the reaction, an organic layer was extracted with ethyl acetate, and separated by column chromatography to obtain compound C-32 (1.68 g, yield: 30%).
  • Compound MW M.P.
    C-32 572.65 291° C.
    • Example 6: Preparation of Compound C2-86
  • Figure US20220356193A1-20221110-C00217
  • Compound A (CAS: 2085325-18-2, 4.0 g, 9.5 mmol), 2-chloro-3-phenylquinoxaline (2.8 g, 11.4 mmol), tetrakis(triphenylphosphine)palladium (Pd(PPh3)4) (0.5 g, 0.5 mmol), potassium carbonate (K2CO3) (2.0 g, 19 mmol), 30 mL of toluene, 7 mL of EtOH, and 10 mL of water were added into a reaction vessel, and the mixture was stirred under reflux for one day. After completion of the reaction, the reaction mixture was cooled to room temperature, filtered by cellite with methylene chloride (MC), distilled under reduced pressure, and then separated by column chromatography with methylene chloride/hexane (MC/Hex) to obtain compound C2-86 (2.7 g, yield: 57%).
  • Compound MW M.P.
    C2-86 499.6 266° C.
    • Example 7: Preparation of Compound C2-125
  • Figure US20220356193A1-20221110-C00218
  • Compound A (23.8 g, 56.6 mmol), 2-chloro-4-(naphthalen-1-yl)-6-phenyl-1,3,5-triazine (15.0 g, 47.2 mmol), Pd(PPh3)4 (2.72 g, 2.36 mmol), K2CO3 (16.3 g, 118 mmol), 240 mL of toluene, 60 mL of EtOH, and 60 mL of distilled water were added into a reaction vessel, and the mixture was stirred under reflux for 2 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and filtered by silica gel. Then, an organic layer was distilled under reduced pressure, and recrystallized with toluene to obtain compound C2-125 (13.8 g, yield: 51%).
  • Compound MW M.P.
    C2-125 576.6 231° C.
    • Example 8: Preparation of Compound C2-116
  • Figure US20220356193A1-20221110-C00219
  • Compound A (4.0 g, 9.5 mmol), 2-([1,1′-biphenyl]-3-yl)-4-chloro-6-phenyl-1,3,5-triazine (3.9 g, 11.4 mmol), Pd(PPh3)4 (0.5 g, 0.5 mmol), K2CO3 (2.6 g, 19 mmol), 30 mL of toluene, 7 mL of EtOH, and 10 mL of distilled water were added into a reaction vessel, and the mixture was stirred under reflux for 6 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and stirred at room temperature. The solid obtained by adding MeOH was filtered under reduced pressure, and separated by column chromatography with MC to obtain compound C2-116 (4.6 yield: 80%).
  • Compound MW M.P.
    C2-116 602.7 227° C.
    • Example 9: Preparation of Compound C2-120
  • Figure US20220356193A1-20221110-C00220
  • Compound A (3.0 g, 7.1 mmol), 2-chloro-4-(dibenzo[b,d]furan-1-yl)-6-phenyl-1,3,5-triazine (3.4 g, 9.26 mmol), Pd(PPh3)4 (0.4 g, 0.36 mmol), K2CO3 (2.0 g, 14 mmol). 36 mL of toluene, 8 mL of EtOH, and 12 mL of distilled water were added into a reaction vessel, and the mixture was stirred under reflux for 6 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and stirred at room temperature. The solid obtained by adding MeOH was filtered under reduced pressure, and separated by column chromatography with MC to obtain compound C2-120 (3.3 g, yield: 75%).
  • Compound MW M.P.
    C2-120 616.7 282° C.
    • Device Examples 1 to 3: Producing an OLED According to the Present Disclosure
  • OLEDs according to the present disclosure were produced. A transparent electrode indium tin oxide (ITO) thin film (10 Ω/sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to an ultrasonic washing with acetone and isopropyl alcohol, sequentially, and then was stored in isopropyl alcohol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 shown in Table 2 as a first hole injection compound was introduced into a cell of the vacuum vapor deposition apparatus, and compound HT-1 shown in Table 2 was introduced into another cell of the vacuum vapor deposition apparatus. The two materials were evaporated at different rates, and compound HI-1 was deposited in a doping amount of 3 wt % based on the total amount of compound HI-1 and compound HT-1 to form a hole injection layer having a thickness of 10 nm on the ITO substrate. Next, compound HT-1 was deposited on the hole injection layer to form a first hole transport layer having a thickness of 80 nm. Compound HT-2 was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer. After forming the hole injection layer and the hole transport layers, a light-emitting layer was formed thereon as follows: The first host compound and the second host compound shown in Table 1 below were introduced into two cells of the vacuum vapor depositing apparatus as hosts, and compound D-71 was introduced into another cell as a dopant. The two host materials were evaporated at a rate of 1:1 and the dopant material was simultaneously evaporated at a different rate, and the dopant was deposited in a doping amount of 3 wt % based on the total amount of the hosts and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer. Compound ETL-1 and compound EIL-1 were evaporated in a weight ratio of 50:50 to form an electron transport layer having a thickness of 35 nm on the light-emitting layer. After depositing compound EIL-1 as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thus, an OLED was produced. All the materials used for producing the OLED were purified by vacuum sublimation at 10−8 torr.
    • Comparative Examples 1 to 3: Producing an OLED Comprising a Comparative Compound as a Host
  • OLEDs were produced in the same manner as in Device Example 1, except that the compound shown in Table 1 below was used alone as a first host or a second host.
  • The driving voltage, luminous efficiency, and light-emitting color at a luminance of 1,000 nit, and the time taken for luminance to decrease from 100% to 95% at a luminance of 5,000 nit (lifetime; T95) of the OLEDs produced in Device Examples 1 to 3, and Comparative Examples 1 to 3 are provided in Table 1 below.
  • TABLE 1
    Life-
    Driving Luminous Light- time
    Fist Second Voltage Efficiency Emitting (T95,
    Host Host (V) (cd/A) Color hr)
    Comparative C-29 — 4.7 5.8 Red 9.3
    Example 1
    Comparative — C2-120 3.5 30.8 Red 55
    Example 2
    Comparative — C2-116 3.2 28.0 Red 33.9
    Example 3
    Device C-29 C2-120 3.0 35.3 Red 551
    Example 1
    Device C-32 C2-120 3.1 35.4 Red 563
    Example 2
    Device C-32 C2-116 3.0 35.1 Red 322
    Example 3
  • From Table 1 above, it can be confirmed that the OLEDs comprising the plurality of host materials according to the present disclosure as host materials have improved driving voltage, luminous efficiency, and/or lifespan property, compared to the conventional OLED. Without wishing to be bound by theory, it is considered that by using the compound represented by formula 1 of the present disclosure in combination with the compound represented by formula 2 of the present disclosure, the HOMO (highest occupied molecular orbital) energy level increases compared to the case when using the conventional compound, which is a carbazole derivative, resulting in increase of the hole mobility. Thus, the hole injection from a hole transport layer becomes easier, and the balance between hole and electron and the formation of exciton may be improved, thereby improving the driving voltage, luminous efficiency and/or lifetime property of an OLED.
  • The compounds used in the Device Examples and the Comparative Examples are shown in Table 2 below.
  • TABLE 2
    Hole Injection Layer/ Hole Transport Layer
    Figure US20220356193A1-20221110-C00221
    Figure US20220356193A1-20221110-C00222
    Figure US20220356193A1-20221110-C00223
    Light-Emitting Layer
    Figure US20220356193A1-20221110-C00224
    Figure US20220356193A1-20221110-C00225
    Figure US20220356193A1-20221110-C00226
    Figure US20220356193A1-20221110-C00227
    Figure US20220356193A1-20221110-C00228
    Electron Transport Layer/ Electron Injection Layer
    Figure US20220356193A1-20221110-C00229
    Figure US20220356193A1-20221110-C00230

Claims (11)

1. A plurality of host materials comprising at least one first host compound and at least second host compound, wherein the first host compound is represented by the following formula 1, and the second host compound is represented by the following formula 2:
Figure US20220356193A1-20221110-C00231
wherein
B1 to B7, each independently, are not present, or represent a substituted or unsubstituted (C5-C20) ring, in which carbon atoms of the ring may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, with the proviso that at least five of B1 to B7 are present, and adjacent rings of B1 to B7 are fused with each other;
Y represents —N(L1-(Ar1)n)—, —O—, —S—, or —C(R1)(R2)—;
L1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
Ar1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —N(R3)(R4);
R1 to R4, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent to form a ring(s); and
n represents an integer of 1 or 2, where if n is 2, each of Ar1 may be the same or different;
Figure US20220356193A1-20221110-C00232
wherein
X represents —N═, —NR35—, —O— or —S—;
Z represents —N═, —NR36—, —O— or —S—, where if X represents —N═, Z represents —NR36—, —O— or —S—, and if X represents —NR35—, Z represents —N═, —O— or —S—;
HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl;
R31 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
R32 to R34, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3); or may be linked to an adjacent substituent to form a ring(s);
R35 and R36, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or -L3-N(Ar2)(Ar3);
L2 and L3, each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
Ar2 and Ar3, each independently, represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring(s) and a (C6-C30) aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and
a′ represents 1, b′ and c′, each independently, represent an integer of 1 or 2, and d′ represents an integer of 1 to 4, where if each of b′, c′ and d′ is an integer of 2 or more, each of R32 to each of R34 may be the same or different.
2. The plurality of host materials according to claim 1, wherein the substituents of the substituted alkyl, the substituted alkylene, the substituted alkenyl, the substituted aryl, the substituted arylene, the substituted heteroaryl, the substituted heteroarylene, the substituted cycloalkyl, the substituted cycloalkylene, the substituted alkoxy, the substituted trialkylsilyl, the substituted dialkylarylsilyl, the substituted alkyldiarylsilyl, the substituted triarylsilyl, the substituted fused ring of an aliphatic ring(s) and an aromatic ring(s), and the substituted ring, each independently, are at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; a (C1-C30)alkyl; a halo(C1-C30)alkyl; a (C2-C30)alkenyl; a (C2-C30)alkynyl; a (C1-C30)alkoxy; a (C1-C30)alkylthio; a (C3-C30)cycloalkyl; a (C3-C30)cycloalkenyl; a (3- to 7-membered)heterocycloalkyl; a (C6-C30)aryloxy; a (C6-C30)arylthio; a (3- to 50-membered)heteroaryl unsubstituted or substituted with at least one of a (C1-C30)alkyl(s), a (C6-C30)aryl(s), and a di(C6-C30)arylamino(s); a (C6-C30)aryl unsubstituted or substituted with at least one of deuterium, a cyano(s), a (C1-C30)alkyl(s), a (3- to 50-membered)heteroaryl(s), a mono- or di-(C6-C30)arylamino(s), and a tri(C6-C30)arylsilyl(s); a tri(C1-C30)alkylsilyl; a tri(C6-C30)arylsilyl; a di(C1-C30)alkyl(C6-C30)arylsilyl; a (C1-C30)alkyldi(C6-C30)arylsilyl; an amino; a mono- or di-(C1-C30)alkylamino; a mono- or di-(C2-C30)alkenylamino; a mono- or di-(C6-C30)arylamino; a mono- or di-(3- to 30-membered)heteroarylamino; a (C1-C30)alkyl(C2-C30)alkenylamino; a (C1-C30)alkyl(C6-C30)arylamino; a (C1-C30)alkyl(3- to 30-membered)heteroarylamino; a (C2-C30)alkenyl(C6-C30)arylamino; a (C2-C30)alkenyl(3- to 30-membered)heteroarylamino; a (C6-C30)aryl(3- to 30-membered)heteroarylamino; a (C1-C30)alkylcarbonyl; a (C1-C30)alkoxycarbonyl; a (C6-C30)arylcarbonyl; a di(C6-C30)arylboronyl; a di(C1-C30)alkylboronyl; a (C1-C30)alkyl(C6-C30)arylboronyl; a (C6-C30)aryl(C1-C30)alkyl; and a (C1-C30)alkyl(C6-C30)aryl.
3. The plurality of host materials according to claim 1, wherein formula 1 is represented by at least one of the following formulas 1-1 to 1-4:
Figure US20220356193A1-20221110-C00233
wherein
Y1, Y2, Y3, and Y4, each independently, are the same as the definition of Y in claim 1, where if a plurality of Ar1's are present, each of Ar1 may be the same or different;
X1 to X12, each independently, represent —N═ or —C(Ra)═; and
Ra, each independently, represents hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or adjacent Ra's may be linked to each other to form a ring(s), where if a plurality of Ra's are present, each of Ra may be the same or different.
4. The plurality of host materials according to claim 3, wherein at least one of Ar1(s) and Ra(s), each independently, is at least one selected from those listed in the following group 1:
Figure US20220356193A1-20221110-C00234
Figure US20220356193A1-20221110-C00235
wherein
D1 and D2, each independently, represent a benzene ring or a naphthalene ring;
X21 represents O, S, NR5, or C(R6)(R7);
X22, each independently, represents CR8 or N, with the proviso that at least one of X22 represents N;
X23, each independently, represents CR9 or N;
L11 to L18, each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
R11 to R21 and R5 to R9, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl, or may be linked to an adjacent substituent to form a ring(s); and
aa, ff, and gg, each independently, represent an integer of 1 to 5, bb represents an integer of 1 to 7, and cc, dd, and ee, each independently, represent an integer of 1 to 4, where if each of aa to gg is an integer of 2 or more, each of R11 to each of R17 may be the same or different.
5. The plurality of host materials according to claim 3, wherein at least one of Ar1(s) and Ra(s), each independently, is at least one selected from those listed in the following groups 2 and 3:
Figure US20220356193A1-20221110-C00236
Figure US20220356193A1-20221110-C00237
Figure US20220356193A1-20221110-C00238
Figure US20220356193A1-20221110-C00239
Figure US20220356193A1-20221110-C00240
Figure US20220356193A1-20221110-C00241
Figure US20220356193A1-20221110-C00242
Figure US20220356193A1-20221110-C00243
Figure US20220356193A1-20221110-C00244
Figure US20220356193A1-20221110-C00245
Figure US20220356193A1-20221110-C00246
Figure US20220356193A1-20221110-C00247
Figure US20220356193A1-20221110-C00248
Figure US20220356193A1-20221110-C00249
Figure US20220356193A1-20221110-C00250
Figure US20220356193A1-20221110-C00251
Figure US20220356193A1-20221110-C00252
Figure US20220356193A1-20221110-C00253
Figure US20220356193A1-20221110-C00254
Figure US20220356193A1-20221110-C00255
Figure US20220356193A1-20221110-C00256
Figure US20220356193A1-20221110-C00257
Figure US20220356193A1-20221110-C00258
Figure US20220356193A1-20221110-C00259
Figure US20220356193A1-20221110-C00260
Figure US20220356193A1-20221110-C00261
Figure US20220356193A1-20221110-C00262
Figure US20220356193A1-20221110-C00263
Figure US20220356193A1-20221110-C00264
Figure US20220356193A1-20221110-C00265
in group 2,
L represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene; and
A1 to A3, each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl.
6. The plurality of host materials according to claim 1, wherein in formula 1, B1 to B7, each independently, are not present, or represent a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted pyrrole ring, a substituted or unsubstituted furan ring, a substituted or unsubstituted thiophene ring, a substituted or unsubstituted cyclopentadiene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted pyridine ring, or a substituted or unsubstituted dibenzofuran ring, with the proviso that at least five of B1 to B7 are present, and adjacent rings of B1 to B7 are fused with each other.
7. The plurality of host materials according to claim 1, wherein formula 2 is represented by at least one selected from the following formulas 2-1 to 2-8:
Figure US20220356193A1-20221110-C00266
Figure US20220356193A1-20221110-C00267
wherein
X, Z, HAr, R31 to R38, L2 and a′ to d′ are as defined in claim 1;
Z1 to Z5 and Z11 to Z17, each independently, represent N or CR37; and
R37, each independently, is the same as the definition of R32.
8. The plurality of host materials according to claim 1, wherein in formula 2, HAr represents a substituted or unsubstituted triazinyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted benzoquinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted benzoquinoxalinyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted benzoquinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted benzoisoquinolyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted naphthyridinyl, a substituted or unsubstituted triazanaphthyl, or a substituted or unsubstituted benzothienopyrimidinyl.
9. The plurality of host materials according to claim 1, wherein the compound represented by formula 1 is at least one selected from the following compounds:
Figure US20220356193A1-20221110-C00268
Figure US20220356193A1-20221110-C00269
Figure US20220356193A1-20221110-C00270
Figure US20220356193A1-20221110-C00271
Figure US20220356193A1-20221110-C00272
Figure US20220356193A1-20221110-C00273
Figure US20220356193A1-20221110-C00274
Figure US20220356193A1-20221110-C00275
Figure US20220356193A1-20221110-C00276
Figure US20220356193A1-20221110-C00277
Figure US20220356193A1-20221110-C00278
Figure US20220356193A1-20221110-C00279
Figure US20220356193A1-20221110-C00280
Figure US20220356193A1-20221110-C00281
Figure US20220356193A1-20221110-C00282
Figure US20220356193A1-20221110-C00283
Figure US20220356193A1-20221110-C00284
Figure US20220356193A1-20221110-C00285
Figure US20220356193A1-20221110-C00286
Figure US20220356193A1-20221110-C00287
Figure US20220356193A1-20221110-C00288
Figure US20220356193A1-20221110-C00289
Figure US20220356193A1-20221110-C00290
Figure US20220356193A1-20221110-C00291
Figure US20220356193A1-20221110-C00292
Figure US20220356193A1-20221110-C00293
Figure US20220356193A1-20221110-C00294
Figure US20220356193A1-20221110-C00295
Figure US20220356193A1-20221110-C00296
Figure US20220356193A1-20221110-C00297
Figure US20220356193A1-20221110-C00298
Figure US20220356193A1-20221110-C00299
Figure US20220356193A1-20221110-C00300
Figure US20220356193A1-20221110-C00301
Figure US20220356193A1-20221110-C00302
Figure US20220356193A1-20221110-C00303
Figure US20220356193A1-20221110-C00304
Figure US20220356193A1-20221110-C00305
Figure US20220356193A1-20221110-C00306
Figure US20220356193A1-20221110-C00307
Figure US20220356193A1-20221110-C00308
Figure US20220356193A1-20221110-C00309
Figure US20220356193A1-20221110-C00310
Figure US20220356193A1-20221110-C00311
Figure US20220356193A1-20221110-C00312
Figure US20220356193A1-20221110-C00313
Figure US20220356193A1-20221110-C00314
Figure US20220356193A1-20221110-C00315
Figure US20220356193A1-20221110-C00316
Figure US20220356193A1-20221110-C00317
Figure US20220356193A1-20221110-C00318
Figure US20220356193A1-20221110-C00319
Figure US20220356193A1-20221110-C00320
Figure US20220356193A1-20221110-C00321
Figure US20220356193A1-20221110-C00322
Figure US20220356193A1-20221110-C00323
Figure US20220356193A1-20221110-C00324
Figure US20220356193A1-20221110-C00325
Figure US20220356193A1-20221110-C00326
Figure US20220356193A1-20221110-C00327
Figure US20220356193A1-20221110-C00328
Figure US20220356193A1-20221110-C00329
Figure US20220356193A1-20221110-C00330
Figure US20220356193A1-20221110-C00331
Figure US20220356193A1-20221110-C00332
Figure US20220356193A1-20221110-C00333
Figure US20220356193A1-20221110-C00334
Figure US20220356193A1-20221110-C00335
Figure US20220356193A1-20221110-C00336
Figure US20220356193A1-20221110-C00337
Figure US20220356193A1-20221110-C00338
Figure US20220356193A1-20221110-C00339
Figure US20220356193A1-20221110-C00340
Figure US20220356193A1-20221110-C00341
Figure US20220356193A1-20221110-C00342
Figure US20220356193A1-20221110-C00343
Figure US20220356193A1-20221110-C00344
Figure US20220356193A1-20221110-C00345
Figure US20220356193A1-20221110-C00346
Figure US20220356193A1-20221110-C00347
Figure US20220356193A1-20221110-C00348
10. The plurality of host materials according to claim 1, wherein the compound represented by formula 2 is at least one selected from the following compounds:
Figure US20220356193A1-20221110-C00349
Figure US20220356193A1-20221110-C00350
Figure US20220356193A1-20221110-C00351
Figure US20220356193A1-20221110-C00352
Figure US20220356193A1-20221110-C00353
Figure US20220356193A1-20221110-C00354
Figure US20220356193A1-20221110-C00355
Figure US20220356193A1-20221110-C00356
Figure US20220356193A1-20221110-C00357
Figure US20220356193A1-20221110-C00358
Figure US20220356193A1-20221110-C00359
Figure US20220356193A1-20221110-C00360
Figure US20220356193A1-20221110-C00361
Figure US20220356193A1-20221110-C00362
Figure US20220356193A1-20221110-C00363
Figure US20220356193A1-20221110-C00364
Figure US20220356193A1-20221110-C00365
Figure US20220356193A1-20221110-C00366
Figure US20220356193A1-20221110-C00367
Figure US20220356193A1-20221110-C00368
Figure US20220356193A1-20221110-C00369
Figure US20220356193A1-20221110-C00370
Figure US20220356193A1-20221110-C00371
Figure US20220356193A1-20221110-C00372
Figure US20220356193A1-20221110-C00373
Figure US20220356193A1-20221110-C00374
Figure US20220356193A1-20221110-C00375
Figure US20220356193A1-20221110-C00376
Figure US20220356193A1-20221110-C00377
Figure US20220356193A1-20221110-C00378
Figure US20220356193A1-20221110-C00379
Figure US20220356193A1-20221110-C00380
Figure US20220356193A1-20221110-C00381
Figure US20220356193A1-20221110-C00382
Figure US20220356193A1-20221110-C00383
Figure US20220356193A1-20221110-C00384
11. An organic electroluminescent device comprising an anode, a cathode, and at least one light-emitting layer between the anode and the cathode, wherein at least one of the light-emitting layers comprises the plurality of host materials according to claim 1.
US17/214,253 2020-03-26 2021-03-26 Plurality of host materials and organic electroluminescent device comprising the same Abandoned US20220356193A1 (en)

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