Multiple host materials and organic electroluminescent device comprising same

Abstract

The present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same. By comprising a specific combination of the compounds according to the present disclosure as a plurality of host materials, an organic electroluminescent device having improved luminous efficiency and / or lifespan characteristics compared to conventional organic electroluminescent devices can be provided.

Description

Technical Field

[0001] The present disclosure relates to a variety of host materials and organic electroluminescent devices comprising the same. Background Art

[0002] In 1987, Tang et al. of Eastman Kodak first developed a small molecule green organic electroluminescent device (OLED) by using a TPD / Alq3 double layer consisting of a light-emitting layer and a charge transport layer. Since then, the development of OLED has been carried out rapidly, and OLED has been commercialized. At present, OLED mainly uses phosphorescent materials with excellent luminous efficiency in panel realization. However, in many applications such as TV and lighting equipment, the life of OLED is insufficient, and more efficient OLED is still needed. Typically, as the brightness of OLED increases, the life of OLED becomes shorter. Therefore, for long-term use and high display resolution, it is necessary to have an OLED with high luminous efficiency and / or long life.

[0003] In order to enhance luminous efficiency, driving voltage and / or lifespan, various materials or concepts for organic layers of OLEDs have been proposed. However, these are not satisfactory in practical applications. In addition, it has been necessary to develop organic electroluminescent materials with more improved performance (e.g., improved driving voltage, luminous efficiency, power efficiency and / or lifespan characteristics) compared to the combination of previously disclosed specific compounds.

[0004] Meanwhile, Korean Patent Application Publication No. 2020-0014189 discloses a compound having a condensed structure comprising benzocarbazole and azulene and a compound having a condensed structure comprising indolecarbazole and azapine as a host material. However, the aforementioned reference does not specifically disclose a plurality of host materials comprising a specific combination of compounds according to the present disclosure. Summary of the invention

[0005] Technical issues

[0006] The object of the present disclosure is, firstly, to provide a variety of host materials capable of providing an organic electroluminescent device with low driving voltage, and / or high luminous efficiency and / or excellent life characteristics, and secondly, to provide an organic electroluminescent device including these host materials.

[0007] Solution to the problem

[0008] As a result of in-depth research to solve the technical problem, the inventors of the present invention found that the above-mentioned purpose can be achieved by a plurality of main materials, wherein the plurality of main materials include a first main material and a second main material, the first main material includes a compound represented by the following formula 1, and the second main material includes a compound represented by the following formula 2.

[0009]

[0010] In formula 1,

[0011] L1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group;

[0012] Ar1 represents hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C3-C30) cycloalkenyl, substituted or unsubstituted (3- to 7-membered) heterocycloalkyl, -N-(L2-Ar2)(L3-Ar3), substituted or unsubstituted (C6-C30) aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl;

[0013] L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group;

[0014] Ar2 and Ar3 each independently represent a substituted or unsubstituted (C1-C30)alkyl group, a substituted or unsubstituted (C3-C30)cycloalkyl group, a substituted or unsubstituted (C3-C30)cycloalkenyl group, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl group, a substituted or unsubstituted (C6-C30)aryl group, or a substituted or unsubstituted (3- to 30-membered)heteroaryl group;

[0015] It is represented by the following formula 1-1 or 1-2;

[0016]

[0017] In formulas 1-1 and 1-2,

[0018] X1 to X 25 Each independently represents N or CR a ;

[0019] R aEach independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be connected to one or more adjacent substituents to form one or more rings;

[0020] * indicates the site of attachment to L1;

[0021]

[0022] In formula 2,

[0023] X represents O or S;

[0024] L4 and L5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group;

[0025] Ar4 and Ar5 each independently represent a substituted or unsubstituted (C6-C30)aryl group, or a substituted or unsubstituted (3- to 30-membered) heteroaryl group;

[0026] R1 and R2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, or -SiR 11 R 12 R 13 ;

[0027] a represents an integer of 1 to 4, b represents an integer of 1 to 3, and if a and b each represent an integer of 2 or more, each R1 and each R2 may be the same as or different from each other.

[0028] Beneficial effects of the present invention

[0029] Organic electroluminescent devices having low driving voltage, high luminous efficiency, and / or excellent lifespan characteristics may be produced by using the various host materials disclosed herein. DETAILED DESCRIPTION

[0030] Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the present disclosure and is not intended to limit the scope of the present disclosure in any way.

[0031] The term "organic electroluminescent compound" in the present disclosure means a compound that can be used in an organic electroluminescent device and, if necessary, can be contained in any layer constituting the organic electroluminescent device.

[0032] The term "organic electroluminescent material" in the present disclosure means a material that can be used in an organic electroluminescent device and can contain at least one compound. If necessary, the organic electroluminescent material can be contained in any layer constituting the organic electroluminescent device. For example, the organic electroluminescent material can be a hole injection material, a hole transport material, a hole auxiliary material, a luminescence auxiliary material, an electron blocking material, a luminescent 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.

[0033] The term "multiple host materials" in the present disclosure means a host material comprising a combination of at least two compounds, which may be included in any light-emitting layer constituting an organic electroluminescent device. It may mean both a material before being included in an organic electroluminescent device (e.g., before vapor deposition) and a material after being included in an organic electroluminescent device (e.g., after vapor deposition). For example, the multiple host materials of the present disclosure are a combination of at least two host materials, and may selectively further include conventional materials included in organic electroluminescent materials. At least two compounds included in the multiple host materials of the present disclosure may be included in one light-emitting layer together, or may be included in different light-emitting layers respectively. For example, at least two host materials may be mixed evaporated or co-evaporated, or may be evaporated individually.

[0034] Herein, the term "(C1-C30) alkyl" means a straight or branched alkyl group having 1 to 30 carbon atoms constituting the chain, wherein the number of carbon atoms is preferably 1 to 10, and more preferably 1 to 6. The above-mentioned alkyl group may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl and the like.

[0035] Herein, the term "(C3-C30) cycloalkyl" means a monocyclic hydrocarbon or a polycyclic hydrocarbon having 3 to 30 ring skeleton carbon atoms, wherein the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7. The above-mentioned cycloalkyl may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclohexylmethyl and the like.

[0036] The term "(3-membered to 7-membered) heterocycloalkyl" means a cycloalkyl group having 3 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 O, S and N. The above-mentioned heterocycloalkyl group may include tetrahydrofuran, pyrrolidine, tetrahydrothiophene (thiolan), tetrahydropyran and the like.

[0037] The terms "(C6-C30)aryl" and "(C6-C30)arylene" mean a monocyclic or condensed ring group derived from an aromatic hydrocarbon having 6 to 30 ring skeleton carbon atoms. The above-mentioned aryl and arylene groups may be partially saturated. The above-mentioned aryl groups may include spiro structures. The above-mentioned aryl groups may include phenyl, biphenyl, terphenyl, pentphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, diphenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, triphenylenyl, anthracenyl, indenyl, triphenylene, pyrenyl, naphthyl, perylene, The aryl groups include phenyl, 1-naphthyl, 2-naphthyl, 1-anthracenyl, 2-anthracenyl, 9-anthracenyl, benzanthracenyl, 1-phenanthrenyl, 2-phenanthrenyl, 3-phenanthrenyl, 4-phenanthrenyl, 9-phenanthrenyl, naphthacetyl, pyrenyl, 1- Base, 2- Base, 3- Base, 4- Base, 5- Base, 6- Benzo[c]phenanthrenyl, benzo[g] 1-triphenylene, 2-triphenylene, 3-triphenylene, 4-triphenylene, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, benzo[a]fluorenyl, benzo[b]fluorenyl, benzo[c]fluorenyl, dibenzofluorenyl, 2-biphenyl, 3-biphenyl, 4-biphenyl, 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 phenyl, 4'-methylbiphenyl, 4"-tert-butyl-4-p-terphenyl-4-yl, 9,9-dimethyl-1-fluorenyl, 9,9-dimethyl-2-fluorenyl, 9,9-dimethyl-3-fluorenyl, 9,9-dimethyl-4 ... 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-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 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 ] 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, 9,9,10,10-tetramethyl-9,10-dihydro-1-phenanthryl, 9,9,10,10-tetramethyl-9,10-dihydro-2-phenanthryl, 9,9,10,10-tetramethyl-9,10-dihydro-3-phenanthryl, 9,9,10,10-tetramethyl-9,10-dihydro-4-phenanthryl, etc. ,

[0038] The term "(3- to 30-membered) heteroaryl" or "(3- to 30-membered) heteroarylene" means an aryl group having 3 to 30 ring skeleton atoms and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si and P. The number of heteroatoms is preferably 1 to 4. The above heteroaryl group may be a monocyclic ring, or a condensed ring condensed with at least one benzene ring; may be partially saturated; may be a heteroaryl group formed by connecting at least one heteroaryl group or an aryl group to a heteroaryl group via one or more single bonds; and may include a spiro structure. The above heteroaryl groups may include monocyclic heteroaryl groups, such as furanyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl and pyridazinyl; and condensed ring heteroaryl groups, such as benzofuranyl, benzothienyl, isobenzofuranyl, dibenzofuranyl, benzothiophenyl ... phenyl, naphthobenzofuranyl, naphthobenzothiophenyl, naphthooxazolyl, benzofuranoquinolyl, benzofuranoquinazolinyl, benzofurano naphthyridinyl, benzofuranopyrimidinyl, naphthofuranopyrimidinyl, benzothiophenequinolyl, benzothiophenequinazolinyl, naphthyridinyl, benzothiophene naphthyridinyl, benzothiophene pyrimidinyl, naphthyridinyl, benzothiophene naphthyridinyl, benzothiophene pyrimidinyl, naphthyridinyl pyrimidinyl, pyrimidindolyl, benzopyrimidindolyl, benzofuranopyrazinyl, naphthofuranopyrazinyl, benzothienopyrazinyl, naphthothienopyrazinyl, pyrazinoindolyl, benzopyrazinoindolyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl , cinnolinyl, quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, benzoxazinyl, phenanthridinyl, benzodioxolyl, dihydroacridinyl, benzotriazolyl, phenazinyl, imidazopyridinyl, benzopyranoquinazolinyl, thiobenzopyranoquinazolinyl, dimethylbenzopyrimidinyl, indolecarbazolyl, indenocarbazolyl, etc. More specifically, the above-mentioned heteroaryl groups may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazine-4-yl, 1,2,4-triazine-3-yl, 1,3,5-triazine-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolyl, 2-indolyl, 3-indolyl, 5-indolyl, 6-indolyl, 7-indolyl, 8-indolyl, 2-imidazopyridinyl, 3-imidazopyridinyl, 5-imidazopyridinyl, 6-imidazopyridinyl, 7-imidazopyridinyl, 8-imidazopyridinyl oxazolopyridinyl, 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-furanyl, 3-furanyl, 2-phenylindole 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, azacarbazole-1-yl , azacarbazole-2-yl, azacarbazole-3-yl, azacarbazole-4-yl, azacarbazole-5-yl, azacarbazole-6-yl, azacarbazole-7-yl, azacarbazole-8-yl, azacarbazole-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- 3-Methylpyrrol-5-yl, 3-methylpyrrol-1-yl, 3-methylpyrrol-2-yl, 3-methylpyrrol-4-yl, 3-methylpyrrol-5-yl, 2-tert-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-tert-butyl-1-indolyl, 4-tert-butyl-1-indolyl, 2-tert-butyl-3-indolyl, 4-tert-butyl-3-indolyl, 1-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzofuranyl, 1-dibenzothiophene, 2-dibenzothiophene, 3-dibenzothiophene, 4-dibenzothiophene, 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, 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]-benzothiophene, 2-naphtho-[1,2-b]-benzothiophene, 3-naphtho-[1,2-b]-benzothiophene 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]-benzothiophene, 1-naphtho-[2,3-b]-benzothiophene, 2-naphtho-[2,3-b]-benzothiophene, 3-naphtho-[2,3-b]-benzothiophene, 4-naphtho-[2,3-b]-benzothiophene, 5-naphtho-[2,3-b]-benzothiophene, 1-naphtho-[2,1-b]-benzothiophene 1-b-benzothiophene, 2-naphtho-[2,1-b]-benzothiophene, 3-naphtho-[2,1-b]-benzothiophene, 4-naphtho-[2,1-b]-benzothiophene, 5-naphtho-[2,1-b]-benzothiophene, 6-naphtho-[2,1-b]-benzothiophene, 7-naphtho-[2,1-b]-benzothiophene, 8-naphtho-[2,1-b]-benzothiophene,1-b]-benzothiophenyl, 9-naphtho-[2,1-b]-benzothiophenyl, 10-naphtho-[2,1-b]-benzothiophenyl, 2-benzofurano[3,2-d]pyrimidinyl, 6-benzofurano[3,2-d]pyrimidinyl, 7-benzofurano[3,2-d]pyrimidinyl, 8-benzofurano[3,2-d]pyrimidinyl, 9- benzofurano[3,2-d]pyrimidinyl, 2-benzothieno[3,2-d]pyrimidinyl, 6-benzothieno[3,2-d]pyrimidinyl, 7-benzothieno[3,2-d]pyrimidinyl, 8-benzothieno[3,2-d]pyrimidinyl, 9-benzothieno[3,2-d]pyrimidinyl, 2-benzofurano[3,2-d]pyrazinyl, 6 -Benzofuran[3,2-d]pyrazinyl, 7-Benzofuran[3,2-d]pyrazinyl, 8-Benzofuran[3,2-d]pyrazinyl, 9-Benzofuran[3,2-d]pyrazinyl, 2-Benzothieno[3,2-d]pyrazinyl, 6-Benzothieno[3,2-d]pyrazinyl, 7-Benzothieno[3,2-d]pyrazinyl, 8-benzothieno[3,2-d]pyrazinyl, 9-benzothieno[3,2-d]pyrazinyl, 1-silafluorenyl, 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germaniumfluorenyl, 2-germaniumfluorenyl, 3-germaniumfluorenyl, 4-germaniumfluorenyl, 1-dibenzoselenophenyl, 2-dibenzoselenophenyl, 3-dibenzoselenophenyl, 4-dibenzoselenophenyl, etc. In addition, the term "halogen" includes F, Cl, Br and I. ,

[0039] In addition, "ortho (o-)", "meta (m-)", and "para (p-)" are prefixes, each of which indicates the relative position of a substituent. The ortho position indicates that two substituents are adjacent to each other, and for example, when two substituents in a benzene derivative occupy positions 1 and 2 or positions 2 and 3, this is referred to as the ortho position. The meta position 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, this is referred to as the meta position. The para position 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, this is referred to as the para position.

[0040] In this article, the expression "substituted or unsubstituted" means that the hydrogen atom in a functional group is replaced by another atom or another functional group (i.e., a substituent), and also includes the case where the hydrogen atom is replaced by a group formed by connecting two or more substituents in the above substituents. For example, "a group formed by connecting two or more substituents" can be pyridine-triazine. That is, pyridine-triazine can be interpreted as a heteroaryl substituent, or a substituent in which two heteroaryl substituents are connected. Herein, substituted (C1-C30) alkyl, substituted (C6-C30) (ene) aryl, substituted (3- to 7-membered) (ene) heteroaryl, substituted (C3-C30) cycloalkyl, substituted (C3-C30) cycloalkenyl, substituted (3- to 7-membered) heterocycloalkyl, substituted (C1-C30) alkoxy, substituted tri (C1-C30) alkylsilyl, substituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted (C1-C30) alkyldi (C6-C30) arylsilyl, substituted tri (C6-C30) aryl The one or more substituents of the silyl group, substituted mono- or di-(C1-C30)alkylamino group, substituted mono- or di-(C6-C30)arylamino group, and substituted (C1-C30)alkyl(C6-C30)arylamino group are each independently at least one selected from the group consisting of: deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; (C1-C30)alkyl; halo(C1-C30)alkyl; (C2-C30)alkenyl; (C2-C30)alkynyl; (C1-C30)alkoxy; (C1-C30)alkylthio; (C3-C30)cycloalkyl; (C3-C30)alkylthio; -C30)cycloalkenyl; (3- to 7-membered)heterocycloalkyl; (C6-C30)aryloxy; (C6-C30)arylthio; (5- to 30-membered)heteroaryl unsubstituted or substituted by (C6-C30)aryl; (C6-C30)aryl unsubstituted or substituted by (5- to 30-membered)heteroaryl; tri(C1-C30)alkylsilyl; tri(C6-C30)arylsilyl; di(C1-C30)alkyl(C6-C30)arylsilyl; (C1-C30)alkyldi(C6-C30)arylsilyl; amino; mono- or di-(C1-C30) 0)alkylamino; mono- or di-(C6-C30)arylamino which is unsubstituted or substituted by (C1-C30)alkyl; (C1-C30)alkyl(C6-C30)arylamino; (C1-C30)alkylcarbonyl; (C1-C30)alkoxycarbonyl; (C6-C30)arylcarbonyl; di(C6-C30)arylborylcarbonyl; di(C1-C30)alkylborylcarbonyl; (C1-C30)alkyl(C6-C30)arylborylcarbonyl; (C6-C30)aryl(C1-C30)alkyl; and (C1-C30)alkyl(C6-C30)aryl.For example, one or more substituents may each independently be at least one selected from the group consisting of: carbazolyl, unsubstituted or naphthyl-substituted phenyl, biphenyl, naphthyl, dibenzofuranyl, phenanthryl, benzocarbazolyl, dimethylfluorenyl, or unsubstituted or phenyl-substituted naphthyl.

[0041] In the formula of the present disclosure, when the ring is formed by the connection of adjacent substituents, the ring can be a substituted or unsubstituted, monocyclic or polycyclic (3 to 30 yuan) alicyclic ring or aromatic ring, or a combination thereof, and the ring is formed by the connection of at least two adjacent substituents. 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 ring skeleton atoms is 5 to 20, and according to another embodiment of the present disclosure, the number of ring skeleton atoms is 5 to 15.

[0042] In the formula of the present disclosure, the heteroaryl group or the heteroarylene group may each independently contain at least one heteroatom selected from B, N, O, S, Si, and P. In addition, the heteroatom may be a combination of at least one selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (5- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl, (C1-C30)alkyl(C6-C30)arylsilyl, substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, and substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino.

[0043] Hereinafter, various host materials will be described in more detail.

[0044] The plurality of host materials according to the present disclosure include a first host material including a compound represented by Formula 1 and a second host material including a compound represented by Formula 2. According to one example, the plurality of host materials may be included in a light emitting layer of an organic electroluminescent device.

[0045] The first host material according to one embodiment of the present disclosure may be represented by Formula 1 below.

[0046]

[0047] In formula 1,

[0048] L1 represents a single bond, a substituted or unsubstituted (C6-C30) arylene group, or a substituted or unsubstituted (3- to 30-membered) heteroarylene group. According to one embodiment of the present disclosure, L1 may represent a single bond, a substituted or unsubstituted (C6-C25) arylene group, or a substituted or unsubstituted (5- to 25-membered) heteroarylene group, preferably a single bond, a substituted or unsubstituted (C6-C18) arylene group, or a substituted or unsubstituted (5- to 18-membered) heteroarylene group, more preferably a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted carbazolyl group, or a substituted or unsubstituted benzocarbazolyl group. For example, L1 may represent a single bond, an unsubstituted or deuterium-substituted carbazolylene group, a dibenzofuranylene group, a naphthylene group, an unsubstituted or deuterium-substituted phenylene group, a biphenylene group, a phenanthrylene group, or a benzocarbazolylene group.

[0049] Ar1 represents hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C3-C30) cycloalkenyl, substituted or unsubstituted (3- to 7-membered) heterocycloalkyl, -N-(L2-Ar2)(L3-Ar3), substituted or unsubstituted (C6-C30) aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl. According to one embodiment of the present disclosure, Ar1 may represent hydrogen, deuterium, substituted or unsubstituted (C1-C25) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C3-C25) cycloalkenyl, substituted or unsubstituted (3-7 membered) heterocycloalkyl, -N-(L2-Ar2)(L3-Ar3), substituted or unsubstituted (C6-C25) aryl, or substituted or unsubstituted (3-30 membered) heteroaryl, preferably hydrogen, substituted or unsubstituted substituted or unsubstituted carbazolyl, substituted or unsubstituted phenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted naphthyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted benzocarbazolyl, substituted or unsubstituted dimethylfluorenyl, substituted or unsubstituted diphenylamino, substituted or unsubstituted phenyldibenzofuranylamino, or -N-(L2-Ar2)(L3-Ar3). For example, Ar1 can represent hydrogen; deuterium; unsubstituted or phenyl, naphthyl or biphenyl substituted carbazolyl; unsubstituted or phenyl substituted by deuterium, dibenzofuranyl, phenanthryl, naphthyl, biphenyl, benzocarbazolyl or dimethylfluorenyl; terphenyl; unsubstituted or phenyl or deuterium substituted biphenyl; unsubstituted or phenyl substituted phenanthryl; unsubstituted or phenyl substituted naphthyl; unsubstituted or phenyl substituted dibenzofuranyl or substituted by phenyl, biphenyl or deuterium; dibenzothienyl; phenyl substituted benzocarbazolyl; dimethylfluorenyl; dimethylbenzofluorenyl; spirobifluorenyl; dibenzoselenophenyl; phenylcarbazolylamino; diphenylamino; or -N-(L2-Ar2)(L3-Ar3).

[0050] L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C30) arylene group, or a substituted or unsubstituted (3- to 30-membered) heteroarylene group. According to one embodiment of the present disclosure, L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C25) arylene group, or a substituted or unsubstituted (6- to 25-membered) heteroarylene group, preferably a single bond, a substituted or unsubstituted (C6-C18) arylene group, or a substituted or unsubstituted (6- to 18-membered) heteroarylene group. For example, L2 and L3 each independently represent a single bond, a phenylene group, or an unsubstituted or deuterated carbazolyl group.

[0051] Ar2 and Ar3 each independently represent a substituted or unsubstituted (C1-C30) alkyl group, a substituted or unsubstituted (C3-C30) cycloalkyl group, a substituted or unsubstituted (C3-C30) cycloalkenyl group, a substituted or unsubstituted (3- to 7-membered) heterocycloalkyl group, a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3- to 30-membered) heteroaryl group. According to one embodiment of the present disclosure, Ar2 and Ar3 each independently represent a substituted or unsubstituted (C1-C25) alkyl group, a substituted or unsubstituted (C3-C25) cycloalkyl group, a substituted or unsubstituted (C3-C25) cycloalkenyl group, a substituted or unsubstituted (3- to 7-membered) heterocycloalkyl group, a substituted or unsubstituted (C6-C25) aryl group, or a substituted or unsubstituted (3- to 25-membered) heteroaryl group, preferably a substituted or unsubstituted (C3-C18) alkyl group, a substituted or unsubstituted (C6-C18) cycloalkyl group, a substituted or unsubstituted (C6-C18) cycloalkenyl group, a substituted or unsubstituted (3- to 7-membered) heterocycloalkyl group, a substituted or unsubstituted (C6-C18) aryl group, or a substituted or unsubstituted (3- to 18-membered) heteroaryl group, and more preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted carbazolyl group, a dibenzofuranyl group, or a dibenzothiophenyl group. For example, Ar2 and Ar3 may each independently represent a phenyl group which is unsubstituted or substituted by deuterium, dibenzofuranyl or carbazolyl; a carbazolyl group which is unsubstituted or substituted by deuterium, phenyl, biphenyl or naphthyl; a dibenzofuranyl group which is unsubstituted or substituted by deuterium; or a dibenzothienyl group.

[0052] It can be represented by the following formula 1-1 or formula 1-2.

[0053]

[0054] In formulas 1-1 and 1-2,

[0055] X1 to X 25 Each independently represents N or CR a .

[0056] R aEach independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30) alkyldi(C6-C30) arylsilyl, substituted or unsubstituted tri(C6-C30) arylsilyl, substituted or unsubstituted mono- or di-(C1-C30) alkylamino, substituted or unsubstituted mono- or di-(C6-C30) arylamino, or substituted or unsubstituted (C1-C30) alkyl(C6-C30) arylamino; or may be connected to one or more adjacent substituents to form one or more rings. For example, R a may represent hydrogen, deuterium, a substituted or unsubstituted phenyl group, or may be linked to one or more adjacent substituents to form one or more substituted or unsubstituted aromatic rings.

[0057] According to one embodiment of the present disclosure, X1, X2, X 10 , X 13 , and X 15 To X 18 Each can independently represent CR a , and here R a It may be hydrogen or deuterium, or may be linked to one or more adjacent substituents to form one or more benzene rings.

[0058] * indicates the site of attachment to L1.

[0059] According to one embodiment of the present disclosure, Formula 1 may be represented by the following Formula 1-1-1.

[0060]

[0061] In formula 1-1-1,

[0062] R 41 To R 43Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30) alkyldi(C6-C30) arylsilyl, substituted or unsubstituted tri(C6-C30) arylsilyl, substituted or unsubstituted mono- or di-(C1-C30) alkylamino, substituted or unsubstituted mono- or di-(C6-C30) arylamino, or substituted or unsubstituted (C1-C30) alkyl(C6-C30) arylamino; or may be connected to one or more adjacent substituents to form one or more rings. For example, R 41 To R 43 Each independently may represent hydrogen, deuterium, or a substituted or unsubstituted phenyl group, or may be fused to each other to form one or more substituted or unsubstituted aromatic rings.

[0063] ba may represent an integer from 1 to 3, bb may represent an integer from 1 to 4, bc may represent an integer from 1 to 5, and if ba, bb, and bc each represent an integer of 2 or more, each R 41 , each R 42 and each R 43 May be the same as or different from each other.

[0064] According to one embodiment of the present disclosure, Formula 1-2 may be represented by the following Formula 1-2-1.

[0065]

[0066] In formula 1-2-1,

[0067] R 31 To R 34Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30) alkyldi(C6-C30) arylsilyl, substituted or unsubstituted tri(C6-C30) arylsilyl, substituted or unsubstituted mono- or di-(C1-C30) alkylamino, substituted or unsubstituted mono- or di-(C6-C30) arylamino, or substituted or unsubstituted (C1-C30) alkyl(C6-C30) arylamino; or may be connected to one or more adjacent substituents to form one or more rings. For example, R 31 To R 34 Each independently may represent hydrogen, deuterium, or a substituted or unsubstituted phenyl group, or may be fused to each other to form one or more substituted or unsubstituted aromatic rings.

[0068] aa may represent an integer from 1 to 3, ab and ac may each independently represent an integer from 1 to 4, ad may represent an integer from 1 or 2, and if aa, ab, ac and ad each represent an integer of 2 or more, then each R 31 , each R 32 , each R 33 and each R 34 May be the same as or different from each other.

[0069] According to one embodiment of the present disclosure, at least one of Ar2 and Ar3 in Formula 1 may be represented by any one of the following Formulas 1-3-1 to 1-3-4.

[0070]

[0071]

[0072] In formulas 1-3-1 to 1-3-4,

[0073] T represents O, S, CR5R6, NR7 or Se.

[0074] R3 to R7 have the same definition as Ra, c represents an integer of 1 to 4, d represents an integer of 1 to 3, and if c and d each represent an integer of 2 or more, each R3 and each R4 may be the same as or different from each other.

[0075] For example, T may represent O, S, CR5R6, NR7 or Se, in which case R5 to R7 may each independently represent a methyl group, a phenyl group, a biphenyl group or a naphthyl group.

[0076] As another host material according to one embodiment of the present disclosure, the second host compound is represented by Formula 2 below.

[0077]

[0078] In formula 2,

[0079] X represents O or S.

[0080] L4 and L5 each independently represent a single bond, a substituted or unsubstituted (C6-C30) arylene group, or a substituted or unsubstituted (3- to 30-membered) heteroarylene group. According to one embodiment of the present disclosure, L4 and L5 each independently represent a single bond, a substituted or unsubstituted (C6-C25) arylene group, or a substituted or unsubstituted (3- to 25-membered) heteroarylene group, preferably a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted naphthylene group, or a substituted or unsubstituted dibenzofuranyl group. For example, L4 and L5 each independently represent a single bond, a phenylene group which is unsubstituted or substituted with one or more naphthyl groups, a biphenylene group, a terphenylene group, a phenanthrenyl group, a dibenzofuranyl group which is unsubstituted or substituted with one or more phenyl groups or one or more naphthyl groups, a naphthrenyl group which is unsubstituted or substituted with one or more phenyl groups, a phenanthrenyl group, a phenanthrenyl group, a phenanthrenyl group, a phenanthrenyl group, or a phenanthrenyl group.

[0081] Ar4 and Ar5 each independently represent a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3- to 30-membered) heteroaryl group. According to one embodiment of the present disclosure, Ar4 and Ar5 each independently represent a substituted or unsubstituted (C6-C25) aryl group, preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted quaterphenyl group, a substituted or unsubstituted triphenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted fluoranthene group, or a substituted or unsubstituted triphenylene group. For example, Ar4 and Ar5 can each independently represent a phenyl group which is unsubstituted or substituted by one or more naphthyl groups, one or more phenanthryl groups, one or more biphenyl groups, one or more terphenyl groups, or one or more naphthyl groups substituted by one or more phenyl groups; a biphenyl group which is unsubstituted or substituted by one or more phenyl groups or one or more biphenyl groups; a terphenyl group which is unsubstituted or substituted by one or more phenyl groups; a quaterphenyl group; a triphenylene group; a dibenzofuranyl group which is unsubstituted or substituted by one or more phenyl groups, one or more biphenyl groups, one or more naphthyl groups substituted by one or more phenyl groups, one or more naphthyl groups, one or more phenyl groups substituted by one or more naphthyl groups, or one or more phenanthryl groups; a naphthyl group which is unsubstituted or substituted by one or more phenyl groups, one or more biphenyl groups, or one or more naphthyl groups; a phenanthryl group which is unsubstituted or substituted by one or more phenyl groups, one or more biphenyl groups, or one or more naphthyl groups; a fluoranthenyl group; a triphenylene group; a phenanthro[3,4-d]oxazolyl group substituted by one or more phenyl groups; a phenanthro[4,3-d]oxazolyl group substituted by one or more phenyl groups; a phenanthro[3,4-d]thiazolyl group substituted by one or more phenyl groups.

[0082] R1 and R2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, or -SiR 11 R 12 R 13 . According to one embodiment of the present disclosure, R1 and R2 may each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C25) alkyl, substituted or unsubstituted (C6-C25) aryl, substituted or unsubstituted (3-25) heteroaryl, preferably hydrogen, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, or substituted or unsubstituted phenanthrenyl. For example, R1 and R2 may each independently represent hydrogen, unsubstituted phenyl or substituted by one or more naphthyl, biphenyl, unsubstituted or substituted naphthyl or substituted by one or more phenyl or one or more phenanthrenyl.

[0083] a represents an integer of 1 to 4, b represents an integer of 1 to 3, and if a and b each represent an integer of 2 or more, each R1 and each R2 may be the same as or different from each other.

[0084] According to one embodiment of the present disclosure, Formula 2 may be represented by any one of the following Formulas 2-1 to 2-4.

[0085]

[0086]

[0087] In formulas 2-1 to 2-4,

[0088] X, R1, R2, L4, L5, Ar4, Ar5, a and b have the same definitions as defined in Formula 2.

[0089] According to one embodiment of the present disclosure, the compound represented by Formula 1 may be selected from the group consisting of the following compounds, but is not limited thereto.

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098] In the above compounds, Dn represents that n number of hydrogens are replaced by deuterium.

[0099] According to one embodiment of the present disclosure, the compound represented by Formula 2 may be selected from the group consisting of the following compounds, but is not limited thereto.

[0100]

[0101]

[0102]

[0103]

[0104]

[0105]

[0106]

[0107]

[0108]

[0109]

[0110]

[0111]

[0112]

[0113]

[0114]

[0115] A combination of at least one of Compounds H1-1 to H1-151 and at least one of Compounds C-1 to C-397 can be used in an organic electroluminescent device.

[0116] According to the compound represented by Formula 1 of the present disclosure, specifically the compound represented by Formula 1-1 can be synthesized by referring to the method disclosed in Korean Patent Application No. 2018-0021961 (filed on February 23, 2018), and the compound represented by Formula 1-2 can be synthesized by referring to the method disclosed in Korean Application Publication No. 2018-0012709 (published on February 6, 2018), but these are not limited thereto and can also be prepared by other synthesis methods known to those skilled in the art.

[0117] The compound represented by Formula 2 can be produced by a synthetic method known to those skilled in the art; for example, it can be produced by referring to the following Reaction Scheme 1, but is not limited thereto.

[0118] [Reaction Scheme 1]

[0119]

[0120] In Reaction Scheme 1, X, R1, R2, L4, L5, Ar4, Ar5, a and b have the same definitions as those defined in Formula 2, and Hal represents a halogen.

[0121] Although illustrative synthesis examples of compounds represented by Formulae 1 and 2 are described above, those skilled in the art will be able to easily understand that these are all based on Buchwald-Hartwig cross-coupling reactions, N-arylation reactions, H-mont-mediated etherification reactions, Miyaura borylation reactions, Suzuki cross-coupling reactions, intramolecular acid-induced cyclization reactions, Pd(II)-catalyzed oxidative cyclization reactions, Grignard reactions, Heck reactions, dehydration cyclization reactions, SN1 substitution reactions, SN2 substitution reactions, phosphine-mediated reductive cyclization reactions, and the like, and that the above reactions proceed even if substituents defined in Formulae 1 and 2 but not specified in the specific synthesis examples are bonded.

[0122] Hereinafter, an organic electroluminescent device using the above-mentioned various host materials will be described in more detail.

[0123] The present disclosure provides an organic electroluminescent device, comprising an anode; a cathode; and at least one light-emitting layer between the anode and the cathode, wherein the at least one light-emitting layer comprises a plurality of host materials according to the present disclosure. The first host material and the second host material of the present disclosure may be contained in one light-emitting layer, or may be contained in different light-emitting layers in a plurality of light-emitting layers, respectively. The various host materials of the present disclosure may include a compound represented by Formula 1 and a compound represented by Formula 2 in a ratio of about 1:99 to about 99:1, preferably about 10:90 to about 90:10, more preferably about 30:70 to about 70:30. In addition, the compound represented by Formula 1 and the compound represented by Formula 2 in a desired ratio may be combined by mixing them in an oscillator, by dissolving them in a glass tube by heating, or by dissolving them in a solvent, etc.

[0124] According to one embodiment of the present disclosure, the doping concentration of the dopant compound relative to the host compound of the light-emitting layer can be less than 20wt%. The dopant included in the organic electroluminescent device of the present disclosure can be at least one phosphorescent dopant or fluorescent dopant, and is preferably a phosphorescent dopant. The phosphorescent dopant material applied to the organic electroluminescent device according to the present disclosure is not particularly limited, but can be a metallized complex compound of a metal atom selected from the following items: iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), preferably an ortho-metallized complex compound of a metal atom selected from the following items: iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and more preferably an ortho-metallized iridium complex compound.

[0125] The dopant included in the organic electroluminescent device of the present disclosure may be a compound represented by the following Formula 101, but is not limited thereto.

[0126]

[0127] In formula 101,

[0128] L' is any one selected from the following structures 1 to 3,

[0129] [Structure 1][Structure 2][Structure 3]

[0130]

[0131] R 100 To R 103 Each independently represents hydrogen, deuterium, halogen, unsubstituted or substituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl, cyano, substituted or unsubstituted (3- to 30-membered) heteroaryl, or substituted or unsubstituted (C1-C30) alkoxy; or may be connected to an adjacent substituent to form one or more rings with pyridine, such as substituted or unsubstituted quinoline, benzofuranopyridine, benzothienopyridine, indenopyridine, benzofuranoquinoline, benzothienoquinoline, or indenoquinoline;

[0132] R 104 To R 107 Each independently represents hydrogen, deuterium, halogen, unsubstituted or substituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, cyano, or substituted or unsubstituted (C1-C30) alkoxy; or may be connected to an adjacent substituent to form one or more substituted or unsubstituted rings with benzene, such as substituted or unsubstituted naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuranopyridine, or benzothienopyridine;

[0133] R 201 To R 220 Each independently represents hydrogen, deuterium, halogen, unsubstituted or substituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, or substituted or unsubstituted (C6-C30) aryl; or may be connected to adjacent substituents to form one or more substituted or unsubstituted rings; and

[0134] s represents an integer of 1 to 3.

[0135] Specific examples of the dopant compound are as follows, but are not limited thereto.

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142] The organic electroluminescent device according to the present disclosure includes an anode; a cathode; and at least one organic layer between the anode and the cathode. The organic layer includes a light-emitting layer, and may further include at least one layer selected from any one of the following: a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron transport layer, an electron buffer layer, an electron injection layer, an intermediate layer, a hole blocking layer, and an electron blocking layer. Each of these layers can be further configured into multiple layers.

[0143] The anode and cathode can each be formed of a transparent conductive material, or a semi-transmissive reflective or reflective conductive material. Depending on the type of material forming the anode and cathode, the organic electroluminescent device can be a top-emitting type, a bottom-emitting type, or a two-sided emitting type. In addition, the hole injection layer can be further doped with one or more p-type dopants, and the electron injection layer can be further doped with one or more n-type dopants.

[0144] At least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds may be further contained in the organic layer. In addition, the organic material layer may further contain at least one metal selected from the group consisting of metals of Group 1 of the periodic table, metals of Group 2, transition metals of Period 4, transition metals of Period 5, lanthanoid elements, and organometallic d-transition elements, or at least one complex compound containing the metal.

[0145] In addition, the organic electroluminescent device of the present disclosure can emit white light by further comprising at least one emitting layer, which, in addition to the compounds of the present disclosure, also comprises a blue, red or green emitting compound known in the art. In addition, if necessary, it can further comprise a yellow or orange emitting layer.

[0146] In the organic electroluminescent device of the present disclosure, at least one layer selected from a chalcogenide layer, a metal halide layer, and a metal oxide layer (hereinafter referred to as a "surface layer") is preferably placed on at least one inner surface of a pair of electrodes. Specifically, a chalcogenide (including oxide) layer of silicon and aluminum is preferably placed on the anode surface on the electroluminescent medium layer side, and a metal halide layer or a metal oxide layer is preferably placed on the cathode surface on the electroluminescent medium layer side. The driving stability of the organic electroluminescent device can be obtained by the surface layer. Preferred examples of chalcogenides include SiO X (1≤X≤2), AlO X (1≤X≤1.5), SiON, SiAlON, etc., preferred examples of metal halides include LiF, MgF2, CaF2, rare earth metal fluorides, etc., and preferred examples of metal oxides include Cs2O, Li2O, MgO, SrO, BaO, CaO, etc.

[0147] A hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof may be used between the anode and the light emitting layer. The hole injection layer may be multilayered to reduce the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, wherein two compounds may be used simultaneously in each of the multilayers. The hole transport layer or the electron blocking layer may be multilayered.

[0148] An electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof may be used between the light emitting layer and the cathode. The electron buffer layer may be multilayered to control electron injection and improve the interface characteristics between the light emitting layer and the electron injection layer, wherein two compounds may be used simultaneously in each of the multilayers. The hole blocking layer or the electron transport layer may be multilayered, wherein a plurality of compounds may be used in each of the multilayers.

[0149] The luminescent auxiliary layer may be a layer placed between the anode and the luminescent layer or between the cathode and the luminescent layer. When placed between the anode and the luminescent layer, the luminescent auxiliary layer may be used to promote hole injection and / or hole transport or block the overflow of electrons. When placed between the cathode and the luminescent layer, the luminescent auxiliary layer may be used to promote electron injection and / or electron transport or block the overflow of holes. In addition, the hole auxiliary layer may be placed between the hole transport layer (or hole injection layer) and the luminescent layer, and it may exhibit the effect of promoting or blocking the hole transport rate (or hole injection rate), and thus the charge balance may be adjusted. In addition, the electron blocking layer may be placed between the hole transport layer (or hole injection layer) and the luminescent layer, and it may block the overflow of electrons from the luminescent layer and confine the excitons in the luminescent layer to prevent light leakage. When the organic electroluminescent device includes two or more hole transport layers, the further included hole transport layer may be used as a hole auxiliary layer or an electron blocking layer. The luminescent auxiliary layer, the hole auxiliary layer or the electron blocking layer may have the effect of improving the efficiency and / or life of the organic electroluminescent device.

[0150] In addition, in the organic electroluminescent device of the present disclosure, a mixed region of an electron transport compound and a reductive dopant, or a mixed region of a hole transport compound and an oxidative dopant can be placed on at least one surface of a pair of electrodes. In this case, the electron transport compound is reduced to anions, and thus it becomes easier to inject and transport electrons from the mixed region to the luminescent medium. In addition, the hole transport compound is oxidized to cations, and thus it becomes easier to inject and transport holes from the mixed region to the luminescent medium. Preferred oxidative dopants include various Lewis acids and acceptor compounds, and preferred reductive dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. In addition, an organic electroluminescent device having at least two light-emitting layers and emitting white light can be manufactured by using a reductive dopant layer as a charge generation layer.

[0151] According to one embodiment of the present disclosure, an organic electroluminescent material may be used as a light-emitting material for a white organic light-emitting device. According to the arrangement of R (red), G (green) or YG (yellow-green), and B (blue) light-emitting units, a white organic light-emitting device having various structures has been proposed, such as a side-by-side arrangement method, a stacked arrangement method, or a color conversion material (CCM) method, etc. In addition, according to one embodiment of the present disclosure, the organic electroluminescent material may also be used in an organic electroluminescent device including quantum dots (QDs).

[0152] In order to form each layer of the organic electroluminescent device of the present disclosure, a dry film forming method such as vacuum evaporation, sputtering, plasma, ion plating method, etc., or a wet film forming method such as inkjet printing, nozzle printing, slit coating, spin coating, dip coating, flow coating method, etc. can be used. When forming a film of the first host compound and the second host compound of the present disclosure, co-deposition or mixed deposition is performed.

[0153] When a wet film-forming method is used, a thin film can be formed by dissolving or diffusing the material forming each layer in any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent may be any solvent in which the material forming each layer can be dissolved or diffused and which has no problem in film-forming ability.

[0154] Furthermore, the organic electroluminescent device of the present disclosure may be used to produce a display system, such as a display system for a smartphone, a tablet computer, a notebook, a PC, a TV, or a car; or a lighting system, such as an outdoor or indoor lighting system.

[0155] Hereinafter, the preparation method of the compound of the present disclosure, its characteristics, and the driving voltage and luminous efficiency of the organic electroluminescent device (OLED) containing various host materials according to the present disclosure will be explained in detail with reference to the representative compounds of the present disclosure. However, the following examples only describe the characteristics of the compounds according to the present disclosure and the OLED containing them, and the present disclosure is not limited to the following examples.

[0156] Example 1: Preparation of Compound H-99

[0157]

[0158] In a flask, compound 1 (35g, 120.13mmol), 2-bromo-9-phenyl-9H-carbazole (58g, 180.19mmol), CuI (11g, 60.06mmol), ethylenediamine (8mL, 120.13mmol) and cesium carbonate (Cs2CO3) (78g, 240.26mmol) were dissolved in 600mL o-xylene, and the mixture was stirred under reflux for 6 hours. The mixture was cooled to room temperature, and H2O was added to the solid reaction product, and it was stirred for 30 minutes, filtered, and separated by column chromatography to obtain compound H-99 (29.5g, yield: 46.8%).

[0159] MW MP H-99 532.65 278.6℃

[0160] Example 2: Preparation of Compound H-1

[0161]

[0162] In a flask, compound 1 (10 g, 34.322 mmol), 3-bromo-9-phenyl-9H-carbazole (16.5 g, 51.484 mmol), CuI (3.2 g, 17.162 mmol), ethylenediamine (2.2 mL, 34.322 mmol) and cesium carbonate (Cs2CO3) (22.4 g, 68.646 mmol) were dissolved in 171 mL of o-xylene, and the mixture was stirred under reflux for 6 hours. The mixture was cooled to room temperature, and H2O was added to the solid reaction product, and it was stirred for 30 minutes, filtered, and separated by column chromatography to obtain compound H-1 (11.4 g, yield: 63%).

[0163] MW MP H-1 532.65 167.1℃

[0164] Example 3: Preparation of Compound H-2

[0165]

[0166] In a flask, compound 1 (9 g, 30.8 mmol), 4-bromo-9-phenyl-9H-carbazole (15 g, 46.5 mmol), Cu2SO4 (2.5 g, 15.6 mmol) and potassium carbonate (K2CO3) (8.5 g, 61.5 mmol) were dissolved in 200 mL of o-dichlorobenzene, and the mixture was stirred under reflux for 4 hours. The mixture was cooled to room temperature, and H2O was added to the solid reaction product, and it was stirred for 30 minutes, filtered, and separated by column chromatography to obtain compound H-2 (4 g, yield: 24%).

[0167] MW MP H-2 532.65 248.8℃

[0168] Example 4: Preparation of Compound H-50

[0169]

[0170] In a flask, compound 2 (5g, 15.1mmol), 3-bromo-9-phenyl-9H-carbazole (5.3g, 16.6mmol), tris(dibenzylideneacetone)dipalladium (Pd2dba3) (0.69g, 0.75mmol) and 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl (XPhos) (0.72g, 1.51mmol) and sodium tert-butoxide (3.6g, 37.8mmol) were dissolved in 75mL o-xylene, and the mixture was stirred under reflux for 1.5 hours. The mixture was cooled to room temperature, filtered through diatomaceous earth, and separated by column chromatography to obtain compound H-50 (7.3g, yield: 85%).

[0171] MW MP H-50 571.68 216℃

[0172] Example 5: Preparation of Compound H-100

[0173]

[0174] In a flask, compound 2 (7 g, 21.187 mmol), 2-bromo-9-phenyl-9H-carbazole (7.5 g, 23.31 mmol), tris(dibenzylideneacetone)dipalladium (Pd2dba3) (1.0 g, 1.093 mmol) and 2-dicyclohexylphosphino-2', 4', 6'-triisopropylbiphenyl (XPhos) (1.0 g, 2.118 mmol) and sodium tert-butoxide (3.0 g, 31.78 mmol) were dissolved in 105 mL of o-xylene, and the mixture was stirred at reflux for 1.5 hours. The mixture was cooled to room temperature, filtered through diatomaceous earth, and separated by column chromatography to obtain compound H-100 (6.5 g, yield: 54%).

[0175] MW MP H-100 571.68 204.2℃

[0176] Example 6: Preparation of Compound H-51

[0177]

[0178] In a flask, compound 2 (10 g, 30.2 mmol), 4-bromo-9-phenyl-9H-carbazole (10.7 g, 32 mmol), tris(dibenzylideneacetone)dipalladium (Pd2dba3) (1.4 g, 1.5 mmol) and 2-dicyclohexylphosphino-2', 4', 6'-triisopropylbiphenyl (XPhos) (1.45 g, 3 mmol) and sodium tert-butoxide (7.3 g, 75.96 mmol) were dissolved in 150 mL o-xylene, and the mixture was stirred under reflux for 1 hour. After the reaction was completed, the mixture was extracted with ethyl acetate and separated by column chromatography to obtain compound H-51 (8 g, yield: 46.8%).

[0179] MW MP H-51 571.68 240℃

[0180] Example 7: Preparation of Compound H-111

[0181]

[0182] In a flask, compound 3 (10 g, 22.4 mmol), N, 9-diphenyl-9H-carbazole-1-amine (9 g, 26 mmol), tris(dibenzylideneacetone)dipalladium (Pd2dba3) (1.0 g, 1.1 mmol), 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (SPhos) (900 mg, 2.2 mmol) and sodium tert-butoxide (3.17 g, 33 mmol) were dissolved in 110 mL of xylene, and the mixture was stirred at 160° C. for 3 hours. The mixture was cooled to room temperature, filtered through celite to make a solid, and then separated by column chromatography to obtain compound H-111 (7.1 g, yield: 45.3%).

[0183] MW MP H-111 699.84 211.4℃

[0184] Example 8: Preparation of Compound H-6

[0185]

[0186] In a flask, compound 1 (5.0 g, 17.213 mmol), compound 8 (6.7 g, 18.93 mmol), tris (dibenzylideneacetone) dipalladium (Pd2dba3) (0.78 g, 0.86 mmol), sodium tert-butoxide (2.5 g, 25.819 mmol) and 2-dicyclohexylphosphino-2', 4', 6'-triisopropylbiphenyl (XPhos) (0.82 g, 1.721 mmol) were dissolved in 100 mL of dimethylbenzene, and the mixture was stirred at reflux for 1 hour. After the reaction was complete, the mixture was cooled to room temperature, and filtered through diatomaceous earth to make a solid, and then separated by column chromatography to obtain compound H-6 (7.8 g, yield: 75%).

[0187] Device Examples 1 to 5: Producing a first host compound and a second host compound according to the present disclosure by co-deposition OLED

[0188] Production of OLED according to the present disclosure. First, a transparent electrode indium tin oxide (ITO) film (10Ω / sq) on a glass substrate for OLED (GEOMATEC CO., LTD., Japan) was ultrasonically washed with acetone and isopropanol in sequence, and then stored in isopropanol. The ITO substrate was mounted on a substrate holder of a vacuum vapor deposition device. The compound HI-1 shown in Table 2 was introduced into a chamber of the vacuum vapor deposition device, and the compound HT-1 was introduced into another chamber. The two materials were evaporated at different rates and the compound HI-1 was deposited at a doping amount of 3wt% based on the total amount of compound HI-1 and compound HT-1 to form a first hole injection layer with a thickness of 10nm. Subsequently, compound HT-1 was deposited on the first hole injection layer to form a first hole transport layer with a thickness of 80nm. Next, compound HT-2 was introduced into another chamber of the vacuum vapor deposition device, and the compound was evaporated by applying an electric current to the chamber, thereby depositing a second hole transport layer with a thickness of 60nm on the first hole transport layer. After forming the hole injection layer and the hole transport layer, the light-emitting layer was deposited thereon as follows: Each of the first host compound and the second host compound shown in Table 1 below was introduced as a host into two chambers of a vacuum vapor deposition device, and compound D-39 was introduced as a dopant into another chamber. The two host materials were evaporated at a rate of 1:1, the dopant materials were evaporated simultaneously at different rates, and the dopant was deposited in a doping amount of 3wt% based on the total amount of the host and the dopant to form a light-emitting layer with a thickness of 40nm on the second hole transport layer. Then, compound ET-1 and compound EI-1 were deposited as electron transport materials at a weight ratio of 50:50 to form an electron transport layer with a thickness of 35nm on the light-emitting layer. After compound EI-1 was deposited as an electron injection layer with a thickness of 2nm on the electron transport layer, an Al cathode with a thickness of 80nm was deposited on the electron injection layer using another vacuum vapor deposition device to produce an OLED. All materials used to produce OLEDs were heated to 10 -6 Purify by vacuum sublimation under vacuum.

[0189] Comparative Examples 1 to 5: Production of OLEDs containing comparative compounds as hosts

[0190] OLEDs were produced in the same manner as in Device Examples 1 to 5, except that the second host compound shown in Table 1 below was used as a host of the light-emitting layer.

[0191] Table 1 below shows the driving voltage, luminous efficiency, luminous color at a luminance of 5,000 nits, and the time it takes for the luminance to decrease from 100% to 95% (lifetime: T95) at a luminance of 10,000 nits for the OLEDs of device examples 1 to 5 and comparative examples 1 to 5 produced as described above.

[0192]

Table 1

[0193]

[0194] As can be confirmed from the above Table 1, the OLED using various host materials according to the present disclosure exhibits at least the same or similar levels of driving voltage and luminous efficiency as those of an organic electroluminescent device including a conventional host combination, and exhibits excellent lifespan characteristics.

[0195] The compounds used in the device examples and comparative examples are shown in Table 2 below.

[0196]

Table 2

[0197]

Claims

1. A plurality of host materials, comprising a first host material and a second host material, wherein the first host material comprises a compound represented by the following formula 1, and the second host material comprises a compound represented by the following formula 2: In formula 1, L1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group; Ar1 represents hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C3-C30) cycloalkenyl, substituted or unsubstituted (3- to 7-membered) heterocycloalkyl, -N-(L2-Ar2)(L3-Ar3), substituted or unsubstituted (C6-C30) aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl; L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group; Ar2 and Ar3 each independently represent a substituted or unsubstituted (C1-C30)alkyl group, a substituted or unsubstituted (C3-C30)cycloalkyl group, a substituted or unsubstituted (C3-C30)cycloalkenyl group, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl group, a substituted or unsubstituted (C6-C30)aryl group, or a substituted or unsubstituted (3- to 30-membered)heteroaryl group; It is represented by the following formula 1-1 or 1-2; In formulas 1-1 and 1-2, X1 to X 25 Each independently represents N or CR a ; R a Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be connected to one or more adjacent substituents to form one or more rings; * indicates the site of attachment to L1; In formula 2, X represents O or S; L4 and L5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene group, or a substituted or unsubstituted (3- to 30-membered)heteroarylene group; Ar4 and Ar5 each independently represent a substituted or unsubstituted (C6-C30)aryl group, or a substituted or unsubstituted (3- to 30-membered) heteroaryl group; R1 and R2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, or -SiR 11 R 12 R 13 ; a represents an integer of 1 to 4, b represents an integer of 1 to 3, and if a and b each represent an integer of 2 or more, each R1 and each R2 may be the same as or different from each other.

2. The plurality of host materials according to claim 1, wherein: Formula 1-1 is represented by the following formula 1-1-1: In formula 1-1-1, R 41 To R 43 Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be connected to one or more adjacent substituents to form one or more rings; ba represents an integer from 1 to 3, bb represents an integer from 1 to 4, bc represents an integer from 1 to 5, and if ba, bb and bc each represent an integer of 2 or more, then each R 41 , each R 42 and each R 43 May be the same as or different from each other.

3. The plurality of host materials according to claim 1, wherein: Formula 1-2 is represented by the following formula 1-2-1: In formula 1-2-1, R 31 To R 34 Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl , substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be connected to one or more adjacent substituents to form one or more rings; aa represents an integer of 1 to 3, ab and ac each independently represent an integer of 1 to 4, ad represents an integer of 1 or 2, and if aa, ab, ac and ad each represent an integer of 2 or more, then each R 31 , each R 32 , each R 33 and each R 34 May be the same as or different from each other.

4. The plurality of host materials according to claim 1, wherein: At least one of Ar2 and Ar3 in Formula 1 is represented by any one of the following Formulas 1-3-1 to 1-3-4: In formulas 1-3-1 to 1-3-4, T represents O, S, CR5R6, NR7 or Se, R3 to R7 have the same properties as those of R in claim 1 a The same definition applies, c represents an integer of 1 to 4, d represents an integer of 1 to 3, and if c and d each represent an integer of 2 or more, each R3 and each R4 may be the same as or different from each other.

5. The plurality of host materials according to claim 1, wherein: Formula 2 is represented by any one of the following Formulas 2-1 to 2-4: In formulas 2-1 to 2-4, X, R1, R2, L4, L5, Ar4, Ar5, a and b have the same definitions as defined in claim 1.

6. 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: In the above compounds, Dn represents that n number of hydrogens are replaced by deuterium.

7. 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.

8. An organic electroluminescent device, comprising: anode; cathode; and at least one light-emitting layer between the anode and the cathode, wherein the at least one light-emitting layer comprises a plurality of host materials according to claim 1 .

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