Organic electroluminescent compound, plurality of host materials, and organic

Abstract

The present disclosure relates to an organic electroluminescent compound, 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 various host materials or by comprising the organic electroluminescent compounds according to the present disclosure, an organic electroluminescent device having improved driving voltage, luminous efficiency and / or lifespan characteristics compared to conventional organic electroluminescent devices can be produced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an organic electroluminescent compound, a plurality of host materials, and an organic electroluminescent device. BACKGROUND

[0002] In 1987, Tang et al. of Eastman Kodak first developed a small molecule green organic electroluminescent device (OLED) of a TPD / Alq3 double layer composed of a light-emitting layer and a charge transport layer. Since then, research on OLEDs has rapidly developed, and OLEDs have been commercialized. At present, phosphorescent materials, which provide excellent luminous efficiency in panel implementation, are mainly used in OLEDs. OLEDs having high luminous efficiency and / or long lifespan are required for long-term use and high-resolution displays.

[0003] In order to improve luminous efficiency, driving voltage, and / or lifespan, various materials or concepts for organic layers of an organic electroluminescent device have been proposed, but these have not proven to be satisfactory in actual use. Thus, there is a continued need for the development of an organic electroluminescent device having improved performance such as improved driving voltage, luminous efficiency, power efficiency, and / or lifespan characteristics compared to previously disclosed organic electroluminescent devices.

[0004] PRIOR ART DOCUMENTS

[0005] Document 1: Korean Patent No. 10-2268119 B1 (published on June 21, 2021)

[0006] Document 2: Chinese Patent No. 103187531 B (published on December 14, 2016) SUMMARY

[0007] TECHNICAL PROBLEM

[0008] An object of the present disclosure is to provide an organic electroluminescent compound and a plurality of host materials, which can provide an organic electroluminescent device having improved driving voltage, luminous efficiency, and / or lifespan characteristics.

[0009] SOLUTION TO PROBLEM

[0010] As a result of intensive research conducted in order to solve the above-described technical problem, the present inventors have found that the above object can be achieved by an organic electroluminescent compound represented by the following Formula 1; and a plurality of host materials comprising compounds represented by the following Formulas 1 and 2.

[0011]

[0012] In Formula 1,

[0013] R1to R 12 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C 30 )alkyl group, a substituted or unsubstituted (C6-C 30 )aryl group, a substituted or unsubstituted (3- to 30-membered)heteroaryl group, a substituted or unsubstituted (C3-C 30 )cycloalkyl group, a substituted or unsubstituted (C1-C 30 )alkoxy group, a substituted or unsubstituted tri(C1-C 30 )alkylsilyl group, a substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 )arylsilyl group, a substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 )arylsilyl group, a substituted or unsubstituted tri(C6-C 30 )arylsilyl group, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, a substituted or unsubstituted mono- or di(C1-C 30 )alkylamino group, a substituted or unsubstituted mono- or di(C2-C 30 )alkenylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(C2-C 30 )alkenylamino group, a substituted or unsubstituted mono- or di(C6-C 30 )arylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(C6-C 30 )arylamino group, a substituted or unsubstituted mono- or di(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C2-C 30 )alkenyl(C6-C 30 )arylamino group, a substituted or unsubstituted (C2-C 30 )alkenyl(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C6-C 30 )aryl(3- to 30-membered)heteroarylamino group, or -L1-ETU;

[0014] provided that at least one of R1to R 12 represents -L1-ETU;

[0015] L1each independently represents a single bond, a substituted or unsubstituted (C6-C 30)arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene; and

[0016] ETU each independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted dibenzoquinoxalinyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted dibenzoquinazolinyl group, a substituted or unsubstituted benzofuropyrazinyl group, a substituted or unsubstituted benzothiopyrazinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, or a substituted or unsubstituted benzothiopyrimidinyl group.

[0017]

[0018] In formula 2,

[0019] X1 and Y1 each independently represent -N=, -NR 19 -, -O- or -S-; provided that either one of X1 and Y1 represents -N= and the other of X1 and Y1 represents -NR 19 -, -O-, or -S-;

[0020] R 13 represents substituted or unsubstituted (C6-C 30 )aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl;

[0021] R 14 to R 16 and R 19 Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C 30 )alkyl, substituted or unsubstituted (C6-C 30 )aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C 30 )cycloalkyl, substituted or unsubstituted (C1-C 30 ) alkoxy, substituted or unsubstituted tri(C1-C 30 )alkylsilyl, substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 ) arylsilyl, substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 ) arylsilyl, substituted or unsubstituted tri(C6-C 30 ) arylsilyl, one or more (C3-C 30 ) aliphatic ring and one or more (C6-C 30) a substituted or unsubstituted fused ring group of an aromatic ring, or -L3-N(Ar1)(Ar2); or may be linked to adjacent substituents to form one or more rings;

[0022] R 17 and R 18 Each independently represents a substituted or unsubstituted (C6-C 30 )aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, or -L3-N(Ar1)(Ar2);

[0023] L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C 30 )arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene;

[0024] Ar1 and Ar2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C 30 )alkyl, substituted or unsubstituted (C2-C 30 )alkenyl, one or more (C3-C 30 ) aliphatic ring and one or more (C6-C 30 ) substituted or unsubstituted fused ring group of aromatic ring, substituted or unsubstituted (C6-C 30 )aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl; and b and c each independently represent an integer of 1 or 2, and d represents an integer of 1 to 4, and if b to d represent an integer of 2 or greater, each R 14 To each R 16 They may be the same as or different from each other.

[0025] Beneficial effects of the present invention

[0026] By including the organic electroluminescent compound according to the present disclosure and various host materials, an organic electroluminescent device having improved driving voltage, luminous efficiency, and / or lifespan characteristics may be produced. DETAILED DESCRIPTION

[0027] 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.

[0028] The "organic electroluminescent compound" in the present disclosure is a compound which can be used in an organic electroluminescent device, and can be included in any layer constituting an organic electroluminescent device as needed. For example, the organic electroluminescent material can 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 hole transport zone material can be at least one selected from the group consisting of a hole transport material, a hole injection material, an electron blocking material, a hole auxiliary material, and a light-emitting auxiliary material.

[0029] The "multiple host material" in the present disclosure is a host material including a combination of two or more types of compounds, which can be included in any light-emitting layer constituting an organic electroluminescent device. The organic electroluminescent material can be both a material before being included in an organic electroluminescent device (for example, before vapor deposition) and a material after being included in an organic electroluminescent device (for example, after vapor deposition). For example, the multiple host material of the present disclosure can include a combination of two or more types of host materials, and optionally, it can further include a common material included in an organic electroluminescent material. The two or more types of compounds included in the multiple host material can be included together in one light-emitting layer, or can be included each in a different light-emitting layer. For example, the two or more types of host materials can be mixed and evaporated, co-evaporated, or evaporated separately to form a layer.

[0030] In the present specification, "(C1-C 30 )alkyl" means a linear or branched alkyl group having 1 to 30 carbon atoms constituting a chain, in which the number of carbon atoms is preferably 1 to 20, and more preferably 1 to 10. The above alkyl group can include methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, sec-butyl, etc.

[0031] In the present specification, "(C6-C 30 )aryl" means a monocyclic or fused ring type group derived from an aromatic hydrocarbon having 6 to 30 ring skeleton carbon atoms, which can be partially saturated, in which the number of ring skeleton carbon atoms is preferably 6 to 20, and more preferably 6 to 15. The above aryl group can include a spiro structure. The (hetero)aryl group can include phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, dimethylfluorenyl, diphenylfluorenyl, benzofluorenyl, diphenylbenzofluorenyl, dibenzofluorenyl, phenanthryl, benzophenanthryl, phenylphenanthryl, anthryl, benzanthryl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, benz fluoranyl, benzofluoranthrenyl, tolyl, xylyl, mesityl, cumenyl, spiro[fluorene-fluorenyl]yl, spiro[fluoren-benzofluorenyl]yl, azulenyl, tetramethyl-dihydrophenanthrenyl, and the like. Specifically, the above-mentioned aryl groups may include o-tolyl, m-tolyl, p-tolyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl, o-cumyl, m-cumyl, p-cumyl, p-tert-butylphenyl, p-(2-phenylpropyl)phenyl, 4′-methylbiphenyl, 4″-tert-butyl-p-terphenyl-4-yl, o-biphenyl, m-biphenyl, p-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, 1-naphthyl, 2-naphthyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, 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, 1-anthryl, 2-anthryl, 9-anthryl, 1-phenanthrenyl, 2-phenanthrenyl, 3-phenanthrenyl, 4-phenanthrenyl, 9-phenanthrenyl, 1- Base, 2- Base, 3- Base, 4- Base, 5- Base, 6- Benzo[c]phenanthrenyl, benzo[g] benzo[a]fluoren-1-yl, benzo[a]fluoren-2-yl, benzo[a]fluoren-3-yl, benzo[a]fluoren-4-yl, benzo[a]fluoren-5-yl, benzo[a]fluoren-6-yl, benzo[a]fluoren-7-yl, benzo[a]fluoren-8-yl, benzo[a]fluoren-9-yl, benzo[a]fluoren-10-yl, benzo[b]fluoren-1-yl, benzo[b]fluoren-2-yl, benzo[b]fluoren-3-yl, benzo[b]fluoren-4-yl, benzo[b]fluoren-5-yl, benzo[b]fluoren-6-yl, benzo[b]fluoren-7-yl, benzo[b]fluoren-8-yl, benzo[b]fluoren-9-yl, benzo[b]fluoren-10-yl, benzo[c]fluoren-1-yl, benzo[c]fluoren-2-yl, benzo[c]fluoren-3-yl, benzo[c]fluoren-4-yl, benzo[c]fluoren-5-yl, benzo[c]fluoren-6-yl, benzo[c]fluoren-7-yl, benzo[c]fluoren-8-yl, benzo[c]fluoren-9-yl, benzo[c]fluoren-10-yl, 11,11-diphenyl-benzo[a]fluoren-1-yl, 11,11-diphenyl-benzo[a]fluoren-2-yl, 11,11-diphenyl-benzo[a]fluoren-3-yl, 11,11-diphenyl-benzo[a]fluoren-4-yl, 11,11-diphenyl-benzo[a]fluoren-5-yl, 11,11-diphenyl-benzo[a]fluoren-6-yl, 11,11-diphenyl-benzo[a]fluoren-7-yl, 11,11-diphenyl-benzo[a]fluoren-8-yl, 11,11-diphenyl-benzo[a]fluoren-9-yl, 11,11-diphenyl-benzo[a]fluoren-10-yl, 11,11-diphenyl-benzo[b]fluoren-1-yl, 11,11-diphenyl-benzo[b]fluoren-2-yl, 11,11-diphenyl-benzo[b]fluoren-3-yl, 11,11-diphenyl-benzo[b]fluoren-4-yl, 11,11-diphenyl-benzo[b]fluoren-5-yl, 11,11-diphenyl-benzo[b]fluoren-6-yl, 11,11-diphenyl-benzo[b]fluoren-7-yl, 11,11-diphenyl-benzo[b]fluoren-8-yl, 11,11-diphenyl-benzo[b]fluoren-9-yl, 11,11-diphenyl-benzo[b]fluoren-10-yl, 11,11-diphenyl-benzo[c]fluoren-1-yl, 11,11-diphenyl-benzo[c]fluoren-2-yl, 11,11-diphenyl-benzo[c]fluoren-3-yl, 11,11-diphenyl-benzo[c]fluoren-4-yl, 11,11-diphenyl-benzo[c]fluoren-5-yl, 11,11-diphenyl-benzo[c]fluoren-6-yl, 11,11-diphenyl-benzo[c]fluoren-7-yl, 11,11-diphenyl-benzo[c]fluoren-8-yl, 11,11-diphenyl-benzo[c]fluoren-9-yl, 11,11-diphenyl-benzo[c]fluoren-10-yl,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, 9, 9, 10, 10-tetramethyl-9, 10-dihydro-l-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, and the like.

[0032] In this article, " (3 yuan to 30 yuan) (sub) heteroaryl " means the (sub) aryl of the heteroatom having 3 to 30 ring skeleton atoms and comprising at least one group selected from being composed of B, N, O, S, Si and P, wherein the number of ring skeleton atoms is preferably 3 to 30. The number of heteroatoms is preferably 1 to 4. The above-mentioned (sub) heteroaryl can be a monocycle or a condensed ring with at least one benzene ring, and can be partially saturated. In addition, the above-mentioned (sub) heteroaryl can be a (sub) heteroaryl formed by connecting at least one heteroaryl or aryl to the (sub) heteroaryl via one or more single bonds, and can include a spiro structure. The above-mentioned heteroaryl groups may include monocyclic heteroaryl groups, such as furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc.; and fused ring heteroaryl groups, such as benzofuranyl, benzothienyl, isobenzofuranyl, dibenzofuranyl, benzonaphthofuranyl, benzophenanthiofuranyl, dibenzothiophenylfuranyl, benzonaphthothiophenyl, benzonaphthothiophenyl , benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzophenanthrethiophene, benzisoxazolyl, benzoxazolyl, phenanthroxazolyl, phenanthrothiazolyl, isoindolyl, indolyl, benzindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnozinyl, quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalinyl, naphthyridinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenothiazinyl, phenanthridinyl, benzodioxolyl, dihydroacridinyl, etc. More specifically, the above heteroaryl groups may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidyl, 4-pyrimidyl, 5-pyrimidyl, 6-pyrimidyl, 1,2,3-triazine-4-yl, 1,2,4-triazine-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolizinyl, 2-indolizinyl, 3-indolizinyl, 5-indolizinyl, 6-indolizinyl, 7-indolizinyl, 8-indolizinyl, 2-imidazopyridinyl, 3-imidazopyridinyl, 5-imidazopyridinyl, 6-imidazopyridinyl, 7-imidazopyridinyl, 8-imidazopyridinyl, 3-pyridyl, 4-pyridyl, 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-benzofuryl, 3-benzofuryl, 4-benzofuryl, 5-benzofuryl, 6-benzofuryl, 7-benzofuryl, 1-isobenzofuryl, 3-isobenzofuryl, 4-isobenzofuryl, 5-isobenzofuryl, 6-isobenzofuryl, 7-isobenzofuryl, 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-thiophenyl, 3-thiophenyl, 2-methylpyrrolyl, 3-methylpyrrolyl, 2-methylpyrrolyl, 4-methylpyrrolyl, 3-methylpyrrolyl, 5-methylpyrrolyl, 2-tert-butylpyrrolyl, 3-(2-phenylpropyl)pyrrolyl, 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-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho-[1,2-b]-benzofuranyl, 2-naphtho-[l,2-b]-benzofuranyl, 3-naphtho-[l,2-b]- benzofuranyl, 4-naphtho-[l,2-b]-benzofuranyl, 5-naphtho-[l,2-b]-benzofuranyl, 6- naphtho-[l,2-b]-benzofuranyl, 7-naphtho-[l,2-b]-benzofuranyl, 8-naphtho-[l,2-b]- benzofuranyl, 9-naphtho-[l,2-b]-benzofuranyl, 10-naphtho-[l,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, l-b]-benzofuranyl, 2-naphtho-[2, l-b]-benzofuranyl, 3-naphtho-[2, l-b]- benzofuranyl, 4-naphtho-[2, l-b]-benzofuranyl, 5-naphtho-[2, l-b]-benzofuranyl, 6- naphtho-[2, l-b]-benzofuranyl, 7-naphtho-[2, l-b]-benzofuranyl, 8-naphtho-[2, l-b]- benzofuranyl, 9-naphtho-[2, l-b]-benzofuranyl, 10-naphtho-[2, l-b]-benzofuranyl, 1- naphtho-[l,2-b]-benzothiophenyl, 2-naphtho-[l,2-b]-benzothiophenyl, 3-naphtho-[l,2- b]-benzothiophenyl, 4-naphtho-[l,2-b]-benzothiophenyl, 5-naphtho-[l,2-b]- benzothiophenyl, 6-naphtho-[l,2-b]-benzothiophenyl, 7-naphtho-[l,2-b]- benzothiophenyl, 8-naphtho-[l,2-b]-benzothiophenyl, 9-naphtho-[l,2-b]- benzothiophenyl, 10-naphtho-[l,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, l-b]-benzothiophenyl, 2-naphtho-[2, l-b]- benzothiophenyl, 3-naphtho-[2, l-b]-benzothiophenyl, 4-naphtho-[2, l-b]-1-b]-benzothiophenyl, 9-naphtho-[2,1-b]-benzothiophenyl, 10-naphtho-[2,1-b]- benzothiophenyl, 2-benzofuro[3,2-d]pyrimidinyl, 6-benzofuro[3,2-d]pyrimidinyl, 7- benzofuro[3,2-d]pyrimidinyl, 8-benzofuro[3,2-d]pyrimidinyl, 9-benzofuro[3,2-d]pyrimidinyl, 2-benzothia[3,2-d]pyrimidinyl, 6-benzothia[3,2-d]pyrimidinyl, 7-benzothia[3,2-d]pyrimidinyl, 8-benzothia[3,2-d]pyrimidinyl, 9-benzothia[3,2-d]pyrimidinyl, 2-benzofuro[3,2-d]pyrazinyl, 6-benzofuro[3,2-d]pyrazinyl, 7-benzofuro[3,2-d]pyrazinyl, 8-benzofuro[3,2-d]pyrazinyl, 9-benzofuro[3,2-d]pyrazinyl, 2-benzothia[3,2-d]pyrazinyl, 6-benzothia[3,2-d]pyrazinyl, 7-benzothia[3,2-d]pyrazinyl, 8-benzothia[3,2-d]pyrazinyl, 9-benzothia[3,2-d]pyrazinyl, 1-silafuorenyl, 2-silafuorenyl, 3-silafuorenyl, 4-silafuorenyl, 1-gerafuorenyl, 2-gerafuorenyl, 3-gerafuorenyl, 4-gerafuorenyl, 1-dibenzoselenophenyl, 2-dibenzoselenophenyl, 3-dibenzoselenophenyl, 4-dibenzoselenophenyl, and the like.

[0033] Herein, "(C3-C 30 ) cycloalkyl" means a monocyclic or polycyclic hydrocarbon having 3 to 30 ring skeleton carbon atoms, wherein the number of ring skeleton carbon atoms is preferably 3 to 20, and more preferably 3 to 7. The above cycloalkyl group can include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclohexylmethyl, and the like.

[0034] Herein, the term "(3- to 7-membered) heterocycloalkyl" means a cycloalkyl group having 3 to 7 ring skeleton atoms and containing at least one heteroatom. For example, the number of ring skeleton atoms can be 5 to 7. According to one embodiment of the present disclosure, the heteroatom can be at least one selected from the group consisting of B, N, O, S, Si, and P, and according to another embodiment of the present disclosure, the heteroatom can be at least one selected from the group consisting of O, S, and N. The above heterocycloalkyl group can include tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, and the like.

[0035] Herein, "one or more (C3-C 30 ) aliphatic rings and one or more (C6-C 30)Fused ring group of aromatic ring" means a functional group in which at least one aliphatic ring having 3 to 30 ring skeleton carbon atoms is fused with at least one aromatic ring having 6 to 30 ring skeleton carbon atoms. According to one embodiment of the present disclosure, the above-mentioned (C3-C 30 )Aliphatic ring can have 3 to 25 ring skeleton carbon atoms, and according to another embodiment, can have 3 to 18 ring skeleton carbon atoms. According to one embodiment of the present disclosure, the above-mentioned (C6-C 30 )Aromatic ring can have 6 to 25 ring skeleton carbon atoms, and according to another embodiment of the present disclosure, can have 6 to 18 ring skeleton carbon atoms. Specific examples of the fused ring group include a fused ring group of one or more benzene and one or more cyclohexane, or a fused ring group of one or more naphthalene and one or more cyclopentane, etc. Herein, the carbon atoms of the fused ring group of one or more (C3-C 30 )Aliphatic ring and one or more (C6-C 30 )Aromatic ring can be replaced with one or more heteroatoms selected from B, N, O, S, Si, and P, and for example, one or more heteroatoms selected from N, O, and S.

[0036] Herein, "halogen" includes F, Cl, Br, and I.

[0037] Further, "ortho-" ("o-"), "meta-" ("m-"), and "para-" ("p-") are prefixes that denote the relative positions of substituents. The prefix "ortho-" indicates that two substituents are adjacent to each other; for example, when two substituents in a benzene derivative occupy positions 1 and 2, this is referred to as the "ortho-" configuration. The prefix "meta-" indicates that two substituents are at positions 1 and 3; for example, when two substituents in a benzene derivative occupy positions 1 and 3, this is referred to as the "meta-" configuration. The prefix "para-" indicates that two substituents are at positions 1 and 4; for example, when two substituents in a benzene derivative occupy positions 1 and 4, this is referred to as the "para-" configuration.

[0038] In this context, "a ring formed by connection with adjacent substituents" means that at least two adjacent substituents are connected or fused with each other to form a substituted or unsubstituted monocyclic or polycyclic (3- to 30-membered) alicyclic ring or aromatic ring, or a combination thereof. For example, the ring can be a substituted or unsubstituted monocyclic or polycyclic (5- to 25-membered) alicyclic ring or aromatic ring, or a combination thereof. According to one embodiment of the present disclosure, the number of ring backbone atoms can be (5- to 20-membered), and according to another embodiment of the present disclosure, it can be (5- to 15-membered). Further, the ring can contain at least one heteroatom selected from B, N, O, S, Si, and P, and for example, at least one heteroatom selected from N, O, and S. For example, the ring can be a substituted or unsubstituted dibenzothiophene ring, a substituted or unsubstituted dibenzofuran ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted benzofluorene ring, a substituted or unsubstituted benzothiophene ring, a substituted or unsubstituted benzofuran ring, a substituted or unsubstituted indole ring, a substituted or unsubstituted indene ring, a substituted or unsubstituted benzene ring, or a substituted or unsubstituted carbazole ring, and the like.

[0039] In this context, "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). Substituents also include those in which two or more substituents are connected. For example, a substituent formed by connecting two or more substituents can be pyridine-triazine. That is, pyridine-triazine can be interpreted as a heteroaryl group, or one or more substituents having two connected heteroaryl groups.

[0040] Herein, substituted alkyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted cycloalkyl, substituted alkoxy, substituted trialkylsilyl, substituted dialkylarylsilyl, substituted alkyldiarylsilyl, substituted triarylsilyl, a substituted condensed ring group of one or more aliphatic rings and one or more aromatic rings, substituted mono- or dialkylamino, substituted mono- or dialkenylamino, substituted alkylalkenylamino, substituted mono- or diarylamino, substituted alkylarylamino, substituted mono- or diheteroarylamino, substituted alkylheteroarylamino, substituted The alkenylarylamino, substituted alkenylheteroarylamino, substituted arylheteroarylamino, substituted pyridyl, substituted pyrimidyl, substituted triazinyl, substituted quinolinyl, substituted quinazolinyl, substituted quinoxalinyl, substituted benzoquinoxalinyl, substituted dibenzoquinoxalinyl, substituted benzoquinazolinyl, substituted dibenzoquinazolinyl, substituted benzofuranopyrazinyl, substituted benzothiopyrazinyl, substituted benzofuranopyrimidinyl and substituted benzothiopyrimidinyl are each independently substituted by at least one selected from the group consisting of deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; phosphine oxide; (C1-C 30 )alkyl; halo(C1-C 30 )alkyl; (C2-C 30 )alkenyl; (C2-C 30 )alkynyl; (C1-C 30 ) alkoxy; (C1-C 30 )alkylthio; (C3-C 30 )cycloalkyl; (C3-C 30 )cycloalkenyl; (3- to 7-membered)heterocycloalkyl; (C6-C 30 ) aryloxy; (C6-C 30 ) arylthio; unsubstituted or (C1-C 30 )alkyl and (C6-C 30 ) aryl, at least one substituted (3- to 30-membered) heteroaryl; unsubstituted or substituted by deuterium, cyano, halogen, (C1-C 30 )alkyl, (C3-C 30 )cycloalkyl, tri(C1-C 30 )alkylsilyl, tri(C6-C 30 ) arylsilyl, (C6-C 30 ) aryl, and (3- to 30-membered) heteroaryl substituted with at least one of (C6-C 30 )aryl; tri(C1-C 30 )alkylsilyl; tri(C6-C 30 ) arylsilyl; di(C1-C 30 )alkyl(C6-C 30) arylsilyl; (C1-C 30 )alkyldi(C6-C 30 ) arylsilyl; one or more (C3-C 30 ) aliphatic ring and one or more (C6-C 30 ) aromatic ring fused ring group; amino; mono- or di-(C1-C 30 ) alkylamino; mono- or di-(C2-C 30 )alkenylamino; (C1-C 30 )alkyl(C2-C 30 )alkenylamino; mono- or di-(C6-C 30 ) arylamino; (C1-C 30 )alkyl(C6-C 30 )arylamino; mono- or di-(3- to 30-membered) heteroarylamino; (C1-C 30 )alkyl (3-30 membered) heteroarylamino; (C2-C 30 )alkenyl (C6-C 30 ) arylamino; (C2-C 30 )alkenyl(3-30 membered)heteroarylamino; (C6-C 30 )aryl(3-30 membered)heteroarylamino; (C1-C 30 )alkylcarbonyl; (C1-C 30 ) alkoxycarbonyl; (C6-C 30 ) arylcarbonyl; (C6-C 30 ) arylphosphinyl; di(C6-C 30 ) aryl boron carbonyl; di(C1-C 30 )alkylborane; (C1-C 30 )alkyl(C6-C 30 ) aryl boron carbonyl; (C6-C 30 )aryl(C1-C 30 )alkyl; and (C1-C 30 )alkyl(C6-C 30 )aryl.

[0041] As used herein, "combinations thereof" means combinations of one or more elements from the corresponding list to form known or chemically stable arrangements that can be envisioned by a person skilled in the art from the corresponding list. For example, alkyl and deuterium can be combined to form partially or fully deuterated alkyl groups; halogen and alkyl can be combined to form haloalkyl substituents; and halogen, alkyl, and aryl can be combined to form haloarylalkyl groups. For example, preferred substituent combinations contain up to 50 atoms that are not hydrogen or deuterium, up to 40 atoms that are not hydrogen or deuterium, or up to 30 atoms that are not hydrogen or deuterium, but in many cases, preferred substituent combinations can contain up to 20 atoms that are not hydrogen or deuterium.

[0042] Hereinafter, an organic electroluminescent compound, various host materials, and an organic electroluminescent device including the same according to the present disclosure will be described.

[0043] The organic electroluminescent compound according to the present disclosure is represented by Formula 1 below.

[0044]

[0045] In Formula 1, R1 to R 12 Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C 30 )alkyl, substituted or unsubstituted (C6-C 30 )aryl, substituted or unsubstituted (3- to 30-membered) heteroaryl, substituted or unsubstituted (C3-C 30 )cycloalkyl, substituted or unsubstituted (C1-C 30 ) alkoxy, substituted or unsubstituted tri(C1-C 30 )alkylsilyl, substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 ) arylsilyl, substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 ) arylsilyl, substituted or unsubstituted tri(C6-C 30 ) arylsilyl, one or more (C3-C 30 ) aliphatic ring and one or more (C6-C 30 ) substituted or unsubstituted fused ring groups of aromatic rings, substituted or unsubstituted mono- or di-(C1-C 30 )alkylamino, substituted or unsubstituted mono- or di-(C2-C 30 )alkenylamino, substituted or unsubstituted (C1-C 30 )alkyl(C2-C 30 )alkenylamino, substituted or unsubstituted mono- or di-(C6-C 30 ) arylamino, substituted or unsubstituted (C1-C 30 )alkyl(C6-C 30 )arylamino, substituted or unsubstituted mono- or di-(3- to 30-membered) heteroarylamino, substituted or unsubstituted (C1-C 30 )alkyl (3 to 30 members) heteroarylamino, substituted or unsubstituted (C2-C 30 )alkenyl (C6-C 30 ) arylamino, substituted or unsubstituted (C2-C 30 )alkenyl (3 to 30 membered) heteroarylamino, substituted or unsubstituted (C6-C 30) aryl(3- to 30-membered)heteroaryl, or -L1-ETU. According to one embodiment of the present disclosure, R1to R 12 each independently represent hydrogen, deuterium, substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted anthryl, substituted or unsubstituted fluorenyl, substituted or unsubstituted benzofluorenyl, substituted or unsubstituted triphenylenyl, substituted or unsubstituted spirobifluorenyl, substituted or unsubstituted pyridyl, substituted or unsubstituted triazinyl, substituted or unsubstituted pyrimidinyl, substituted or unsubstituted quinolyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted benzoquinazolinyl, substituted or unsubstituted benzoquinoxalinyl, substituted or unsubstituted benzofuropyrimidinyl, substituted or unsubstituted carbazolyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted benzothiophenyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted naphthylridinyl, substituted or unsubstituted benzonaphthofuranyl, substituted or unsubstituted benzonaphthothiophenyl, or -L1-ETU. According to another embodiment of the present disclosure, R1to R 12 each independently represent hydrogen, deuterium, substituted or unsubstituted triazinyl, substituted or unsubstituted pyrimidinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, or -L1-ETU. For example, R1to R 12 each independently can be hydrogen; deuterium; triazinyl substituted with one or more phenyl, one or more biphenyl, one or more naphthyl, one or more phenanthryl, one or more dibenzofuranyl, one or more dibenzothiophenyl, and / or one or more carbazolyl substituted with one or more phenyl; pyrimidinyl substituted with one or more phenyl; quinazolinyl substituted with one or more phenyl; quinoxalinyl substituted with one or more phenyl; or -L1-ETU.

[0046] In Formula 1, at least one of R1to R 12 represents -L1-ETU. According to one embodiment of the present disclosure, at least one of R1to R 12 represents -L1-ETU, and the others represent hydrogen or deuterium.

[0047] In Formula 1, L1each independently represents a single bond, substituted or unsubstituted (C6-C 30 )arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene. According to one embodiment of the present disclosure, L1each independently represents a single bond, or substituted or unsubstituted (C6-C 20 )arylene. For example, L1each independently can be a single bond, phenylene, or naphthylene.

[0048] In Formula 1, ETU each independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolyl group, a substituted or unsubstituted quinoxalyl group, a substituted or unsubstituted benzoquinoxalyl group, a substituted or unsubstituted dibenzoquinoxalyl group, a substituted or unsubstituted benzoquinazolyl group, a substituted or unsubstituted dibenzoquinazolyl group, a substituted or unsubstituted benzo-furo-pyrazinyl group, a substituted or unsubstituted benzo-thio-pyrazinyl group, a substituted or unsubstituted benzo-furo-pyrimidinyl group, or a substituted or unsubstituted benzo-thio-pyrimidinyl group. According to one embodiment of the disclosure, ETU represents a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted quinazolyl group, or a substituted or unsubstituted quinoxalyl group. For example, ETU can be a triazinyl group substituted with one or more phenyl groups, one or more biphenyl groups, one or more naphthyl groups, one or more phenanthryl groups, one or more dibenzofuranyl groups, one or more dibenzothiophenyl groups, and / or one or more carbazolyl groups substituted with one or more phenyl groups; a pyrimidyl group substituted with one or more phenyl groups; a quinazolyl group substituted with one or more phenyl groups; or a quinoxalyl group substituted with one or more phenyl groups.

[0049] The compound represented by Formula 1 can be selected from the following compounds, but is not limited thereto.

[0050]

[0051]

[0052]

[0053] The host material according to the disclosure can be a single host material or a mixture of two or more host materials. The host material according to the disclosure can be a mixture of a first host material and a second host material different from the first host material. The first host material can include the organic electroluminescent compound according to the disclosure.

[0054] The second host material can include a compound represented by the following Formula 2.

[0055]

[0056] In Formula 2, X1and Y1each independently represent -N=, -NR 19 -, -O-, or -S-; provided that one of X1and Y1represents -N=, and the other of X1and Y1represents -NR 19 -, -O-, or -S-. For example, one of X1and Y1may be -N=, and the other of X1and Y1may be -O- or -S-.

[0057] In Formula 2, R 13 represents a substituted or unsubstituted (C6-C 30substituted or unsubstituted (3- to 30-membered)heteroaryl. According to one embodiment of the present disclosure, R 13 represents a substituted or unsubstituted (C6-C 20 )aryl, or a substituted or unsubstituted (3- to 20-membered)heteroaryl. For example, R 13 may be phenyl, biphenyl, naphthyl, or pyridyl.

[0058] In Formula 2, R 14 to R 16 and R 19 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C 30 )alkyl, a substituted or unsubstituted (C6-C 30 )aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C 30 )cycloalkyl, a substituted or unsubstituted (C1-C 30 )alkoxy, a substituted or unsubstituted tri(C1-C 30 )alkylsilyl, a substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 )arylsilyl, a substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 )arylsilyl, a substituted or unsubstituted tri(C6-C 30 )arylsilyl, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, or -L3-N(Ar1)(Ar2); or can be linked to an adjacent substituent to form one or more rings. According to one embodiment of the present disclosure, R 14 to R 16 and R 19 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C 30 )alkyl, a substituted or unsubstituted (C6-C 30 )aryl, or -L3-N(Ar1)(Ar2). According to one embodiment of the present disclosure, R 14 to R 16 and R 19 each independently represent hydrogen, a substituted or unsubstituted (C1-C 20 )alkyl, or -L3-N(Ar1)(Ar2). For example, R 14 to R 16 and R 19 each independently can be hydrogen, or -L3-N(Ar1)(Ar2).

[0059] In Formula 2, R 17 and R 18 each independently represent a substituted or unsubstituted (C6-C 30 ) aryl group, a substituted or unsubstituted (3- to 30-membered) heteroaryl group, or -L3-N(Ar1)(Ar2). According to one embodiment of the disclosure, R 17 and R 18 each independently represent a substituted or unsubstituted (C6-C 25 ) aryl group, a substituted or unsubstituted (3- to 20-membered) heteroaryl group, or -L3-N(Ar1)(Ar2). For example, R 17 and R 18 each independently can be a phenyl group that is unsubstituted or substituted with one or more naphthyl groups, one or more biphenyl groups, one or more phenoxazinyl groups, one or more phenylpyridyl groups, one or more anthryl groups, one or more fluoranthenyl groups, one or more triphenylsilyl groups, or deuterium; a biphenyl group that is unsubstituted or substituted with one or more biphenyl groups or one or more triphenylsilyl groups; a naphthyl group that is unsubstituted or substituted with one or more phenyl groups; a dibenzofuranyl group that is unsubstituted or substituted with one or more phenyl groups or one or more pyridyl groups; a dibenzothiophenyl group that is unsubstituted or substituted with one or more phenyl groups; a benzonaphthofuranyl group; a benzonaphthothiophenyl group; a dimethylfluorenyl group; a diphenylfluorenyl group; a dimethylbenzofluorenyl group; a carbazolyl group that is unsubstituted or substituted with one or more phenyl groups; a phenanthryl group; an ortho-terphenyl group; a meta-terphenyl group; a para-terphenyl group; a tetraphenyl group; a dimethylphenyl group; a t-butylbenzyl group; a phenoxazinyl group; a pyridyl group; a phenylpyridyl group; a diphenylpyridyl group; an anthryl group; a fluoranthenyl group; a spirobifluorenyl group; a benzoimidazolyl group substituted with one or more phenyl groups; a triphenylsilyl group; a diphenylbiphenylsilyl group; a diphenylnaphthylsilyl group; a benzofuro[3,2-c]pyridinyl group; an unsubstituted (C 22 ) aryl group; or -L3-N(Ar1)(Ar2).

[0060] In Formula 2, L2and L3each independently represent a single bond, a substituted or unsubstituted (C6-C 30 ) arylene group, or a substituted or unsubstituted (3- to 30-membered) heteroarylene group. According to one embodiment of the disclosure, L2and L3each independently represent a single bond, or a substituted or unsubstituted (C6-C 20 ) arylene group. For example, L2and L3each independently can be a single bond, a phenylene group, or a naphthylene group.

[0061] Ar1and Ar2each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C 30 ) alkyl group, a substituted or unsubstituted (C2-C 30 ) alkenyl group, one or more (C3-C 30) aliphatic ring and one or more (C6-C 30 ) substituted or unsubstituted fused ring group of aromatic ring, substituted or unsubstituted (C6-C 30 ) aryl, or substituted or unsubstituted (3- to 30-membered) heteroaryl. According to one embodiment of the present disclosure, Ar1 and Ar2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C 30 )alkyl, or substituted or unsubstituted (C6-C 30 According to another embodiment of the present disclosure, Ar1 and Ar2 each independently represent hydrogen, deuterium, substituted or unsubstituted (C1-C 20 )alkyl, or substituted or unsubstituted (C6-C 20 ) aryl. For example, Ar1 and Ar2 can each independently be phenyl.

[0062] In Formula 2, b and c each independently represent an integer of 1 or 2, and d represents an integer of 1 to 4, and if b to d represent an integer of 2 or greater, each R 14 To each R 16 They may be the same as or different from each other.

[0063] The compound represented by Formula 2 may be selected from the following compounds, but is not limited thereto.

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071] The compound represented by Formula 1 according to the present disclosure can be produced by a synthesis method known to those skilled in the art. For example, the compound represented by Formula 1 can be synthesized by referring to the following Reaction Scheme 1, but is not limited thereto.

[0072] [Reaction Scheme 1]

[0073]

[0074] In Reaction Scheme 1, R1 to R 12 As defined in Equation 1.

[0075] The compound represented by Formula 2 according to the present disclosure can be produced by a synthetic method known to one skilled in the art. For example, the compound represented by Formula 2 can be synthesized by referring to Korean Patent Application Publication Nos. 2017-0022865 (published on March 2, 2017) and 2018-0099487 (published on September 5, 2018), etc., but is not limited thereto.

[0076] While the above describes illustrative synthetic examples of the compounds represented by Formulas 1 and 2, one skilled in the art will be able to readily understand that these are all based on Buchwald-Hartwig cross-coupling reaction, N-arylation reaction, H-mont-mediated etherification reaction, Miyaura borylation reaction, Suzuki cross-coupling reaction, intramolecular acid-induced cyclization reaction, Pd(II)-catalyzed oxidative cyclization reaction, Grignard reaction, Heck reaction, dehydration cyclization reaction, S N 1 substitution reaction, S N 2 substitution reaction, phosphine-mediated reductive cyclization reaction, etc., and even when a substituent defined in Formulas 1 and 2 but not specified in the specific synthetic examples is bonded, the above reactions continue to proceed.

[0077] An organic electroluminescent device according to the present disclosure includes an anode; a cathode; and at least one light-emitting layer between the anode and the cathode, wherein at least one layer of the light-emitting layer contains a plurality of host materials including a first host material and a second host material different from the first host material, the first host material including an organic electroluminescent compound represented by Formula 1. Herein, a weight ratio of the organic electroluminescent compound included in the first host material (hereinafter, “first host compound”) and the compound included in the second host material (hereinafter, “second host compound”) contained in the light-emitting layer can be in the range 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, more preferably about 40:60 to about 60:40, and even more preferably about 50:50. For example, the plurality of host materials of the present disclosure can include at least one compound of the first host compounds H2-1 to H2-75 and at least one compound of the second host compounds H1-1 to H1-193. The plurality of host materials can be contained in the same organic layer (e.g., light-emitting layer), or can be contained in different light-emitting layers, respectively.

[0078] The organic electroluminescent device according to one embodiment of the present disclosure can further include one or more dopants in the light-emitting layer.

[0079] The dopant included in the organic electroluminescent device according to one embodiment of the disclosure can be at least one phosphorescent or fluorescent dopant, and preferably a phosphorescent dopant. The phosphorescent dopant material applied to the organic electroluminescent device according to the disclosure is not particularly limited, but can be a complex compound of a metal selected from the group consisting of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt). Preferably, the complex compound of a metal can be a ortho-metalated complex compound of a metal selected from the group consisting of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and more preferably, it can be an ortho-metalated iridium complex compound.

[0080] The dopant included in the organic electroluminescent device of the disclosure can be a compound represented by Formula 101 below, but is not limited thereto.

[0081]

[0082] In Formula 101,

[0083] L' is selected from the following Structures 1 to 3:

[0084]

[0085] R 100 to R 103 each independently represent hydrogen, deuterium, halogen, (C1-C 30 )alkyl which is unsubstituted or substituted with deuterium and / or one or more halogens, substituted or unsubstituted (C3-C 30 )cycloalkyl, substituted or unsubstituted (C6-C 30 )aryl, cyano, substituted or unsubstituted (3- to 30-membered)heteroaryl, or substituted or unsubstituted (C1-C 30 )alkoxy; or can be linked to one or more adjacent substituents to form one or more rings together with pyridine, for example, substituted or unsubstituted quinoline, isoquinoline, benzofuro[3,2-g]pyridine, benzothieno[3,2-g]pyridine, indeno[1,2-g]pyridine, benzofuro[3,2-g]quinoline, benzothieno[3,2-g]quinoline, or indeno[1,2-g]quinoline;

[0086] R 104 to R 107 each independently represent hydrogen, deuterium, halogen, (C1-C 30 )alkyl which is unsubstituted or substituted with deuterium and / or one or more halogens, substituted or unsubstituted (C3-C 30 )cycloalkyl, substituted or unsubstituted (C6-C 30 )aryl, substituted or unsubstituted (3- to 30-membered)heteroaryl, cyano, or substituted or unsubstituted (C1-C 30)alkyl, substituted or unsubstituted (C3-C8)cycloalkyl, or substituted or unsubstituted (C6-C10)aryl; or can be linked to one or more adjacent substituents to form one or more substituted or unsubstituted rings; and

[0087] R 201 to R 220 each independently represent hydrogen, deuterium, halogen, (C1-C4)alkyl, (C1-C4)alkoxy, or (C1-C4)haloalkyl; or can be linked to one or more adjacent substituents to form one or more substituted or unsubstituted rings, for example, substituted or unsubstituted naphthalene, fluorene, dibenzothiophene, dibenzofuran, indolizine, benzofuropyridine, or benzothienopyridine; 30 )alkyl, substituted or unsubstituted (C3-C 30 )alkyl, substituted or unsubstituted (C3-C 30 )aryl; or can be linked to one or more adjacent substituents to form one or more substituted or unsubstituted rings; and

[0088] s represents an integer of 1 to 3.

[0089] Specific examples of the dopant compound are as follows, but are not limited thereto.

[0090]

[0091]

[0092]

[0093]

[0094]

[0095] The organic layer includes an emission layer, and can further include at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, a hole auxiliary layer, an emission auxiliary layer, an electron transport layer, an electron injection layer, an intermediate layer, a hole blocking layer, an electron blocking layer, and an electron buffer layer. The organic layer can further include an amine-based compound and / or an azine-based compound in addition to the light-emitting material of the present disclosure. Specifically, the hole injection layer, the hole transport layer, the hole auxiliary layer, the emission layer, the emission auxiliary layer, or the electron blocking layer can include an amine-based compound, such as an arylamine-based compound, a styrylarylamine-based compound, or the like, as a hole injection material, a hole transport material, a hole auxiliary material, an emission material, an emission auxiliary material, and an electron blocking material. In addition, the electron transport layer, the electron injection layer, the electron buffer layer, and the hole blocking layer can include an azine-based compound as an electron transport material, an electron injection material, an electron buffer material, and a hole blocking material. The organic layer can further include at least one metal selected from the group consisting of a metal of Group 1 of the periodic table, a metal of Group 2, a transition metal of Period 4, a transition metal of Period 5, a lanthanide series element, and an organic metal of d-transition element, or at least one complex compound including the metal.

[0096] The anode and the cathode can each be formed of a transparent conductive material, or a semi-transparent reflective or reflective conductive material. Depending on the material forming the first electrode and the second electrode, the organic electroluminescent device can be a top emission type, a bottom emission type, or a dual emission type.

[0097] A hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof can be used between the anode and the emission layer. The hole injection layer can be a multi-layer in order to lower a hole injection barrier (or a hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, where each of the multi-layer can simultaneously use two compounds. In addition, the hole injection layer can be doped with a p-type dopant. The electron blocking layer can be located between the hole transport layer (or the hole injection layer) and the emission layer, and can prevent light leakage by blocking electrons from overflowing from the emission layer and confining excitons within the emission layer. The hole transport layer or the electron blocking layer can be a multi-layer, where a plurality of compounds can be used in each layer of the multi-layer.

[0098] 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 can be a multi-layer to control the injection of electrons and improve the interface properties between the light-emitting layer and the electron injection layer, where two compounds can be used in each of the multi-layer. The hole blocking layer is located between the electron transport layer (or the electron injection layer) and the light-emitting layer, and can increase the probability of recombination of electrons and holes in the light-emitting layer by preventing holes from reaching the cathode. The hole blocking layer or the electron transport layer can be a multi-layer, where a plurality of compounds can be used in each of the multi-layer. In addition, the electron injection layer can be doped with an n-type dopant.

[0099] A light-emitting auxiliary layer, a hole auxiliary layer, or an electron blocking layer can be provided to improve the efficiency and / or lifetime characteristics of the organic electroluminescent device.

[0100] The light-emitting auxiliary layer can be placed between the anode and the light-emitting layer, or between the cathode and the light-emitting layer. When the light-emitting auxiliary layer is placed between the anode and the light-emitting layer, it can be used to facilitate the injection and / or transport of holes, or to prevent the overflow of electrons. When the light-emitting auxiliary layer is placed between the cathode and the light-emitting layer, it can be used to facilitate the injection and / or transport of electrons, or to prevent the overflow of holes.

[0101] In addition, the hole auxiliary layer can be placed between the hole transport layer (or the hole injection layer) and the light-emitting layer, and can effectively facilitate or limit the hole transport rate (or the hole injection rate), thereby enabling control of the charge balance. When the organic electroluminescent device includes two or more hole transport layers, the further included hole transport layer can function as a hole auxiliary layer or an electron blocking layer.

[0102] In the organic electroluminescent device of the present disclosure, at least one layer selected from the group consisting of a chalcogenide layer, a metal halide layer, and a metal oxide layer (hereinafter referred to as "surface layer") can be placed on the inner surface of one or both electrodes. Specifically, a chalcogenide (including oxide) layer of silicon and aluminum can be placed on the anode surface of the electroluminescent medium layer, and a metal halide layer or a metal oxide layer can be placed on the cathode surface of the electroluminescent medium layer. Such a surface layer provides operational stability to the organic electroluminescent device. For example, the chalcogenide includes SiO X (1≤X≤2), AlO X (1≤X≤1.5), SiON, SiAlON, etc.; the metal halide includes LiF, MgF2, CaF2, rare earth metal fluoride, etc.; and the metal oxide includes Cs2O, Li2O, MgO, SrO, BaO, CaO, etc.

[0103] Further, in the organic electroluminescent device of the present disclosure, a mixed region of an electron transport compound and a reducing dopant, or a mixed region of a hole transport compound and an oxidizing dopant can be placed on at least one surface of a pair of electrodes. In this case, the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region to the light-emitting medium. Further, the hole transport compound is oxidized to a cation, and thus it becomes easier to inject and transport holes from the mixed region to the light-emitting medium. Specifically, the oxidizing dopant includes various Lewis acids and acceptor compounds; and the reducing dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. The reducing dopant layer can be used as a charge generation layer to produce an organic electroluminescent device having two or more light-emitting layers and emitting white light.

[0104] The formation of each layer of the organic electroluminescent device of the present disclosure can be achieved by employing any one of dry film formation methods such as vacuum deposition, sputtering, plasma, ion plating methods, etc., or wet film formation methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, flow coating methods, etc.

[0105] When using a wet film formation method, a thin film can be formed by dissolving or diffusing the material forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent can be any solvent in which the material forming each layer can be dissolved or diffused and is not problematic in terms of film formation ability.

[0106] According to one embodiment of the present disclosure, when a layer of the first host material and the second host material is formed, the layer can be formed by the methods listed above, and generally can be formed by a co-deposition or mixed deposition process. Co-deposition is a method for mixing two or more materials into each individual crucible source and simultaneously applying a current to two cells to evaporate the materials. Mixed deposition is a method for mixing two or more materials in one crucible source before deposition and then applying a current to one cell to evaporate the materials.

[0107] According to one embodiment of the present disclosure, when the first host material and the second host material are present in the same layer or different layers in the organic electroluminescent device, the two host compounds can be formed into films, respectively. For example, the second host material can be deposited after the first host material is deposited.

[0108] The various host materials according to one embodiment of the present disclosure can be used as light-emitting materials for white organic light-emitting devices. White organic light-emitting devices have been proposed to have various structures, such as a side-by-side structure or a stacked structure, depending on the arrangement of R (red), G (green), or YG (yellow-green) and B (blue) light-emitting parts, or a color conversion material (CCM) method, etc. The various host materials according to another embodiment of the present disclosure can also be used in organic electroluminescent devices containing quantum dots (QDs).

[0109] In addition, display systems, such as display systems for smartphones, tablet PCs, notebook computers, PCs, TVs, or cars; or lighting systems, such as outdoor or indoor lighting systems, can be produced by using the various host materials of the present disclosure.

[0110] Hereinafter, a method of preparing the compound according to the present disclosure and properties thereof, and properties of an OLED including the organic electroluminescent compound or the various host materials according to the present disclosure will be explained. However, the following examples are provided only for explaining the characteristics of the OLED including the organic electroluminescent compound or the various host materials according to the present disclosure in order to understand the present disclosure in detail, and the present disclosure is not limited to the following examples.

[0111] Example 1: Preparation of compound H2-36

[0112]

[0113] 1) Synthesis of compound 1-1

[0114] In a flask, 4-bromo-2-chlorophenanthrene (30 g, 103 mmol), 2-bromophenylboronic acid (22.7 g, 113 mmol), Pd(PPh3)4(5.9 g, 5.0 mmol), and K2CO3(27.2 g, 257 mmol) were dissolved in 520 mL of toluene, 130 mL of ethanol, and 130 mL of water, and the mixture was refluxed at 120°C for 4 hours. After completion of the reaction, the organic layer was extracted with ethyl acetate, and the remaining moisture was removed with magnesium sulfate. The residue was dried and then separated using column chromatography to obtain compound 1-1 (37.8 g, yield: 100%).

[0115] 2) Synthesis of compound 1-2

[0116] Compound 1-1 (37.8 g, 102 mmol), Pd(PPh3)2Cl2 (7.2 g, 10 mmol), and DBU (77 mL, 514 mmol) were dissolved in 510 mL of DMF, and the mixture was refluxed at 165°C for 4 hours. After the completion of the reaction, the organic layer was extracted with ethyl acetate, and the remaining moisture was removed with magnesium sulfate. The residue was dried and then separated using column chromatography to obtain compound 1-2 (4 g, yield: 13.5%).

[0117] 3) Synthesis of compound 1-3

[0118] Compound 1-2 (5 g, 17 mmol), 4,4,4',4',5,5,5',5'-octamethyl-2,2'-bi(1,3,2-dioxaborolane) (22 g, 87 mmol), Pd2dba3 (798 mg, 0.8 mmol), SPhos (715 mg, 1.7 mmol), and KOAc (4.3 g, 43 mmol) were dissolved in 113 mL of 1,4-dioxane, and the mixture was refluxed at 100°C for 3 hours. After the completion of the reaction, the organic layer was extracted with ethyl acetate, and the remaining moisture was removed with magnesium sulfate. The residue was dried and then separated using column chromatography to obtain compound 1-3 (7.9 g, yield: 100%).

[0119] 4) Synthesis of compound H2-36

[0120] Compound 1-3 (7.9 g, 21 mmol), 2-chloro-4-(dibenzo[b,d]furan-1-yl)-6-phenyl-1,3,5-triazine (8.5 g, 21 mmol), Pd(PPh3)4 (1.2 g, 1 mmol), and K2CO3 (7.2 g, 52 mmol) were dissolved in 100 mL of toluene, 26 mL of ethanol, and 26 mL of water, and the mixture was stirred at reflux for 4 hours. After the completion of the reaction, the organic layer was extracted with ethyl acetate, and the remaining moisture was removed with magnesium sulfate. The residue was dried and then separated using column chromatography to obtain compound H2-36 (8 g, yield: 61%).

[0121] MW Melting point [CAT g ]]> H2-36 623.72 297.1℃ 131℃

[0122] [Device Example 1] Production of an OLED co-deposited with first and second host compounds according to the present disclosure

[0123] An OLED according to the present disclosure was produced. A transparent electrode indium tin oxide (ITO) thin film (10 Ω / sq) on a glass substrate for an OLED (GEOMATEC CO., LTD.) was subjected to ultrasonic washing with acetone and isopropanol in this order, and then stored in isopropanol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. The compound HI-1 shown in Table 2 was introduced into one chamber of the vacuum vapor deposition apparatus, and the compound HT-1 was introduced into another chamber of the vacuum vapor deposition apparatus. The two materials were evaporated at different rates, and the compound HI-1 was deposited at a doping amount of 3 wt% based on the total amount of the compound HI-1 and the compound HT-1 to form a first hole injection layer having a thickness of 10 nm. The compound HT-1 was then deposited on the hole injection layer to form a first hole transport layer having a thickness of 80 nm. The compound HT-2 was then introduced into another chamber of the vacuum vapor deposition apparatus, and evaporated by applying a current to the chamber, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer. After the formation of 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 chambers of the vacuum vapor deposition apparatus as hosts, and the compound D-39 was introduced into another chamber 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 at a doping amount of 3 wt% based on the total amount of the host and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer. The compound ET-1 and the compound EI-1 were then deposited as electron transport materials at a weight ratio of 50:50 to form an electron transport layer having a thickness of 35 nm on the light-emitting layer. After the compound EI-1 was deposited 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. In this way, an OLED was produced. All the materials used for producing the OLED were purified by vacuum sublimation. -6 The compound was purified by vacuum sublimation.

[0124] Apparatus Example 2: Production of an OLED depositing a host compound according to the present disclosure

[0125] An OLED was produced in the same manner as in Device Example 1, except that the first host compound shown in Table 1 below was used as a single host of the light-emitting layer.

[0126] Comparative Example 1: Production of an OLED containing a comparative compound as a host

[0127] An OLED was produced in the same manner as in Device Example 1, except that the first host compound shown in Table 1 below was used as a host of the light-emitting layer.

[0128] The driving voltage, luminous efficiency, and emission color of the OLEDs produced in Measurement Device Examples 1 and 2 and Comparative Example 1 at a luminance of 1,000 nits, and the time taken for the luminance to decrease from 100% to 95% at a luminance of 10,000 nits (lifetime: T 95 ), and the results thereof are shown in Table 1 below.

[0129] [Table 1]

[0130]

[0131] It can be confirmed from Table 1 above that the OLED using the plurality of host materials including the compound represented by Formula 1 according to the present disclosure and the compound represented by Formula 2 has a lower driving voltage, a higher luminous efficiency, and / or a longer lifetime characteristic compared to the OLED using the compound represented by Formula 2 as a single host and the OLED using the comparative compound as a host material. Meanwhile, it can be confirmed that the OLED using the compound represented by Formula 2 as a single host material has a lower driving voltage, a higher luminous efficiency, and a longer lifetime characteristic compared to the OLED using the comparative compound as a host material.

[0132] [Table 2]

[0133]

Claims

1. An organic electroluminescent compound represented by the following formula 1: In formula 1, R1to R 12 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C 30 )alkyl group, a substituted or unsubstituted (C6-C 30 )aryl group, a substituted or unsubstituted (3- to 30-membered)heteroaryl group, a substituted or unsubstituted (C3-C 30 )cycloalkyl group, a substituted or unsubstituted (C1-C 30 )alkoxy group, a substituted or unsubstituted tri(C1-C 30 )alkylsilyl group, a substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 )arylsilyl group, a substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 )arylsilyl group, a substituted or unsubstituted tri(C6-C 30 )arylsilyl group, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, a substituted or unsubstituted mono- or di(C1-C 30 )alkylamino group, a substituted or unsubstituted mono- or di(C2-C 30 )alkenylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(C2-C 30 )alkenylamino group, a substituted or unsubstituted mono- or di(C6-C 30 )arylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(C6-C 30 )arylamino group, a substituted or unsubstituted mono- or di(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C1-C 30 )alkyl(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C2-C 30 )alkenyl(C6-C 30 )arylamino group, a substituted or unsubstituted (C2-C 30 )alkenyl(3- to 30-membered)heteroarylamino group, a substituted or unsubstituted (C6-C 30 )aryl(3- to 30-membered)heteroarylamino group, or -L1-ETU; provided that at least one of R1to R 12 represents -L1-ETU; each L1independently represents a single bond, substituted or unsubstituted (C6-C30)arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene; and 30 )arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene; and ETUeach independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolyl group, a substituted or unsubstituted quinoxalyl group, a substituted or unsubstituted benzoquinoxalyl group, a substituted or unsubstituted dibenzoquinoxalyl group, a substituted or unsubstituted benzoquinazolyl group, a substituted or unsubstituted dibenzoquinazolyl group, a substituted or unsubstituted benzo-furo-pyrazinyl group, a substituted or unsubstituted benzo-thio-pyrazinyl group, a substituted or unsubstituted benzo-furo-pyrimidinyl group, or a substituted or unsubstituted benzo-thio-pyrimidinyl group.

2. The organic electroluminescence compound according to claim 1, wherein the substituted alkyl group, the substituted aryl group, the substituted arylene group, the substituted heteroaryl group, the substituted heteroarylene group, the substituted cycloalkyl group, the substituted alkoxy group, the substituted trialkylsilyl group, the substituted dialkylarylsilyl group, the substituted alkyldiarylsilyl group, the substituted triarylsilyl group, the substituted condensed ring group of one or more aliphatic rings and one or more aromatic rings, the substituted mono- or dialkylamino group, the substituted mono- or dialkenylamino group, the substituted alkylalkenylamino group, the substituted mono- or diarylamino group, the substituted alkylarylamino group, the substituted mono- or diheteroarylamino group, the substituted alkylheteroarylamino group, the The substituted alkenylarylamino, the substituted alkenylheteroarylamino, the substituted arylheteroarylamino, the substituted pyridyl, the substituted pyrimidyl, the substituted triazinyl, the substituted quinolyl, the substituted quinazolinyl, the substituted quinoxalinyl, the substituted benzoquinoxalinyl, the substituted dibenzoquinoxalinyl, the substituted benzoquinazolinyl, the substituted dibenzoquinazolinyl, the substituted benzofuranopyrazinyl, the substituted benzothiopyrazinyl, the substituted benzofuranopyrimidinyl and the substituted benzothiopyrimidinyl are each independently substituted by at least one selected from the group consisting of: deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; phosphine oxide; (C1-C 30 )alkyl; halo(C1-C 30 )alkyl; (C2-C 30 )alkenyl; (C2-C 30 )alkynyl; (C1-C 30 ) alkoxy; (C1-C 30 )alkylthio; (C3-C 30 )cycloalkyl; (C3-C 30 )cycloalkenyl; (3- to 7-membered)heterocycloalkyl; (C6-C 30 ) aryloxy; (C6-C 30 ) arylthio; unsubstituted or (C1-C 30 )alkyl and (C6-C 30 ) aryl, at least one substituted (3- to 30-membered) heteroaryl; unsubstituted or substituted by deuterium, cyano, halogen, (C1-C 30 )alkyl, (C3-C 30 )cycloalkyl, tri(C1-C 30 )alkylsilyl, tri(C6-C 30 ) arylsilyl, (C6-C 30 ) aryl, and (3- to 30-membered) heteroaryl substituted with at least one of (C6-C 30 )aryl; tri(C1-C 30 )alkylsilyl; tri(C6-Ci8)arylsilyl; 30 )arylcarbonyl; di(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )arylcarbonyl; di(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkyl(C6-Ci8)arylboryl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 30 )alkylcarbonyl; (C1-Ci8)alkoxycarbonyl; 3. The organic electroluminescent compound according to claim 1, wherein R1to R 12 any one of R1to R represents -L1-ETU, and the others represent hydrogen or deuterium.

4. The organic electroluminescent compound according to claim 1, wherein R1to R 12 each independently represents hydrogen, deuterium, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted benzofluorenyl group, a substituted or unsubstituted triphenylenyl group, a substituted or unsubstituted spirobifluorenyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted naphthylidene group, a substituted or unsubstituted benzonaphthofuranyl group, a substituted or unsubstituted benzonaphthothiophenyl group, or -L1-ETU.

5. The organic electroluminescent compound according to claim 1, wherein the compound represented by formula 1 is selected from the following compounds: 6.A plurality of host materials comprising a first host material and a second host material different from the first host material, the first host material comprising the organic electroluminescent compound according to claim 1.

7. The plurality of host materials of claim 6, wherein, the second host material comprises a compound represented by the following formula 2: In formula 2, X1and Y1each independently represent -N=, -NR 19 -, -O- or -S-; with the proviso that either of X1and Y1represents -N=, and the other of X1and Y1represents -NR 19 -, -O- or -S-; R 13 represents substituted or unsubstituted (C6-C 30 )aryl, or substituted or unsubstituted (3- to 30-membered)heteroaryl; R 14 to R 16 and R 19 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C 30 )alkyl group, a substituted or unsubstituted (C6-C 30 )aryl group, a substituted or unsubstituted (3- to 30-membered)heteroaryl group, a substituted or unsubstituted (C3-C 30 )cycloalkyl group, a substituted or unsubstituted (C1-C 30 )alkoxy group, a substituted or unsubstituted tri(C1-C 30 )alkylsilyl group, a substituted or unsubstituted di(C1-C 30 )alkyl(C6-C 30 )arylsilyl group, a substituted or unsubstituted (C1-C 30 )alkyldi(C6-C 30 )arylsilyl group, a substituted or unsubstituted tri(C6-C 30 )arylsilyl group, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, or -L3-N(Ar1)(Ar2); or can be linked to an adjacent substituent to form one or more rings; R 17 and R 18 each independently represents a substituted or unsubstituted (C6-C 30 )aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or -L3-N(Ar1)(Ar2); L2 and L3 each independently represent a single bond, a substituted or unsubstituted (C6-C 30 )arylene, or substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar1and Ar2each independently represent hydrogen, deuterium, a substituted or unsubstituted (Ci-C6)alkyl, a substituted or unsubstituted (C2-C6)alkenyl, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, a substituted or unsubstituted (C6-C 30 )aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and 30 30 Ar1and Ar2each independently represent hydrogen, deuterium, a substituted or unsubstituted (Ci-C6)alkyl, a substituted or unsubstituted (C2-C6)alkenyl, a substituted or unsubstituted fused ring group of one or more (C3-C 30 )aliphatic rings and one or more (C6-C 30 )aromatic rings, a substituted or unsubstituted (C6-C 30 )aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; and b and c each independently represent an integer of 1 or 2, and d represents an integer of 1 to 4, and if b to d represent an integer of 2 or more, each R 14 to each R 16 may be the same as or different from each other.

8. The plurality of host materials of claim 7, wherein, the compound represented by formula 2 is selected from the following compounds: 9.An organic electroluminescent device comprising the organic electroluminescent compound according to claim 1.

10. 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 layer of the light-emitting layer comprises the plurality of host materials according to claim 6.

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