MULTIPLE HOST MATERIALS AND THIS COMPREHENSIVE ORGANIC ELECTROLUMINESCENT DEVICE

Abstract

The present disclosure relates to several host materials and an organic electroluminescent device comprising these materials. By incorporating a specific combination of compounds according to the present disclosure as several host materials, an organic electroluminescent device with improved light yield and / or lifetime characteristics can be provided compared to conventional organic electroluminescent devices.

Description

Technical FieldThe present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same.Prior ArtIn 1987, Tang et al. of Eastman Kodak first developed a small molecular green organic electroluminescent device (OLED) by using a TPD / Alq3 bilayer consisting of a light emitting layer and a charge transport layer. Thereafter, OLEDs were rapidly developed and commercialized. Currently, OLEDs mainly use phosphorescent materials having excellent screen-type luminous efficacy. However, in many applications such as televisions and lighting, the lifetime of OLEDs is insufficient and high efficiency of OLEDs is still required. Typically, the lifetime of an OLED becomes shorter as the luminance of the OLED increases. Therefore, for long-term applications and high display resolution, an OLED with high light efficiency and / or long lifetime is required.Various materials or concepts for an organic layer of an OLED have been proposed to improve the luminous efficiency, driving voltage and / or lifetime. However, these were unsatisfactory in practical use. There is also a need to develop an organic electroluminescent material with further improved performance, for example, improved driving voltage, light yield, power efficiency and / or lifetime properties compared to a combination of specific compounds disclosed above.Meanwhile, Korean Patent Application Laid-Open No. 2020-0014189 discloses a compound having an fused structure comprising benzocarbazole and azoles and a compound having a fused structure comprising indolocarbazole and azepin as a host material. However, in the above-mentioned literature, a plurality of host materials comprising a specific combination of compounds according to the present disclosure are not specifically disclosed.Disclosure of the InventionTechnical TaskThe object of the present disclosure is firstly to provide a plurality of host materials with which an organic electroluminescent device having low driving voltage and / or high luminous efficiency and / or excellent lifetime properties can be provided, and secondly to provide an organic electroluminescent device comprising the host materials.Solution of the ProblemAs a result of intensive studies to solve the technical problems, it has been found in the present invention that the above object can be achieved by a plurality of host materials comprising a first host material comprising a compound represented by the following formula 1 and a second host material comprising a compound represented by the following formula 2. wherein in formula 1, L 1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene or a substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar 1 is hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, -N-(L 2- Ar 2)( L 3- Ar 3), a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl; L 2 and L 3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar 2 and Ar 3 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; is represented by the following formula 1-1 or 1-2; wherein, in the formulae 1-1 and 1-2, X 1 to X 25 each independently represent N or CR a ; R a each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)-alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to one or more rings; * represents a site linked to L 1 ; wherein in formula 2, X represents O or S; L 4 and L 5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar 4 and Ar 5 each independently represent a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; R 1 and R 2 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a 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 when a and b each represent an integer having a value of 2 or more, each of R 1 and each of R 2 may be the same or different from each other.Advantageous Effects of the InventionBy using the plurality of host materials of the present disclosure, an organic electroluminescent device having low driving voltage, high luminous efficiency, and / or excellent durability properties can be produced.Embodiment of the InventionHereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the present disclosure and not to limit the scope of the present disclosure in any way.The term "organic electroluminescent compound" in the present disclosure means a compound that can be used in an organic electroluminescent device and can be contained in any layer constituting an organic electroluminescent device as needed.The term "organic electroluminescent compound" in the present disclosure means a compound that can be used in an organic electroluminescent device and can include at least one compound. The organic electroluminescent material may be contained in any layer constituting an organic electroluminescent device as needed. For example, the organic electroluminescent material may be a hole injection material, a hole transport material, a hole assist material, a light emitting assist material, an electron blocking material, a light emitting material (containing a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc.The term "multiple host materials" in the present disclosure means a host material comprising a combination of at least two compounds that may be contained in any light emitting layer constituting an organic electroluminescent device. It may mean both a material before inclusion in an organic electroluminescent device (e.g., before vapor deposition) and a material after inclusion in an organic electroluminescent device (e.g., after vapor deposition). For example, the plurality of host materials of the present disclosure is a combination of at least two host materials, and optionally, conventional materials incorporated into an organic electroluminescent material may be further included. At least two compounds contained in the plurality of host materials of the present disclosure may be contained together in one light emitting layer or respectively contained in different light emitting layers. For example, the at least two host materials may be evaporated as a mixture or co-evaporated or individually evaporated.The term "(C1-C30)alkyl" as used herein means a linear or branched alkyl having 1 to 30 carbon atoms constituting a chain, the number of carbon atoms being preferably 1 to 10, and more preferably 1 to 6. The above alkyl may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc.The term "(C3-C30)cycloalkyl" as used herein means a mono- or polycyclic hydrocarbon having 3 to 30 ring skeleton carbon atoms, the number of carbon atoms preferably being 3 to 20 and more preferably 3 to 7. The above cycloalkyl may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclohexylmethyl, etc.The term "(3- to 7-membered)heterocycloalkyl" as used herein means a cycloalkyl having 3 to 7 ring framework atoms and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si and P, preferably selected from the group consisting of O, S and N. The above heterocycloalkyl may include tetrahydrofuran, pyrrolidine, thiolane, tetrahydropyran, etc.The terms "(C6-C30)aryl" and "(C6-C30)arylene" as used herein mean a monocyclic or fused ring radical derived from an aromatic hydrocarbon having from 6 to 30 ring backbone carbon atoms. The above aryl and arylene may be partially saturated. The above aryl may comprise a spiro structure. The above aryl may include phenyl, biphenyl, terphenyl, quinquephenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenyl fluorenyl, diphenyl fluorenyl, benzo fluorenyl, dibenzo fluorenyl, phenanthrenyl, phenylphenanthrenyl, benzophenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, peryleneyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, spiro[fluorene-benzofluorene]yl, spiro[cyclopentene-fluorene]yl, spiro[dihydroindene-fluorene]yl, azulenyl, tetramethyldihydrophenanthrenyl, etc. Specifically, the above aryl may be phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthacenyl, pyrenyl, 1-chrysenyl, 2-chrysenyl, 3-chrysenyl, 4-chrysenyl, 5-chrysenyl, 6-chrysenyl, Benzo[c]phenanthryl Benzo[g]chrysenyl 1-triphenylenyl, 2-triphenylenyl, 3-triphenylenyl, 4-triphenylenyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, 9-fluorenyl, 9-fluorenyl, Benzo[a] fluorenyl, benzo[b] fluorenyl, benzo[c] fluorenyl, dibenzo fluorenyl, 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, mesityl, o-cumenyl, m-cumenyl, p-cumenyl, p-tert-butylphenyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, 9,9-dimethyl-1-fluorenyl, 9,9-dimethyl-2-fluorenyl, 9,9-dimethyl-3-fluorenyl, 9,9-dimethyl-4-fluorenyl, 9,9-diphenyl-1-fluorenyl, 9,9-diphenyl-2-fluorenyl, 9,9-diphenyl-3-fluorenyl, 9,9-diphenyl-4-fluorenyl, 11,11-dimethyl-1-benzo[a] fluorenyl, 11,11-dimethyl-2-benzo[a] fluorenyl, 11,11-dimethyl-3-benzo[a] fluorenyl, 11,11-dimethyl-4-benzo[a] fluorenyl, 11,11-dimethyl-5-benzo[a] fluorenyl, 11,11-dimethyl-6-benzo[a] fluorenyl, 11,11-Dimethyl-7-benzo[a] fluorenyl, 11,11-dimethyl-8-benzo[a] fluorenyl, 11,11-dimethyl-9-benzo[a] fluorenyl, 11,11-dimethyl-10-benzo[a] fluorenyl, 11,11-dimethyl-1-benzo[b] fluorenyl, 11,11-dimethyl-2-benzo[b] fluorenyl, 11,11-dimethyl-3-benzo[b] fluorenyl, 11,11-dimethyl-4-benzo[b] fluorenyl, 11,11-dimethyl-5-benzo[b] fluorenyl, 11,11-dimethyl-6-benzo[b] fluorenyl, 11,11-dimethyl-7-benzo[b] fluorenyl, 11,11-dimethyl-8-benzo[b] fluorenyl, 11,11-dimethyl-9-benzo[b] fluorenyl, 11,11-dimethyl-10-benzo[b] fluorenyl, 11,11-dimethyl-10-benzo[b] fluorenyl, 11,11-Dimethyl-1-benzo[c] fluorenyl, 11,11-dimethyl-2-benzo[c] fluorenyl, 11,11-dimethyl-3-benzo[c] fluorenyl, 11,11-dimethyl-4-benzo[c] fluorenyl, 11,11-dimethyl-5-benzo[c] fluorenyl, 11,11-dimethyl-6-benzo[c] fluorenyl, 11,11-dimethyl-7-benzo[c] fluorenyl, 11,11-dimethyl-8-benzo[c] fluorenyl, 11,11-dimethyl-9-benzo[c] fluorenyl, 11,11-dimethyl-10-benzo[c] fluorenyl, 11,11-diphenyl-1-benzo[a] fluorenyl, 11,11-diphenyl-2-benzo[a] fluorenyl, 11,11-diphenyl-3-benzo[a] fluorenyl, 11,11-diphenyl-4-benzo[a] fluorenyl, 11,11-Diphenyl-5-benzo[a] fluorenyl, 11,11-diphenyl-6-benzo[a] fluorenyl, 11,11-diphenyl-7-benzo[a] fluorenyl, 11,11-diphenyl-8-benzo[a] fluorenyl, 11,11-diphenyl-9-benzo[a] fluorenyl, 11,11-diphenyl-10-benzo[a] fluorenyl, 11,11-diphenyl-1-benzo[b] fluorenyl, 11,11-diphenyl-2-benzo[b] fluorenyl, 11,11-diphenyl-3-benzo[b] fluorenyl, 11,11-diphenyl-4-benzo[b] fluorenyl, 11,11-diphenyl-5-benzo[b] fluorenyl, 11,11-diphenyl-6-benzo[b] fluorenyl, 11,11-diphenyl-7-benzo[b] fluorenyl, 11,11-diphenyl-8-benzo[b] fluorenyl, 11,11-diphenyl-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, 9,10,10-tetramethyl-9,10-dihydro-1-phenanthrenyl, 9,9,10,10-tetramethyl-9,1-0-dihydro-2-phenanthrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-3-phenanthrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-4-phenanthrenyl, etc.The term "(3- to 30-membered)heteroaryl" or,,(3- to 30-membered)heteroarylene" as used herein means an aryl group having 3 to 30 ring skeleton atoms and 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 may be a monocyclic ring or a fused ring fused to at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via one or more single bonds; and may comprise a spiro structure. The above heteroaryl may be a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrzinyl, triazolyl, tetrazolyl, frazanyl, pyridyl, pyrazinyl, pyrimidinyl and pyridazinyl, and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, dibenzoselenophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, naphthooxazolyl, benzofuroquinolinyl, benzofuroquinazolinyl, Benzofuronaphthyridinyl, Benzofuropyrimidinyl, naphthofuropyrimidinyl, benzothienochlorinoyl, benzothienoquinazolinyl, naphthyridinyl, Benzothienonaphthyridinyl benzothienopyrimidinyl, naphthothienopyrimidinyl, pyrimidoindolyl, benzopyrimidoindolyl, benzofuropyrazinyl, naphthofuropyrazinyl, benzothienopyrazinyl, naphthothienopyrazinyl, pyrazinoindolyl, benzopyrazinoindolyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, The amino acid groups may include quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalineyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenanthridinyl, benzodioxolyl, dihydroacridinyl, benzotriazolyl, phenazinyl, imidazopyridyl, chromenoquinazolinyl, thiochromenoquinazolinyl, dimethylbenzopyrimidinyl, indolocarbazolyl, indenocarbazolyl, etc. More specifically, the above heteroaryl may be 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazin-4-yl, 1,2,4-triazin-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5-indolidinyl, 6-indolidinyl, 7-indolidinyl, 8-indolidinyl, 2-imidazopyridyl, 3-imidazopyridyl, 5-imidazopyridyl, 6-imidazopyridyl, 7-imidazopyridyl, 8-imidazopyridyl, 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-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, aza carbazol-1-yl, aza carbazol-2-yl, aza carbazol-3-yl, aza carbazol-4-yl, aza carbazol-5-yl, aza carbazol-6-yl, aza carbazol-7-yl, aza carbazol-8-yl, aza carbazol-9-yl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-Phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinium, 2-acridinium, 3-acridinium, 4-acridinium, 9-acridinium, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 3-frazanyl, 2-thienyl, 3-thienyl, 2-methylpyrrol-1-yl, 2-methylpyrrol-3-yl, 2-methylpyrrol-4-yl, 2-methylpyrrol-5-yl, 2-methylpyrrol-3-yl, 2-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-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho[1,2-b]benzofuranyl, 2-naphtho[1,2-b]benzofuranyl, 3-naphtho[1,2-b]benzofuranyl, 4-naphtho[1,2-b]benzofuranyl, 5-Naphtho[1,2-b]-benzofuranyl, 6-naphtho[1,2-b]-benzofuranyl, 7-naphtho[1,2-b]-benzofuranyl, 8-naphtho[1,2-b]-benzofuranyl, 9-naphtho[1,2-b]-benzofuranyl, 10-naphtho[1,2-b]-benzofuranyl, 1-naphtho[2,3-b]-benzofuranyl, 2-naphtho[2,3-b]-benzofuranyl, 3-naphtho[2,3-b]-benzofuranyl, 4-naphtho[2,3-b]-benzofuranyl, 5-naphtho[2,3-b]-benzofuranyl, 6-naphtho[2,3-b]-benzofuranyl, 7-naphtho[2,3-b]-benzofuranyl, 8-naphtho[2,3-b]-benzofuranyl, 9-naphtho[2,3-b]-benzofuranyl, 10-Naphtho[2,3-b]-benzofuranyl, 1-naphtho[2,1-b]-benzofuranyl, 2-naphtho[2,1-b]-benzofuranyl, 3-naphtho[2,1-b]-benzofuranyl, 4-naphtho[2,1-b]-benzofuranyl, 5-naphtho[2,1-b]-benzofuranyl, 6-naphtho[2,1-b]-benzofuranyl, 7-naphtho[2,1-b]-benzofuranyl, 8-naphtho[2,1-b]-benzofuranyl, 9-naphtho[2,1-b]-benzofuranyl, 10-naphtho[2,1-b]-benzofuranyl, 1-naphtho[1,2-b]-benzothiophenyl, 2-naphtho[1,2-b]-benzothiophenyl, 3-naphtho[1,2-b]-benzothiophenyl, 4-naphtho[1,2-b]-benzothiophenyl, 5-Naphtho[1,2-b]-benzothiophenyl, 6-naphtho[1,2-b]-benzothiophenyl, 7-naphtho[1,2-b]-benzothiophenyl, 8-naphtho[1,2-b]-benzothiophenyl, 9-naphtho[1,2-b]-benzothiophenyl, 10-naphtho[1,2-b]-benzothiophenyl, 1-naphtho[2,3-b]-benzothiophenyl, 2-naphtho[2,3-b]-benzothiophenyl, 3-naphtho[2,3-b]-benzothiophenyl, 4-naphtho[2,3-b]-benzothiophenyl, 5-naphtho[2,3-b]-benzothiophenyl, 1-naphtho[2,1-b]-benzothiophenyl, 2-naphtho[2,1-b]-benzothiophenyl, 3-naphtho[2,1-b]-benzothiophenyl, 4-naphtho[2,1-b]-benzothiophenyl, 5-Naphtho-[2,1-b]-benzothiophenyl, 6-naphtho-[2,1-b]-benzothiophenyl, 7-naphtho-[2,1-b]-benzothiophenyl, 8-naphtho-[2,1-b]-benzothiophenyl, 9-naphtho-[2,1-b]-benzothiophenyl, 10-naphtho-[2,1-b]-benzothiophenyl, 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-benzothio[3,2-d]pyrimidinyl, 6-benzothio[3,2-d]pyrimidinyl, 7-benzothio[3,2-d]pyrimidinyl, 8-benzothio[3,2-d]pyrimidinyl, 9-Benzothio[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-benzothio[3,2-d]pyrazinyl, 6-benzothio[3,2-d]pyrazinyl, 7-benzothio[3,2-d]pyrazinyl, 8-benzothio[3,2-d]pyrazinyl, 9-benzothio[3,2-d]pyrazinyl, 1-silafluorenyl, 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germafluorenyl, 2-germafluorenyl, 3-germafluorenyl, 4-Germafluorenyl, 1-dibenzoselenophenyl, 2-dibenzoselenophenyl, 3-dibenzoselenophenyl, 4-dibenzoselenophenyl, etc. Furthermore, the term "halogen" includes F, Cl, Br and I.In addition, "ortho(o-)", "meta(m-)", and "para(p-)" are prefixes each representing the relative positions of substituents. Ortho indicates that two substituents are adjacent to each other, and for example, when two substituents in a benzene derivative occupy positions 1 and 2 or positions 2 and 3, this is referred to as an ortho position. Meta indicates that two substituents are at positions 1 and 3, and for example, when two substituents in a benzene derivative occupy positions 1 and 3, this is referred to as the meta position. Para indicates that two substituents are at positions 1 and 4, and for example, when two substituents in a benzene derivative occupy positions 1 and 4, this is referred to as the para position.Here, "substituted" in the term "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, and also includes cases where the hydrogen atom is replaced with a group formed by a linkage of two or more substituents of the above substituents. For example, the "group formed by a linkage of two or more substituents" may be pyridine-triazine. That is, pyridine-triazine can be construed as a heteroaryl substituent or substituents in which two heteroaryl substituents are linked. The substituent or substituents here are the substituted (C1-C30)alkyl, the substituted (C6-C30)aryl(s), the substituted (3- to 7-membered)heteroaryl(s), the substituted (C3-C30)cycloalkyl, the substituted (C3-C30)cycloalkenyl, the substituted (3- to 7-membered)heterocycloalkyl, the substituted (C1-C30)alkoxy, the substituted tri(C1-C30)alkylsilyl, the substituted di(C1-C30)alkyl(C6-C30)arylsilyl, the substituted (C1-C30)alkyldi(C6-C30)arylsilyl, the substituted tri(C6-C30)arylsilyl, the substituted mono- or di(C1-C30)alkylaminos, the substituted mono- or di(C6-C30)arylaminos and the substituted (C1-C30)alkyl(C6-C30)arylaminos are each independently at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; a (C1-C30)alkyl; a halogen(C1-C30)alkyl; a (C2-C30)alkenyl; a (C2-C30)alkynyl; a (C1-C30)alkoxy; a (C1-C30)alkylthio; a (C3-C30)cycloalkyl; a (C3-C30)cycloalkenyl; a (3- to 7-membered)heterocycloalkyl; a (C6-C30)aryloxy; a (C6-C30)arylthio; a (5- to 30-membered)heteroaryl unsubstituted or substituted by (C6-C30)aryl; a (C6-C30)aryl unsubstituted or substituted by (5- to 30-membered)heteroaryl; a tri-(C1-C30)alkylsilyl; a tri-(C6-C30)arylsilyl; a di-(C1-C30)alkyl-(C6-C30)arylsilyl; a (C1-C30)alkyldi-(C6-C30)arylsilyl; an amino; a mono- or di-(C1-C30)-alkylamino; a mono- or di-(C6-C30)-arylamino which is unsubstituted or substituted by (C1-C30)-alkyl; a (C1-C30)-alkyl-(C6-C30)-arylamino; a (C1-C30)-alkylcarbonyl; a (C1-C30)-alkoxycarbonyl; a (C6-C30)-arylcarbonyl; a di-(C6-C30)-arylborononyl; a di-(C1-C30)-alkylborononyl; a (C1-C30)-alkyl-(C6-C30)-arylborononyl; a (C6-C30)aryl-(C1-C30)alkyl and (C1-C30)alkyl-(C6-C30)aryl. For example, the substituent or substituents may each independently be at least one selected from the group consisting of a carbazolyl, a phenyl unsubstituted or substituted by naphthyl, a biphenyl, a naphthyl, a dibenzofuranyl, a phenanthrenyl, a benzocarbazolyl, dimethyl fluorenyl, or a naphthyl unsubstituted or substituted by phenyl.In the formulae of the present disclosure, when a ring is formed by a linkage of adjacent substituents, the ring may be a substituted or unsubstituted, mono- or polycyclic, (3- to 30-membered) alicyclic or aromatic ring, or the combination thereof formed by linkage of at least two adjacent substituents. In addition, the ring formed 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 framework atoms is 5 to 20, and according to another embodiment of the present disclosure, the number of ring framework atoms is 5 to 15.In the formulae of the present disclosure, the heteroaryl or heteroarylene may each independently comprise 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, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)alkyl-(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi-(C6-C30)arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino and a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino.Several host materials are described in more detail below.A 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. The plurality of host materials may be contained in a light emitting layer of an organic electroluminescent device, according to an example.The first host material according to an embodiment of the present disclosure may be represented by the following formula 1. wherein, in formula 1, L 1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene. According to one embodiment of the present disclosure, L 1 may represent a single bond, a substituted or unsubstituted (C6-C25)arylene or a substituted or unsubstituted (5- to 25-membered)heteroarylene, preferably a single bond, a substituted or unsubstituted (C6-C18)arylene or a substituted or unsubstituted (5- to 18-membered)heteroarylene, more preferably a single bond, a substituted or unsubstituted phenylene, a substituted or unsubstituted biphenylene, a substituted or unsubstituted naphthylene, a substituted or unsubstituted phenanthrenylene, a substituted or unsubstituted dibenzofuranylene, a substituted or unsubstituted carbazolylene or a substituted or unsubstituted benzocarbazolylene. For example, L 1 may represent a single bond, a carbazolylene unsubstituted or substituted by a phenyl or deuterium, a dibenzofuranylene, a naphthylene, a phenylene unsubstituted or substituted by a carbazolyl or deuterium, a biphenylene, a phenanthrenylene, or a benzocarbazolylene.Ar 1 represents hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, -N-(L 2- Ar 2)( L 3- Ar 3), a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to an embodiment of the present disclosure, Ar 1 may be hydrogen, deuterium, a substituted or unsubstituted (C1-C25)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C25)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, -N-(L 2- Ar 2)( L 3- Ar 3), a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl, preferably hydrogen, a substituted or unsubstituted carbazolyl, a substituted or unsubstituted phenyl, a substituted or unsubstituted terphenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, a substituted or unsubstituted benzocarbazolyl, a substituted or unsubstituted dimethyl fluorenyl, a substituted or unsubstituted diphenylamino, a substituted or unsubstituted phenyldibenzofuranylamino or -N-(L 2- Ar 2)( L 3- Ar 3). For example, Ar may be 1 hydrogen; deuterium; a carbazolyl unsubstituted or substituted by a phenyl, a naphthyl or biphenyl; a phenyl unsubstituted or substituted by deuterium, a dibenzofuranyl, a phenanthrenyl, a naphthyl, a biphenyl, a benzocarbazolyl or a dimethyl fluorenyl; a terphenyl; a biphenyl unsubstituted or substituted by a phenyl or deuterium; a phenanthrenyl unsubstituted or substituted by a phenyl; a naphthyl unsubstituted or substituted by a phenyl; a dibenzofuranyl unsubstituted or substituted by a phenyl, a biphenyl or deuterium; a dibenzothiophenyl; a benzocarbazolyl substituted by a phenyl; a dimethyl fluorenyl; a dimethylbenzofluorenyl; a spirobifluorenyl; a dibenzoselenophenyl; a phenyl carbazolylamino; a diphenylamino or -N-(L 2- Ar 2)( L 3- Ar 3).L 2 and L 3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene or a substituted or unsubstituted (3-30 membered)heteroarylene. According to an embodiment of the present disclosure, L 2 to L 3 may each independently represent a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (6- to 25-membered)heteroarylene, preferably a single bond, a substituted or unsubstituted (C6-C18)arylene, or a substituted or unsubstituted (6- to 18-membered)heteroarylene. For example, L 2 and L 3 may each independently represent a single bond, a phenylene, or a carbazolylene unsubstituted or substituted by deuterium.Ar 2 and Ar 3 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to an embodiment of the present disclosure, Ar 2 and Ar 3 may each independently represent a substituted or unsubstituted (C1-C25)alkyl, a substituted or unsubstituted (C3-C25)cycloalkyl, a substituted or unsubstituted (C3-C25)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C25)aryl or a substituted or unsubstituted (3- to 25-membered)heteroaryl, preferably a substituted or unsubstituted (C3-C18)alkyl, a substituted or unsubstituted (C6-C18)cycloalkyl, a substituted or unsubstituted (C6-C18)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C18)aryl or a substituted or unsubstituted (3- to18-membered)heteroaryl, more preferably a substituted or unsubstituted phenyl, a substituted or unsubstituted carbazolyl, dibenzofuranyl or dibenzothiophenyl. For example, Ar 2 and Ar 3 may each independently represent a phenyl unsubstituted or substituted by deuterium, a dibenzofuranyl, or a carbazolyl; a carbazolyl unsubstituted or substituted by deuterium, a phenyl, a biphenyl, or a naphthyl; a dibenzofuranyl unsubstituted or substituted by deuterium; or a dibenzothiophenyl. may be represented by the following formula 1-1 or formula 1-2. wherein in formulae 1-1 and 1-2, X 1 to X 25 each independently represent N or CR a. R a is each independently hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)alkyl-(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi-(C6-C30)arylsilyl, a substituted or unsubstituted tri-(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino or a substituted or unsubstituted (C1-C30)alkyl-(C6-C30)arylamino or may be linked to one or more adjacent substituents to one or more rings. For example, R a may be hydrogen, deuterium, a substituted or unsubstituted phenyl, or may be linked to one or more adjacent substituents to one or more substituted or unsubstituted aromatic rings.According to an embodiment of the present disclosure, X 1, X 2, X 10, X 13 and X 15 to X 18 may each independently represent CR a and here, R a may be hydrogen or deuterium or may be linked to one or more adjacent substituents to one or more benzene rings. * represents a site linked to L 1.According to an embodiment of the present disclosure, Formula 1 may be represented by the following Formula 1-1-1. wherein, in Formula 1-1-1, R 41 to R 43 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to one or more rings. For example, R 41 to R 43 may each independently represent hydrogen, deuterium, or a substituted or unsubstituted phenyl, or may be linked to each other to one or more substituted or unsubstituted aromatic rings. bamay represent an integer of 1 to 3, bbmay represent an integer of 1 to 4, bcmay represent an integer of 1 to 5, and when ba, bb, and bceach represent an integer having a value of 2 or more, each of R 41, each of R 42 and each of R 43 may be the same or different from each other.According to an embodiment of the present disclosure, Formula 1-2 may be represented by the following Formula 1-2-1. wherein, in Formula 1-2-1, R 31 to R 34 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to one or more rings. For example, R 31 to R 34 may each independently represent hydrogen, deuterium, or a substituted or unsubstituted phenyl, or may be linked to one or more substituted or unsubstituted aromatic rings. aamay represent an integer of 1 to 3, ab, and acmay each independently represent an integer of 1 to 4, admay represent an integer of 1 or 2, and when aa, ab, ac, and adeach represent an integer of 2 or more, each of R 31, each of R 32, each of R 33 and each of R 34 may be the same or different from each other.According to an embodiment of the present invention, at least one of Ar 2 and Ar 3 in the formula 1 may be represented by any one of the following formulae 1-3-1 to 1-3-4. wherein in formulae 1-3-1 to 1-3-4 T is O, S, CR 5 R 6, NR 7 or Se. R 3 to R 7 have the same definition as R a, c represents an integer of 1 to 4, d represents an integer of 1 to 3, and when c and d each represent an integer having a value of 2 or more, each of R 3 and each of R 4 may be the same or different from each other.For example, T may be O, S, CR 5 R 6, NR 7 or Se, in which case R 5 to R 7 may each independently be a methyl, a phenyl, a biphenyl or a naphthyl.As another host material according to an embodiment of the present disclosure, the second host compound is represented by the following formula 2. wherein in formula 2, X represents O or S. L 4 and L 5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene or a substituted or unsubstituted (3-30 membered)heteroarylene. According to an embodiment of the present disclosure, L 4 and L 5 each independently represent a single bond, a substituted or unsubstituted (C6-C25)arylene or a substituted or unsubstituted (3- to 25-membered)heteroarylene, preferably a single bond, a substituted or unsubstituted phenylene, a substituted or unsubstituted biphenylene, a substituted or unsubstituted terphenylene, a substituted or unsubstituted phenanthrenylene, a substituted or unsubstituted naphthylene or a substituted or unsubstituted dibenzofuranylene. For example, L 4 and L 5 may each independently represent a single bond, a phenylene unsubstituted or substituted by one or more naphthyl, a biphenylene, a terphenylene, a phenanthrenylene, a dibenzofuranylene unsubstituted or substituted by one or more phenyl or one or more naphthyl, a naphthylene unsubstituted or substituted by one or more phenyl, a phenanthro[3,4-d]oxazolyl, a phenanthro[4,3-d]oxazolyl, or a phenanthro[3,4-d]thiazolyl.Ar 4 and Ar 5 each independently represent a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl. According to an embodiment of the present disclosure, Ar 4 and Ar 5 may each independently represent a substituted or unsubstituted (C6-C25)aryl, preferably a substituted or unsubstituted phenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted terphenyl, a substituted or unsubstituted quaterphenyl, a substituted or unsubstituted benzophenanthrenyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted fluoranthrenyl, or a substituted or unsubstituted triphenylenyl. For example, Ar 4 and Ar 5 may each independently represent a phenyl unsubstituted or substituted by one or more naphthyl, one or more phenanthrenyl, one or more biphenyl, one or more terphenyl, or one or more naphthyl substituted by one or more phenyl; a biphenyl unsubstituted or substituted by one or more phenyl or one or more biphenyl; a terphenyl unsubstituted or substituted by one or more phenyl; a quaterphenyl; a benzophenanthrenyl; a dibenzofuranyl which is unsubstituted or substituted by one or more phenyl, one or more biphenyl, one or more naphthyl which is unsubstituted or substituted by one or more phenyl, one or more naphthyl, one or more phenyl which are substituted by one or more naphthyl, or one or more phenanthrenyl; a naphthyl which is unsubstituted or substituted by one or more phenyl, one or more biphenyl, one or more naphthyl; a phenanthrenyl which is unsubstituted or substituted by one or more phenyl, one or more biphenyl, one or more naphthyl; a fluoranthrenyl; a triphenylenyl; a phenanthro[3,4-d]oxazolyl which is substituted by one or more phenyl; a phenanthro[4,3-d]oxazolyl which is substituted by one or more phenyl; or a phenanthro[3,4-d]thiazolyl substituted by one or more phenyl.R 1 and R 2 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl or -SiR 11 R 12 R 13. According to an embodiment of the present disclosure, R 1 and R 2 may each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C25)alkyl, a substituted or unsubstituted (C6-C25)aryl, a substituted or unsubstituted (3- to 25-membered)heteroaryl, preferably hydrogen, a substituted or unsubstituted phenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted naphthyl, or a substituted or unsubstituted phenanthrenyl. For example, R 1 and R 2 may each independently represent hydrogen, a phenyl unsubstituted or substituted by one or more naphthyl, a biphenyl, a naphthyl unsubstituted or substituted by one or more phenyl or one or more phenanthrenyl.a is an integer of 1 to 4, b is an integer of 1 to 3, and when a and b are each an integer having a value of 2 or more, each of R 1 and each of R 2 may be the same or different from each other.According to an embodiment of the present invention, formula 2 may be represented by any one of the following formulae 2-1 to 2-4: wherein in the formulae 2-1 to 2-4X, R 1, R 2, L 4, L 5, Ar 4, Ar 5, a and b have the same definitions as in formula 2.According to an 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. In the above compounds, Dn means that n hydrogen atoms are replaced with deuterium.According to an 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. The combination of at least one of the compounds H1-1 to H1-151 and at least one of the compounds C-1 to C-397 can be used in an organic electroluminescent device.The compound represented by Formula 1 according to 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 Feb. 23, 2018), and the compound represented by Formula 1-2 can be synthesized by referring to the method disclosed in Korean Patent Application Laid-Open No. 2018-0012709 (published on Feb. 6, 2018), but these are not limited thereto and can also be prepared by other synthetic methods known to those skilled in the art.The compound represented by formula 2 can be prepared by a synthetic method known to those skilled in the art, for example, it can be prepared by referring to the following Reaction Scheme 1, but is not limited thereto. In Reaction Scheme 1, X, R 1, R 2, L 4, L 5, Ar 4, Ar 5, a and b have the same definitions as in Formula 2, and Hal represents halogen.Although illustrative synthesis examples of the compound represented by formulae 1 and 2 are described above, it is readily apparent to those skilled in the art that they are all based on a Buchwald-Hartwig cross-coupling reaction, an N-arylation reaction, an H-Mont-mediated etherification reaction, a Miyaura borylation reaction, a Suzuki cross-coupling reaction, an intramolecular acid-induced cyclization reaction, a Pd(II)-catalyzed oxidative cyclization reaction, a Grignard reaction, a Heck reaction, a cyclodehydration reaction, an SN 1- substitution reaction, an SN 2- substitution reaction, a phosphine-mediated reductive cyclization reaction, etc., and the above reaction proceeds even when substituents, which are defined in the formulae 1 and 2 but are not shown in the specific synthesis example.Hereinafter, an organic electroluminescent device using the above-described plurality of host materials will be described in more detail.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 at least one light emitting layer comprises the 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 respectively contained in different light emitting layers among a plurality of light emitting layers. The plurality of host materials of the present invention may comprise the compound represented by Formula 1 and the 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 may be combined in a desired ratio by mixing them in a shaker, dissolving them in a glass tube by heat, or dissolving them in a solvent, etc.According to an embodiment of the present disclosure, the doping concentration of the dopant compound may be less than 20 wt % with respect to the host compound of the light emitting layer. The dopant contained in the organic electroluminescent device of the present disclosure may be at least one phosphorescent or fluorescent dopant, and is preferably a phosphorescent dopant. The phosphorescent dopant materials applied to the organic electroluminescent device of the present disclosure are not particularly limited, but may be a metallated complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and preferably an orthometallated complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and more preferably an orthometallated iridium complex compound.The dopant contained in the organic electroluminescent device of the present disclosure may be, but is not limited to, a compound represented by the following formula 101. wherein in formula 101, L' is selected from any one of the following structures 1 to 3, R 100 to R 103 each independently represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl which is unsubstituted or substituted by deuterium and / or one or more halogens, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a cyano, a substituted or unsubstituted (3- to 30-membered)heteroaryl or a substituted or unsubstituted (C1-C30)alkoxy or are substituted by an adjacent substituent to one or more rings, e.g. a substituted or unsubstituted quinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline or indenoquinoline, may be linked together with pyridine;R 104 to R 107 each independently represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl which is unsubstituted or substituted by deuterium and / or one or more halogens, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a cyano or a substituted or unsubstituted (C1-C30)alkoxy or are substituted by an adjacent substituent to one or more substituted or unsubstituted rings, e.g. a substituted or unsubstituted naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine or benzothienopyridine, may be linked together with benzene;R 201 to R 220 each independently represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl which is unsubstituted or substituted by deuterium and / or one or more halogens, a substituted or unsubstituted (C3-C30)cycloalkyl or a substituted or unsubstituted (C6-C30)aryl or may be linked to an adjacent substituent to one or more substituted or unsubstituted rings; and s represents an integer from 1 to 3.The specific examples of the dopant compound are as follows, but are not limited thereto. 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 of the following: a hole injection layer, a hole transport layer, a hole auxiliary layer, an auxiliary light emitting 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 the layers may also be in the form of a plurality of layers.The anode and the cathode may each be formed of a transparent conductive material or a transflective or reflective conductive material. Depending on the type of material from which the anode and the cathode are formed, the organic electroluminescent device may be of the top light emission type, the bottom light emission type, or the double side light emission type. In addition, the hole injection layer may be further doped with one or more p-type dopants and the electron injection layer may be further doped with one or more n-type dopants.The organic layer may further contain at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds. In addition, the organic material layer may further include at least one metal selected from the group consisting of Group 1 metals, Group 2 metals, 4th period transition metals, 5th period transition metals, lanthanides, and organic metals of the d-transition elements of the periodic table, or at least one complex compound including the metal.In addition, the organic electroluminescent device of the present disclosure can thereby, but besides the compound of the present disclosure, further emit at least one light emitting layer comprising a blue, red or green light emitting compound known in the art, emit white light. In addition, it may optionally further comprise a yellow or orange light-emitting layer.In the organic electroluminescent device of the present disclosure, preferably, 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 disposed on at least inner surfaces of a pair of electrodes. Specifically, a layer of chalcogenides (including an oxide) of silicon and aluminum is preferably disposed on an anode surface of one side of the layer of electroluminescent medium, and a metal halide layer or a metal oxide layer is preferably disposed on a cathode surface of one side of the layer of electroluminescent medium. By the surface layer, driving stabilization of the organic electroluminescent device can be obtained. Preferable examples of the chalcogenide include SiOx(1≤X≤2), AlOx(1≤X≤1.5), SiON, SiAlON, etc.; preferable examples of the metal halide include LiF, MgF 2, CaF 2, a rare earth fluoride, etc.; and preferable examples of the metal oxide include Cs 2 O, Li 2 O, MgO, SrO, BaO, CaO, etc.Between an anode and a light emitting layer, a hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof may be used. The hole-injection layer may be formed in a multi-layered manner to lower the hole-injection barrier (or hole-injection voltage) from the anode to the hole-transport layer or electron-blocking layer, and two compounds may be used simultaneously in each of the plurality of layers. The hole transport layer or the electron blocking layer may be multi-layered.Between a light emitting layer and a cathode, an electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof may be used. The electron buffer layer may be multi-layered to control electron injection and improve interfacial properties between the light emitting layer and the electron injection layer, and two compounds may be used simultaneously in each of the plurality of layers. The hole blocking layer or the electron transport layer may be multi-layered, and a plurality of compounds may be used in each of the plurality of layers.An auxiliary light emitting layer may be a layer disposed between an anode and a light emitting layer or between a cathode and a light emitting layer. When arranged between the anode and the light-emitting layer, the auxiliary light-emitting layer can be used for promoting hole injection and / or hole transport or for blocking overflow of electrons. When arranged between the cathode and the light emitting layer, the auxiliary light emitting layer may be used for promoting electron injection and / or electron transport or blocking overflow of holes. In addition, the hole auxiliary layer may be disposed between the hole transport layer (or hole injection layer) and the light emitting layer, and may exhibit an effect of enabling or blocking the hole transport rate (or hole injection rate), and thus may adjust the charge balance. In addition, the electron blocking layer may be disposed between the hole transport layer (or hole injection layer) and the light emitting layer, and block the overflow of electrons from the light emitting layer and restrict excitons in the light emitting layer to prevent light leakage. When an organic electroluminescent device contains two or more hole transport layers, the hole transport layer further contained may be used as a hole auxiliary layer or an electron blocking layer. The auxiliary light emitting layer, the hole auxiliary layer or the electron blocking layer may have an effect of improving the efficiency and / or the life of the organic electroluminescent device.In addition, in an 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 may be disposed on at least one surface of a pair of electrodes. In this case, the electron transport compound is reduced to an anion, thereby making it easier to inject and transport electrons from the mixed region into the light emitting medium. Further, the hole transport compound is oxidized to a cation, thereby making it easier to inject and transport holes from the mixed region into the light emitting medium. Preferred oxidative dopants include various Lewis acid and acceptor compounds, and preferred reductive dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. In addition, by using the reductive dopant layer as the charge generating layer, an organic electroluminescent device having at least two light emitting layers and emitting white light can be produced.The organic electroluminescent material according to an embodiment of the present disclosure may be used as a light emitting material for a white organic light emitting device. The white organic light emitting device has been proposed in various structures such as a side-by-side arrangement method, a stacking arrangement method, or a color conversion material (CCM), etc., according to the arrangement of red (R), green (G), or yellowish green (YG), and blue (B) light emitting units. In addition, the organic electroluminescent material according to an embodiment of the present disclosure may also be used in an organic electroluminescent device including a quantum dot (QD).For forming each layer of the organic electroluminescent device of the present disclosure, dry film forming methods such as vacuum evaporation, sputtering, plasma, ion plating method, etc., or wet film forming methods such as ink jet printing, nozzle printing, spray coating, spin coating, dip coating, coating method by flooding, etc., may be used. In forming a layer of the first host compound and the second host compound of the present disclosure, co-deposition or co-deposition is performed.When using a wet film forming method, a thin film can be formed by dissolving or diffusing materials forming each layer in a suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent may be any solvent in which the materials constituting each layer can be dissolved or diffused and in which there are no problems in film formability.In addition, it is possible to manufacture, using the organic electroluminescent device of the present disclosure, a display system, e.g., a display system for smartphones, tablets, notebooks, PCs, televisions, or cars, or a lighting system, e.g., an exterior or interior lighting system.Hereinafter, the manufacturing method of the compound of the present disclosure, the characteristics thereof, and the driving voltage and the luminous efficiency of the organic electroluminescent device (OLED) including a plurality of host compounds according to the present disclosure will be explained in detail with reference to the representative compounds of the present disclosure. However, the following examples merely describe the properties of the compound according to the present disclosure and the OLED comprising it, and the present disclosure is not limited to the following examples. In a flask, Compound 1 (35 g, 120.13 mmol), 2-bromo-9-phenyl-9H-carbazole (58 g, 180.19 mmol), Cul (11 g, 60.06 mmol), ethylenediamine (8 ml, 120.13 mmol) and cesium carbonate (Cs 2 CO 3) (78 g, 240.26 mmol) were dissolved in 600 ml of o-xylene, and the mixture was stirred under reflux for 6 hours. Then, the mixture was cooled to room temperature, and H 2 O was added to the solid reaction product, stirred for 30 minutes, filtered and separated by column chromatography to give Compound H-99 (29.5 g, yield: 46.8%). <row><cell>H-99< / cell><cell>532,65< / cell><cell>278,6 °C< / cell>< / row><head xml:id="_3807b30411">Example 2: Preparation of Compound H-1< / head><p xml:id="_3807b30412"><figure xml:id="_3807b30413" n="0001" type="chem" style="portrait" facs="0169"><graphic height="54" width="102" source="DE102024115808A1_0169.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0169" / ><media mimeType="image / tif" url="DE102024115808A1_0169.tif" / >< / figure><p xml:id="_3807b30414" n="0069">In a flask, Compound 1 (10 g, 34.322 mmol), 3-bromo-9-phenyl-9H-carbazole (16.5 g, 51.484 mmol), Cul (3.2 g, 17.162 mmol), ethylenediamine (2.2 ml, 34.322 mmol) and cesium carbonate (Cs <hi rend="subscript">2< / hi> CO <hi rend="subscript">3< / hi>) (22,4 g, 68.646 mmol) were dissolved in 171 ml of o-xylene, followed by stirring the mixture under reflux for 6 hours. Then, the mixture was cooled to room temperature, and H <hi rend="subscript">2< / hi> O was added to the solid reaction product, stirred for 30 minutes, filtered and separated by column chromatography to give Compound H-1 (11.4 g, yield: 63%).<title desc="title" / ><row><cell>H-1< / cell><cell>532,65< / cell><cell>167,1 °C< / cell>< / row><figure xml:id="_3807b30430" n="0001" type="chem" style="portrait" facs="0170"><graphic height="59" width="100" source="DE102024115808A1_0170.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0170" / ><media mimeType="image / tif" url="DE102024115808A1_0170.tif" / >< / figure><p xml:id="_3807b30431" n="0070">In a flask, Compound 1 (9 g, 30.8 mmol), 4-bromo-9-phenyl-9H-carbazole (15 g, 46.5 mmol), Cu <hi rend="subscript">2< / hi> SO <hi rend="subscript">4< / hi>(2,5 g, 15.6 mmol) and potassium carbonate (K <hi rend="subscript">2< / hi> CO <hi rend="subscript">3< / hi>) (8,5 g, 61.5 mmol) were dissolved in 200 ml of o-dichlorobenzene, and the mixture was stirred under reflux for 4 hours. Then, the mixture was cooled to room temperature, and H <hi rend="subscript">2< / hi> O was added to the solid reaction product, stirred for 30 minutes, filtered and separated by column chromatography to give Compound H-2 (4 g, yield: 24%).<title desc="title" / ><row><cell>H-2< / cell><cell>532,65< / cell><cell>248,8 °C< / cell>< / row><figure xml:id="_3807b30449" n="0001" type="chem" style="portrait" facs="0171"><graphic height="64" width="115" source="DE102024115808A1_0171.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0171" / ><media mimeType="image / tif" url="DE102024115808A1_0171.tif" / >< / figure><p xml:id="_3807b30450" n="0071">In a flask, Compound 2 (5 g, 15.1 mmol), 3-bromo-9-phenyl-9H-carbazole (5.3 g, 16.6 mmol), Tris(dibenzylidenaceton)dipalladium (Pd <hi rend="subscript">2< / hi> dba <hi rend="subscript">3< / hi>) (0,69 g, 0.75 mmol), 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl (XPho) (0.72 g, 1.51 mmol) and sodium tert-butoxide (3.6 g, 37.8 mmol) were dissolved in 75 ml of o-xylene, followed by stirring the mixture under reflux for 1.5 hours. The mixture was cooled to room temperature, filtered over silica and separated by column chromatography to give Compound H-50 (7.3 g, yield: 85%).<title desc="title" / ><row><cell>H-50< / cell><cell>571,68< / cell><cell>216 °C< / cell>< / row><figure xml:id="_3807b30465" n="0001" type="chem" style="portrait" facs="0172"><graphic height="59" width="105" source="DE102024115808A1_0172.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0172" / ><media mimeType="image / tif" url="DE102024115808A1_0172.tif" / >< / figure><p xml:id="_3807b30466" n="0072">In a flask, Compound 2 (7 g, 21.187 mmol), 2-bromo-9-phenyl-9H-carbazole (7.5 g, 23.31 mmol), Tris(dibenzylidenaceton)dipalladium (Pd <hi rend="subscript">2< / hi> dba <hi rend="subscript">3< / hi>) (1,0 g, 1.093 mmol), 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, followed by stirring the mixture under reflux for 1.5 hours. The mixture was cooled to room temperature, filtered over silica and separated by column chromatography to give Compound H-100 (6.5 g, yield: 54%).<title desc="title" / ><row><cell>H-100< / cell><cell>571,68< / cell><cell>204,2 °C< / cell>< / row><figure xml:id="_3807b30481" n="0001" type="chem" style="portrait" facs="0173"><graphic height="54" width="95" source="DE102024115808A1_0173.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0173" / ><media mimeType="image / tif" url="DE102024115808A1_0173.tif" / >< / figure><p xml:id="_3807b30482" n="0073">In a flask, Compound 2 (10 g, 30.2 mmol), 4-bromo-9-phenyl-9H-carbazole (10.7 g, 32 mmol), Tris(dibenzylidenaceton)dipalladium (Pd <hi rend="subscript">2< / hi> dba <hi rend="subscript">3< / hi>) (1,4 g, 1.5 mmol), 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl (XPho) (1.45 g, 3 mmol) and sodium tert-butoxide (7.3 g, 75.96 mmol) were dissolved in 150 ml of o-xylene, followed by stirring the mixture under reflux for 1 hour. After completion of the reaction, the mixture was extracted with ethyl acetate and separated by column chromatography to give Compound H-51 (8 g, yield: 46.8%).<title desc="title" / ><row><cell>H-51< / cell><cell>571,68< / cell><cell>240 °C< / cell>< / row><figure xml:id="_3807b30497" n="0001" type="chem" style="portrait" facs="0174"><graphic height="11" width="192" source="DE102024115808A1_0174.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0174" / ><media mimeType="image / tif" url="DE102024115808A1_0174.tif" / >< / figure><figure xml:id="_3807b30498" n="0001" type="chem" style="portrait" facs="0175"><graphic height="52" width="124" source="DE102024115808A1_0175.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0175" / ><media mimeType="image / tif" url="DE102024115808A1_0175.tif" / >< / figure><p xml:id="_3807b30499" n="0074">In a flask, Compound 3 (10 g, 22.4 mmol), N,9-diphenyl-9H-carbazol-1-amine (9 g, 26 mmol), Tris(dibenzylidenaceton)dipalladium (Pd <hi rend="subscript">2< / hi> dba <hi rend="subscript">3< / hi>) (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, followed by stirring at 160° C. for 3 hours. The mixture was cooled to room temperature and filtered through celite to prepare a solid, and then separated by column chromatography to give Compound H-111 (7.1 g, yield: 45.3%).<title desc="title" / ><row><cell>H-111< / cell><cell>699,84< / cell><cell>211,4 °C< / cell>< / row><figure xml:id="_3807b30514" n="0001" type="chem" style="portrait" facs="0176"><graphic height="45" width="141" source="DE102024115808A1_0176.tif" url=" / 587a7656-7185-48f4-9864-39278a2a0513_DE102024115808A1_0176" / ><media mimeType="image / tif" url="DE102024115808A1_0176.tif" / >< / figure><p xml:id="_3807b30515" n="0075">In a flask, Compound 1 (5.0 g, 17.213 mmol), Compound 8 (6.7 g, 18.93 mmol), Tris(dibenzylidenaceton)dipalladium (Pd <hi rend="subscript">2< / hi> dba <hi rend="subscript">3< / hi>) (0,78 g, 0.86 mmol), sodium tert-butoxide (2.5 g, 25.819 mmol), and 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl (XPho) (0.82 g, 1.721 mmol) were dissolved in 100 ml of xylene, followed by stirring the mixture under reflux for 1 hour. After completion of the reaction, the mixture was cooled to room temperature and filtered through celite to prepare a solid, and then separated by column chromatography to give Compound H-6 (7.8 g, yield: 75%).<head xml:id="_3807b30518">Device Examples 1 to 5: Production of OLEDs by Co-deposition of a First Host Compound and a Second Host Compound According to the Present Disclosure< / head><p xml:id="_3807b30519" n="0076">An OLED according to the present disclosure was produced. First, a transparent electrode indium tin oxide (ITO) thin film (10 Ω / sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to ultrasonic washing with acetone and isopropyl alcohol in sequence, and then stored in isopropyl alcohol. The ITO substrate was mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 shown in Table 2 was introduced into one cell of the vacuum vapor deposition apparatus, and compound HT-1 was introduced into another cell. The two materials were evaporated at different rates, and compound HI-1 was deposited in a doping amount of 3 wt % based on the total amount of compound HI-1 and compound HT-1 to form a first hole injection layer having a thickness of 10 nm. Subsequently, compound HT-1 was deposited on the first hole-injection layer to form a first hole-transport layer having a thickness of 80 nm. Next, compound HT-2 was introduced into another cell of the vacuum vapor deposition apparatus and evaporated by applying an electric current to the cell, whereby a second hole transport layer having a thickness of 60 nm was deposited on the first hole transport layer. After the formation of the hole injection layer and the hole transport layers, a light emitting layer was deposited thereon as follows: The first host compound and second host compound shown in Table 1 below were each introduced as hosts into two cells of the vacuum vapor deposition apparatus, and Compound D-39 was introduced as a dopant into another cell. The two host materials were evaporated at a rate of 1:1, at the same time, the dopant material was evaporated at a different rate, and the dopant was deposited in a doping amount of 3% by weight based on the total amount of the hosts and the dopant to form a light emitting layer having a thickness of 40 nm on the second hole transport layer. Then, compound ET-1 and compound EI-1 were deposited in a weight ratio of 50:50 as an electron transport material to form an electron transport layer having a thickness of 35 nm on the light emitting layer. After depositing compound EI-1 as an electron injection layer having a thickness of 2 nm on the electron transport layer, an Al cathode having a thickness of 80 nm was deposited on the electron injection layer using another vacuum vapor deposition apparatus, to give an OLED. All materials used for the production of the OLED were purified by vacuum sublimation at 10 <hi rend="superscript">-6< / hi> Torr.<head xml:id="_3807b30521">Comparative Examples 1 to 5: Production of an OLED comprising a comparative compound as a host< / head><p xml:id="_3807b30522" n="0077">An OLED was 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 light-emitting layer host.<p xml:id="_3807b30523" n="0078">In Table 1 below, the driving voltage, the luminous efficiency, and the light emission color at a luminance of 5000 nit, and the time required to reduce the luminance from 100% to 95% at a luminance of 10,000 nit (lifetime: T95) for the OLEDs fabricated in Device Examples 1 to 5 and Comparative Examples 1 to 5 as described above are shown. [Table 1] Table 1]<title desc="title">[Table 1] Table 1]Apparatus 1H-99C-3003,030,9Red Red264Comparative Example 1H-99T-12,828,2Red Red186Apparatus 2H-2C-3003,130,7Red Red269Comparative Example 2H-2T-12,927,8Red Red125Apparatus 3H-1C-3003,032,3Red Red283Comparative Example 3H-1T-12,930,6Red Red176Apparatus 4H-6C-3003,132,4Red Red174Comparative Example 4H-6T-13,029,8Red Red64Apparatus 5H-50C-3003,034,0Red Red316Comparative Example 5H-50T-13,032,0Red Red195From Table 1 above, it can be seen that the OLEDs having the plurality of host materials according to the present disclosure exhibit driving voltage and luminous efficiency at least the same or similar level as the organic electroluminescent device including the conventional combination of hosts, and excellent durability properties.The compounds used in the device examples and the comparative examples are shown in Table 2 below. [Table 2] [Table 2]Hole Injection Layer / Hole Transport LayerLight-emitting layer / electron buffer layerElectron-transport layer / electron-injection layerReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedKR 2020-0014189

[0004] KR 2018-0021961

[0042] KR 2018-0012709

[0042]

Claims

A plurality of host materials comprising a first host material comprising a compound represented by the following formula 1 and a second host material comprising a compound represented by the following formula 2: wherein in formula 1, L 1 represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3- to 30-membered) heteroarylene; Ar 1 is hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, -N-(L 2- Ar 2)( L 3- Ar 3), a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl; L 2 and L 3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar 2 and Ar 3 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; is represented by the following formula 1-1 or 1-2; wherein, in the formulae 1-1 and 1-2, X 1 to X 25 each independently represent N or CR a ; R a each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)-alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to one or more rings; * represents a site linked to L 1 ; wherein in formula 2, X represents O or S; L 4 and L 5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene; Ar 4 and Ar 5 each independently represent a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; R 1 and R 2 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a 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 when a and b each represent an integer having a value of 2 or more, each of R 1 and each of R 2 may be the same or different from each other.The multiple host materials of claim 1, wherein formula 1-1 is represented by the following formula 1-1-1: wherein in formula 1-1-1, R 41 to R 43 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to one or more rings; barepresents an integer of 1 to 3, bbrepresents an integer of 1 to 4, bcrepresents an integer of 1 to 5, and when ba, bb, and bceach represent an integer having a value of 2 or more, each of R 41, each of R 42 and each of R 43 may be the same or different from each other.The multiple host materials of claim 1, wherein formula 1-2 is represented by the following formula 1-2-1: wherein in formula 1-2-1, R 31 to R 34 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri-(C1-C30)alkylsilyl, a substituted or unsubstituted di-(C1-C30)-alkyl-(C6-C30)-arylsilyl, a substituted or unsubstituted (C1-C30)-alkyldi-(C6-C30)-arylsilyl, a substituted or unsubstituted tri-(C6-C30)-arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)-alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)-arylamino or a substituted or unsubstituted (C1-C30)-alkyl-(C6-C30)-arylamino or may be linked to one or more adjacent substituents to 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 having a value of 1 or 2, and when aa, ab, ac and ad each represent an integer having a value of 2 or more, each of R 31, each of R 32, each of R 33 and each of R 34 may be the same or different from each other.The multiple host materials according to claim 1, wherein at least one of Ar 2 and Ar 3 in Formula 1 is represented by any one of the following Formulae 1-3-1 to 1-3-4: wherein, in formulae 1-3-1 to 1-3-4, T represents O, S, CR 5 R 6, NR 7 or Se, R 3 to R 7 have the same definition as R a in claim 1, c represents an integer of 1 to 4, d represents an integer of 1 to 3, and when c and d each represent an integer having a value of 2 or more, each of R 3 and each of R 4 may be the same or different from each other.The multiple host materials of claim 1, wherein Formula 2 is represented by any one of the following Formulae 2-1 to 2-4: wherein in formulae 2-1 to 2-4, X, R 1, R 2, L 4, L 5, Ar 4, Ar 5, a and b have the same definitions as in claim 1.The plurality of host materials according to claim 1, wherein the compound represented by formula 1 is at least one compound selected from the following compounds: wherein in the above compounds, Dn represents that n hydrogen atoms are replaced by deuterium.The plurality of host materials according to claim 1, wherein the compound represented by formula 2 is at least one compound selected from the following compounds: 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 the plurality of host materials of claim 1.

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