Organic electroluminescent element

Abstract

We provide organic electroluminescent elements. [Solution] This disclosure relates to an organic electroluminescent element comprising an anode, a cathode, and an organic material layer disposed between the anode and the cathode, wherein the organic material layer comprises two or more light-emitting layers disposed between the anode and the cathode, and the two or more light-emitting layers comprise a first light-emitting layer disposed between the anode and the cathode and a second light-emitting layer disposed between the first light-emitting layer and the cathode. The first light-emitting layer and the second light-emitting layer are in direct contact with each other, and at least one of the first light-emitting layer and the second light-emitting layer comprises a plurality of host materials. According to this disclosure, an organic electroluminescent element having improved element characteristics can be provided.

Description

[Technical Field]

[0001] This disclosure relates to an organic electroluminescent element. [Background technology]

[0002] The green-emitting TPD / Alq3 bilayer small molecule organic electroluminescent device (OLED), consisting of a light-emitting layer and a charge transport layer, was first developed in 1987 by Tang et al. at Eastman Kodak. Since then, research on organic electroluminescent devices has progressed very rapidly, and OLEDs have been commercialized ever since. Currently, OLEDs mainly use phosphorescent materials that have excellent luminescence efficiency in panel mounting. However, for many applications such as TVs and lighting, the lifespan of OLEDs is insufficient, and higher efficiency of OLEDs is still needed. Typically, as the brightness of an OLED increases, its lifespan becomes shorter. Therefore, for long-term use and high display resolution, OLEDs with long-life characteristics are required.

[0003] To improve the lifetime characteristics, various materials or concepts have been proposed for the organic layer of organic electroluminescent elements, but these have not been satisfactory for practical use. In addition, there is a continuous need to develop organic electroluminescent elements with improved performance, such as improved lifetime characteristics compared to specific combinations of compounds previously disclosed.

[0004] However, while Patent Document 1 discloses an organic electroluminescent element comprising multiple light-emitting layers, it does not specifically disclose an organic electroluminescent element in which one light-emitting layer comprises multiple phosphorescent host materials. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Korean Patent Application Publication No. 2019-0088651 Specification [Patent Document 2] Korean Patent Application Publication No. 10-2018-0099510 Specification [Patent Document 3] Korean Patent Application Publication No. 10-2021-0008812 Specification [Patent Document 4] Korean Patent Application Publication No. 10-2021-0124018 Specification [Patent Document 5] Korean Patent Application Publication No. 10-2021-0052660 Specification [Patent Document 6] Korean Patent Application Publication No. 10-2021-0006283 Specification [Patent Document 7] Korean Patent Application Publication No. 10-2023-0063852 Specification [Patent Document 8] Korean Patent Application Publication No. 10-2023-0174704 Specification [Overview of the project] [Problems that the invention aims to solve]

[0006] The object of this disclosure is to provide an organic electroluminescent element having improved element characteristics compared to conventional organic electroluminescent elements. [Means for solving the problem]

[0007] As a result of intensive research to solve the above technical problems, the inventors have found that the aforementioned object can be achieved by an organic electroluminescent element comprising an anode; a cathode; and an organic material layer disposed between the anode and the cathode, wherein the organic material layer comprises two or more light-emitting layers provided between the anode and the cathode, the two or more light-emitting layers comprising a first light-emitting layer between the anode and the cathode and a second light-emitting layer disposed between the first light-emitting layer and the cathode, the first light-emitting layer and the second light-emitting layer being in direct contact with each other, and at least one of the first light-emitting layer and the second light-emitting layer comprising a plurality of host materials, thereby completing the present invention.

[0008] Advantageous effects of the invention The organic electroluminescent device according to this disclosure comprises multiple light-emitting layers, each of which at least one light-emitting layer contains multiple host materials, thereby exhibiting improved characteristics in terms of voltage, current efficiency, and lifetime. [Modes for carrying out the invention]

[0009] Modes relating to the present invention This disclosure is described in detail below. However, the following description is intended to illustrate the invention and is not intended to limit the scope of the invention in any way.

[0010] The organic electroluminescent element according to this disclosure includes an anode, a cathode, and an organic material layer disposed between the anode and the cathode, wherein the organic material layer includes two or more light-emitting layers provided between the anode and the cathode, the two or more light-emitting layers including a first light-emitting layer between the anode and the cathode and a second light-emitting layer disposed between the first light-emitting layer and the cathode, wherein the first light-emitting layer and the second light-emitting layer are in direct contact with each other, and at least one of the first light-emitting layer and the second light-emitting layer includes a plurality of host materials.

[0011] In this specification, the term “organic electroluminescent compound” as used herein means a compound that can be used in an organic electroluminescent device, which may, if necessary, be included in any material layer constituting the organic electroluminescent device.

[0012] In this specification, the term “organic electroluminescent material” means a material that can be used in an organic electroluminescent device, which may include at least one compound. The organic electroluminescent material may be included in any of the layers constituting the organic electroluminescent device, as needed. For example, the organic electroluminescent material may be a hole injection material, a hole transport material, a hole auxiliary material, a light emission auxiliary material, an electron blocking material, a light emission material (including host and dopant materials), an electron buffer material, a hole blocking material, an electron transport material, or an electron injection material.

[0013] In this disclosure, the term “multiple organic electroluminescent materials” means an organic electroluminescent material comprising a combination of at least two compounds that may be contained in any layer constituting an organic electroluminescent device. It may mean both the material before (e.g., before deposition) and the material after (e.g., after deposition) it may be contained in the organic electroluminescent device. For example, multiple organic electroluminescent materials may be a combination of at least two compounds that may be contained in at least one layer of the hole injection layer, hole transport layer, hole auxiliary layer, light emission auxiliary layer, electron blocking layer, light emission layer, electron buffer layer, hole blocking layer, electron transport layer, and electron injection layer. Such at least two compounds may be contained in the same layer or in different layers by methods used in the art, for example, by mixed evaporation or simultaneous evaporation, or by evaporation separately.

[0014] In this specification, the term “multiple host materials” means an organic electroluminescent material comprising a combination of at least two host materials. It may mean both the material before (e.g., before deposition) and the material after (e.g., after deposition) it is incorporated into the organic electroluminescent element. The multiple host materials of this disclosure may be incorporated into any light-emitting layer constituting the organic electroluminescent element. At least two compounds comprising the multiple host materials may be incorporated together into one light-emitting layer, or each may be incorporated into separate light-emitting layers. If at least two compounds are incorporated into one light-emitting layer, the at least two compounds may be mixed and evaporated to form a layer, or they may be co-evaporated individually and simultaneously to form a layer.

[0015] In this specification, "(C1~C 30 "(C3-C)alkyl" means a linear or branched alkyl having 1 to 30 carbon atoms that make up the chain, where the number of carbon atoms is preferably 1 to 20, more preferably 1 to 10. The above alkyls may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc. In this specification, "(C3-C)alkyl" means a linear or branched alkyl having 1 to 30 carbon atoms that make up the chain, where the number of carbon atoms is preferably 1 to 20, more preferably 1 to 10. 30 "(C6-C)" means a monocyclic or polycyclic hydrocarbon having 3 to 30 carbon atoms in its ring skeleton, where the number of carbon atoms is preferably 3 to 20, more preferably 3 to 7. The above cycloalkyls may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclohexylmethyl, etc. In this disclosure, "(3-7 membered) heterocycloalkyl" means a cycloalkyl having 3 to 7 ring skeleton atoms, preferably 5 to 7 ring skeleton atoms, and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, preferably O, S, and N, where these include tetrahydrofuran, pyrrolidine, thiolane, tetrahydropyran, etc. In this disclosure, "(C6-C)" means a cycloalkyl having 3 to 7 ring skeleton atoms, preferably 5 to 7 ring skeleton atoms, and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P. 30The term "aryl(ene)" means a monocyclic or fused ring group derived from an aromatic hydrocarbon having 6 to 30 carbon atoms in the ring skeleton, where the number of carbon atoms in the ring skeleton is preferably 6 to 20, more preferably 6 to 15. The above-mentioned aryl may be partially saturated or may contain a spiro structure. Examples of aryl compounds include phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, dimethylfluorenyl, diphenylfluorenyl, benzofluorenyl, diphenylbenzofluorenyl, dibenzofluorenyl, phenantrenyl, benzophenantrenyl, phenylphenantrenyl, anthracenyl, benzanthracenyl, indenyl, triphenylenyl, pyrenyl, tetracerenyl, perilenyl, crisenyl, benzocrisenyl, naphthacenyl, fluoranthenyl, benzofluoranthenyl, tolyl, xylyl, mesityl, cumenyl, spiro[fluoren-fluoren]yl, spiro[fluoren-benzofluoren]yl, azlenyl, tetramethyl-dihydrophenantrenyl, and others. More specifically, aryls include 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, o-biphenyl, m-biphenyl, p-biphenyl, o-terphenyl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, p-terphenyl Phenyl-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-Phenanthril, 2-Phenanthril, 3-Phenanthril, 4-Phenanthril, 9-Phenanthril, 1-Crysenyl, 2-Crysenyl, 3-Crysenyl, 4-Crysenyl, 5-Crysenyl, 6-Crysenyl, Benzo[c]Phenanthril, Benzo[g]Crysenyl, 1-Triphenylenyl, 2-Triphenylenyl, 3-Triphenylenyl, 4-Triphenylenyl, 3-Fluoranthenyl, 4-Fluoranthenyl, 8-Fluoranthenyl, 9-Fluoro Lanthenyl, benzofluoranthenyl, 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 Nyl, 11,11-dimethyl-10-benzo[a]fluorenyl, 11,11-dimethyl-1-benzo[b]fluorenyl, 11,11-dimethyl-2-benzo[b]fluorenyl, 11,11-dimethyl-3-benzo[b]fluorenyl, 11,11-dimethyl-4-benzo[b]fluorenyl, 11,11-dimethyl-5-benzo[b]fluorenyl, 11,11-dimethyl-6-benzo[b]fluorenyl, 11,11-dimethyl-7-benzo[b]fluorenyl, 11,11-dimethyl-8-benzo[b]fluorenyl, 11,11-dimethyl- 9-benzo[b]fluorenyl, 11,11-dimethyl-10-benzo[b]fluorenyl, 11,11-dimethyl-1-benzo[c]fluorenyl, 11,11-dimethyl-2-benzo[c]fluorenyl, 11,11-dimethyl-3-benzo[c]fluorenyl, 11,11-dimethyl-4-benzo[c]fluorenyl, 11,11-dimethyl-5-benzo[c]fluorenyl, 11,11-dimethyl-6-benzo[c]fluorenyl, 11,11-dimethyl-7-benzo[c]fluorenyl, 11,11-dimethyl-8-benzo[c]fluorenyl,11,11-dimethyl-9-benzo[c]fluorenyl, 11,11-dimethyl-10-benzo[c]fluorenyl, 11,11-diphenyl-1-benzo[a]fluorenyl, 11,11-diphenyl-2-benzo[a]fluorenyl, 11,11-diphenyl-3-benzo[a]fluorenyl, 11,11-diphenyl-4-benzo[a]fluorenyl, 11,11-diphenyl-5-benzo[a]fluorenyl, 11,11-diphenyl-6-benzo[a]fluorenyl, 11,11-diphenyl-7-benzo[a]fluorenyl, 11, 11-diphenyl-8-benzo[a]fluorenyl, 11,11-diphenyl-9-benzo[a]fluorenyl, 11,11-diphenyl-10-benzo[a]fluorenyl, 11,11-diphenyl-1-benzo[b]fluorenyl, 11,11-diphenyl-2-benzo[b]fluorenyl, 11,11-diphenyl-3-benzo[b]fluorenyl, 11,11-diphenyl-4-benzo[b]fluorenyl, 11,11-diphenyl-5-benzo[b]fluorenyl, 11,11-diphenyl-6-benzo[b]fluorenyl, 11,1 1-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-1-phenantrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-2-phenantrenyl, 9,9,10,10-tetramethyl-9,10-dihydro-3-phenantrenyl,This could be 9,9,10,10-tetramethyl-9,10-dihydro-4-phenantrenyl, etc. In this disclosure, "(3-30 membered) heteroaryl(ene)" is an aryl having 3 to 30 ring skeleton atoms and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si, P, Se, and Ge, where the number of ring skeleton atoms is preferably 5 to 25. The number of heteroatoms in the heteroaryl is preferably 1 to 4. The above heteroaryl may be a monocyclic ring or a fused ring fused with at least one benzene ring, and may be partially saturated. Furthermore, the above heteroaryl in this specification may be formed by bonding at least one heteroaryl or aryl group to a heteroaryl group via a single bond. Examples of heteroaryls include, specifically, monocyclic heteroaryls such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetradinyl, triazolyl, tetrazolyl, flazanil, pyridyl, pyrazinyl, pyrimidinyl, pyridadinyl, etc., as well as benzofuranil, benzothiophenyl, isobenzofuranil, dibenzofuranil, dibenzothiophenyl, dibenzoselenophenyl, benzofloquinolinil, benzofloquinazolinil, benzoflonaphtylidinil, benzoflopyrimidinil, naphthoflopyrimidinil, benzothienocinolinil, benzothienocinazolinil, and benzothienonaph Tyridine, benzothienopyrimidinil, naphthienopyrimidinil, pyrimidoindolyl, benzopyrimidoindolyl, benzoflopyrazinil, naphthoflopyradinil, benzothienopyrazinil, naphthienopyrazinil, pyrazinoindolyl, benzopyrazinoindolyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, imidazopyridinil, isoindolyl, indolyl, benzoindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinil, quinazolinil, quinoxalinil, carbazolyl, azacarbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxadinil, phenantridinil, benzodioxolyl,Examples of condensed ring heteroaryls include indolidinyl, acridinyl, silafluorenyl, germafluorenyl, benzotriazolyl, phenadinyl, imidazopyridinyl, clomenoquinazolinyl, thioclomenoquinazolinyl, dimethylbenzopyrimidinyl, indocarbazolyl, and indenocarbazolyl. More specifically, heteroaryls include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 2-pyridinyl, 3-pyridinyl, 4-pyridinyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazine-4-yl, 1,2,4-triazine-3-yl, 1,3,5-triazine-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5-indolidinyl, and 6-indolidinyl. , 7-Indolizidinyl, 8-Indolizidinyl, 2-Imidazopyridinyl, 3-Imidazopyridinyl, 5-Imidazopyridinyl, 6-Imidazopyridinyl, 7-Imidazopyridinyl, 8-Imidazopyridinyl, 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-benzofuranil, 3-benzofuranil, 4-benzofuranil, 5-benzofuranil, 6-benzofuranil, 7-benzofuranil, 1-isobenzofuranil, 3-isobenzofuranil, 4-isobenzofuranil, 5-isobenzofuranil, 6-isobenzofuranil, 7-isobenzofuranil, 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-Phenantridinyl, 2-Phenantridinyl, 3-Phenantridinyl, 4-Phenantridinyl, 6- Phenanthridine, 7-Phenanthridine, 8-Phenanthridine, 9-Phenanthridine, 10-Phenanthridine, 1-Acridinyl, 2-Acridinyl, 3-Acridinyl, 4-Acridinyl, 9-Acridinyl, 2-Oxazolyl, 4-Oxazolyl, 5-Oxazolyl, 2-Oxadiaziyl, 5-Oxadiaziyl, 3-Furazanyl, 2-Thienyl, 3-Thienyl, 2-Methylpyrrole-1-yl, 2-Methylpyrrole-3-yl, 2-Methylpyrrole-4-yl, 2-Methylpyrrole-5-yl, 3-Methylpyrrole-1-yl, 3-methylpyrrole-2-yl, 3-methylpyrrole-4-yl, 3-methylpyrrole-5-yl, 2-t-butylpyrrole-4-yl, 3-(2-phenylpropyl)pyrrole-1-yl, 2-methyl-1-indolly, 4-methyl-1-indolly, 2-methyl-3-indolly, 4-methyl-3-indolly, 2-t-butyl-1-indolly, 4-t-butyl-1-indolly, 2-t-butyl-3-indolly, 4-t-butyl-3-indolly, 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 Furanyl, 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 Ranyl, 1-naphtho-[2,1-b]-benzofuranil, 2-naphtho-[2,1-b]-benzofuranil, 3-naphtho-[2,1-b]-benzofuranil, 4-naphtho-[2,1-b]-benzofuranil, 5-naphtho-[2,1-b]-benzofuranil, 6-naphtho-[2,1-b]-benzofuranil, 7-naphtho-[2,1-b]-benzofuranil, 8-naphtho-[2,1-b]-benzofuranil, 9-naphtho-[2,1-b]-benzofuranil, 10-naphtho-[2,1-b]-benzofuranil, 1-naphtho-[1,2-b]-benzothioff phenyl, 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-benzoflo[3,2-d]pyrimidinyl, 6-benzoflo[3,2-d]pyrimidinyl, 7-benzoflo[3,2-d]pyrimidinyl, 8-benzoflo[3,2-d]pyrimidinyl, 9-benzoflo[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-benzoflo[3,2-d]pyrazinyl, 6-benzoflo[3,2-d]pyrazinyl, 7-benzoflo[3,2-d]pyrazinyl, 8-benzoflo[3,2-d]pyrazinyl, 9-benzoflo[3,2-d]pyrazinyl, 2-benzothio[3,2-d]pyrazinyl, 6-benzothio[ These may include 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, "heteroaryl(ene)" can be classified as heteroaryl(ene) having electronic properties or heteroaryl(ene) having hole properties. Heteroaryl(ene) having electronic properties are,A substituent in which electrons are relatively abundant in the parent nucleus may be, for example, a substituted or unsubstituted pyridinyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted quinolyl, etc. A heteroaryl(ene) having hole properties is a substituent in which electrons are relatively deficient in the parent nucleus may be, for example, a substituted or unsubstituted carbazolyl, a substituted or unsubstituted dibenzofuranyl, or a substituted or unsubstituted dibenzothiophenyl. In this specification, "(C3~C, 30 ) aliphatic ring and (C6~C 30 A fused ring with an aromatic ring means a ring formed by condensing at least one aliphatic ring having 3 to 30 carbon atoms in its ring skeleton (where the number of carbon atoms is preferably 3 to 25, more preferably 3 to 18) with at least one aromatic ring having 6 to 30 carbon atoms in its ring skeleton (where the number of carbon atoms is preferably 6 to 25, more preferably 6 to 18). For example, the fused ring may be a fused ring of at least one benzene and at least one cyclohexane, or a fused ring of at least one naphthalene and at least one cyclopentane, etc. In this specification, (C3~C 30 ) aliphatic ring and (C6~C 30 The carbon atoms in the fused ring with the aromatic ring may be replaced with at least one heteroatom selected from B, N, O, S, Si, and P, preferably at least one heteroatom selected from N, O, and S. The term "halogen" in this disclosure includes F, Cl, Br, and I.

[0016] In addition, "ortho-" ("o-"), "meta-" ("m-"), and "para-" ("p-") are intended to indicate the substitution positions of all substituents. The ortho-configuration describes a compound with substituents adjacent to each other at positions 1 and 2 on benzene, for example. The meta-configuration describes a compound with substituents at the substitution position immediately following the adjacent substitution position, for example, at positions 1 and 3 on benzene. The para-configuration describes a compound with substituents at the substitution position immediately following the meta-position, for example, at positions 1 and 4 on benzene.

[0017] In this specification, “a ring formed by bonding to adjacent substituents” means a substituted or unsubstituted 3- to 30-membered monocyclic or polycyclic alicyclic ring, aromatic ring, or combination thereof, formed by bonding or fusing two or more adjacent substituents, preferably a substituted or unsubstituted 3- to 26-membered monocyclic or polycyclic alicyclic ring, aromatic ring, or combination thereof. Furthermore, the formed ring may contain at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, preferably N, O, and S. According to one embodiment of this disclosure, the number of ring skeleton atoms is 5-20; according to another embodiment of this disclosure, the number of ring skeleton atoms is 5-15. In one embodiment, the condensed ring may be, for example, 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 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.

[0018] In addition, the term "substituted" in the expression "substituted or unsubstituted" means that a hydrogen atom in a certain functional group is replaced by another atom or functional group, that is, a substituent. Unless otherwise specified, the substituent may not be limited to hydrogen at the position where the substituent can be substituted. When two or more hydrogen atoms are each replaced by a substituent in the functional group, the substituents may be the same or different from each other. It also includes that a hydrogen atom is replaced by a group formed by the bonding of two or more of the above substituents. For example, the "group formed by the bonding of two or more substituents" may be pyridine-triazine. That is, pyridine-triazine may be a heteroaryl or can be interpreted as one substituent to which two heteroaryls are bonded. Preferably, substituted alkyl, substituted alkylene, substituted alkenyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted cycloalkyl, substituted cycloalkylene, substituted alkoxy, substituted trialkylsilyl, substituted dialkylarylsilyl, substituted alkyldiarylsilyl, substituted triarylsilyl, and substituted condensed rings of an aliphatic ring and an aromatic ring are each independently deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; phosphine oxide; (C1-C 30 )alkyl; halo(C1-C 30 )alkyl; unsubstituted or at least one (C6-C 30 )aryl-substituted (C2-C 30 )alkenyl; (C2-C 30 )alkynyl; (C1-C 30 )alkoxy; (C1-C 30 )alkylthio; (C3-C 30 )cycloalkyl; (C3-C 30 )cycloalkenyl; (3-7 member) heterocycloalkyl; (C6-C 30 )aryloxy; (C6-C 30 )arylthio; unsubstituted or at least one (C6-C 30 )aryl-substituted (3-30 member) heteroaryl; unsubstituted or (C1-C 30(C6-C) substituted with at least one alkyl and (3-30 membered) heteroaryl 30 )Arial; Tri (C1~C 30 ) Alkylsilyl; Tri(C6~C 30 ) Aryl silyl; di(C1~C 30 ) Alkyl (C6~C 30 ) Arylsilyl; (C1~C 30 ) Alkyl di(C6~C 30 ) Arylsilyl; (C3~C 30 ) aliphatic ring and (C6~C 30 ) A condensed ring with an aromatic ring; amino; mono- or di(C1~C 30 ) Alkylamino; mono- or di(C2~C 30 ) Alkenylamino; substituted or unsubstituted mono- or di(C6~C 30 )Arylamino; mono- or di(3-30 member) heteroarylamino; (C1-C 30 ) Alkyl (C2~C 30 ) Alkenylamino; (C1~C 30 ) Alkyl (C6~C 30 ) Arylamino; (C1~C 30 )Alkyl (3-30 member) heteroarylamino; (C2-C 30 ) Alkenil (C6~C 30 ) Arylamino; (C2~C 30 ) Alkenyl (3-30 member) heteroarylamino; (C6-C 30 )aryl (3-30 member) heteroarylamino; (C1-C 30 ) Alkylcarbonyl; (C1~C 30 ) Acoxycarbonyl; (C6~C 30 ) Arylcarbonyl; di(C6~C 30 ) Arylboronyl; di(C1~C 30 ) Alkylboronyl; (C1~C 30 ) Alkyl (C6~C 30 ) Arylboronyl; (C6~C 30 )ar(C1~C 30 )alkyl; and (C1~C 30 ) Alkyl (C6~C 30) can be substituted with at least one selected from the group consisting of aryls. For example, each substituted alkyl can be independently (C1~C 25 )alkyl; (C3~C 25 )Cycloalkyl; unsubstituted or (C1~C 30 (C6-C) substituted with at least one alkyl and (3-30 membered) heteroaryl 25 )aryl; unsubstituted or at least one (C6~C 30 ) aryl-substituted (3-25 member) heteroaryls; and unsubstituted or (C6-C) heteroaryls; 30 ) Mono- or di(C6~C) replaced with aryl 25 ) may be substituted with at least one selected from the group consisting of arylaminos. For example, substituted alkyls may be substituted with methyl, phenyl, biphenyl, terphenyl, naphthyl, naphthyl substituted with phenyl, naphthyl substituted with naphthyl, naphthyl substituted with dibenzofuranyl, phenantrenyl, triphenylene, benzofluorenyl, methyl substituted with benzofluorenyl, phenyl substituted with benzofluorenyl, carbazolyl, phenyl substituted with carbazolyl, dibenzofuranyl, dibenzothiophenyl, diphenylamino, phenylbiphenylamino, etc.

[0019] Where substituents are not shown in the chemical formulas or compound structures of this disclosure, it may mean that all possible positions as substituents are hydrogen or deuterium. That is, in the case of deuterium (an isotope of hydrogen), some of the hydrogen atoms may be the isotope deuterium, in which case the deuterium content may range from 0% to 100%. Where substituents are not shown in the chemical formulas or compound structures of this disclosure, when deuterium is not explicitly excluded, hydrogen and deuterium may be mixed and used in the compound, for example, when the deuterium content is 0%, the hydrogen content is 100%, and all substituents are hydrogen. Deuterium is an element that has a deuteron as its nucleus, consisting of one proton and one neutron, and it is one of the isotopes of hydrogen, and may be represented as hydrogen-2, with the element symbol D or 2It could be H. Isotopes with the same atomic number (Z) and different mass numbers (A) can also be interpreted as elements with the same number of protons and different numbers of neutrons.

[0020] In this specification, “their combinations” means that one or more components of the corresponding list are combined to form known or chemically stable arrangements that can be conceived by those skilled in the art from the corresponding list. For example, alkyl and deuterium may be combined to form partially or completely deuterated alkyl groups, halogens and alkyls may be combined to form alkyl halide substituents, and halogens, alkyls, and aryls may be combined to form arylalkyl halides. For example, preferred combinations of substituents may contain 50 or fewer atoms excluding hydrogen and deuterium, or 40 or fewer atoms excluding hydrogen and deuterium, or 30 or fewer atoms excluding hydrogen and deuterium, or in many cases, preferred combinations of substituents may contain 20 or fewer atoms excluding hydrogen and deuterium.

[0021] In the formulas of this disclosure, if multiple substituents are represented by the same symbol, each of these substituents represented by the same symbol may be identical or different from one another.

[0022] An organic electroluminescent element according to one embodiment is described in more detail below in this specification.

[0023] The organic electroluminescent element according to this disclosure includes an anode; a cathode; and an organic material layer disposed between the anode and the cathode, wherein the organic material layer includes two or more light-emitting layers provided between the anode and the cathode, the two or more light-emitting layers including a first light-emitting layer between the anode and the cathode and a second light-emitting layer disposed between the first light-emitting layer and the cathode, the first light-emitting layer and the second light-emitting layer being in direct contact with each other, and at least one of the first light-emitting layer and the second light-emitting layer containing a plurality of host materials.

[0024] In one embodiment, the first light-emitting layer and the second light-emitting layer each have the following formula 1 as the first host material: [ka] It may contain compounds represented by [formula].

[0025] In formula 1, Each of X1 to X3 independently represents -N= or -CR1=, provided that at least one of X1 to X3 is N; R1 is hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C3-C 30 )Cycloalkyl, substituted or unsubstituted (C1~C 30 ) Acoxidil, 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 ) Alkyl di(C6~C 30 ) Arylsilyl, substituted or unsubstituted tri(C6~C 30 ) Arylsilyl, or (C3~C 30 ) aliphatic ring and (C6~C 30 ) Represents a fused ring, either substituted or unsubstituted with an aromatic ring; L1~L3 are each independently single bonds, substituted, or unsubstituted (C6~C 30 ) Arylene, substituted or unsubstituted (C3~C 30 ) Represents cycloalkylene, or substituted or unsubstituted (3-30 member) heteroarylene; Ar1~Ar3 are each independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C3-C 30)Cycloalkyl, substituted or unsubstituted (C1-C 30 )Acyloxy, 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, (C3-C 30 )An aliphatic ring and (C6-C 30 )A substituted or unsubstituted fused ring of an aromatic ring, or represents *-N-(R2)(R3); or may be bonded to adjacent substituents to form a ring; provided that at least one of Ar1 to Ar3 is a substituted or unsubstituted (C6-C 30 )Aryl or a substituted or unsubstituted (3-30 member) heteroaryl; R2 and R3 are each independently a substituted or unsubstituted (C1-C 30 )Alkyl, substituted or unsubstituted (C2-C 30 )Alkenyl, substituted or unsubstituted (C6-C 30 )Aryl, or a substituted or unsubstituted (3-30 member) heteroaryl.

[0026] In one embodiment of the present disclosure, at least two of X1 to X3 can be N.

[0027] According to another embodiment of the present disclosure, all of X1 to X3 can be N.

[0028] According to one embodiment of the present disclosure, R1 can be hydrogen, deuterium, halogen, cyano, or a substituted or unsubstituted (C1-C 10 )Alkyl, for example, R1 can be hydrogen or deuterium.

[0029] According to one embodiment of the present disclosure, L1 to L3 are each independently a single bond, a substituted or unsubstituted (C6-C 30)An arylene, or a substituted or unsubstituted (5-30 member) heteroarylene, preferably a single bond, a substituted or unsubstituted (C6-C 25 )arylene or a substituted or unsubstituted (5-25 member) heteroarylene, more preferably a single bond, a substituted or unsubstituted (C6-C 18 )arylene or a substituted or unsubstituted (5-18 member) heteroarylene. For example, L1-L3 can each independently be a single bond, a substituted or unsubstituted phenylene, a substituted or unsubstituted naphthylene, a substituted or unsubstituted biphenylene, a substituted or unsubstituted naphthylphenylene, a substituted or unsubstituted phenylnaphthylene, a substituted or unsubstituted fluorenylene, a substituted or unsubstituted phenanthrenylene, a substituted or unsubstituted dibenzofuranylene, a substituted or unsubstituted benzonaphthothiophenylene, or a substituted or unsubstituted benzonaphthofuranylene.

[0030] According to one embodiment of the present disclosure, Ar1-Ar3 are each independently a substituted or unsubstituted (C6-C 30 )aryl, a substituted or unsubstituted (5-30 member) heteroaryl, a substituted or unsubstituted (C3-C 30 )cycloalkyl, or a substituted or unsubstituted tri(C6-C 30 )arylsilyl, preferably a substituted or unsubstituted (C6-C 25 )aryl, a substituted or unsubstituted (5-25 member) heteroaryl, a substituted or unsubstituted (C3-C 25 )cycloalkyl, or a substituted or unsubstituted tri(C6-C 25 )arylsilyl, more preferably a substituted or unsubstituted (C6-C 25 )aryl, a substituted or unsubstituted (5-18 member) heteroaryl, a substituted or unsubstituted (C6-C 25 )cycloalkyl, or a substituted or unsubstituted tri(C6-C 18) may be an arylsilyl. In this case, at least one of Ar1 to Ar3 may be a substituted or unsubstituted (5 to 30 member) heteroaryl, and preferably at least two of Ar1 to Ar3 may be substituted or unsubstituted (5 to 30 member) heteroaryls. For example, each of Ar1 to Ar3 may independently be a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted p-biphenyl, a substituted or unsubstituted m-biphenyl, a substituted or unsubstituted o-biphenyl, a substituted or unsubstituted o-terphenyl, a substituted or unsubstituted m-terphenyl, a substituted or unsubstituted p-terphenyl, a substituted or unsubstituted triphenylsilyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted spirobifluorenyl, a substituted or unsubstituted carbazolyl, a substituted or unsubstituted phenantrenyl, a substituted or unsubstituted benzophenantrenyl, or a substituted or unsubstituted crice It may be yl, substituted or unsubstituted triphenylenyl, substituted or unsubstituted fluoranthenyl, substituted or unsubstituted benzocarbazolyl, substituted or unsubstituted benzonaphthofuranil, substituted or unsubstituted benzonaphthothiophenyl, substituted or unsubstituted benzofluorenyl, substituted or unsubstituted benzothiazolyl, substituted or unsubstituted benzoxazolyl, substituted or unsubstituted benzimidazolyl, substituted or unsubstituted naphthoxazolyl, substituted or unsubstituted benzonaphthoxazolyl, substituted or unsubstituted naphthiazolyl, substituted or unsubstituted benzonaphthothiazolyl, substituted or unsubstituted naphthoimidazolyl, substituted or unsubstituted adamantyl, or substituted or unsubstituted bicycloheptenyl.Preferably, Ar1 to Ar3 can each independently be a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted p-biphenyl, a substituted or unsubstituted m-biphenyl, a substituted or unsubstituted o-terphenyl, a substituted or unsubstituted m-terphenyl, a substituted or unsubstituted triphenylsilyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted benzofluorenyl, a substituted or unsubstituted spirobifluorenyl, a substituted or unsubstituted phenantrenyl, a substituted or unsubstituted crisenyl, a substituted or unsubstituted triphenylenyl, a substituted or unsubstituted fluoranthenyl, a substituted or unsubstituted benzonaphthofuranil, a substituted or unsubstituted benzonaphthothiophenyl, a substituted or unsubstituted benzonaphthoxazolyl, a substituted or unsubstituted benzonaphthothiazolyl, a substituted or unsubstituted adamantyl, or a substituted or unsubstituted bicycloheptenyl. In this case, the substituent of the substituted group may be at least one selected from deuterium, cyano, methyl, phenyl, biphenyl, naphthyl, phenantrenyl, triphenylsilyl, fluorenyl, dibenzothiophenyl, and dibenzofuranyl.

[0031] In one embodiment of the present disclosure, at least one of Ar1 to Ar3 may be selected from the following formulas 1-1 to 1-7. [ka]

[0032] In equations 1-1 to 1-7, T represents -O-, -S-, -N(R)-, -C(R')(R")-, or -Se-; V represents -O- or -S-; R, R', and R'' can each be independently substituted or non-substituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, -L b -N-(Ar c )(Ard ), or -L c -N-(Ar e )-L d -N-(Ar f )(Ar g ) represents; or R' and R'' may be joined together to form a ring, and R' and R'' may be the same or different from each other; L b and L c Each of these can be independently single-bonded, substituted, or unsubstituted (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; L d is either a substitution or a non-substitution (C6~C 30 ) represents arylene or substituted or unsubstituted (3-30 member) heteroarylene; Ar c ~Ar g These are, independently, substitution or non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C2~C 30 ) Alkenil, (C3~C 30 ) aliphatic ring and (C6~C 30 ) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C6~C 30 ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; Y1 and Y2 are independent of -N= and -NR a -, -O-, -S-, or -Se-, where either Y1 or Y2 is -N=, and the other Y1 or Y2 is -NR a Provided that it is -, -O-, -S-, or -Se-; R a is either a substitution or a non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; or may bond to an adjacent substituent to form a ring. Ar7 is either substituted or unsubstituted (C6~C 30 ) Represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; R 11 ~R 81 These are, independently, hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C) 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C3-C 30 )Cycloalkyl, substituted or unsubstituted (C1~C 30 ) Acoxidil, 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 ) Alkyl di(C6~C 30 ) Arylsilyl, substituted or unsubstituted tri(C6~C 30 ) Arylsilyl, (C3~C 30 ) aliphatic ring and (C6~C 30 ) A fused ring substituted or unsubstituted with an aromatic ring, or -N-(R b )(R c ) may represent; or may bond to an adjacent substituent to form a ring; R b and R c These are, independently, substitution or non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C2~C 30 ) Alkenyl, substituted or unsubstituted (C6~C 30 ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; R in each of equations 1-1 to 1-7 11 ~R 81 It is bonded to at least one of Ar1 to Ar3 in Equation 1.

[0033] According to one embodiment of the present disclosure, the compound represented by Formula 1 may be at least one selected from the following compounds, but is not limited thereto. [ka]

change

change

change

change

change

change

change

change

change

change

change

change

change

change

change

change

change

change

[0034] In one embodiment, the deuterium substitution rate in the deuterated compound within the compound is preferably 20% to 100%, more preferably 20% to 95%, even more preferably 30% to 95%, and even more preferably 40% to 95% of the total number of hydrogen atoms.

[0035] The compounds represented by Formula 1 according to this disclosure can be produced by referring to synthesis methods known to those skilled in the art, such as those disclosed in (Patent Document 2), (Patent Document 3), (Patent Document 4), (Patent Document 5), etc., but are not limited thereto.

[0036] In one embodiment, each of the first light-emitting layer and the second light-emitting layer contains a compound represented by formula 1 as the first host material, and at least one of the first light-emitting layer and the second light-emitting layer may contain a compound represented by the following formula 2 as the second host material. [ka]

[0037] In Equation 2, L4~L6 are each independently single bonds, substituted or unsubstituted (C1~C 30 ) Alkylene, substituted or unsubstituted (C6~C 30 ) Arylene, substituted or unsubstituted (3-30 member) heteroarylene, or substituted or unsubstituted (C3-C 30 ) Represents cycloalkylene; Ar4~Ar6 are each independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C3-C 30 )Cycloalkyl, substituted or unsubstituted (C1~C 30 ) Acoxidil, 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 ) Alkyl di(C6~C 30 ) Arylsilyl, substituted or unsubstituted tri(C6~C 30 ) Arylsilyl, (C3~C 30 ) aliphatic ring and (C6~C 30 ) A fused ring substituted or unsubstituted with an aromatic ring, or -L a -N(Ar a )(Ar b ) may represent; or may bond to an adjacent substituent to form a ring; L a This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; Ar a and Ar b These are, independently, hydrogen, substituted or unsubstituted (C1~C 30 ) alkyl, substituted or unsubstituted (C2~C 30 ) Alkenil, (C3~C 30 ) aliphatic ring and (C6~C 30) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C6~C 30 ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; However, this is conditional on the exclusion of cases where all L4-L6 are single bonds, while all Ar4-Ar6 are hydrogen atoms.

[0038] In one embodiment, L4 to L6 are each independently single bonds, substituted or unsubstituted (C6 to C 30 ) Arylene, or substituted or unsubstituted (3-30 member) heteroarylene, preferably L4-L6 each independently being a single bond, substituted or unsubstituted (C6-C 25 ) may be arylene, or a substituted or unsubstituted (3-25 member) heteroarylene. For example, L4-L6 may each independently be a single bond, a substituted or unsubstituted phenylene, a substituted or unsubstituted biphenylene, a substituted or unsubstituted naphthylene, a substituted or unsubstituted phenantrenylene, a substituted or unsubstituted pyridinylene, a substituted or unsubstituted dibenzofuranylene, a substituted or unsubstituted dibenzothiophenylene, a substituted or unsubstituted carbazoylene, or a substituted or unsubstituted phenanthroxazolylene. The substituents may be substituted with at least one selected from the group consisting of deuterium, phenyl, naphthyl, and dibenzofuranyl.

[0039] In one embodiment, Ar4 is substituted or unsubstituted (C6~C 30 ) may be an aryl or a substituted or unsubstituted (3-30 member) heteroaryl, preferably Ar4 is a substituted or unsubstituted (C6-C 25The substituent may be an aryl or a substituted or unsubstituted (3-25 member) heteroaryl. For example, Ar4 may be a substituted or unsubstituted phenantrenyl, a substituted or unsubstituted crisenyl, a substituted or unsubstituted benzophenantrenyl, a substituted or unsubstituted phenantroxazolyl, a substituted or unsubstituted phenantrothiazolyl, a substituted or unsubstituted benzonaphthofuranil, or a substituted or unsubstituted benzonaphthothiophenyl. The substituent may be substituted with at least one selected from the group consisting of phenyl, biphenyl, naphthyl, and pyridinyl.

[0040] In one embodiment, Ar5 and Ar6 are independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C3-C 30 )Cycloalkyl, tri(C6~C 30 ) Arylsilyl, substituted or unsubstituted mono- or di(C6~C 30 ) Arylamino, substituted or unsubstituted mono- or di(3-30 member) heteroarylamino, or substituted or unsubstituted (C6-C 30)Aryl (3-30 member) heteroarylamino, or can bond to adjacent substituents to form a ring. For example, Ar5 and Ar6 can independently be substituted or unsubstituted methyl, substituted or unsubstituted tert-butyl, substituted or unsubstituted phenyl, substituted or unsubstituted o-biphenyl, substituted or unsubstituted m-biphenyl, substituted or unsubstituted p-biphenyl, substituted or unsubstituted o-terphenyl, substituted or unsubstituted m-terphenyl, substituted or unsubstituted p-terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted o-quaterphenyl, substituted or unsubstituted phenantrenyl, substituted or unsubstituted anthracenyl, substituted or unsubstituted crisenyl, substituted or unsubstituted benzonaphthalenyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted benzofluorenyl, substituted or unsubstituted spirobifluorenyl, substituted or unsubstituted fluoranthenyl, or substituted or unsubstituted C 22 The aminos may be aryl, substituted or unsubstituted dibenzonaphthocycloheptanyl, substituted or unsubstituted pyridinyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted benzonaphthofuranyl, substituted or unsubstituted benzophenanthrofuranyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted benzonaphthothiophenyl, substituted or unsubstituted carbazolyl, substituted or unsubstituted benzophropyridinyl, substituted or unsubstituted dibenzoselenophenyl, substituted or unsubstituted benzonaphthoselenophenyl, substituted or unsubstituted benzimidazolyl, substituted or unsubstituted phenoxadinyl, substituted or unsubstituted triphenylsilyl, or unsubstituted or substituted with one or two substituents. The substituents may be substituted with at least one selected from the group consisting of deuterium, methyl, tert-butyl, phenyl, naphthyl, biphenyl, and pyridyl, in which case each substituted amino may be independently substituted with at least one selected from the group consisting of phenyl, biphenyl, naphthyl, pyridinyl, dibenzofuranyl, and dibenzothiophenyl. In addition, Ar5 and Ar6 may bond to each other to form a 5-20 membered polycyclic aromatic ring, for example, forming indolocarbazole.

[0041] In one embodiment of the present disclosure, at least one of Ar4 to Ar6 may be selected from the following formulas 2-1 to 2-6. [ka]

[0042] In equations 2-1 to 2-6, T represents -O-, -S-, -N(R)-, -C(R')(R")-, or -Se-; V represents -O- or -S-; R, R', and Re'' can each be independently substituted or not substituted (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, -L b -N-(Ar c )(Ar d ), or -L c -N-(Ar e )-L d -N-(Ar f )(Ar g ) represents; or R' and R'' may be joined together to form a ring, and R' and R'' may be the same or different from each other; L b and L c Each of these can be independently single-bonded, substituted, or unsubstituted (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; L d is either a substitution or a non-substitution (C6~C 30 ) represents arylene or substituted or unsubstituted (3-30 member) heteroarylene; Ar c ~Ar g These are, independently, substitution or non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C2~C 30 ) Alkenil, (C3~C 30 ) aliphatic ring and (C6~C 30) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C6~C 30 ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; Y1 and Y2 are independent of -N= and -NR a -, -O-, -S-, or -Se-; where at least one of Y1 and Y2 is -N= and the other of Y1 and Y2 is -NR a Provided that it is -, -O-, -S-, or -Se-; R a is either a substitution or a non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; or may bond to an adjacent substituent to form a ring; Ar7 is either substituted or unsubstituted (C6~C 30 ) Represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; R 11 ~R 56 and R 70 ~R 81 These are, independently, hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C) 30 ) alkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (3-30 member) 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 ) Alkyl di(C6~C 30 ) Arylsilyl, substituted or unsubstituted tri(C6~C 30 ) Arylsilyl, (C3~C 30 ) aliphatic ring and (C6~C 30 ) A fused ring substituted or unsubstituted with an aromatic ring, or -N-(R b )(Rc ) may represent; or may bond to an adjacent substituent to form a ring; R b and R c These are, independently, substitution or non-substitution (C1~C 30 ) alkyl, substituted or unsubstituted (C2~C 30 ) Alkenyl, substituted or unsubstituted (C6~C 30 ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; R in each of equations 2-1 to 2-6 11 ~R 56 , and R 70 ~R 81 It is bonded to at least one of Ar4 to Ar6 in Equation 2.

[0043] According to one embodiment of the present disclosure, the compound represented by Formula 2 may be at least one selected from the following compounds, but is not limited thereto. [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] (In the formula, D n (This means that n hydrogen atoms are replaced by deuterium, where n is an integer greater than or equal to 1, and the upper limit of n is determined by the number of hydrogen atoms in the non-deuterated compound.)

[0044] In one embodiment, the deuterium substitution rate in the deuterated compound within the compound is preferably 20% to 100%, more preferably 20% to 95%, even more preferably 30% to 95%, and even more preferably 40% to 95% of the total number of hydrogen atoms.

[0045] The compounds represented by Formula 2 according to this disclosure can be produced by referring to synthesis methods known to those skilled in the art, such as those disclosed in (Patent Document 6), (Patent Document 7), (Patent Document 8), etc., but are not limited thereto.

[0046] According to one embodiment, the first light-emitting layer and the second light-emitting layer each contain a compound represented by formula 1 as the first host compound and a compound represented by formula 2 as the second host compound.

[0047] In this case, either the first host material in the first light-emitting layer or the second host material in the second light-emitting layer may contain materials that are different from each other.

[0048] Furthermore, in the organic electroluminescent element, the first light-emitting layer further comprises a third host material, the second light-emitting layer further comprises a third host material, or both the first and second light-emitting layers further comprise a third host material.

[0049] In one embodiment, the organic electroluminescent element of the present disclosure further includes a third light-emitting layer.

[0050] The third light-emitting layer is positioned between the cathode and the second light-emitting layer and may be in direct contact with the second light-emitting layer.

[0051] In one embodiment, at least one of the first light-emitting layer and the second light-emitting layer contains a compound comprising at least one deuterium molecule.

[0052] This specification describes organic electroluminescent elements to which the aforementioned host materials are applied.

[0053] In the organic electroluminescent device of this disclosure, one of the first and second electrodes may be an anode and the other may be a cathode. In this case, the first and second electrodes may be formed as a transparent conductive material, a semi-transparent conductive material, or a reflective conductive material, respectively. In addition to the light-emitting layer, the organic layer may further include at least one layer selected from a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron transport layer, an electron injection layer, an intermediate layer, a hole blocking layer, an electron blocking layer, and an electron buffer layer.

[0054] The organic layer may further contain amine compounds and / or azine compounds other than the luminescent material according to this disclosure. Specifically, the hole injection layer, hole transport layer, hole auxiliary layer, luminescent layer, luminescent auxiliary layer, or electron blocking layer may contain amine compounds, such as arylamine compounds and styrylarylamine compounds, as hole injection material, hole transport material, hole auxiliary material, luminescent material, luminescent auxiliary material, or electron blocking material. Furthermore, the electron transport layer, electron injection layer, electron buffer layer, or hole blocking layer may contain azine compounds as electron transport material, electron injection material, electron buffer material, or hole blocking material. In addition, the organic layer may further contain at least one metal selected from the group consisting of metals of Group 1, Group 2, transition metals of Period 4, transition metals of Period 5, lanthanides, and organometallic d-transition elements or complex compounds containing such metals.

[0055] Multiple host materials according to one embodiment can be used as light-emitting materials for white organic light-emitting devices. It has been suggested that white organic light-emitting devices may have various structures, such as parallel side-by-side arrangement, stacking arrangement, or CCM (color conversion material) arrangement, depending on the arrangement of R (red), G (green), YG (yellow-green), or B (blue) light-emitting units. In addition, multiple host materials according to one embodiment can also be applied to organic electroluminescent devices containing QDs (quantum dots).

[0056] A hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof can be used between the anode and the light-emitting layer. The hole injection layer may be multilayered to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or electron blocking layer, in which case each layer may use two different compounds simultaneously. The hole injection layer may also be doped with a p-dopant. An electron blocking layer may also be placed between the hole transport layer (or hole injection layer) and the light-emitting layer to prevent electron overflow from the light-emitting layer, thereby confining excitons within the light-emitting layer and preventing light leakage. The hole transport layer or electron blocking layer may be multilayered, in which case each layer may use multiple compounds.

[0057] An electron buffer layer, hole blocking layer, electron transport layer, electron injection layer, or a combination thereof can be used between the light-emitting layer and the cathode. To control electron injection and improve the interfacial properties between the light-emitting layer and the electron injection layer, the electron buffer layer may be multilayered, in which case each layer may use two different compounds simultaneously. The hole blocking layer or electron transport layer may also be multilayered, in which case each layer may use multiple compounds. Furthermore, the electron injection layer may be doped with an n-dopant.

[0058] An auxiliary light-emitting layer may be placed between the anode and the light-emitting layer, or between the cathode and the light-emitting layer. When the auxiliary light-emitting layer is placed between the anode and the light-emitting layer, it can be used to promote hole injection and / or hole transport, or to prevent electron overflow. When the auxiliary light-emitting layer is placed between the cathode and the light-emitting layer, it can be used to promote electron injection and / or electron transport, or to prevent hole overflow. In addition, a hole auxiliary layer may be placed between a hole transport layer (or hole injection layer) and the light-emitting layer, which can be effective in promoting or blocking the hole transport rate (or hole injection rate), thereby making it possible to control the charge balance. If the organic electroluminescent element includes two or more hole transport layers, the further included hole transport layers can be used as hole auxiliary layers or electron blocking layers. The auxiliary light-emitting layer, hole auxiliary layer, or electron blocking layer may have the effect of improving the efficiency and / or lifetime of the organic electroluminescent element.

[0059] In the organic electroluminescent element of this disclosure, preferably, at least one layer selected from a chalcogenide layer, a metal halide layer, and a metal oxide layer (hereinafter referred to herein as the "surface layer") may be disposed on the inner surface of one or both of the electrode pairs. Specifically, a silicon and aluminum chalcogenide (including oxide) layer is preferably disposed on the anode surface of the electroluminescent medium layer, and a metal halide layer or metal oxide layer is preferably disposed on the cathode surface of the electroluminescent medium layer. Operational stability of the organic electroluminescent element can be obtained by the surface layer. Preferably, the chalcogenide is SiO X (1≦X≦2), AlO X Examples of metal halides (1≦X≦1.5) include SiON and SiAlON; examples of metal halides include LiF, MgF2, CaF2, and rare earth metal fluorides; and examples of metal oxides include Cs2O, Li2O, MgO, SrO, BaO, and CaO.

[0060] An organic electroluminescent element according to one embodiment of the present disclosure may be an organic electroluminescent element having a tandem structure. In the case of a tandem organic electroluminescent element according to one embodiment, a single light-emitting unit (light-emitting unit) may be formed in a structure in which two or more units are connected by a charge-generating layer. The organic electroluminescent element may include a plurality of two or more light-emitting units, for example, a plurality of three or more light-emitting units having a first electrode and a second electrode facing each other on a substrate, and a light-emitting layer stacked between the first electrode and the second electrode and emitting light in a specific wavelength range, in which case each light-emitting unit may include a hole transport band, a light-emitting layer, and an electron transport band, the hole transport band may include a hole injection layer and a hole transport layer, and the electron transport band may include an electron transport layer and an electron injection layer. According to one embodiment, three or more light-emitting layers may be included in a light-emitting unit. The plurality of light-emitting units may emit the same color or different colors. Furthermore, a single light-emitting unit may include one or more light-emitting layers, and these layers may be the same or different colors. This may include one or more charge-generating layers placed between each light-emitting unit. A charge-generating layer refers to a layer that generates holes and electrons when a voltage is applied. If there are three or more light-emitting units, charge-generating layers may be placed between each light-emitting unit. In this case, the charge-generating layers may be the same or different from each other. By placing charge-generating layers between light-emitting units, the current efficiency in each light-emitting unit is increased, and the charge can be distributed smoothly. Specifically, a charge-generating layer can be provided between two adjacent stacks and can help drive a tandem organic electroluminescent element using only anode-cathode pairs without separate internal electrodes placed between the stacks.

[0061] An organic electroluminescent element according to one embodiment may have two or more organic layers and further include one or more charge generating layers, in which case the charge generating layers may be placed between each of the organic layers, and if two or more organic layers are included, each of the charge generating layers may be the same or different from one another. Because the charge generating layers are placed between the organic layers, the organic electroluminescent element can be driven by only a pair of anodes and cathodes without separate internal electrodes placed between the organic layers.

[0062] The charge generation layer may consist of an N-type charge generation layer and a P-type charge generation layer. The N-type charge generation layer may be doped with alkali metals, alkaline earth metals, or compounds of alkali metals and alkaline earth metals. Alkali metals may include those selected from the group consisting of Li, Na, K, Rb, Cs, Fr, Yb, and combinations thereof, and alkaline earth metals may include those selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ra, and combinations thereof.

[0063] In addition, in the organic electroluminescent element of this 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, may be arranged on at least one surface of a pair of electrodes. In this case, the electron transport compound is reduced to anion, thereby facilitating the injection and transport of electrons from the mixed region into the electroluminescent medium. Furthermore, the hole transport compound is oxidized to a cation, thereby facilitating the injection and transport of holes from the mixed region into the electroluminescent medium. Preferably, 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. Also, to prepare an organic electroluminescent element having two or more light-emitting layers and emitting white light, a reducing dopant layer may be used as a charge-generating layer.

[0064] In one embodiment, both the first light-emitting layer and the second light-emitting layer are phosphorescent light-emitting layers.

[0065] In one embodiment, the first light-emitting layer and the second light-emitting layer may each contain the same phosphorescent dopant material.

[0066] In another embodiment, the first and second light-emitting layers may each contain different phosphorescent dopant materials.

[0067] The first and second light-emitting layers may further contain a phosphorescent dopant material in each layer. The first and second light-emitting layers may further contain a red phosphorescent dopant material in each layer, the first and second light-emitting layers may further contain a green phosphorescent dopant material in each layer, and the first and second light-emitting layers may further contain a blue phosphorescent dopant material in each layer.

[0068] With respect to the host compound of the luminescent layer, the doping concentration of the dopant compound may be less than 20% by weight, preferably less than 10% by weight.

[0069] The phosphorescent dopant material applied to the organic electroluminescent element of this disclosure is not particularly limited, but is preferably a metallized complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably an ortho-metallized complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably an ortho-metallized iridium complex compound.

[0070] The dopants included in the organic electroluminescent elements of this disclosure may be, but are not limited to, compounds represented by the following formulas 101 or 102. [ka]

[0071] In equations 101 and 102, L' has the following structure 1-3: [ka] One of the following will be selected; R 100 ~R 103 These are, independently, hydrogen, deuterium, halogen, unsubstituted or substituted with deuterium and / or halogen (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 )aryl, cyano, substituted or unsubstituted (3-30 member) heteroaryl, or substituted or unsubstituted (C1-C 30 ) may represent an alkoxy or bond to an adjacent substituent to form a ring, for example, a ring with pyridine, for example, a substituted or unsubstituted quinoline, a substituted or unsubstituted benzoflopyridine, a substituted or unsubstituted benzothienopyridine, a substituted or unsubstituted indenopyridine, a substituted or unsubstituted benzofloxoquinoline, a substituted or unsubstituted benzothienoquinoline, or a substituted or unsubstituted indenoquinoline; R 104 ~R 107 These are, independently, hydrogen, deuterium, halogen, unsubstituted or substituted with deuterium and / or halogen (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 )aryl, substituted or unsubstituted (3-30 member) heteroaryl, cyano, or substituted or unsubstituted (C1-C 30 ) may represent an alkoxy; or may bond to an adjacent substituent to form a substituted or unsubstituted ring, for example, a substituted or unsubstituted ring with benzene, for example, a substituted or unsubstituted naphthalene, a substituted or unsubstituted fluorene, a substituted or unsubstituted dibenzothiophene, a substituted or unsubstituted dibenzofuran, a substituted or unsubstituted indenopyridine, a substituted or unsubstituted benzoflopyridine, or a substituted or unsubstituted benzothienopyridine; R 201 ~R 220These are, independently, hydrogen, deuterium, halogen, unsubstituted or substituted with deuterium and / or halogen (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, or substituted or unsubstituted (C6~C 30 ) may represent an aryl group; or may bond to an adjacent substituent to form a substituted or unsubstituted ring, for example, a substituted or unsubstituted pentane, a substituted or unsubstituted propane, a substituted or unsubstituted isobutane, a substituted or unsubstituted 3-methylpentane, or a substituted or unsubstituted trifluoro-2-methylpropane; Z1 to Z3 each independently represent either N or CK1; Each K1 can be independently hydrogen, deuterium, halogen, unsubstituted or substituted with deuterium and / or halogen (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 )aryl, cyano, substituted or unsubstituted (3-30 member) heteroaryl, or substituted or unsubstituted (C1-C 30 ) may represent an alkoxy or bond to an adjacent substituent to form a ring, for example, a substituted or unsubstituted benzoquinazoline, a substituted or unsubstituted benzoquinoxaline, a substituted or unsubstituted quinoxaline, a substituted or unsubstituted benzothienopyrimidine, a substituted or unsubstituted benzothienopyridine, a substituted or unsubstituted thienopyridine, a substituted or unsubstituted thienopyrimidine, or a substituted or unsubstituted benzothienopyridazine; 's' represents an integer between 1 and 3.

[0072] Specifically, concrete examples of dopant compounds include, but are not limited to, the following. [ka] [ka] [ka] [ka] [ka] [ka]

[0073] To form each layer of the organic electroluminescent element of this disclosure, dry deposition methods such as vacuum evaporation, sputtering, plasma deposition, and ion plating, or wet deposition methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating can be used. When using a wet deposition method, the thin film can be formed by dissolving or dispersing the material forming each layer in any suitable solvent such as ethanol, chloroform, tetrahydrofuran, or dioxane. The solvent can be any solvent that can dissolve or diffuse the material forming each layer and does not have problems with film formation ability.

[0074] According to one embodiment, when the first host material and the second host material are present in the same or different layers of an organic electroluminescent element, the two host materials can be deposited separately. For example, the second host material can be deposited after the first host material has been deposited.

[0075] According to one embodiment, when each layer of an organic electroluminescent element is formed, the film may be formed by the method described above, and the film may be formed by a co-evaporation process, a mixed evaporation process, and / or a process using both a co-evaporation process and a mixed evaporation process. For example, co-evaporation may be a method of depositing two or more isomer materials by placing isomer materials in each individual evaporation source, e.g., a crucible source, and evaporating the materials by simultaneously passing an electric current through two cells. In addition, for example, mixed evaporation may be a method of mixing two or more isomer materials in one evaporation source, e.g., a crucible source, before deposition, and then evaporating the materials by passing an electric current through one cell. In addition, for example, a process using co-evaporation and mixed evaporation may be a process of mixing a first host material and a second host material in one evaporation source, e.g., a crucible source, placing another material in another evaporation source, e.g., a crucible source, and then evaporating and depositing each material by simultaneously passing an electric current through two cells. When a film is formed using a process that combines mixed deposition and / or co-deposition with mixed deposition, the number of evaporation sources used can be reduced.

[0076] According to one embodiment, the disclosure may provide a compound obtained by depositing an organic layer in a manufacturing process for an organic electroluminescent element, and then recovering and purifying the material of the organic layer attached to the deposition apparatus. The recovered compound may be subjected to a purification process and / or a recrystallization process, and the purity of the purified and / or recrystallized compound obtained therefrom may be 99.9% or higher.

[0077] According to one embodiment, the present disclosure provides a method for recovering a plurality of host materials, comprising: depositing a plurality of host materials comprising at least one first host material containing a compound represented by formula 1 and at least one second host material containing a compound represented by formula 2; recovering the plurality of host materials attached to a deposition apparatus; and purifying and / or recrystallizing the recovered plurality of host materials to obtain a plurality of host materials having a purity of 99.9% or higher.

[0078] According to one embodiment, the present disclosure can provide a display device such as a smartphone, tablet, notebook computer, PC, TV, or vehicle display device, or a lighting device such as an outdoor or indoor lighting device, by using a plurality of host materials comprising a compound represented by Formula 1 and a compound represented by Formula 2. [Examples]

[0079] In this specification, the method for preparing an organic electroluminescent device including multiple light-emitting layers according to the present disclosure and the device characteristics thereof will be described below for a detailed understanding of the present disclosure.

[0080] [Element Examples 1-16] Preparation of an OLED comprising a plurality of light-emitting layers, each containing a plurality of hosts on which a compound has been deposited according to the present disclosure. An OLED was manufactured according to this disclosure. First, a transparent electrode indium tin oxide (ITO) thin film (10 Ω / sq) (Geomatec Co., Ltd., Japan) on a glass substrate for OLEDs was sequentially subjected to ultrasonic cleaning with acetone and isopropyl alcohol, then stored in isopropyl alcohol, and then used. Subsequently, the ITO substrate was mounted on a substrate holder of a vacuum deposition apparatus. Next, compound HI-1 was introduced into a cell of the vacuum 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 with a doping amount of 3 wt% based on the total amount of compounds HI-1 and HT-1 to form a hole injection layer with a thickness of 10 nm. Next, compound HT-1 was deposited on the hole injection layer to form a first hole transport layer with a thickness of 80 nm. Next, compound HT-2 was introduced into another cell of the vacuum deposition apparatus, and evaporated by passing an electric current through the cell, thereby forming a second hole transport layer with a thickness of 60 nm on the first hole transport layer. After the formation of the hole injection layer and hole transport layer, the light-emitting layer was formed on top of them as follows: The first and second host compounds listed in Table 1 below were introduced as hosts into two cells of a vacuum deposition apparatus, and compound D-39 was introduced as the first dopant into another cell. Next, the two host materials were evaporated in a 50:50 weight ratio, and simultaneously, the dopant material was evaporated at different rates, and the dopant was deposited with a doping amount of 3 wt% based on the total amount of host and dopant to form a first light-emitting layer with a thickness of 20 nm on the second hole transport layer. Next, the third and fourth host compounds listed in Table 1 below were introduced into two cells, and compound D-39 was introduced as the second dopant into another cell. Next, two host materials were evaporated in a 50:50 ratio, and simultaneously, dopant materials were evaporated at different rates. The dopant was deposited at a doping amount of 3% by weight relative to the total amount of host and dopant, forming a light-emitting layer with a thickness of 20 nm on the first light-emitting layer. Then, compounds ET-1 and EI-1 as electron transport materials were deposited in a 50:50 weight ratio to form an electron transport layer with a thickness of 35 nm on the light-emitting layer.After depositing compound EI-1 as an electron injection layer with a thickness of 2 nm on the electron transport layer, an Al cathode with a thickness of 80 nm was deposited on the electron injection layer using a separate vacuum deposition apparatus. In this way, an OLED was manufactured. All materials used to manufacture the OLED were 10. -6 It was purified by vacuum sublimation using a Thor's IV line.

[0081] The driving voltage, current efficiency, and luminescence color of the OLEDs of Examples 1 to 16 manufactured as described above, at a brightness of 1,000 nits, and the time required for the brightness to decay from an initial brightness of 100% to 90% under a constant current corresponding to 10,000 nits (lifetime: T) are described above. 90 The following measurements were taken. The results are shown in Table 1 below.

[0082] [Table 1]

[0083] [Table 2]

[0084] [Element Examples 17 and 18] Preparation of OLEDs by co-evaporation of a first host compound and a second host compound according to the present disclosure An OLED was manufactured in the same manner as in Element Example 1, except that the host compound and dopant compound listed in Table 2 were used and their respective light-emitting layers were formed by deposition.

[0085] The driving voltage, current efficiency, and luminescence color of the OLEDs of the element examples 17 and 18 manufactured as described above, at a brightness of 1,000 nits, and the time required for the brightness to decay from an initial brightness of 100% to 90% under a constant current corresponding to 10,000 nits (lifetime: T) are as follows: 90 The following measurements were taken. The results are shown in Table 2 below.

[0086] [Table 3]

[0087] [Element Examples 19 and 20] Preparation of OLEDs by co-evaporation of a first host compound and a second host compound according to the present disclosure An OLED was manufactured in the same manner as in Element Example 1, except that compound HT-3 was deposited to a thickness of 55 nm as a second hole transport layer instead of compound HT-2, compound HT-4 was deposited on top of it to a thickness of 5 nm as a third hole transport layer, and the host compounds and dopant compounds listed in Table 3 below were used as hosts for the light-emitting layers and deposited to form the respective light-emitting layers, compound ET-2 was deposited to a thickness of 5 nm as an electron buffer layer, and then compound ET-3 and compound EI-1 were deposited to a thickness of 30 nm in a weight ratio of 50:50 as electron transport materials.

[0088] The driving voltage, current efficiency, and luminescence color of the OLEDs of the element examples 19 and 20 manufactured as described above, at a brightness of 1,000 nits, and the time required for the brightness to decay from an initial brightness of 100% to 90% under a constant current corresponding to 10,000 nits (lifetime: T) are as follows: 90 The following measurements were taken. The results are shown in Table 3 below.

[0089] [Table 4]

[0090] [Element Examples 21-32] Preparation of OLEDs by co-evaporation of a first host compound and a second host compound according to the present disclosure An OLED was manufactured in the same manner as in Device Example 19, except that the host shown in Table 4 below was used as the host for the light-emitting layer, and compound D-162 was used as the first and second dopant to deposit the respective light-emitting layers.

[0091] The driving voltage and current efficiency at a luminance of 1,000 nits of the OLEDs of Element Examples 21 to 32 manufactured as described above were measured. The results are shown in Table 4 below. In addition, the time (lifetime: T 95 ) required for the luminance to decay from the initial luminance of 100% to 95% under a constant current corresponding to 10,000 nits was measured. The results are also shown in Table 4 below.

[0092]

Table 5

[0093]

Table 6

[0094] [Element Comparative Example 1] Preparation of an OLED Containing a Plurality of Light-Emitting Layers Composed of a Single Host Compound The OLEDs were manufactured in the same manner as in Element Example 1, except that the host compounds in Table 5 below were used as the host for the light-emitting layer and were vapor-deposited as a single host on each light-emitting layer.

[0095]

Table 7

[0096] From Tables 1 to 5 above, it can be confirmed that the organic electroluminescent device containing a plurality of host materials or a plurality of host materials and dopant materials in a plurality of light-emitting layers according to the present disclosure exhibits significantly improved characteristics from the viewpoints of driving voltage, current efficiency, and lifetime as compared with conventional devices.

[0097] The compounds used in the above Element Examples and Element Comparative Examples are specifically listed in Table 6 below.

[0098]

Table 8

[0099] Table 9

[0100] Table 10

Claims

1. An organic electroluminescent element comprising an anode; a cathode; and an organic material layer disposed between the anode and the cathode, The organic material layer includes two or more light-emitting layers provided between the anode and the cathode, The two or more light-emitting layers include a first light-emitting layer between the anode and the cathode, and a second light-emitting layer disposed between the first light-emitting layer and the cathode. The first light-emitting layer and the second light-emitting layer are in direct contact with each other. At least one of the first light-emitting layer and the second light-emitting layer comprises a plurality of host materials. Organic electroluminescent element.

2. The first light-emitting layer and the second light-emitting layer each have the following formula 1 as the first host material: 【Chemistry 1】 [In the formula, X １ ~X ３ These are, independently, -N = or -C(R １ ) represents =, however, X １ ~X ３ Provided that at least one of them is N; R １ represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C １ ~C ３０ alkyl), substituted or unsubstituted (C ６ ~C ３０ aryl), substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C ３ ~C ３０ cycloalkyl), substituted or unsubstituted (C １ ~C ３０ alkoxy), substituted or unsubstituted tri(C １ ~C ３０ alkyl)silyl, substituted or unsubstituted di(C １ ~C ３０ alkyl)(C ６ ~C ３０ aryl)silyl, substituted or unsubstituted (C １ ~C ３０ alkyl)di(C ６ ~C ３０ aryl)silyl, substituted or unsubstituted tri(C ６ ~C ３０ aryl)silyl, or a substituted or unsubstituted condensed ring of an (C ３ ~C ３０ aliphatic ring) and an (C ６ ~C ３０ aromatic ring); L １ ~L ３ Each of these can be independently a single bond, a substitution, or an unsubstituted (C) ６ ~C ３０ ) Arylene, substituted or unsubstituted (C ３ ~C ３０ ) represents a cycloalkylene, or a substituted or unsubstituted (3-30 member) heteroarylene; Ar １ ~Ar ３ Each is independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C) １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C １ ~C ３０ ) alkoxy, substituted or unsubstituted tri(C １ ~C ３０ ) alkylsilyl, substituted or unsubstituted di(C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted (C １ ~C ３０ ) Alkyl di(C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted tri(C ６ ~C ３０ ) Aryl silyl, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring substituted or unsubstituted with an aromatic ring, or *-N-(R ２ ) (Caution ３ ) represents; or may bond to an adjacent substituent to form a ring, provided that Ar １ ~Ar ３ At least one of them is either substituted or non-substituted (C ６ ~C ３０ ) provided that it is an aryl or substituted or unsubstituted (3-30 member) heteroaryl; R ２ and R ３ These are, independently, substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenyl, substituted or unsubstituted (C ６ ~C ３０ [Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl.] The organic electroluminescent element according to claim 1, comprising a compound represented by [the compound].

3. At least one of the first light-emitting layer and the second light-emitting layer is a second host material, and the following formula 2: 【Chemistry 2】 [In the formula, L ４ ~L ６ Each of these can be independently a single bond, a substitution, or an unsubstituted (C) １ ~C ３０ ) Alkylene, substituted or unsubstituted (C ６ ~C ３０ ) Arylene, substituted or unsubstituted (3-30 member) heteroarylene, or substituted or unsubstituted (C ３ ~C ３０ ) Represents cycloalkylene; Ar ４ ~Ar ６ each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C １ ~C ３０ )-alkyl, substituted or unsubstituted (C ６ ~C ３０ )-aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C ３ ~C ３０ )-cycloalkyl, substituted or unsubstituted (C １ ~C ３０ )-alkoxy, substituted or unsubstituted tri(C １ ~C ３０ )-alkylsilyl, substituted or unsubstituted di(C １ ~C ３０ )-alkyl(C ６ ~C ３０ )-arylsilyl, substituted or unsubstituted (C １ ~C ３０ )-alkyldi(C ６ ~C ３０ )-arylsilyl, substituted or unsubstituted tri(C ６ ~C ３０ )-arylsilyl, (C ３ ~C ３０ )-aliphatic ring and (C ６ ~C ３０ )-aromatic ring of a substituted or unsubstituted fused ring, or -L ａ -N(Ar ａ )(Ar ｂ ); or may combine with adjacent substituents to form a ring; L ａ This is a single bond, substitution, or non-substitution (C ６ ~C ３０ ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; Ar ａ and Ar ｂ These are, independently, hydrogen, substituted or unsubstituted (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenil, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C ６ ~C ３０ ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; However, L ４ ~L ６ All of them are single bonds, while Ar ４ ~Ar ６ [Condition: If all of them are hydrogen, they are excluded.] The organic electroluminescent element according to claim 2, comprising a compound represented by [the formula shown].

4. The organic electroluminescent element according to claim 3, wherein each of the first light-emitting layer and the second light-emitting layer includes a compound represented by formula 1 as a first host material and a compound represented by formula 2 as a second host material.

5. The substituents in the substituted alkyl, substituted alkylene, substituted alkenyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted cycloalkyl, substituted cycloalkylene, substituted alkoxy, substituted trialkylsilyl, substituted dialkylarylsilyl, substituted alkyldiarylsilyl, substituted triarylsilyl, and the substituents in the substituted condensed rings of an aliphatic ring and an aromatic ring are, independently, deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; phosphine oxide; (C １ ~C ３０ ) alkyl; halo (C １ ~C ３０ ) alkyl; unsubstituted or at least one (C ６ ~C ３０ ) Replaced with aryl (C ２ ~C ３０ ) Alkenil; (C ２ ~C ３０ ) Alkinyl; (C １ ~C ３０ ) Acoxi; (C １ ~C ３０ ) alkylthio; (C ３ ~C ３０ ) Cycloalkyl; (C ３ ~C ３０ ) Cycloalkenyl; (3-7 member) heterocycloalkyl; (C ６ ~C ３０ ) Aryloxy; (C ６ ~C ３０ ) Arylthio; unsubstituted or at least one (C ６ ~C ３０ ) aryl-substituted (3-30 member) heteroaryls; unsubstituted or (C １ ~C ３０ (C) Substituted with at least one alkyl and (3-30 membered) heteroaryl ６ ~C ３０ ) Ariel; Tori (C １ ~C ３０ ) Alkylsilyl; tri(C ６ ~C ３０ ) Aryl silyl; di(C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylsilyl; (C １ ~C ３０ ) Alkyl di(C ６ ~C ３０ ) Arylsilyl; (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A condensed ring with an aromatic ring; amino; mono- or di(C) １ ~C ３０ ) Alkylamino; mono- or di(C ２ ~C ３０ ) Alkenylamino; substituted or unsubstituted mono- or di(C) ６ ~ ３０ ) Arylamino; mono- or di(3-30 member) heteroarylamino; (C １ ~C ３０ ) Alkyl (C ２ ~C ３０ ) Alkenylamino; (C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylamino; (C １ ~C ３０ ) alkyl (3-30 member) heteroarylamino; (C ２ ~C ３０ ) Alkenil (C ６ ~C ３０ ) Arylamino; (C ２ ~C ３０ ) Alkenyl (3-30 member) heteroarylamino; (C ６ ~C ３０ ) Aryl (3-30 member) heteroarylamino; (C １ ~C ３０ ) alkylcarbonyl; (C １ ~C ３０ ) Acoxycarbonyl; (C ６ ~C ３０ ) Arylcarbonyl; di(C ６ ~C ３０ ) Arylboronyl; di(C １ ~C ３０ ) alkylboronyl; (C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylboronyl; (C ６ ~C ３０ )ar(C １ ~C ３０ ) alkyl; and (C １ ~C ３０ ) Alkyl (C ６ ~C ３０ The organic electroluminescent element according to claim 1, wherein the element is at least one selected from the group consisting of aryls.

6. The organic electroluminescent element according to claim 1, further comprising a third light-emitting layer.

7. The organic electroluminescent element according to claim 6, wherein the third light-emitting layer is disposed between the cathode and the second light-emitting layer and is in direct contact with the second light-emitting layer.

8. The organic electroluminescent element according to claim 4, wherein one of the first host material or the one of the second host material in the first light-emitting layer and the second light-emitting layer is made of a different material from the other.

9. Ar in Equation 1 １ ~Ar ３ At least one of them is given by the following equations 1-1 to 1-7: 【Transformation 3】 [In the formula, T represents -O-, -S-, -N(R)-, -C(R')(R'')-, or -Se-; V represents -O- or -S-; R, R', and R'' are each independently substituted or non-substituted (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, -L ｂ -N-(Ar ｃ ) (Ar ｄ ), or -L ｃ -N-(Ar ｅ )-L ｄ -N-(Ar ｆ ) (Ar ｇ ) represents; or R' and R'' are joined together to form a ring, and R' and R'' may be the same or different from each other; L ｂ and L ｃ Each of these can be independently a single bond, a substitution, or an unsubstituted (C) ６ ~C ３０ ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; L ｄ is either substitution or non-substitution (C ６ ~C ３０ ) represents arylene or substituted or unsubstituted (3-30 member) heteroarylene; Ar ｃ ~Ar ｇ These are, independently, substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenil, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C ６ ~C ３０ ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; Y １ and Y ２ These are independently -N= and -NR ａ -, -O-, -S-, or -Se-, however, Y １ and Y ２ One of the following is -N=, Y １ and Y ２ The other is -NR ａ Provided that it is -, -O-, -S-, or -Se-; R ａ is either substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Represents an aryl, or a substituted or unsubstituted (3-30 membered) heteroaryl, or may be bonded to an adjacent substituent to form a ring; Ar ７ is either substitution or non-substitution (C ６ ~C ３０ ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; R １１ ~R ８１ Each is independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C) １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C １ ~C ３０ ) alkoxy, substituted or unsubstituted tri(C １ ~C ３０ ) alkylsilyl, substituted or unsubstituted di(C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted (C １ ~C ３０ ) Alkyl di(C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted tri(C ６ ~C ３０ ) Aryl silyl, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring substituted or unsubstituted with an aromatic ring, or -N-(R ｂ ) (Caution ｃ ) may represent or bond to adjacent substituents to form a ring; R ｂ and R ｃ These are, independently, substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenyl, substituted or unsubstituted (C ６ ~C ３０ ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; R in each of equations 1-1 to 1-7 １１ ~R ８１ In equation 1, Ar １ ~Ar ３ [Combined with at least one of the following] An organic electroluminescent element according to claim 2, selected from the above.

10. Ar in Equation 2 ４ ~Ar ６ At least one of them is given by the following equations 2-1 to 2-6: 【Chemistry 4】 [In the formula, T represents -O-, -S-, -N(R)-, -C(R')(R'')-, or -Se-; V represents -O- or -S-; R, R', and R'' are each independently substituted or non-substituted (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, -L ｂ -N-(Ar ｃ ) (Ar ｄ ), or -L ｃ -N-(Ar ｅ )-L ｄ -N-(Ar ｆ ) (Ar ｇ ) represents; or R' and R'' may be joined together to form a ring, and R' and R'' may be the same or different from each other; L ｂ and L ｃ Each of these can be independently a single bond, a substitution, or an unsubstituted (C) ６ ~C ３０ ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; L ｄ is either substitution or non-substitution (C ６ ~C ３０ ) represents arylene or substituted or unsubstituted (3-30 member) heteroarylene; Ar ｃ ~Ar ｇ These are, independently, substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenil, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring that is substituted or unsubstituted with an aromatic ring, substituted or unsubstituted (C ６ ~C ３０ ) Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl: Y １ and Y ２ These are independently -N= and -NR ａ -, -O-, -S-, or -Se-, however, Y １ and Y ２ One of the following is -N=, Y １ and Y ２ The other is -NR ａ Provided that it is -, -O-, -S-, or -Se-; R ａ is either substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Represents an aryl, or a substituted or unsubstituted (3-30 membered) heteroaryl; or may bond to an adjacent substituent to form a ring; Ar ７ is either substitution or non-substitution (C ６ ~C ３０ ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; R １１ ~R ５６ and R ７０ ~R ８１ Each is independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C) １ ~C ３０ ) alkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (3-30 member) heteroaryl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C １ ~C ３０ ) alkoxy, substituted or unsubstituted tri(C １ ~C ３０ ) alkylsilyl, substituted or unsubstituted di(C １ ~C ３０ ) Alkyl (C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted (C １ ~C ３０ ) Alkyl di(C ６ ~C ３０ ) Arylsilyl, substituted or unsubstituted tri(C ６ ~C ３０ ) Aryl silyl, (C ３ ~C ３０ ) Aliphatic rings and (C ６ ~C ３０ ) A fused ring substituted or unsubstituted with an aromatic ring, or -N-(R ｂ ) (Caution ｃ ) may represent; or may bond to adjacent substituents to form a ring; R ｂ and R ｃ These are, independently, substitution or non-substitution (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ２ ~C ３０ ) Alkenyl, substituted or unsubstituted (C ６ ~C ３０ ) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl; R in each of equations 2-1 to 2-6 １１ ~R ５６ and R ７０ ~R ８１ In equation 2, Ar ４ ~Ar ６ [Combined with at least one of the following] An organic electroluminescent element according to claim 3, selected from the above.

11. The compound represented by formula 1 is the following compound: 【Transformation 5】 【Transformation 6】 【Transformation 7】 【Transformation 8】 【Chemistry 9】 【Chemistry 10】 【Chemistry 11】 【Chemistry 12】 【Chemistry 13】 【Chemistry 14】 【Chemistry 15】 【Chemistry 16】 【Chemistry 17】 [Chemistry 18] 【Chemistry 19】 【Chemistry 20】 【Chemistry 21】 【Chemistry 22】 【Chemistry 23】 【Chemistry 24】 【Chemistry 25】 【Chemistry 26】 【Chemistry 27】 【Chemistry 28】 【Chemistry 29】 【Transformation 30】 (In the formula, D ｎ This indicates that n hydrogen atoms are replaced by deuterium, where n is an integer between 1 and the total number of hydrogen atoms present in the non-deuterated compound. An organic electroluminescent element according to claim 2, which is at least one selected from the above.

12. The compound represented by formula 2 is the following compound: 【Chemistry 31】 【Chemistry 32】 【Transformation 33】 【Transformation 34】 【Chemistry 35】 【Transformation 36】 【Chemistry 37】 【Transformation 38】 【Chemistry 39】 【Chemistry 40】 【Chemistry 41】 【Chemistry 42】 【Chemistry 43】 【Chemistry 44】 【Chemistry 45】 【Chemistry 46】 (In the formula, D ｎ This indicates that n hydrogen atoms are replaced by deuterium, where n is an integer between 1 and the total number of hydrogen atoms present in the non-deuterated compound. An organic electroluminescent element according to claim 3, which is at least one selected from the above.

13. The organic electroluminescent element according to claim 4, wherein the first light-emitting layer further comprises a third host material, the second light-emitting layer further comprises a third host material, or both the first light-emitting layer and the second light-emitting layer further comprise a third host material.

14. The organic electroluminescent element according to claim 1, wherein both the first light-emitting layer and the second light-emitting layer are phosphorescent light-emitting layers.

15. The organic electroluminescent element according to claim 1, wherein at least one of the first light-emitting layer and the second light-emitting layer comprises a compound containing at least one deuterium atom.

16. The organic electroluminescent element according to claim 1, wherein each of the first light-emitting layer and the second light-emitting layer further comprises a phosphorescent dopant material.

17. The organic electroluminescent element according to claim 16, wherein each of the first light-emitting layer and the second light-emitting layer further comprises the same phosphorescent dopant material.

18. The organic electroluminescent element according to claim 16, wherein each of the first light-emitting layer and the second light-emitting layer further comprises a phosphorescent dopant material different from the other.

19. The organic electroluminescent element according to claim 1, wherein each of the first light-emitting layer and the second light-emitting layer further comprises a red phosphorescent dopant material.

20. The organic electroluminescent element according to claim 1, wherein each of the first light-emitting layer and the second light-emitting layer further comprises a green phosphorescent dopant material.

21. The organic electroluminescent element according to claim 1, wherein each of the first light-emitting layer and the second light-emitting layer further comprises a blue phosphorescent dopant material.

22. The first light-emitting layer and the second light-emitting layer have a thickness ratio in the range of 1:9 to 9:

1. The organic electroluminescent element according to claim 1.

23. The organic electroluminescent element according to claim 4, wherein the ratio of the plurality of host materials in the first light-emitting layer and the second light-emitting layer is such that the ratio of the first host material to the second host material is in the range of 1:9 to 9:1, independently in each layer.

Images