Multiple host materials, organic electroluminescent compounds, and organic electroluminescent elements containing the same.

Abstract

The present invention provides multiple host materials, organic electroluminescent compounds, and organic electroluminescent elements containing the same. [Solution] This disclosure relates to a plurality of host materials, an organic electroluminescent compound, and an organic electroluminescent element comprising the same. By including a specific combination of the compounds according to this disclosure as a plurality of host materials, or by including the compounds according to this disclosure, it is possible to provide an organic electroluminescent element having improved lifetime characteristics compared to conventional organic electroluminescent elements.

Description

[Technical Field]

[0001] This disclosure relates to organic electroluminescent compounds, a plurality of host materials, and organic electroluminescent devices comprising the same. [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 rapidly, and OLEDs have been commercialized. Currently, OLEDs mainly use phosphorescent materials that have excellent luminescence efficiency in panel mounting. In many applications, such as TVs and lighting, OLEDs face the problem of insufficient lifespan, and high OLED efficiency is still required. Generally, the higher the brightness of an OLED, the shorter its lifespan. Therefore, OLEDs with high luminescence efficiency and / or long lifespan are needed for long-term display use and high resolution.

[0003] Various materials or concepts have been proposed for the organic layer of organic electroluminescent elements to improve luminous efficiency, drive voltage, and / or lifetime. However, these have not been satisfactory in practical applications. Therefore, there is a continuing need to develop organic electroluminescent elements with improved performance compared to previously disclosed elements, such as improved drive voltage, luminous efficiency, power efficiency, and / or lifetime characteristics.

[0004] Patent Documents 1, 2, and 3 disclose organic electroluminescent compounds having an anthracene structure and organic electroluminescent elements using the same, or organic light-emitting media containing specific diaminopyrene derivatives and specific anthracene derivatives. However, they do not disclose organic electroluminescent elements having improved performance due to the inclusion of specific combinations of multiple host materials and organic electroluminescent compounds claimed in this disclosure. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Korean Patent Application Publication No. 2008-0015953 Specification [Patent Document 2] Korean Patent Application Publication No. 2006-0108642 Specification [Patent Document 3] Korean Patent Application Publication No. 2010-0121489 Specification [Patent Document 4] Korean Patent Application Publication No. 2021-0046437 Specification [Patent Document 5] Korean Patent Application Publication No. 2022-0012180 Specification [Patent Document 6] Korean Patent Application Publication No. 2012-0101029 Specification [Patent Document 7] Korean Patent No. 10-2283849 Specification [Patent Document 8] Korean Patent No. 10-1427457 Specification [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The primary object of this disclosure is to provide a plurality of host materials capable of producing organic electroluminescent elements having low drive voltage and / or high luminous efficiency and / or long lifetime characteristics, and secondly, to provide an organic electroluminescent element comprising a plurality of host materials. Another object of this disclosure is to provide an organic electroluminescent compound having a novel structure suitable for application in organic electroluminescent elements. [Means for solving the problem]

[0007] As a result of intensive research to solve the technical challenges, the inventors have found that the above-mentioned objective can be achieved by a plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following formula 1, the second host compound is represented by the following formula 2, and the first and second host materials are different from each other, thereby completing the present invention. [ka]

[0008] In Equation 1 Ar1 is either substituted or unsubstituted (C6~C 30 ) Represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; L1 is a single bond, or substituted or unsubstituted (C6~C 30 ) Represents arrine; R1 to R8 each independently represent either hydrogen or deuterium; L2 is either substituted or non-substituted (C6~C 30 ) Represents arrine; Ar2 is given by the following equation 1-1: [ka] (In formula 1-1, R'1~R' 10each independently represents hydrogen, deuterium, or unsubstituted or deuterium-substituted (C6-C 30 ) aryl, and one of R’1 to R’ 10 is bonded to L2) is represented by;

Chemical Formula

[0009] In Formula 2, Ar 11 represents substituted or unsubstituted (C6-C 30 ) aryl or substituted or unsubstituted (3- to 30-membered) heteroaryl; L 11 represents a single bond, substituted or unsubstituted (C6-C 30 ) arylene, or substituted or unsubstituted (3- to 30-membered) heteroarylene; ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

[0010] In addition, as a result of intensive research to solve the above technical problems, the inventors have found that the aforementioned objectives can be achieved by an organic electroluminescent compound represented by the following formula 1-a, and an organic electroluminescent element containing the same, thereby completing the present invention. [ka]

[0011] In equation 1-a, R 50 ~R 61 Each of these independently represents hydrogen, deuterium, the following formula 1-b, or the following formula 1-c, provided that R 50 ~R 61 At least one of the following is equation 1-b or equation 1-c: [ka] (In formulas 1-b and 1-c, R 62 ~R 65 and R 68 Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R 62 ~R 65 and R 68 At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl; R 66 and R 67 Each of these independently represents either hydrogen or deuterium; R 69 ~R 75 Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R 69 ~R 75At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl. The condition is that it represents [something].

[0012] Furthermore, as a result of intensive research to solve the above technical problems, the inventors have found that the aforementioned objectives can be achieved by an organic electroluminescent compound represented by the following formula 2-a, and an organic electroluminescent element containing the same, thereby completing the present invention. [ka]

[0013] In equation 2-a, Ar 11 is either a substitution or a non-substitution (C6~C 30 ) Represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; L 11 This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; R 11 ~R 18 Each of these independently represents either hydrogen or deuterium; L 12 This is a single bond or a substituted or unsubstituted bond (C6~C 30 ) Represents arrine; Ar 12 This is the following equation 2-b: [ka] (In formula 2-b, X is either O or S; R' 11 ~R' 18 These are, independently, hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C) 30 ) alkyl, substituted or unsubstituted (C3~C 30)Cycloalkyl, substituted or unsubstituted (C6~C 30 ) Represents an aryl or a combination thereof; or may bond with adjacent substituents to form a ring; R' 11 ~R' 13 One of them is L 12 It is connected; L 12 R' is not coupled 11 ~R' 13 The remainder and R' 14 ~R' 18 At least one of them is either substituted or non-substituted (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (C6~C 30 (A heteroaryl compound, or a combination thereof) It is represented as follows. [Modes for carrying out the invention]

[0014] Advantageous effects of the invention By using multiple host materials or organic electroluminescent compounds according to this disclosure, it is possible to manufacture organic electroluminescent elements having low drive voltage and / or high luminescence efficiency and / or long lifetime characteristics.

[0015] Embodiments of the Invention This specification provides a detailed description of the Disclosure. However, the following description is intended to illustrate the Disclosure and is not intended to limit its scope.

[0016] In this disclosure, "organic electroluminescent compound" refers to a compound that can be used in an organic electroluminescent element and, if necessary, can be included in any layer constituting the organic electroluminescent element.

[0017] In this disclosure, “organic electroluminescent material” refers to a material that can be used in an organic electroluminescent device and may contain at least one compound. The organic electroluminescent material may, if necessary, be included in any layer constituting the organic electroluminescent device. 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 a host material and a dopant material), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc.

[0018] In this disclosure, “multiple host materials” refers to host materials comprising a combination of at least two compounds that may be included in any light-emitting layer constituting an organic electroluminescent element. It may mean both materials before (e.g., before deposition) and materials after (e.g., after deposition) the organic electroluminescent element. For example, the multiple host materials in this disclosure may be a combination of at least two host materials and may optionally further include conventional materials included in organic electroluminescent materials. The at least two compounds included in the multiple host materials in this disclosure may be included together in one light-emitting layer or each in different light-emitting layers. For example, the at least two host materials may be evaporated together or co-evaporated, or evaporated individually.

[0019] 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 10, more preferably 1 to 6. The above alkyls may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc. 30"(C6-C) cycloalkyl" 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. "(3-7 member) heterocycloalkyl" means a cycloalkyl having 3 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 from the group consisting of O, S, and N. The above heterocycloalkyls may include tetrahydrofuran, pyrrolidine, thiolane, tetrahydropyran, etc. "(C6-C) 30 )aryl" and "(C6~C 30"Arylene" means a monocyclic or fused ring group derived from an aromatic hydrocarbon having 6 to 30 carbon atoms in its ring skeleton, and may be partially saturated. The above aryl, arylene, and arenetriyl may include those having a spiro structure. Examples of the above-mentioned aryls include phenyl, biphenyl, terphenyl, quinquiphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, diphenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenantrenyl, phenylphenantrenyl, benzophenantrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perilenyl, crisenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, spiro[fluoren-benzofluorenyl]yl, spiro[cyclopentene-fluorenyl]yl, spiro[dihydroindene-fluorenyl]yl, azlenyl, tetramethyldihydrophenantrenyl, and the like. Specifically, the aryl compounds mentioned above include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthacenyl, pyrenyl, 1-crisenyl, 2-crisenyl, 3-crisenyl, 4-crisenyl, 5-crisenyl, 6-crisenyl, benzo[c]phenanthryl, benzo[g]crisenyl, 1-triphenylenyl, 2-triphenylenyl, 3-triphenylenyl, 4-triphenylenyl, 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl Luorenyl, 9-Fluorenyl, Benzo[a]Fluorenyl, Benzo[b]Fluorenyl, Benzo[c]Fluorenyl, Dibenzofluorenyl, 2-Biphenylyl, 3-Biphenylyl, 4-Biphenylyl, o-Terphenyl, m-Terphenyl-4-yl, m-Terphenyl-3-yl, m-Terphenyl-2-yl, p-Terphenyl-4-yl, p-Terphenyl-3-yl, p-Terphenyl-2-yl, m-Quaterphenyl, 3-Fluoranthenyl, 4-Fluoranthenyl, 8-Fluoranthenyl, 9-Fluoranthenyl, Benzofluoranthenyl, o-Tolyl, m-Tolyl, p-Tolyl, 2,3-Xylyl, 3,4-Xylyl, 2,5-Xylyl, Mesityl, o-Cumenyl, m-Cumenyl, p-Cumenyl, p-Tert-Butylphenyl, p-(2-Phenylpropyl)phenyl, 4'-Methylbiphenyl, 4″-Tert-Butyl-p-Terphenyl-4-yl, 9,9-Dimethyl-1-Fluorenyl, 9,9-Dimethyl-2-Fluorenyl, 9,9-Dimethyl-3-Fluorenyl, 9,9-Dimethyl-4-Fluorenyl, 9,9-Diphenyl-1-Fluorenyl, 9,9-Diphenyl-2-Fluorenyl, 9,9-Diphenyl-3-Fluorenyl, 9,9-Diphenyl Phenyl-4-fluorenyl, 11,11-dimethyl-1-benzo[a]fluorenyl, 11,11-dimethyl-2-benzo[a]fluorenyl, 11,11-dimethyl-3-benzo[a]fluorenyl, 11,11-dimethyl-4-benzo[a]fluorenyl, 11,11-dimethyl-5-benzo[a]fluorenyl, 11,11-dimethyl-6-benzo[a]fluorenyl, 11,11-dimethyl-7-benzo[a]fluorenyl, 11,11-dimethyl-8-benzo[a]fluorenyl, 11,11-dimethyl-9-benzo[a]fluorenyl, 1 1,11-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 Zo[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 11,11-diphenyl-9-benzo[a]fluorenyl, 11,11-diphenyl-10-benzo[a]fluorenyl, 11,11-diphenyl-1-benzo[b]fluorenyl, 11,11-diphenyl-2-benzo[b]fluorenyl, 11,11-diphenyl-3-benzo[b]fluorenyl, 11,11-diphenyl-4-benzo[b]fluorenyl, 11,11-diphenyl-5-benzo[b]fluorenyl, 11,11-diphenyl-6-benzo[b]fluorenyl, 11,11-diphenyl-7-benzo[b]fluorenyl Fluorenzo[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, 9,9,10,10-tetramethyl-9,Examples include 10-dihydro-4-phenantrenyl.

[0020] In this specification, "(3-30 membered) heteroaryl" and "(3-30 membered) heteroarene" mean an aryl or arylene group having 3 to 30 ring skeleton atoms and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si, P, Se, Te, and Ge. The number of heteroatoms is preferably 1 to 4. The heteroaryl or heteroarylene may be a monocyclic ring or a fused ring fused with at least one benzene ring, and may be partially saturated. In addition, the heteroaryl or heteroarylene may be formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond, and may include a spiro structure. The above heteroaryls include monocyclic heteroaryls such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetradinyl, triazolyl, tetrazolyl, flazanil, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, etc., as well as benzofuranil, benzothiophenyl, isobenzofuranil, dibenzofuranil, dibenzothiophenyl, dibenzoselenophenyl, naphthobenzofuranil, naphthobenzothiophenyl, naphthoxazolyl, benzofloquinolinil, benzofloquinazolinil, benzoflonaphthyridinil, benzoflopyrimidinil, naphthofyrimidinil, benzothienocinolyl, Nzothienokinazolinyl, naphthylidinyl, benzothienonaphthylidinyl, benzothienopyrimidinyl, naphthienopyrimidinyl, pyrimidoindol, benzopyrimidoindol, benzoflopyrazinyl, naphthoflopyridinyl, benzothienopyridinyl, naphthienopyridinyl, phenanthroxazolyl, phenanthrothiazolyl, phenanthrobenofuranil, benzophenanthrothiophenyl, pyrazinoindolyl, benzopyradhiazolyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, benzoquinazolinyl, quinoxalinylExamples of condensed ring heteroaryls include benzoquinoxalinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenantridinyl, benzodioxolyl, dihydroacridinyl, benzotriazolyl, phenadinyl, imidazopyridyl, clomenoquinazolinyl, thioclomenoquinazolinyl, dimethylbenzopyrimidinyl, indolocarbazolyl, indenocarbazolyl, and others. More specifically, the heteroaryls mentioned above include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2,3-triazin-4-yl, 1,2,4-triazin-3-yl, 1,3,5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolidinyl, 2-indolidinyl, 3-indolidinyl, 5 -Indolidinyl, 6-Indolidinyl, 7-Indolidinyl, 8-Indolidinyl, 2-Imidazopyridyl, 3-Imidazopyridyl, 5-Imidazopyridyl, 6-Imidazopyridyl, 7-Imidazopyridyl, 8-Imidazopyridyl, 3-Pyridyl, 4-Pyridyl, 1-Indolyl, 2-Indolyl, 3-Indolyl, 4-Indolyl, 5-Indolyl, 6-Indolyl, 7-Indolyl, 1-Isoindolyl, 2-Isoindolyl, 3-Isoin Drill, 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-phenanthridine, 2-phenanthridine, 3-phenanthridine, 4-phenanthridine, 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-oxadiazolyl, 5-oxadiazolyl, 3-flazanyl, 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-tert-butylpyrrole-4-yl, 3-(2-phenylpropyl)pyrrole-1-yl, 2-methyl Chil-1-indolyl, 4-methyl-1-indolyl, 2-methyl-3-indolyl, 4-methyl-3-indolyl, 2-tert-butyl-1-indolyl, 4-tert-butyl-1-indolyl, 2-tert-butyl-3-indolyl, 4-tert-butyl-3-indolyl, 1-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzofuranyl, 1-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho-[1,2-b]-benzofuranyl 2-Naphtho-[1,2-b]-benzofuranyl, 3-Naphtho-[1,2-b]-benzofuranyl, 4-Naphtho-[1,2-b]-benzofuranyl, 5-Naphtho-[1,2-b]-benzofuranyl, 6-Naphtho-[1,2-b]-benzofuranyl, 7-Naphtho-[1,2-b]-benzofuranyl, 8-Naphtho-[1,2-b]-benzofuranyl, 9-Naphtho-[1,2-b]-benzofuranyl, 10-Naphtho-[1,2-b]-benzofuranyl, 1-Naphtho-[2,3-b]-benzofuranyl, 2-Naphtho-[2,3-b]-benzofuranyl,3-Naphtho-[2,3-b]-benzofuranil, 4-Naphtho-[2,3-b]-benzofuranil, 5-Naphtho-[2,3-b]-benzofuranil, 6-Naphtho-[2,3-b]-benzofuranil, 7-Naphtho-[2,3-b]-benzofuranil, 8-Naphtho-[2,3-b]-benzofuranil, 9-Naphtho-[2,3-b]-benzofuranil, 10-Naphtho-[2,3-b]-benzofuranil, 1-Naphtho-[2,1-b]-benzofuranil, 2-Naphtho-[2,1-b]-benzofuranil, 3-Naphtho-[2,1-b]-benzofuranil, 4-Naphtho-[ 2,1-b]-benzofuranyl, 5-naphtho-[2,1-b]-benzofuranyl, 6-naphtho-[2,1-b]-benzofuranyl, 7-naphtho-[2,1-b]-benzofuranyl, 8-naphtho-[2,1-b]-benzofuranyl, 9-naphtho-[2,1-b]-benzofuranyl, 10-naphtho-[2,1-b]-benzofuranyl, 1-naphtho-[1,2-b]-benzothiophenyl, 2-naphtho-[1,2-b]-benzothiophenyl, 3-naphtho-[1,2-b]-benzothiophenyl, 4-naphtho-[1,2-b]-benzothiophenyl, 5-naphtho- [1,2-b]-benzothiophenyl, 6-naphtho-[1,2-b]-benzothiophenyl, 7-naphtho-[1,2-b]-benzothiophenyl, 8-naphtho-[1,2-b]-benzothiophenyl, 9-naphtho-[1,2-b]-benzothiophenyl, 10-naphtho-[1,2-b]-benzothiophenyl, 1-naphtho-[2,3-b]-benzothiophenyl, 2-naphtho-[2,3-b]-benzothiophenyl, 3-naphtho-[2,3-b]-benzothiophenyl, 4-naphtho-[2,3-b]-benzothiophenyl, 5-naphtho-[2,3-b]-be Nzothiophenyl, 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]pyrazinnyl, 6-Benzoflo[3,2-d]pyrazinnyl, 7-Benzoflo[3,2-d]pyrazinnyl, 8-Benzoflo[3,2-d Examples include pyrazinyl, 9-benzoflo[3,2-d]pyrazinyl, 2-benzothio[3,2-d]pyrazinyl, 6-benzothio[3,2-d]pyrazinyl, 7-benzothio[3,2-d]pyrazinyl, 8-benzothio[3,2-d]pyrazinyl, 9-benzothio[3,2-d]pyrazinyl, 1-silafluorenyl, 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germafluorenyl, 2-germafluorenyl, 3-germafluorenyl, 4-germafluorenyl, 1-dibenzoselenophenyl, 2-dibenzoselenophenyl, 3-dibenzoselenophenyl, 4-dibenzoselenophenyl, etc. "(3-30 member) heteroaryl(len)" can be classified into heteroaryl(len) with electronic properties and heteroaryl(len) with hole properties. Heteroaryl(enes) with electronic properties are substituents that are relatively electron-rich in the parent nucleus, such as substituted or unsubstituted pyridinyl, substituted or unsubstituted pyrimidinyl, substituted or unsubstituted triazinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, or substituted or unsubstituted quinolyl. Heteroaryl(enes) with hole properties are substituents that are relatively electron-deficient in the parent nucleus, such as substituted or unsubstituted carbazolyl, substituted or unsubstituted dibenzofuranyl, or substituted or unsubstituted dibenzothiophenyl. In this disclosure, "halogen" includes F, Cl, Br, and I.

[0021] In addition, "ortho-" ("o-"), "meta-" ("m-"), and "para-" ("p-") are prefixes that indicate the relative positions of substituents. The prefix "ortho-" indicates that two substituents are adjacent to each other. For example, in a benzene derivative, if two substituents occupy positions 1 and 2 or 2 and 3, this is called an "ortho-" configuration. The prefix "meta-" indicates that two substituents are at positions 1 and 3. For example, in a benzene derivative, if two substituents occupy positions 1 and 3, this is called a "meta-" configuration. The prefix "para-" indicates that two substituents are at positions 1 and 4. For example, in a benzene derivative, if two substituents occupy positions 1 and 4, this is called a "para-" configuration.

[0022] In this specification, "substituted" in the expression "substituted or unsubstituted" means that a hydrogen atom in a particular functional group is replaced by another atom or another functional group, i.e., a substituent. Unless otherwise specified, substituents may replace hydrogen wherever a substituent can be substituted without limitation, and if two or more hydrogen atoms in a particular functional group are each replaced by substituents, each substituent may be the same or different from one another. The maximum number of substituents that can be substituted for a given functional group may be the total number of valencies that can be substituted for each atom forming the functional group. In this specification, substituted alkyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted cycloalkyl, substituted condensed ring groups of aliphatic and aromatic rings, substituted arenes, and substituted heteroarenes are each independently deuterium, halogen, cyano, carboxyl, nitro, hydroxyl, phosphine oxide group, (C1-C 30 ) Alkyl, Halo (C1~C 30 ) Alkyl, (C2~C 30 ) Alkenil, (C2~C 30 ) Alkinyl, (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, (3 - 30 member) heteroaryl, (C6 - C 30 )Aryl, tri(C1 - C 30 )Alkylsilyl, tri(C6 - C 30 )Arylsilyl, di(C1 - C 30 )Alkyl(C6 - C 30 )Arylsilyl, (C1 - C 30 )Alkyldi(C6 - C 30 )Arylsilyl, amino, mono - or di(C1 - C 30 )Alkylamino, mono - or di(C2 - C 30 )Alkenylamino, 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 )Alkenyl(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 )Alkoxycarbonyl, (C6 - C 30 )Arylcarbonyl, di(C6 - C 30 )Arylboronyl, (C6 - C 30 )Arylphosphinyl, di(C1 - C 30 )Alkylboronyl, (C1 - C 30 )Alkyl(C6 - C 30 )Arylboronyl, (C6 - C<e 30 )ar(C1 - C 30 )Alkyl, (C1 - C 30 )Alkyl(C6 - C 30) may be substituted with at least one selected from the group consisting of aryls and combinations thereof, each of which may be further substituted with deuterium. According to one embodiment of the present disclosure, each substituted alkyl, etc. may be independently substituted with deuterium, (C1~C 30 )alkyl, substituted or unsubstituted (3-30 member) heteroaryl, and substituted or unsubstituted (C6-C 30 ) may be substituted with at least one selected from the group consisting of aryls. According to another embodiment of the present disclosure, the substituted alkyl, etc., can each be independently deuterium, substituted or unsubstituted (3-20 member) heteroaryls, and substituted or unsubstituted (C6-C) heteroaryls. 20 ) may be substituted with at least one selected from the group consisting of aryls. For example, each substituted alkyl may be independently substituted with at least one selected from the group consisting of deuterium, phenyl, naphthyl, phenantrenyl, biphenyl, dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl, and benzocarbazolyl, each of which may be further substituted with deuterium.

[0023] In this specification, if a substituent is not shown in a formula or compound structure, it may mean that all possible positions for the substituent are hydrogen or deuterium. That is, in the case of deuterium, it is an isotope of hydrogen, and some hydrogen atoms may be isotopic hydrogen, in which case the deuterium content may be 0% to 100%. In this disclosure, if a substituent is not shown in a formula or compound structure, hydrogen and deuterium may be used together in a compound unless substituents are explicitly excluded, such as 0% deuterium, 100% hydrogen, and all substituents being hydrogen. Deuterium is one of the isotopes of hydrogen and is an element having a deuteron, which consists of one proton and one neutron as its nucleus. It can be represented as hydrogen-2, and its element symbol is also D or 2 It can also be written as H. Isotopes are atoms that have the same atomic number (Z) but different mass numbers (A), and can also be interpreted as elements that have the same number of protons but different numbers of neutrons.

[0024] In this specification, “these combinations” means combinations of one or more elements from the corresponding list to form known or chemically stable configurations that can be conceived by those skilled in the art from the corresponding list. For example, alkyl and deuterium can be combined to form partially or completely deuterated alkyl groups; halogens and alkyl groups can be combined to form alkyl halide substituents; halogens, alkyl groups, and aryl groups can be combined to form arylalkyl halides. For example, preferred combinations of substituents may include up to 50 atoms excluding hydrogen or deuterium, up to 40 atoms excluding hydrogen or deuterium, up to 30 atoms excluding hydrogen or deuterium, or in many cases, preferred combinations of substituents may include up to 20 atoms excluding hydrogen or deuterium.

[0025] In the formulas of this disclosure, when a ring is formed by bonding with adjacent substituents, the ring may bond with two or more adjacent substituents to form a substituted or unsubstituted, monocyclic or polycyclic, (3-30 member) alicyclic or aromatic ring, or a combination thereof. In addition, the formed ring may contain at least one heteroatom selected from B, N, O, S, Si, and P, preferably at least one heteroatom selected from N, O, and S. According to one embodiment of this disclosure, the number of ring skeleton atoms is 5 to 20, and according to another embodiment of this disclosure, the number of ring skeleton atoms is 5 to 15.

[0026] This disclosure provides a plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following formula 1, the second host compound is represented by the following formula 2, and the first host compound and the second compound are different from each other.

[0027] The compound represented by Formula 1 is described in more detail below.

[0028] In Equation 1, Ar1 is either substituted or unsubstituted (C6~C 30) represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl. According to one embodiment of the present disclosure, Ar1 is a substituted or unsubstituted (C6-C 20 )aryl, or substituted or unsubstituted (3-15 member) heteroaryl. According to another embodiment of the present disclosure, Ar1 may be unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, or a combination thereof. According to yet another embodiment of the present disclosure, Ar1 may be substituted or unsubstituted (C6-C 14 ) may be aryl. For example, Ar1 may be phenyl, naphthyl, phenantrenyl, or biphenyl, and these may be further substituted with deuterium.

[0029] L1 is a single bond, or substituted or unsubstituted (C6~C 30 ) represents arylene. According to one embodiment of the present disclosure, L1 is a single bond or substituted or unsubstituted (C6~C 20 ) may be arylene. According to another embodiment of the present disclosure, L1 may be a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, or an unsubstituted or deuterium-substituted naphthylene. According to yet another embodiment of the present disclosure, L1 may be (C6~C 12 ) It may be an arylene. For example, L1 may be a single bond or phenylene, which may be further substituted with deuterium.

[0030] R1 to R8 each independently represent either hydrogen or deuterium.

[0031] L2 is either substituted or non-substituted (C6~C 30 ) represents arylene. According to one embodiment of the present disclosure, L2 is substituted or non-substituted (C6~C 20) may be arylene. According to another embodiment of the present disclosure, L2 may be a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, or an unsubstituted or deuterium-substituted naphthylene. According to yet another embodiment of the present disclosure, L2 may be (C6~C 12 ) may be arylene. For example, L2 may be phenylene, naphthylene, or biphenylene, which may be further substituted with deuterium.

[0032] Ar2 is represented by the following equation 1-1. [ka]

[0033] In equation 1-1, R'1~R' 10 These are, independently, hydrogen, deuterium, or unsubstituted or deuterium-substituted (C6~C 30 ) Represents the aryl group, R'1~R' 10 One of them is coupled to L2. According to one embodiment of the present disclosure, R'1~R' 10 These are, independently, hydrogen, deuterium, or unsubstituted or deuterium-substituted (C6~C 20 ) is an aryl, R'1~R' 10 One of them may be coupled to L2. According to another embodiment of the present disclosure, R'1~R' 10 Each of these may independently be hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, or a combination thereof. According to further embodiments of the present disclosure, R'1~R' 10 These are, independently of each other, (C6~C 12 ) It can be an aryl. For example, R'1~R' 10 Each of these can independently be hydrogen, deuterium, or phenyl, and they can be further substituted with deuterium.

[0034] 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] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0035] In the above compound, D n This means that n hydrogen atoms are substituted with deuterium, where n is an integer from 1 to the maximum number of hydrogen atoms in the compound.

[0036] The compound represented by formula 2 is described in more detail below.

[0037] In equation 2, Ar 11 is either a substitution or a non-substitution (C6~C 30 ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl. According to one embodiment of the present disclosure, Ar 11is either a substitution or a non-substitution (C6~C 29 ) may be an aryl or a substituted or unsubstituted (3-25 member) heteroaryl. According to another embodiment of the present disclosure, Ar 11 This includes unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, unsubstituted or deuterium-substituted dimethylfluorenyl, unsubstituted or deuterium-substituted diphenylfluorenyl, unsubstituted or deuterium-substituted dimethylbenzofluorenyl, and unsubstituted or deuterium-substituted diphenylbenzofluorenyl. It may be renyl, unsubstituted or deuterium-substituted spirobifluorenyl, unsubstituted or deuterium-substituted triphenylenyl, unsubstituted or deuterium-substituted carbazolyl, unsubstituted or deuterium-substituted benzocarbazolyl, unsubstituted or deuterium-substituted dibenzofuranyl, unsubstituted or deuterium-substituted benzonaphthofuranil, unsubstituted or deuterium-substituted dibenzothiophenyl, unsubstituted or deuterium-substituted benzonaphthothiophenyl, or a combination thereof. According to further embodiments of the present disclosure, Ar 11 is either a substitution or a non-substitution (C6~C 29 ) It may be an aryl, or a substituted or unsubstituted (13-17 member) heteroaryl. For example, Ar 11These may be unsubstituted or phenyl substituted with naphthyl, dimethylfluorenyl, phenantrenyl, carbazolyl, benzocarbazolyl, dibenzofuranil, or dibenzothiophenyl; unsubstituted or naphthyl-substituted biphenyl; unsubstituted or naphthyl-substituted naphthyl; terphenyl; phenantrenyl; dimethylfluorenyl; diphenylfluorenyl; dimethylbenzofluorenyl; diphenylbenzofluorenyl; spirobifluorenyl; triphenylenyl; unsubstituted or phenyl-substituted carbazolyl; benzocarbazolyl; dibenzofuranil; benzonaphthofuranil; dibenzothiophenyl; or benzonaphthothiophenyl, etc., which may be further substituted with deuterium.

[0038] L 11 This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene. According to one embodiment of the present disclosure, L 11 This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 20 ) may be arylene, or substituted or unsubstituted (3-20 member) heteroarylene. According to another embodiment of the present disclosure, L 11 L may be a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, an unsubstituted or deuterium-substituted naphthylene, or an unsubstituted or deuterium-substituted carbazoylene. According to another embodiment of the present disclosure, L 11 This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 12 ) may be arylene, or substituted or unsubstituted (6-20 member) heteroarylene. For example, L 11 These can be single bonds, phenylene, biphenylene, naphthylene, or carbazoylene, and these can be further substituted with deuterium.

[0039] R 11 ~R 18 Each of these independently represents either hydrogen or deuterium.

[0040] L 12 This is a single bond or a substituted or unsubstituted bond (C6~C 30 ) represents allerene. According to one embodiment of the present disclosure, L 12 (C6~C 12 ) may be arylene. According to another embodiment of the present disclosure, L 12 L may be a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, an unsubstituted or deuterium-substituted naphthylene, or an unsubstituted or deuterium-substituted carbazoylene. According to further embodiments of the present disclosure, L 12 This can be unsubstituted or deuterium-substituted phenylene. For example, L 12 These can be single bonds, phenylene, biphenylene, or naphthylene, and these can be further substituted with deuterium.

[0041] Ar 12 This is expressed by the following equation 2-1. [ka]

[0042] In equation 2-1, X is either O or S.

[0043] In Equation 2-1, R' 11 ~R' 18 These are, independently, hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C) 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 ) Represents an aryl or a combination thereof; or may bond with adjacent substituents to form a ring. According to one embodiment of the present disclosure, R' 11 ~R' 18 These are, independently, hydrogen, deuterium, substituted or unsubstituted (C6~C 30) may be an aryl or a combination thereof, or may bond with adjacent substituents to form a ring. According to another embodiment of the present disclosure, R' 11 ~R' 18 Each of these can independently be hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, or a combination thereof; or it can bond with an adjacent substituent to form an unsubstituted or deuterium-substituted benzene ring. For example, R' 11 ~R' 18 Each of these atoms may independently be hydrogen, deuterium, phenyl, biphenyl, or naphthyl; or they may bond with adjacent substituents to form a benzene ring, which may be further substituted with deuterium.

[0044] R' 11 ~R' 18 One of them is L 12 It is connected.

[0045] 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]

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[0046] In the above compound, D n This means that n hydrogen atoms are replaced by deuterium, where n is an integer from 1 up to the maximum number of hydrogen atoms in the compound.

[0047] According to one embodiment of the present disclosure, in a plurality of host materials of the present disclosure, at least one of formulas 1 and 2 contains deuterium. Preferably, in a plurality of host materials of the present disclosure, formula 1 may be substituted with deuterium. In addition, in a plurality of host materials of the present disclosure, the deuterium substitution rate of formula 1 or 2 may be preferably 20% or more and 100% or less, more preferably 20% or more and less than 90%, and even more preferably 50% or more and less than 90%. In addition, preferably, a plurality of host materials of the present disclosure may contain hydrogen in the formula that is not substituted with deuterium.

[0048] This disclosure provides an organic electroluminescent compound represented by formula 1-a.

[0049] The organic electroluminescent compound represented by formula 1-a is described in more detail below. [ka]

[0050] In equation 1-a, R 50 ~R 61 At least one of them represents either formula 1-b or formula 1-c below, and the remainder are independently hydrogen or deuterium. For example, R 57 This can be equation 1-b or equation 1-c, and R 50 ~R 56 and R 58 ~R 61 This can be hydrogen or deuterium; or R 50 This can be equation 1-b or equation 1-c, and R 51 ~R 61 This can be hydrogen or deuterium. [ka]

[0051] In 1-b and 1-c, R 62 ~R 65 and R 68 Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R 62 ~R 65 and R 68 At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl.

[0052] In equations 1-b and 1-c, R 66 and R 67 Each of these independently represents either hydrogen or deuterium.

[0053] In equations 1-b and 1-c, R 69 ~R 75 Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R 69 ~R 75 At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl.

[0054] The compound represented by formula 1-a may be selected from, but is not limited to, the following compounds. [ka] [ka] [ka] [ka] [ka]

[0055] In the above compound, D n This means that n hydrogen atoms are substituted with deuterium, where n is an integer from 1 to the maximum number of hydrogen atoms in the compound.

[0056] This disclosure provides an organic electroluminescent compound represented by formula 2-a.

[0057] The organic electroluminescent compound represented by formula 2-a is described in more detail below. [ka]

[0058] In equation 2-a, Ar 11 is either a substitution or a non-substitution (C6~C 30 ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl. According to one embodiment of the present disclosure, Ar 11 is either a substitution or a non-substitution (C6~C 25 ) may be an aryl, or a substituted or unsubstituted (5-25 member) heteroaryl. According to another embodiment of the present disclosure, Ar 11 is either a substitution or a non-substitution (C6~C 18 ) may be an aryl or a substituted or unsubstituted (5-18 member) heteroaryl. For example, Ar 11 These may be phenyl, biphenyl, or naphthyl, and they may be further substituted with deuterium.

[0059] L 11 This refers to single bonds, substitutions, or unsubstituted bonds (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene. According to one embodiment of the present disclosure, L 11 This is a single bond or a substituted or unsubstituted bond (C6~C 25) may be allirene. According to another embodiment of the present disclosure, L 11 This is a single bond or a substituted or unsubstituted bond (C6~C 18 ) It could be allirene. For example, L 11 These can be single bonds or phenylene, etc., and these can be further substituted with deuterium.

[0060] R 11 ~R 18 Each of these independently represents either hydrogen or deuterium.

[0061] L 12 This is a single bond or a substituted or unsubstituted bond (C6~C 30 ) represents allerene. According to one embodiment of the present disclosure, L 12 It can be a single bond.

[0062] Ar 12 This is expressed by the following equation 2-b. [ka]

[0063] In equation 2-b, X is either O or S.

[0064] In equation 2-b, R' 11 ~R' 18 These are, independently, hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C) 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 ) Represents an aryl or a combination thereof; or may bond with adjacent substituents to form a ring. According to one embodiment of the present disclosure, R' 11 ~R' 18 These are, independently, hydrogen, deuterium, or substituted or unsubstituted (C6~C) 30 ) It may be an aryl group; or it may bond with an adjacent substituent to form a ring. For example, R' 11 ~R' 18These can each be independently hydrogen, deuterium, phenyl, biphenyl, or naphthyl, and they can be further substituted with deuterium.

[0065] R' 11 ~R' 13 One of them is L 12 It is connected to L 12 R' is not coupled 11 ~R' 13 The remainder and R' 14 ~R' 18 At least one of them is either substituted or non-substituted (C1~C 30 ) alkyl, substituted or unsubstituted (C3~C 30 )Cycloalkyl, substituted or unsubstituted (C6~C 30 ) Aryl, substituted or unsubstituted (C6~C 30 ) Heteroaryls, or combinations thereof. According to one embodiment of the present disclosure, L 12 R' is not coupled 11 ~R' 13 The remainder and R' 14 ~R' 18 At least one of them is either substituted or non-substituted (C6~C 30 )aryl, preferably unsubstituted or deuterium-substituted (C6~C 25 )aryl, more preferably unsubstituted or deuterium-substituted (C6~C 18 ) It could be an aryl. For example, R' 13 L 12 It is coupled with R' 11 , R' 12 , and R' 14 ~R' 18 At least one of these may be an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl.

[0066] According to one embodiment of the present disclosure, the compound represented by formula 2-a may be selected from, but is not limited to, the following compounds. [ka] [ka] [ka]

[0067] Of the above compounds, D n In this equation, n represents the number of substituted deuterium atoms, and n ranges from 0 to the maximum number of deuterium atoms in the compound, where n being 0 represents a hydrogen compound.

[0068] According to one embodiment of the present disclosure, the organic electroluminescent compound represented by formula 2-a of the present disclosure may contain deuterium. Preferably, the organic electroluminescent compound represented by formula 2-a may be partially substituted with deuterium or may be completely substituted with deuterium. For example, it is not necessary that all hydrogens in the organic electroluminescent compound represented by formula 2-a be substituted with deuterium. According to another embodiment of the present disclosure, in the organic electroluminescent compound represented by formula 2-a of the present disclosure, only anthracene may be completely substituted with deuterium, or -L 11 -Ar 11 Only can be substituted with deuterium. According to another embodiment of the present disclosure, in an organic electroluminescent compound represented by formula 2-a of the present disclosure, anthracene and -L 11 -Ar 11 Both can be completely substituted with deuterium.

[0069] In the organic electroluminescent compound represented by formula 2-a, the deuterium substitution rate is preferably 40% or more, more preferably 50% or more, and even more preferably 60% or more of the total number of hydrogen atoms. For example, the deuterium substitution rate in the formula does not need to be 100%.

[0070] The compounds represented by formulas 1, 1-a, 2, and 2-a according to this disclosure can be synthesized by reference to synthesis methods known to those skilled in the art. For example, the compound represented by formula 1 according to this disclosure can be synthesized by reference to (Patent Document 4), etc., but is not limited thereto. The compound represented by formula 2 according to this disclosure can be synthesized by reference to synthesis methods disclosed in (Patent Document 5), etc., but is not limited thereto. Among the compounds represented by formulas 1 and 2 according to this disclosure, the deuterium-substituted compounds can be produced by reference to the above documents and (Patent Document 6), but is not limited thereto.

[0071] When hydrogen atoms in a compound according to this disclosure are substituted with deuterium, hydrogen atoms at various positions within the compound can be substituted with deuterium. A deuterium-substituted compound may be a composition containing two or more isotopes having different molecular weights depending on the number of substituted deuterium atoms, and the isotope having the highest isotopic content for each mass number may be present in the composition. Preferably, the isotope having the highest isotopic content for each mass number appears in 50% or more of the number of hydrogen atoms in the compound, and the deuterium substitution distribution can vary within a numerical range. The deuterium substitution distribution can be obtained by mass chromatogram analysis.

[0072] The organic electroluminescent element according to this disclosure comprises an anode, a cathode, and at least one organic layer between the anode and the cathode. At least one layer of the light-emitting layer comprises a plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by formula 1 and the second host compound is represented by formula 2, and the first and second host compounds comprise different types of host materials. Here, the weight ratio of the first host compound to the second host compound in the light-emitting layer can be in the range of about 1:99 to about 99:1, preferably about 10:90 to about 90:10, more preferably about 30:70 to about 70:30, more preferably about 40:60 to about 60:40, and even more preferably about 50:50. For example, the multiple host materials of this disclosure may include at least one compound from the first host compounds H1-1 to H1-370 and at least one compound from the second host compounds H2-1 to H2-952, and these multiple host materials may be contained in the same organic layer, for example, an emissive layer, or each may be contained in different emissive layers.

[0073] The organic electroluminescent compound represented by formula 1-a or formula 2-a of this disclosure may be included in at least one layer of the luminescent layer, hole injection layer, hole transport layer, hole auxiliary layer, luminescent auxiliary layer, electron transport layer, electron buffer layer, electron injection layer, intermediate layer, hole blocking layer, and electron blocking layer; optionally, preferably, it may be included in at least one layer of the luminescent layer, hole transport layer, hole auxiliary layer, luminescent auxiliary layer, electron transport layer, electron buffer layer, hole blocking layer, and electron blocking layer. When included in the luminescent layer, the organic electroluminescent compound represented by formula 1-a or formula 2-a of this disclosure may be included as a host material.

[0074] According to one embodiment of the present disclosure, the organic electroluminescent element of the present disclosure includes an anode, a cathode, 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 comprises an organic electroluminescent compound represented by formula 1-a, and the second light-emitting layer comprises at least two different compounds comprising an anthracene skeleton, and the first light-emitting layer and the second light-emitting layer are in direct contact. According to another embodiment of the present disclosure, the organic electroluminescent element of the present disclosure includes an anode, a cathode, 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 second light-emitting layer comprises an organic electroluminescent compound represented by formula 2-a, and the first light-emitting layer and the second light-emitting layer are in direct contact. Preferably, the second light-emitting layer may further comprise an additional anthracene-based compound in addition to the organic electroluminescent compound of formula 2-a of the present disclosure.

[0075] In addition to the hole transport layer and the light-emitting layer, the organic layer may further include at least one layer selected from a hole injection 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. In addition to the light-emitting material of this disclosure, the organic layer may further include amine-based compounds and / or azine-based compounds. Specifically, the hole injection layer, hole transport layer, hole auxiliary layer, light-emitting layer, light-emitting auxiliary layer, or electron blocking layer may include amine-based compounds, such as arylamine-based compounds and styrylarylamine-based compounds, as hole injection material, hole transport material, hole auxiliary material, light-emitting material, light-emitting auxiliary material, or electron blocking material. In addition, the electron transport layer, electron injection layer, electron buffer layer, or hole blocking layer may include azine-based compounds as electron transport material, electron injection material, electron buffer material, or hole blocking material. In addition, the organic layer may further include 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 at least one complex compound containing that metal.

[0076] The anode and cathode may be formed from a transparent conductive material or a translucent or reflective conductive material, respectively. Depending on the type of material forming the first and second electrodes, the organic electroluminescent element may be top-emission, bottom-emission, or double-sided emission.

[0077] A hole injection layer, hole transport layer, electron blocking layer, or a combination thereof may be used between the anode and the light-emitting layer. The hole injection layer may be multilayered to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or electron blocking layer, where each layer may use two compounds simultaneously. In addition, the hole injection layer may be doped with a p-type dopant. The electron blocking layer is placed between the hole transport layer (or hole injection layer) and the light-emitting layer to prevent electron overflow from the light-emitting layer and to prevent light leakage by confining excitons within the light-emitting layer. The hole transport layer or electron blocking layer may be multilayered, where multiple compounds may be used in each layer.

[0078] Electron buffer layers, hole blocking layers, electron transport layers, electron injection layers, or combinations thereof may be used between the light-emitting layer and the cathode. The electron buffer layer may be multilayered to control electron injection and improve the interfacial properties between the light-emitting layer and the electron injection layer, where each layer may use two compounds simultaneously. The hole blocking layer is placed between the electron transport layer (or electron injection layer) and the light-emitting layer and prevents holes from reaching the cathode, thereby improving the probability of electron-hole recombination in the light-emitting layer. The hole blocking layer or electron transport layer may also be multilayered, where multiple compounds may be used in each layer. In addition, the electron injection layer may be doped with an n-type dopant.

[0079] A light-emitting auxiliary layer, a hole-auxiliary layer, or an electron-blocking layer may have the effect of improving the efficiency and / or lifespan of an organic electroluminescent device.

[0080] The luminescence auxiliary layer may be a layer placed between the anode and the luminescence layer, or between the cathode and the luminescence layer. When the luminescence auxiliary layer is placed between the anode and the luminescence layer, it may be used to facilitate hole injection and / or transport, or to prevent electron overflow. When the luminescence auxiliary layer is placed between the cathode and the luminescence layer, it may be used to facilitate electron injection and / or transport, or to prevent hole overflow.

[0081] In addition, a hole auxiliary layer may be placed between the hole transport layer (or hole injection layer) and the light-emitting layer, and may exhibit the effect of promoting or blocking the hole transport rate (or hole injection rate), thereby enabling control of the charge balance. If the organic electroluminescent element includes two or more hole transport layers, the additionally included hole transport layers may be used as hole auxiliary layers or electron blocking layers.

[0082] In the organic electroluminescent element of this disclosure, it is preferable to place 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") on the inner surface of at least one of the electrode pairs. Specifically, silicon and aluminum chalcogenide (including oxide) layers are preferably placed on the anode surface on the electroluminescent medium layer side, and the metal halide layer or metal oxide layer is preferably placed on the cathode surface on the electroluminescent medium layer side. Such surface layers provide operational stability to the organic electroluminescent element. For example, chalcogenides include SiO X (1≦X≦2), AlO X (1≦X≦1.5), includes SiON, SiAlON, etc.; metal halides include LiF, MgF2, CaF2, rare earth metal fluorides, etc.; metal oxides include Cs2O, Li2O, MgO, SrO, BaO, CaO, etc.

[0083] In addition, in the organic electroluminescent device 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 placed on at least one surface of an electrode pair. In this way, the electron transport compound is reduced to anions, thus facilitating the injection and transport of electrons from the mixed region to the light-emitting medium. Furthermore, the hole transport compound is oxidized to cations, thus facilitating the injection and transport of holes from the mixed region to the light-emitting medium. Preferred oxidizing dopants include various Lewis acids and acceptor compounds, and preferred reducing dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. In addition, an organic electroluminescent device having at least two light-emitting layers and emitting white light can be manufactured by using a reducing dopant layer as a charge-generating layer.

[0084] The methods for manufacturing organic electroluminescent elements described herein are not limited, and the manufacturing methods of the device embodiments described below are merely examples and not limited thereto. Those skilled in the art can reasonably conceive of manufacturing methods of the device embodiments described below based on the prior art. For example, there are no specific restrictions on the mixing ratio of the first compound and the second compound, and therefore those skilled in the art can reasonably select it within a certain range based on the prior art. For example, based on the total weight of the light-emitting layer material, the total weight of the first compound and the second compound may account for 80.0% to 99.5% of the total weight of the light-emitting layer, the weight ratio of the first compound to the second compound may be 1:99 to 99:1, the weight ratio of the first compound to the second compound may be 20:80 to 99:1, or the weight ratio of the first compound to the second compound may be 50:50 to 90:10. In the manufacturing of a device, when a light-emitting layer is formed by co-depositing two or more host materials and a light-emitting material, the two or more host materials and the light-emitting material can be placed in different evaporation sources and co-deposited to form a light-emitting layer, or a pre-mixed mixture of two or more host materials can be placed in the same evaporation source and then co-deposited with a light-emitting material placed on another evaporation source to form a light-emitting layer. This pre-mixing method can further conserve the evaporation source. According to one embodiment, the first compound, the second compound, and the light-emitting material of the present disclosure can be placed in different evaporation sources and co-deposited to form a light-emitting layer, or a pre-mixed mixture of the first compound and the second compound can be placed in the same evaporation source and then co-deposited with a light-emitting material placed on another evaporation source to form a light-emitting layer. The light-emitting layer of the organic electroluminescent element according to one embodiment may be a single light-emitting layer or a plurality of layers of two or more layers stacked together. The luminescent layer may further contain one or more dopants, and the doping concentration of the dopant compound relative to the host compound in the luminescent layer may be less than 20% by weight, preferably less than 10% by weight.

[0085] An organic electroluminescent device according to an embodiment of the present disclosure can be an organic electroluminescent device having a tandem structure. In the case of a tandem organic electroluminescent device according to an embodiment, a single light-emitting unit (light-emitting unit) can be formed in a structure in which two or more units are connected by a charge generation layer. The organic electroluminescent device has a first electrode and a second electrode facing each other on a substrate, and a light-emitting layer laminated between the first electrode and the second electrode and emitting light in a specific wavelength range, and can include a plurality of two or more light-emitting units, for example, a plurality of three or more light-emitting units. The organic electroluminescent device can include a plurality of light-emitting units, and each of the light-emitting units can include a hole transport zone, a light-emitting layer, and a hole transport zone. The hole transport zone can include a hole injection layer and a hole transport layer, and the electron transport zone can include an electron transport layer and an electron injection layer. According to one embodiment, three or more light-emitting layers can be included in the light-emitting unit. The plurality of light-emitting units can emit the same color or different colors. Further, one light-emitting unit can include one or more light-emitting layers, and the plurality of light-emitting layers can be light-emitting layers of the same or different colors. This can include one or more charge generation layers located between each light-emitting unit. The charge generation layer refers to a layer in which holes and electrons are generated when a voltage is applied. When there are three or more light-emitting units, the charge generation layer can be placed between each light-emitting unit. Here, the plurality of charge generation layers can be the same as or different from each other. By arranging the charge generation layer between the light-emitting units, the current efficiency can be increased in each light-emitting unit, and the charge can be smoothly distributed. Specifically, the charge generation layer can be provided between two adjacent stacks and can be useful for driving a tandem organic electroluminescent device using only the pair of anode and cathode without a separate internal electrode located between the stacks.

[0086] The charge generation layer may be composed of an N-type charge generation layer and a P-type charge generation layer. The N-type charge generation layer may be doped with an alkali metal, an alkaline earth metal, or a compound of an alkali metal and an alkaline earth metal. The alkali metal may include one selected from the group consisting of Li, Na, K, Rb, Cs, Fr, Yb, and combinations thereof, and the alkaline earth metal may include one selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ra, and combinations thereof. The P-type charge generation layer may be made of a metal or an organic material doped with a P-type dopant. For example, the metal may be made of one or more alloys selected from the group consisting of Al, Cu, Fe, Pb, Zn, Au, Pt, W, In, Mo, Ni, and Ti. Further, the commonly used materials may be used as a host material for the P-type dopant and the P-type doped organic material.

[0087] The organic electroluminescent device according to one embodiment may further include at least one dopant in the light emitting layer.

[0088] The dopant included in the organic electroluminescent device of the present disclosure may be at least one phosphorescent or fluorescent dopant, preferably a fluorescent dopant. For example, the phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but is a complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), preferably an ortho-metalated complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably an ortho-metalated iridium complex compound.

[0089] The dopant included in the organic electroluminescent device of the present disclosure may use, but is not limited to, a compound represented by the following formula D.

Chemical formula

[0090] In formula D, Y'1 represents B or N; X'1 and X'2 each independently represent O, S, NR', or BR'; Rings a, b, and c each independently represent a substituted or unsubstituted aromatic hydrocarbon ring having 5 to 50 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 50 carbon atoms, a substituted or unsubstituted aliphatic ring having 3 to 30 carbon atoms, or a substituted or unsubstituted aliphatic aromatic mixed ring having 3 to 30 carbon atoms; Each R' can independently be 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 ) Represents an arylsilyl or -L'4-N-(Ar'4)(Ar'5); or may bond with adjacent substituents to form a ring; Each L'4 independently consists of a single bond, substitution, or non-substitution (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; Ar'4 and Ar'5 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 substituted or unsubstituted fused ring group with an aromatic ring, substituted or unsubstituted (C6~C 30 ) Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl.

[0091] According to one embodiment of the present disclosure, formula D may be represented by the following formula D-1. [ka]

[0092] In equation D-1, R 101 ~R 111 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 ) Represents an arylsilyl or -L'4-N-(AR'4)(AR'5); or may bond with adjacent substituents to form a ring; Each R' can independently be 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 ) Represents arylsilyl or -L'4-N-(AR'4)(AR'5); or R 101 , R 108 , R 109 , and R 111 It can combine with at least one of them to form a ring; Each L'4 independently consists of a single bond, substitution, or non-substitution (C6~C 30 ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; Ar'4 and Ar'5 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 substituted or unsubstituted fused ring group with an aromatic ring, substituted or unsubstituted (C6~C 30 ) Represents an aryl, or a substituted or unsubstituted (3-30 member) heteroaryl.

[0093] Preferably, R 101 ~R 111 These are, independently, hydrogen, deuterium, substituted or unsubstituted (C1~C 20 ) alkyl, substituted or unsubstituted (C6~C 25 ) Represents an aryl, or a substituted or unsubstituted (5-20 member) heteroaryl, or -L'4-N-(Ar'4)(Ar'5); or may bond with adjacent substituents to form a ring.

[0094] Comfortable, R 101 ~R 111 These are, independently, hydrogen; deuterium; and unsubstituted (C1~C) atoms. 10 )alkyl; unsubstituted or (C1~C 10 )alkyl, (13-18 member) heteroaryl, and di(C6-C) 18 ) Substituted with at least one arylamino (C6~C 18 )aryl; unsubstituted or at least one (C1~C 10) an alkyl-substituted (5-18 member) heteroaryl; or represents -L'4-N-(Ar'4)(Ar'5); or may bond with adjacent substituents to form a ring. For example, R 101 ~R 111 Each of these can independently be hydrogen, methyl, tert-butyl, substituted or unsubstituted phenyl, biphenyl, terphenyl, triphenylenyl, carbazolyl, phenoxazinyl, phenothiazinyl, dimethylacridinyl, dimethylxanthenyl, unsubstituted or diphenylamino substituted with at least one of methyl and diphenylamino, phenylnaphthylamino, dibiphenylamino, phenylcarbazolyl or dibenzofuranil substituted with phenylamino, or a (17-21 member) heteroaryl substituted with at least one of methyl and phenyl; or it can bond with an adjacent substituent to form a benzene ring, an indole ring substituted with at least one of phenyl and diphenylamino, a benzofuran ring, a benzothiophene ring, or a 19-membered heterocycle substituted with at least one methyl. The substituted phenyl can be substituted with at least one of methyl, carbazolyl, dibenzofuranyl, diphenylamino, phenoxazinyl, phenothiazinyl, and dimethylacridinyl.

[0095] According to one embodiment of the present disclosure, formula D may be represented by the following formulas D-2 or D-3. [ka]

[0096] In formulas D-2 and D-3, X'1 and X'2 each independently represent O, S, NR', or BR'; Rings a, b, and d each independently represent a substituted or unsubstituted aromatic hydrocarbon ring having 5 to 50 carbon atoms, a substituted or unsubstituted aromatic heterocycle having 2 to 50 carbon atoms, a substituted or unsubstituted aliphatic ring having 3 to 30 carbon atoms, or a substituted or unsubstituted aliphatic aromatic mixed ring having 3 to 30 carbon atoms; R’, L’4, Ar’4, and Ar’5 are as defined in formula D.

[0097] According to one embodiment of the present disclosure, specific examples of formula D are as follows, but are not limited thereto.

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Chemical formula

Chemical formula

[0098] In the above compounds, D2 to D5 each mean that 2 to 5 hydrogens are replaced by deuterium.

[0099] <000100The formation of each layer of the organic electroluminescent element of this disclosure can be achieved by applying either a dry deposition method such as vacuum deposition, sputtering, plasma deposition, or ion plating, or a wet deposition method such as spin coating, dip coating, or flow coating. 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 in which the material forming each layer can be dissolved or dispersed, provided that there are no problems whatsoever in terms of film formation.

[0100] According to one embodiment of the present disclosure, when forming layers of the first host compound and the second host compound of the present disclosure, the layers can be formed by the methods listed above, and in many cases can be formed by a co-evaporation or mixed evaporation process. Co-evaporation is a method in which two or more materials are mixed into separate crucible sources and an electric current is passed through both cells simultaneously to evaporate the materials. Mixed evaporation is a method in which two or more materials are mixed in one crucible source before evaporation and then an electric current is passed through one cell to evaporate the materials.

[0101] According to one embodiment of the present disclosure, when the first host compound and the second host compound are present in the same or different layers of an organic electroluminescent element, the two host compounds can be formed into films separately. For example, the second host material can be deposited after the first host material has been deposited.

[0102] Multiple host materials according to one embodiment of the present disclosure can be used as light-emitting materials for white organic light-emitting devices. White organic light-emitting devices have various proposed structures, such as side-by-side arrangements, stacking arrangements, or CCM (color conversion material) methods, 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 another embodiment of the present disclosure can also be applied to organic electroluminescent elements containing QDs (quantum dots). Furthermore, multiple host materials according to the present disclosure can be used for the manufacture of display devices such as smartphones, tablets, notebooks, PCs, and TVs, or display devices for vehicles, or lighting devices such as outdoor or indoor lighting.

[0103] This specification describes in detail, in relation to representative compounds of the Disclosure, the methods for preparing the compounds and their properties, as well as the luminescence properties of organic electroluminescent devices (OLEDs) comprising organic electroluminescent compounds or multiple host materials according to the Disclosure. However, the following examples are merely to illustrate the properties of organic electroluminescent compounds or OLEDs comprising multiple host materials according to the Disclosure for a more detailed understanding of the Disclosure, and the Disclosure is not limited to these examples. [Examples]

[0104] Example 1: Synthesis of compound H1-206-D17 [ka] 1) Synthesis of compound H1-1 Compound 1-1 (24.8 g, 86 mmol), Compound 1-2 (33.3 g, 112 mmol), Pd(OAc)2 (1.35 g, 6 mmol), SPhos (5.3 g, 13 mmol), K3PO4 (55 g, 258 mmol), toluene (500 mL), ethanol (125 mL), and distilled water (125 mL) were added to a flask, and the mixture was stirred under reflux at 120 °C for 3 hours. After the reaction was complete, the mixture was cooled to room temperature, and the organic layer was extracted with ethyl acetate (EA). Residual water was removed by drying with magnesium sulfate, and the organic layer was separated by column chromatography to obtain Compound H1-1 (20.2 g, yield: 46%).

[0105] [Table 1]

[0106] 2) Synthesis of compound H1-206-D17 Compound H1-1 was synthesized by selecting a deuteration method from those disclosed in (Patent Document 7) and (Patent Document 8), etc., to obtain compound H1-206-D17 (13g, yield: 99%, MS: [M+H]). + We obtained (=523.2).

[0107] Example 2: Synthesis of compound H3-1 [ka] 7-Bromotetrafen (15 g, 48.88 mmol), (4-phenylnaphthalen-1-yl)boronic acid (14.53 g, 58.59 mmol), Pd(OAc)2 (0.54 g, 2.44 mmol), XPhos (2.79 g, 5.85 mmol), K2CO3 (20.24 g, 146.48 mmol), toluene (400 mL), distilled water (100 mL), and ethanol (70 mL) were mixed and stirred under reflux at 120 °C. After 3 hours, the mixture was cooled to room temperature, distilled water was added, and the organic layer was extracted with EA. The organic layer was dried over magnesium sulfate and filtered under reduced pressure. The organic layer was distilled under reduced pressure and separated by column chromatography to obtain compound H3-1 (17.4 g, yield: 82.67%).

[0108] [Table 2]

[0109] Example 3: Synthesis of compound H3-93-D18 [ka] Compound H3-1 (38.5g) was synthesized by selecting a deuteration method from those disclosed in (Patent Document 7) and (Patent Document 8), etc., to obtain compound H3-93-D18 (27.0g, yield: 67.52%, MS: [M+H] + We obtained =448.1).

[0110] [Table 3]

[0111] Example 4: Synthesis of compound H3-4 [ka] 1) Synthesis of compound H3-4-P-1 1,5-Dibromonaphthalene (60 g, 209.8 mmol), phenylboronic acid (28.1 g, 230.8 mmol), Pd(PPh3)4 (12.1 g, 10.5 mmol), K2CO3 (72.5 g, 524.5 mmol), toluene (1 L), distilled water (250 mL), and ethanol (250 mL) were mixed and stirred under reflux at 120°C. After 3 hours, the mixture was cooled to room temperature, distilled water was added, and the organic layer was extracted with methylene chloride (MC). The organic layer was dried over magnesium sulfate and filtered under reduced pressure. The organic layer was distilled under reduced pressure and then separated by column chromatography using silica to obtain compound H3-4-P-1 (40.8 g, yield: 68.7%).

[0112] 2) Synthesis of compound H3-4 Compound H3-4-P-1 (40.8 g, 144.1 mmol), 4,4,5,5-tetramethyl-2-(tetraphen-7-yl)-1,3,2-dioxaborolane (56.1 g, 158.5 mmol), Pd(OAc)2 (1.6 g, 7.2 mmol), SPhos (7.1 g, 17.3 mmol), K3PO4 (76.5 g, 360.2 mmol), toluene (900 mL), distilled water (120 mL), and ethanol (120 mL) were mixed and stirred under reflux at 120°C. After 4 hours, the mixture was cooled to room temperature, distilled water was added, and the organic layer was extracted with toluene. The organic layer was dried over magnesium sulfate and filtered under reduced pressure. The organic layer was distilled under reduced pressure and then separated by silica column chromatography to obtain compound H3-4 (40.0 g, yield: 64.5%).

[0113] [Table 4]

[0114] Example 5: Synthesis of compound H3-94-D17 [ka] Compound H3-4 (40.0 g) was synthesized by selecting a deuteration method from those disclosed in (Patent Document 7) and (Patent Document 8), etc., to obtain compound H3-94-D17 (27.5 g, yield: 66.3%, MS: [M+H] + We obtained =447.2).

[0115] [Table 5]

[0116] In this specification, for a detailed understanding of the present disclosure, a method for preparing an organic electroluminescent element comprising multiple host materials and / or organic electroluminescent compounds according to the present disclosure, and its properties, are described below.

[0117] Device Example 1: Manufacturing of OLEDs by depositing compounds according to the present disclosure An OLED was manufactured according to this disclosure. A transparent electrode indium tin (ITO) thin film (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. Next, the ITO substrate was attached to the substrate holder of a vacuum deposition apparatus. Then, compound HI-1 was introduced into a cell of the vacuum deposition apparatus, and compound HT-1 was introduced into another cell of the vacuum deposition apparatus. The two materials were evaporated at different rates, and compound HI-1 was deposited at a doping amount of 5% by weight based on the total amount of compound HI-1 and compound 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 15 nm on the first hole transport layer. After the formation of the hole injection layer and hole transport layer, a first light-emitting layer was formed on top of them as follows: Compound Host 1 was introduced as a host into a vacuum deposition apparatus cell, and compound D-1 was introduced as a dopant into another cell. The two materials were evaporated at different rates, and the dopant was deposited with a doping amount of 2% by weight relative to the total amount of host and dopant, forming a first light-emitting layer with a thickness of 5 nm on the second hole transport layer. Next, a second light-emitting layer was formed on top of the first light-emitting layer as follows: The two compounds shown in Table 1 below were introduced as hosts into a vacuum deposition apparatus cell, and compound D-1 was introduced as a dopant into another cell. Next, the two host materials were deposited in a 1:1 weight ratio, and the dopant was deposited with a doping amount of 2% by weight, forming a second light-emitting layer with a thickness of 13 nm. After the deposition of the light-emitting layer, compound ET-1 was deposited as a hole blocking layer material to a thickness of 5 nm. Subsequently, compound ET-2 and compound EI-1 were introduced into two cells of a vacuum deposition apparatus as electron transport layer materials, and the two materials were deposited in a weight ratio of 2:1 to form an electron transport layer with a thickness of 25 nm.After depositing Yb (ytterbium) and LiF (lithium fluoride) in a 2:1 (Yb:LiF) weight ratio onto an electron transport layer to form an electron injection layer with a thickness of 1 nm, an Al cathode with a thickness of 80 nm was deposited onto the electron injection layer using a separate vacuum deposition apparatus. In this way, an OLED was manufactured. The amount of each compound used for all materials was 10. -6 It was purified by vacuum sublimation using a Thor's IV line.

[0118] Comparative Example 1: Manufacturing of an OLED containing a conventional compound as a host material An OLED was manufactured in the same manner as in Device Example 1, except that the compounds shown in Table 1 below were used as the host material for the second light-emitting layer.

[0119] The driving voltage, current efficiency, and time required for the brightness to decrease from 100% to 95% under 2× acceleration (lifetime; T) of the OLEDs manufactured in Device Example 1 and Comparative Example 1 at a brightness of 1,000 nits. 95 ) is provided in Table 1 below.

[0120] [Table 6]

[0121] From Table 1 above, it can be confirmed that an OLED containing a specific combination of compounds according to this disclosure as a host material (Device Example 1) exhibits a longer lifetime characteristic compared to an OLED containing a conventional compound (Comparative Example 1).

[0122] Device Examples 2 and 3: Manufacturing of OLEDs by depositing compounds according to the present disclosure An OLED was fabricated in the same manner as in Device Example 1, except that the compounds shown in Table 2 below were used instead of compound Host 1 in the first light-emitting layer.

[0123] The driving voltage at a brightness of 1,000 nits for the OLEDs manufactured in Device Examples 2 and 3, and the time required for the brightness to decrease from 100% to 90% under 2x acceleration (lifetime; T) 90 ) is provided in Table 2 below.

[0124] [Table 7]

[0125] From Table 2 above, it can be seen that OLEDs (Device Examples 2 and 3) containing specific combinations of compounds according to this disclosure as host materials maintain a low drive voltage and exhibit longer lifetime characteristics.

[0126] The compounds used in Examples 1-3 and Comparative Example 1 of the above-mentioned device are specifically shown in Table 3 below.

[0127] [Table 8]

[0128] [Table 9]

[0129] Device Examples 4-7: Manufacturing of OLEDs by depositing compounds according to the present disclosure An OLED was manufactured in the same manner as in Device Example 1, except that the compounds shown in Table 4 below were used as host materials for the first and second light-emitting layers.

[0130] Comparative Example 2: Manufacturing of an OLED containing a single light-emitting layer An OLED was manufactured in the same manner as in Device Example 4, except that only the second light-emitting layer was deposited to a thickness of 18 nm without the first light-emitting layer.

[0131] Current efficiency at 1,000 nits of brightness for the OLEDs manufactured in Device Examples 4-7 and Comparative Example 2, and the time required for the brightness to decrease from 100% to 95% under 2× acceleration (lifetime; T) 95 ) is provided in Table 4 below.

[0132] [Table 10]

[0133] From Table 4 above, it can be confirmed that OLEDs (Device Examples 4-7) containing specific combinations of compounds according to this disclosure as host materials maintain higher current efficiency and exhibit longer lifetime characteristics compared to OLEDs containing a single light-emitting layer (Comparative Example 2).

[0134] The compounds used in the above-mentioned Device Examples 4-7 and Comparative Example 2 are specifically shown in Table 5 below.

[0135] [Table 11]

[0136] [Table 12]

[0137] Device Example 8: Manufacturing of OLEDs by depositing compounds according to the present disclosure An OLED was manufactured according to this disclosure. A transparent electrode indium tin (ITO) thin film (Geomatec Co., Ltd., Japan) on a glass substrate for OLEDs was sequentially subjected to ultrasonic cleaning with acetone and isopropyl alcohol, and then stored in isopropyl alcohol. Next, the ITO substrate was attached to the substrate holder of a vacuum deposition apparatus. Then, compound HI-1 was introduced into a cell of the vacuum deposition apparatus, and compound HT-3 was introduced into another cell of the vacuum deposition apparatus. The two materials were evaporated at different rates, and compound HI-1 was deposited at a doping amount of 5% by weight based on the total amount of compound HI-1 and compound HT-3 to form a hole injection layer with a thickness of 10 nm. Next, compound HT-3 was deposited on the hole injection layer to form a first hole transport layer with a thickness of 80 nm. Next, compound HT-4 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 15 nm on the first hole transport layer. After forming the hole injection layer and hole transport layer, an emissive layer was formed on top of them as follows. The compounds shown in Table 6 below were introduced as hosts into a vacuum deposition apparatus cell, and compound D-2 was introduced as a dopant into another cell. The two materials were evaporated at different rates, and the dopant was deposited at a doping amount of 3 wt% based on the total amount of host and dopant to form an emissive layer with a thickness of 20 nm on the second hole transport layer. After the deposition of the emissive layer, compound ET-3 was deposited as a hole blocking layer material to a thickness of 5 nm. Subsequently, compound ET-4 and compound EI-1 were introduced into the two cells of the vacuum deposition apparatus as electron transport layer materials, and the two materials were deposited in a weight ratio of 2:1 to form an electron transport layer with a thickness of 25 nm. After depositing Yb (ytterivium) on the electron transport layer to form an electron injection layer with a thickness of 2 nm, an Al cathode with a thickness of 80 nm was deposited on the electron injection layer using another vacuum deposition apparatus. In this way, an OLED was manufactured. Each compound used for all the materials is 10 -6 It was purified by vacuum sublimation using a Thor's IV line.

[0138] Comparative Example 3: Manufacturing of OLEDs containing a comparative compound The OLED was manufactured in the same manner as in Device Example 8, except that the compounds shown in Table 6 below were used as the host material.

[0139] The driving voltage at a brightness of 1,000 nits for the OLEDs manufactured in Device Example 8 and Comparative Example 3, and the time required for the brightness to decrease from 100% to 95% under 2× acceleration (lifetime; T) 95 ) is provided in Table 6 below.

[0140] [Table 13]

[0141] From Table 6 above, it can be confirmed that the OLED containing the compound according to this disclosure as a host material (Device Example 8) maintains a lower drive voltage and exhibits a longer lifetime characteristic compared to the OLED containing the comparative compound (Comparative Example 3).

[0142] The compounds used in the above-mentioned Device Example 8 and Comparative Example 3 are specifically shown in Table 7 below.

[0143] [Table 14]

Claims

1. A plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following formula 1, the second host compound is represented by the following formula 2, and the first host compound and the second compound are different from each other: 【Chemistry 1】 During the ceremony, Ar １ is either substitution or non-substitution (C ６ ~C ３０ ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; L １ is a single bond or substitution or non-substitution (C ６ ~C ３０ ) Represents arrine; R １ ~R ８ Each of these independently represents either hydrogen or deuterium; L ２ represents a substituted or unsubstituted (C ６ to C ３０ ) arylene; Ar ２ The following equation 1-1: 【Chemistry 2】 (In the formula, R' １ ~R' １０ Each is independently hydrogen, deuterium, or unsubstituted or deuterium-substituted (C ６ ~C ３０ ) Represents the aryl, R' １ ~R' １０ One of them is L ２ (It is connected to the other side.) It is represented by; 【Transformation 3】 During the ceremony, Ar １１ is either substitution or non-substitution (C ６ ~C ３０ ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; L １１ This is a single bond, substitution, or non-substitution (C ６ ~C ３０ ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; R １１ ~R １８ Each of these independently represents either hydrogen or deuterium; L １２ is a single bond or substitution or non-substitution (C ６ ~C ３０ ) Represents arrine; Ar １２ This is shown in equation 2-1 below: 【Chemistry 4】 (In the formula, X is either O or S; R' １１ ~R' １８ Each is independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C) １ ~C ３０ ) alkyl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C ６ ~C ３０ ) Represents an aryl or a combination thereof; or may bond with adjacent substituents to form a ring; R' １１ ~R' １８ One of them is L １２ (It is connected to the other side.) Multiple host materials represented by [the specified format].

2. Ar １ This represents unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, or combinations thereof; L １ and L ２ Each of these independently represents a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, or an unsubstituted or deuterium-substituted naphthylene; R' １ ~R' １０ The plurality of host materials according to claim 1, wherein each independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, or a combination thereof.

3. Ar １１ This includes unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenantrenyl, unsubstituted or deuterium-substituted dimethylfluorenyl, unsubstituted or deuterium-substituted diphenylfluorenyl, unsubstituted or deuterium-substituted dimethylbenzofluorenyl, and unsubstituted or deuterium-substituted diphenylbenzofluorenyl. Represents orenyl, unsubstituted or deuterium-substituted spirobifluorenyl, unsubstituted or deuterium-substituted triphenylenyl, unsubstituted or deuterium-substituted carbazolyl, unsubstituted or deuterium-substituted benzocarbazolyl, unsubstituted or deuterium-substituted dibenzofuranil, unsubstituted or deuterium-substituted benzonaphthofuranil, unsubstituted or deuterium-substituted dibenzothiophenyl, unsubstituted or deuterium-substituted benzonaphthothiophenyl, or combinations thereof; L １１ and L １２ Each of these independently represents a single bond, an unsubstituted or deuterium-substituted phenylene, an unsubstituted or deuterium-substituted biphenylene, an unsubstituted or deuterium-substituted terphenylene, an unsubstituted or deuterium-substituted naphthylene, or an unsubstituted or deuterium-substituted carbazoylene. R' １１ ~R' １８ Each independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, unsubstituted or deuterium-substituted terphenyl, unsubstituted or deuterium-substituted naphthyl, unsubstituted or deuterium-substituted phenanthrenyl, or a combination thereof; or can bond with adjacent substituents to form an unsubstituted or deuterium-substituted benzene ring. A plurality of host materials according to claim 1.

4. A plurality of host materials according to claim 1, wherein at least one of formulas 1 and 2 contains deuterium.

5. The substituted alkyl, the substituted aryl, the substituted arylene, the substituted heteroaryl, the substituted heteroarylene, the substituted cycloalkyl, the substituted condensed ring group of an aliphatic ring and an aromatic ring, the substituted arene, and the substituted heteroarene are each independently deuterium, halogen, cyano, carboxyl, nitro, hydroxyl, phosphine oxide group, (C １ -C ３０ )alkyl, halo(C １ -C ３０ )alkyl, (C ２ -C ３０ )alkenyl, (C ２ -C ３０ )alkynyl, (C １ -C ３０ )alkoxy, (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, (3-30 member)heteroaryl, (C ６ -C ３０ )aryl, tri(C １ -C ３０ )alkylsilyl, tri(C ６ -C ３０ )arylsilyl, di(C １ -C ３０ )alkyl(C ６ -C ３０ )arylsilyl, (C １ -C ３０ )alkyldi(C ６ -C ３０ )arylsilyl, amino, mono- or di(C １ -C ３０ )alkylamino, mono- or di(C ２ -C ３０ )alkenylamino, mono- or di(C ６ -C ３０ ), arylamino, mono- or di(3- to 30-membered) 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- to 30-membered) heteroarylamino, (C ２ -C ３０ ), alkenyl(C ６ -C ３０ ), arylamino, (C ２ -C ３０ ), alkenyl(3- to 30-membered) heteroarylamino, (C ６ -C ３０ ), aryl(3- to 30-membered) heteroarylamino, (C １ -C ３０ ), alkylcarbonyl, (C １ -C ３０ ), alkoxycarbonyl, (C ６ -C ３０ ), arylcarbonyl, di(C ６ -C ３０ ), arylboronyl, (C ６ -C ３０ ), arylphosphinyl, 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, (C １ -C ３０ ), alkyl(C ６ -C ３０ ), aryl, and at least one selected from the group consisting of combinations thereof, each of which may be further substituted with deuterium, the plurality of host materials according to claim 1.

6. 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】 (In the formula, D ｎ This means that n hydrogen atoms are substituted with deuterium, where n is an integer from 1 to the maximum number of hydrogen atoms in the compound. A plurality of host materials according to claim 1, wherein at least one is selected from the following.

7. The compound represented by formula 2 is the following compound: 【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】 【Chemistry 31】 【Chemistry 32】 【Transformation 33】 【Transformation 34】 【Chemistry 35】 【Transformation 36】 【Chemistry 37】 【Transformation 38】 (In the formula, D ｎ This means that n hydrogen atoms are substituted with deuterium, where n is an integer from 1 to the maximum number of hydrogen atoms in the compound. A plurality of host materials according to claim 1, wherein at least one is selected from the following.

8. An organic electroluminescent element comprising an anode; a cathode; and at least one light-emitting layer between the anode and the cathode, wherein the at least one light-emitting layer comprises a plurality of host materials as described in claim 1.

9. The following equation 1-a: 【Chemistry 39】 [In the formula, R ５０ ~R ６１ Each of these independently represents hydrogen, deuterium, the following formula 1-b, or the following formula 1-c, provided that R ５０ ~R ６１ At least one of them is either formula 1-b or formula 1-c: 【Chemistry 40】 (In the formula, R ６２ ~R ６５ and R ６８ Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R ６２ ~R ６５ and R ６８ At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl; R ６６ and R ６７ Each of these independently represents either hydrogen or deuterium; R ６９ ~R ７５ Each of these independently represents hydrogen, deuterium, unsubstituted or deuterium-substituted phenyl, unsubstituted or deuterium-substituted biphenyl, or unsubstituted or deuterium-substituted naphthyl, R ６９ ~R ７５ At least one of these represents an unsubstituted or deuterium-substituted phenyl, an unsubstituted or deuterium-substituted biphenyl, or an unsubstituted or deuterium-substituted naphthyl. [Assuming that it represents] An organic electroluminescent compound represented by [the specified formula].

10. The compound represented by formula 1-a is the following compound: 【Chemistry 41】 【Chemistry 42】 【Chemistry 43】 【Chemistry 44】 【Chemistry 45】 (In the formula, D ｎ This means that n hydrogen atoms are substituted with deuterium, where n is an integer from 1 to the maximum number of hydrogen atoms in the compound. An organic electroluminescent compound according to claim 9, selected from the above.

11. An organic electroluminescent element comprising an anode; a cathode; 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, wherein the first light-emitting layer comprises the organic electroluminescent compound described in claim 9, the second light-emitting layer comprises at least two different compounds comprising an anthracene skeleton, and the first light-emitting layer and the second light-emitting layer are in direct contact.

12. Equation 2-a below: 【Chemistry 46】 [In the formula, Ar １１ is either substitution or non-substitution (C ６ ~C ３０ ) represents an aryl or a substituted or unsubstituted (3-30 member) heteroaryl; L １１ This is a single bond, substitution, or non-substitution (C ６ ~C ３０ ) represents arylene, or substituted or unsubstituted (3-30 member) heteroarylene; R １１ ~R １８ Each of these independently represents either hydrogen or deuterium; L １２ is a single bond or substitution or non-substitution (C ６ ~C ３０ ) Represents arrine; Ar １２ This is the following equation 2-b: 【Chemistry 47】 (In the formula, X is either O or S; R' １１ ~R' １８ Each is independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C) １ ~C ３０ ) alkyl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C ６ ~C ３０ ) Represents an aryl or a combination thereof; or may bond with adjacent substituents to form a ring; R' １１ ~R' １３ One of them is L １２ It is connected to; L １２ R' is not based on １１ ~R' １３ The remainder and R' １４ ~R' １８ At least one of them is either substituted or non-substituted (C １ ~C ３０ ) alkyl, substituted or unsubstituted (C ３ ~C ３０ ) Cycloalkyl, substituted or unsubstituted (C ６ ~C ３０ ) Aryl, substituted or unsubstituted (C ６ ~C ３０ (A heteroaryl compound, or a combination thereof) [represented by] An organic electroluminescent compound represented by [the specified formula].

13. The compound represented by formula 2-a is the following compound: 【Chemistry 48】 【Chemistry 49】 (In the formula, D ｎ In this equation, n represents the number of substituted deuterium atoms, and n represents a number from 0 to the maximum number of deuterium atoms in the compound, where n being 0 represents a hydrogen compound. An organic electroluminescent compound according to claim 12, selected from the above.

14. An organic electroluminescent element comprising an anode; a cathode; 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, wherein the second light-emitting layer comprises the organic electroluminescent compound described in claim 12, and the first light-emitting layer and the second light-emitting layer are in direct contact.

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