Composition material for organic electroluminescent device, plurality of host materials, and organic electroluminescent device comprising the same

Abstract

The present disclosure relates to a composition material for an organic electroluminescent device, a plurality of host materials, and an organic electroluminescent device comprising the same. By comprising the composition material for an organic electroluminescent device comprising a specific combination of compounds, an organic electroluminescent device having high luminous efficiency and/or long lifespan characteristics can be produced.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a composition material for an organic electroluminescent device, a plurality of host materials, and an organic electroluminescent device comprising the same.BACKGROUND ART[0002]A small molecular green organic electroluminescent device (OLED) was first developed by Tang, et al., of Eastman Kodak in 1987 by using TPD / ALq3 bi-layer consisting of a light-emitting layer and a charge transport layer. Thereafter, the development of OLEDs was rapidly effected and OLEDs have been commercialized. At present, OLEDs primarily use phosphorescent materials having excellent luminous efficiency in panel implementation. An OLED having high luminous efficiency and / or long lifespan characteristics is required for prolonged use and high resolution of a display.[0003]U.S. Pat. No. 6,902,831 discloses an azulene derivative as an organic electroluminescent compound, and Korean Patent Application Laid-Open Nos. 2016-0022784 and 2017-0001563 disclose an...

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Benefits of technology

[0018]By using the composition material for an organic electroluminescent device according to the present disclosure, an organic electroluminescent device having high luminous efficiency and/or long lifespan characteristics can be produced.

[0019]Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the disclosure, and it is not meant in any way to restrict the scope of the disclosure.

[0020]The term “a composition material for an organic electroluminescent device” in the present disclosure means that at least two materials, which may be used in an organic electroluminescent device, are present together or are prepared so as to be present together. Herein, “being present together” means not only that at least two materials are mixed, but also that at least two materials are separated from each other. In addition, the composition material for an organic electroluminescent device is a concept encompassing a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) as well as a material after being comprised in an organic electroluminescent device (for example, after vapor deposition). For example, the composition material for an organic electroluminescent device may comprise at least two among a hole injection material, a hole transport material, a hole auxiliary material, alight-emitting auxiliary material, an electron blocking material, a light-emitting material (a host material and/or a dopant material), an electron buffer material, a hole blocking material, an electron transport material, and an electron injection material. The composition material for an organic electroluminescent device may comprise at least two hole injection materials, at least two hole transport materials, at least two hole auxiliary materials, at least two light-emitting auxiliary materials, at least two electron blocking materials, at least two light-emitting materials (host materials and/or dopant materials), at least two electron buffer materials, at least two hole blocking materials, at least two electron transport materials, and/or at least two electron injection materials. The composition material for an organic electroluminescent device of the present disclosure may be comprised in any layer constituting an organic electroluminescent device. At least two materials comprised in the composition material may be comprised together in one layer or may be comprised in different layers, respectively. When at least two materials are comprised in one layer, they may be mixture-evaporated to form a layer, or may be co-evaporated separately at the same time to form a layer.

[0021]The term “a plurality of host materials” in the present disclosure means a host material comprising a combination of at least two compounds, which may be comprised in any light-emitting layer constituting an organic electroluminescent device. It may mean both a material before being comprised in an organic electroluminescent device (for example, before vapor deposition) and a material after being comprised in an organic electroluminescent device (for example, after vapor deposition). For example, a plurality of host materials of the present disclosure may be a combination of at least two host materials, and selectively may further comprise the conventional materials comprised in an organic electroluminescent material. At least two compounds comprised in a plurality of host materials of the present disclosure may be comprised together in one light-emitting layer or may respectively be comprised in different light-emitting layers by the method used in the art. For example, the at least two compounds may be mixture-evaporated or co-evaporated, or may be individually evaporated.

[0022]Herein, “(C1-C30)alkyl” is meant to be a linear or branched alkyl having 1 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 1 to 10, more preferably 1 to 6, and includes methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc. “(C3-C30)cycloalkyl” is meant to be a mono- or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, in which the number of carbon atoms is preferably 3 to 20, more preferably 3 to 7, and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. “(3- to 7-membered)heterocycloalkyl” is meant to be a cycloalkyl having at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, preferably selected from the group consisting of O, S, and N, and 3 to 7 ring backbone atoms, and includes tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, etc. “(C6-C30)aryl(ene)” is meant to be a monocyclic or fused ring radical derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms and may be partially saturated, in which the number of ring backbone carbon atoms is preferably 6 to 20, more preferably 6 to 15, and includes phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, phenylterphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, azulenyl, etc. More specifically, the above aryl may include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthryl group, a 2-anthryl group, a 9-anthryl group, a benzanthryl group, a 1-phenanthryl group, a 2-phenanthryl group, a 3-phenanthryl group, a 4-phenanthryl group, a 9-phenanthryl group, a naphthacenyl group, a pyrenyl group, a 1-chrysenyl group, a 2-chrysenyl group, a 3-chrysenyl group, a 4-chrysenyl group, a 5-chrysenyl group, a 6-chrysenyl group, a benzo[c]phenanthryl group, a benzo[g]chrysenyl group, a 1-triphenylenyl group, a 2-triphenylenyl group, a 3-triphenylenyl group, a 4-triphenylenyl group, a 1-fluorenyl group, a 2-fluorenyl group, a 3-fluorenyl group, a 4-fluorenyl group, a 9-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a 2-biphenylyl group, a 3-biphenylyl group, a 4-biphenylyl group, an o-terphenyl group, an m-terphenyl-4-yl group, an m-terphenyl-3-yl group, an m-terphenyl-2-yl group, a p-terphenyl-4-yl group, a p-terphenyl-3-y

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