charge transport varnish

Abstract

A charge-transporting substance comprising an arylamine derivative represented by the formula (1) exhibits good solubility in an organic solvent, when a film made of a charge-transporting varnish containing the charge-transporting substance is applied to a hole When the layer is injected, an organic EL element having excellent luminance characteristics can be realized. [In the formula, R 1 ~R 8 denote hydrogen atoms etc. independently of each other; Ar 1 represents a phenyl group, etc.; n represents an integer of 1 to 3; and X represents a divalent organic group represented by formula (2a) or (2b). (where, R 9 and R 10 Each independently represents an alkyl group with 1 to 20 carbon atoms; R 11 and R 12 independently represent a hydrogen atom or a fluorine atom; R 13 ~R 20 Each independently represents a hydrogen atom, etc.; m represents an integer of 1-4. )]

Description

technical field

[0001] The present invention relates to charge-transporting varnishes. Background technique

[0002] In an organic electroluminescent (hereinafter referred to as organic EL) device, a charge-transporting thin film containing an organic compound can be used as a light-emitting layer or a charge injection layer. In particular, the hole-injection layer is responsible for the exchange of charge between the anode and the hole-transport layer or the light-emitting layer, and plays an important function for realizing low-voltage drive and high-luminance of the organic EL element.

[0003] The methods for forming charge transport thin films are roughly divided into dry methods represented by vapor deposition and wet methods represented by spin coating methods. Comparing these methods, the wet method can efficiently produce large-area and excellent flatness. film. Therefore, a hole injection layer that can be formed by a wet method is desired at the present time whe...

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