Compound for organic EL device and organic EL device

Abstract

The invention provides a compound for an organic EL device, which functions as a light-emitting dopant in a light-emitting layer, as a material for forming light-emitting layer, particularly capable of exhibiting higher luminous efficiency and longer life time, and an organic EL device using the same. A compound for an organic EL device as a light-emitting material for use in an organic EL deviceis provided. The compound includes a polymer molecule containing a light-emitting molecule for determining a luminescent color region of the light-emitting material, and molecules represented by Formulas (1) to (4) as constituent units. (wherein R represents an alkyl group, an aryl group, or an alkylaryl group) (wherein R' represents hydrogen, an alkyl group, or an alkylaryl group.

Description

technical field The present invention relates to an organic EL device used for a display, a display light source, and the like. Specifically, it relates to a compound for organic EL preferably used in a coating-type organic EL device and an organic EL device using the same. Background technique In recent years, the development of organic electroluminescent devices (organic EL devices) using organic electroluminescent elements (organic EL elements) as self-luminous displays replacing liquid crystal displays has been accelerated. As such an organic EL device and its manufacturing method, techniques such as Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4 are known. However, conventionally, in an organic EL device (organic EL device), it is known to use a host material and a light-emitting dopant as a material composition of a light-emitting layer for realizing high-efficiency light emission, a change in light-emitting color, and a long life. Tec...

AI Technical Summary

Problems solved by technology

(2) In an organic EL device in which a light-emitting dopant is not used in combination with a light-emitting dopant, light emission from the host material is observed, but when a light-emitting dopant and a host material are used in combination, light emission from the host material is hardly observed , becomes the predominantly light-emitting dopant emitting

(2) The function of trapping holes and electrons of light-emitting dopant materials is low

(3) The development of luminescent dopant materials is late

This is due to the following two reasons. In the field of polymer-coated organic EL devices, the effect of the host + light-emitting dopant system is smaller than that of vapor deposition-based EL (low-molecular EL), so the development of materials is late.

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