Condensed ring aromatic amine compound and organic electroluminescent display device comprising same

Abstract

The invention discloses a condensed ring aromatic amine compound and an organic electroluminescent display device comprising the same, and belongs to the technical field of organic electroluminescent materials. The condensed ring aromatic amine compound has a structure represented by the formula, wherein A and B respectively have structures represented by the formulas defined in the specification, L1, L2 and L3 are respectively and independently selected from a single bond, substituted or unsubstituted arylene with the ring-forming carbon atom number of 5-60 and substituted or unsubstituted heteroarylene with the ring-forming carbon atom number of 5-60, and X is independently selected from O, C, N or S atoms; and at least any two adjacent groups of R1 to R16 and R17 to R20 are bonded to each other to form a ring structure. The condensed ring aromatic amine compound has a large conjugate plane, the stability of the compound can be improved, an organic electroluminescent display device obtained by adopting the compound as a hole transport layer material can reduce the problem of crosstalk of light emitting display, the driving voltage is low, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence materials, and in particular relates to condensed ring aromatic amine compounds and organic electroluminescence display devices containing them. Background technique [0002] At present, organic electroluminescent display devices (OLED) are mainly composed of anode, hole transport layer, light emitting layer, electron transport layer and cathode, and the material of hole transport layer is mainly composed of aromatic polyamine, aromatic diamine or aromatic monoamine. . The compound structure of aromatic polyamine or aromatic diamine has high mobility characteristics, but the mobility in the horizontal and vertical directions is relatively high, and it is easy to form a crosstalk problem, that is, when the panel display uses R, G, and B pixels for display, due to the common transmission layer, the holes will cross the light-emitting layer of color A and enter the light-emitting...

AI Technical Summary

Problems solved by technology

The compound structure of aromatic polyamine or aromatic diamine has high mobility characteristics, but the mobility in the horizontal and vertical directions is relatively high, and it is easy to form a crosstalk problem, that is, when the panel display uses R, G, and B pixels for display, due to the common transmission Layer, the holes will cross the light-emitting layer of color A and enter the light-emitting layer of color B, which will cause the color B to "steal bright".

Aromatic monoamine compounds can reduce the lateral and vertical mobility to a certain extent and slow down the crosstalk problem, but the decrease in mobility will lead to an increase in driving voltage

In the prior art, some people try to use a compound formed by combining carbazole and aromatic monoamine with a certain mobility as a hole transport material, but this material has the problem of insufficient conjugated planes, which leads to insufficient stability of the amine, resulting in a reduced service life.

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