Azacyclo-compound, display panel and display device

Abstract

The invention provides an azacyclo-compound having the structure shown in the chemical formula 1. In the formula 1, X1 to X6 independently represent N or C atoms, at least one of X1 to X6 is an N atom, m and n independently represent 0, 1 or 2, m+n is greater than 1, R1 represents a hydrogen atom, a C1-C10 linear or branched alkyl group, a substituted or unsubstituted phenyl group, a diphenyl group, a terphenyl group, a pyridyl group, a naphthyl group or an anthracenyl group, Ar is selected from a dimethyl fluorene group, a phenyl group and a carbazolyl group, and Ar1 and Ar2 independently represent a substituted or unsubstituted benzimidazole group. The azacyclo-compound has a high refractive index, when the azacyclo-compound is used as a CPL cap layer of an organic light-emitting and display device (such as an OLED), light extraction efficiency and luminous efficiency of the top emission organic photoelectric device can be improved, and the angular dependence of OLED device illumination is reduced. The azacyclo-compound has a small extinction coefficient in the blue region and almost no absorption of blue light and improves luminous efficiency.

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescent materials, in particular to a nitrogen heterocyclic compound, a display panel and a display device comprising the nitrogen heterocyclic compound. Background technique [0002] After decades of development, OLED has come a long way. Although its internal quantum efficiency is close to 100%, its external quantum efficiency is only about 20%. Most of the light is confined inside the light-emitting device due to factors such as substrate mode loss, surface plasmon loss, and waveguide effect, resulting in a large amount of energy loss. [0003] In top-emitting devices, an organic capping layer (CappingLayer, CPL) is usually evaporated on the semi-transparent metal electrode Al to adjust the optical interference distance, suppress the reflection of external light, and suppress the extinction caused by the movement of surface plasmons, thereby improving the light intensity. E...

AI Technical Summary

Problems solved by technology

However, the refractive index of the existing CPL materials is generally below 1.9, which cannot meet the requirements of high refractive index; amine derivatives with a specific structure with high refractive index and the use of materials that meet specific parameters improve the light extraction efficiency, but there is no solution. The problem of luminous efficiency (especially for blue light emitting elements)

In order to increase the molecular density and achieve high thermal stability of the materials in the prior art, the molecular structure is designed to be large and loose, and the molecules cannot be tightly packed, resulting in too many holes in the molecular gel during evaporation. Poor coverage

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