Nitrogen heterocyclic, display panel, and display device

Abstract

The invention provides a nitrogen heterocyclic. The nitrogen heterocyclic possesses a structure represented by chemical formula I, wherein z is 1 or 2; m and n are 1 or 2 respectively; p and q are 0,1, or 2 respectively; X1 to X6 are used for representing elements independently selected from N or C, and at least one from X1 to X6 is used for representing N; R1, R2, and R3 are used for representing C1-C10 straight chain or branched chain alkyl, substituted or non-substituted aromatic groups, fused aryl, aromatic heterocyclic, and fused aromatic heterocyclic independently; R1 and R2 are used for representing single bond; Ar1 and Ar2 are used for representing substituted or non-substituted aromatic groups, fused aryl, aromatic heterocyclic, and fused aromatic heterocyclic independently. Thenitrogen heterocyclic is relatively high in refractive rate; when the nitrogen heterocyclic is used in CPL cap layer of OLED devices, the top emission OLED light extraction efficiency and luminescenceefficiency can be increased (especially effective on blue light pixel), and OLED device luminescence angle dependency is alleviated (especially effective on red / green light pixel).

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescence 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. ...

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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