Organic electroluminescence device

Abstract

The invention relates to an organic electroluminescence device. The device comprises a substrate, a first electrode layer, multiple organic layers and a second electrode layer, wherein the first electrode layer, the multiple organic layers and the second electrode layer are sequentially formed on the substrate, each organic layer comprises a hole transfer layer, a light emitting material layer and an electron transfer layer which are arranged on the first electrode layer in sequence, a hole / exciton barrier layer is arranged between each light emitting material layer and the corresponding electron transfer layer and comprises an organic barrier material and an electron transfer material doped in the organic barrier material, the triplet state energy level T1 of the organic barrier material is larger than that of the main material and that of the dye in the light emitting material layer, the LUMO energy level of the electron transfer material is larger than that of the organic barrier material, and the singlet state energy level of the electron transfer material is larger than that of the main material and that of the dye in the light emitting material layer. Due to the fact that the composite material is adopted for the hole / exciton barrier layer, exciton quenching and inactivation can be effectively prevented, electron mobility can be improved, and then the efficiency of the device is improved and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to an organic electroluminescent device provided with a hole / exciton blocking layer. Background technique [0002] The light-emitting layer of the organic electroluminescent device OLED is mainly made of all fluorescent materials, all phosphorescent materials or a mixture of fluorescent materials and phosphorescent materials. Phosphorescent materials can achieve high luminous efficiency, but due to short lifetime and low efficiency, no suitable blue phosphorescent materials have been developed yet. Although the chromaticity and lifetime of the all-fluorescent material have strong advantages, the efficiency of the structure mixed with the all-phosphorescent material layer is low. At present, blue fluorescent materials and red-green phosphorescent materials are generally used together as the light-emitting layer of the OLED. [0003] In the manufacturing p...

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Problems solved by technology

[0010] For this reason, the technical problem to be solved by the present invention lies in the problem of low electron mobility of the exciton / exciton blocking layer in the prior art, and then provides an organic electroluminescent device, whose hole / exciton blocking layer includes an organic barrier The material and the electron transport material doped in the organic barrier material can effectively prevent exciton quenching and deactivation, improve electron mobility, thereby improving the efficiency and life of the organic electroluminescent device

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