Title:
ORGANIC ELECTROLUMINESCENT DEVICE, DISPLAY PANEL, AND DISPLAY APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/062699
Kind Code:
A1
Abstract:
Provided are an organic electroluminescent device, a display panel, and a display apparatus. An exciton layer adjacent to a light-emitting layer is added, and the exciton layer serves as an exciton recombination region and achieves the effect of increasing the density of excitons, wherein the singlet-state energy level of the exciton layer is higher than the singlet-state energy level of a host material in the light-emitting layer, and an emission spectrum of the exciton layer and an absorption spectrum of the host material in the light-emitting layer have an overlapping area, so that energy of excitons formed in the exciton layer can be effectively transferred to the host material and a guest material of the light-emitting layer, and the light-emitting efficiency of the light-emitting layer is improved. Moreover, the exciton layer has the performance of triplet-state excitons formed in the exciton layer forming singlet-state excitons by means of reverse intersystem crossing, so that the exciton layer transfers exciton energy to the energy level of the host material by means of Forrest energy transfer with a lower energy loss, and Dexter energy transfer with a greater energy loss is inhibited, thereby being able to effectively improve exciton energy transfer, and enhancing the efficiency of the organic electroluminescent device.
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Inventors:
WU YONG (CN)
Application Number:
PCT/CN2021/110673
Publication Date:
March 31, 2022
Filing Date:
August 04, 2021
Export Citation:
Assignee:
BOE TECHNOLOGY GROUP CO LTD (CN)
International Classes:
H01L51/50
Foreign References:
| CN112117388A | 2020-12-22 | |||
| CN105870347A | 2016-08-17 | |||
| CN108039417A | 2018-05-15 | |||
| CN107808931A | 2018-03-16 | |||
| CN109817836A | 2019-05-28 | |||
| JP2020140956A | 2020-09-03 |
Attorney, Agent or Firm:
TDIP & PARTNERS (CN)
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