Tetradentate Pt(Ⅱ) Complex Sensitized Multi-resonant Thermally Activated Delayed Fluorescence for Narrow Bandwidth Blue Solution-processed OLEDs; [基于四配位铂配合物敏化多重共振热激活延迟荧光的窄发射蓝色溶液加工有机发光二极管]

被引：0

作者：

Li J. ^{[1
]}

Fang H. ^{[1
]}

Gong S. ^{[1
]}

Xie G. ^{[1
,2
]}

机构：

[1] Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan

[2] The Institute of Flexible Electronics（Future Technologies）, Xiamen University, Xiamen

来源：

Faguang Xuebao/Chinese Journal of Luminescence | 2024年 / 45卷 / 05期

基金：

中国国家自然科学基金;

关键词：

narrow bandwidth; multi-resonance; organic light-emitting diodes; phosphorescent sensitizer; thermally activated delayed fluorescence;

D O I：

10.37188/CJL.20240049

中图分类号：

学科分类号：

摘要：

Although organic light-emitting diodes （OLEDs） have been commercialized and become popular in smartphone，the vacuum deposition process makes them too expensive for mass production and less cost-effective. Herein，we employed highly emissive platinum complex as the sensitizer and multi-resonant thermally activated delayed fluorescence（MR-TADF）molecules as the emitters to demonstrate highly efficient，high color purity，and solution-processed OLEDs with the alleviated efficiency roll-offs. The triplet excitons are rapidly converted to singlet excitons assisted by the phosphorescent sensitizer. Attributed to the reduced triplet exciton lifetime induced by the phosphorescent sensitizer，the MR-TADF OLEDs exhibited a maximum external quantum efficiency （EQE） of 13. 2% with a low efficiency roll-off of 25. 8% at 1 000 cd/m2. To reduce Dexter energy transfer between phosphorescence sensitizer and the emitter，an analogue TADF emitter with the peripheral bulky blocking units was employed，which rendered an improved maximum EQE of 13. 6%. This investigation presents a general approach to realize high-performance solution-processed electroluminescence. © 2024 Editorial Office of Chinese Optics. All rights reserved.

引用

页码：699 / 710

页数：11