Pure Organic Emitter with Simultaneous Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence: Thermal-Controlled Triplet Recycling Channels

被引：57
|
作者：
Yu, Ling [1 ]
Wu, Zhongbin [2 ]
Zhong, Cheng [1 ]
Xie, Guohua [1 ]
Zhu, Zece [1 ]
Ma, Dongge [2 ,3 ]
Yang, Chuluo [1 ]
机构：
[1] Wuhan Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Hubei Key Lab Organ & Polymer Optoelect Mat, Dept Chem, Wuhan 430072, Hubei, Peoples R China
[2] Univ Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Changchun Inst Appl Chem, Changchun 130022, Jilin, Peoples R China
[3] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
来源：
ADVANCED OPTICAL MATERIALS | 2017年 / 5卷 / 24期
基金：
中国国家自然科学基金;
关键词：
organic light-emitting diodes; room-temperature phosphorescence; thermally activated delayed fluorescence; threshold temperature; CRYSTALLIZATION-INDUCED PHOSPHORESCENCE; HIGHLY EFFICIENT; ELECTRONIC-STRUCTURE; SINGLET; BLUE; GREEN; ELECTROLUMINESCENCE; DERIVATIVES; RED; COMPLEXES;
D O I：
10.1002/adom.201700588
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new route to utilize the triplet excitons by simultaneous thermally activated delayed fluorescence (TADF) and phosphorescence is demonstrated for a new quinoxaline/phenoxazine hybrid emitter. Moreover, the two triplet recycling channels are thermally controlled, and a clear threshold temperature of 170 K is observed. Below the threshold temperature, direct triplet radiation (phosphorescence) is the dominant process. In contrast, the channel of upconversion through intersystem crossing is activated above the threshold and the resulting TADF gradually becomes the predominant process. By using the new compound as emitter in organic light-emitting diodes, a high external quantum efficiency of 16.8% is far beyond the theoretical limit of the traditional fluorescent emitters.
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页数：8
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