journal article·2017-12

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

Ling Yu, Zhongbin Wu, Cheng Zhong, Guohua Xie, Zece Zhu, Dongge Ma, Chuluo Yang

Advanced Optical Materials· Volume 5· Issue 24
Publisher page

Abstract

Abstract 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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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of Chemistry Wuhan University Wuhan 430072 P. R. China

State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry University of Chinese Academy of Sciences Changchun 130022 P. R. China

Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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