journal article·2016-12-07

High Performance All Fluorescence White Organic Light Emitting Devices with a Highly Simplified Structure Based on Thermally Activated Delayed Fluorescence Dopants and Host

Wei Liu, Cai-Jun Zheng, Kai Wang, Ming Zhang, Dong-Yang Chen, Si-Lu Tao, Fan Li, Yu-Ping Dong, Chun-Sing Lee, Xue-Mei Ou, Xiao-Hong Zhang

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Abstract

Thermally activated delayed fluorescence (TADF) emitters of different colors commonly need different hosts, which cause the complexed device structure and low efficiency of all fluorescence white organic light-emitting devices (F-WOLEDs). To solve this, novel concept of employing TADF exciplex as universal host of TADF emitters with different colors was proposed. All blue, green, and orange devices based on the TADF exciplex host show much lower turn-on voltages, and comparable and even higher efficiencies than corresponding devices based on conventional hosts. The two color F-WOLED with extremely simplified device structure was finally fabricated, achieving a white emission with the maximum current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE) respectively of 50.1 cd A –1, 63.0 lm W −1, and 19.0% in the forward-viewing direction without any light out-coupling technology, which is the best performance among reported F-WOLEDs, demonstrating the superiority of the novel concept.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Thin-Film Transistor Technologies

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

Affiliations

School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P.R. China

Nano-organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China

College of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, P.R. China

Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, P.R. China

Funding

National Natural Science Foundation of China · Beijing Nova Program · Jiangsu Province · Collaborative Innovation Center of Suzhou Nano Science and Technology · Priority Academic Program Development of Jiangsu Higher Education Institutions

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