title: High Performance All Fluorescence White Organic Light Emitting Devices with a Highly Simplified Structure Based on Thermally Activated Delayed Fluorescence Dopants and Host.
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.
authors.affiliation: 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.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: 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.
authors.forename: Cai-Jun
authors.initials: CJ
authors.lastname: Zheng
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou, Jiangsu 215123, 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.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P.R. China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou, Jiangsu 215123, 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.
authors.forename: Dong-Yang
authors.initials: DY
authors.lastname: Chen
authors.affiliation: School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P.R. China.
authors.forename: Si-Lu
authors.initials: SL
authors.lastname: Tao
authors.affiliation: 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.
authors.forename: Fan
authors.initials: F
authors.lastname: Li
authors.affiliation: College of Materials Science and Engineering, Beijing Institute of Technology , Beijing, 100081, P. R. China.
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Dong
authors.affiliation: 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.
authors.forename: Chun-Sing
authors.initials: CS
authors.lastname: Lee
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou, Jiangsu 215123, 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.
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Ou
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou, Jiangsu 215123, 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.
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Zhang
keywords: WOLEDs; all fluorescence; exciplex; reverse intersystem crossing; thermally activated delayed fluorescence