title: Managing Excitons and Charges for High-Performance Fluorescent White Organic Light-Emitting Diodes.
abstract: The simultaneous realization of high efficiency, stable spectra, high color rendering index (CRI), and low-efficiency roll-off in a fluorescent white organic light-emitting diode (WOLED) still remains a big challenge. Here, we demonstrate high-performance conventional fluorescent-dopant-based WOLEDs by strategic management of singlet and triplet excitons within an efficient emissive zone. This design consists of two separated red/green sub-EMLs with ultralow doping concentration and a sandwiched sub-EML doped with red and green fluorescent dyes at a relatively high concentration, which can harness all electrogenerated excitons and reduce the energy loss to the utmost extent. Accordingly, the resulting WOLED realizes an external quantum efficiency (EQE) of 18.2% with a maximum power efficiency of 44.6 lm W-1. At the practical luminance of 1000 cd m-2for the lighting source, the EQE still remains as high as 16.2% with a CRI of 82 and stable color spectra. A comprehensive understanding of the device working mechanism is performed to guide design of efficient and stable fluorescent WOLEDs.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences , Changchun 130022, P. R. China.
authors.forename: Zhongbin
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.affiliation: 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.
authors.forename: Ling
authors.initials: L
authors.lastname: Yu
authors.affiliation: 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.
authors.forename: Jiangshan
authors.initials: J
authors.lastname: Chen
authors.affiliation: 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.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Qiao
authors.affiliation: Department of Chemistry, King Saud University , Riyadh 11451, Kingdom of Saudi Arabia.
authors.forename: Tansir
authors.initials: T
authors.lastname: Ahamad
authors.affiliation: Department of Chemistry, King Saud University , Riyadh 11451, Kingdom of Saudi Arabia.|Department of Chemistry, College of Science & General Studies, Alfaisal University , Riyadh 11451, Kingdom of Saudi Arabia.
authors.forename: Saad M
authors.initials: SM
authors.lastname: Alshehri
authors.affiliation: 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.
authors.forename: Chuluo
authors.initials: C
authors.lastname: Yang
authors.affiliation: 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.|Department of Chemistry, King Saud University , Riyadh 11451, Kingdom of Saudi Arabia.
authors.forename: Dongge
authors.initials: D
authors.lastname: Ma
keywords: conventional fluorescent dopant; exciton management; fluorescent white organic light-emitting diodes; high performance; host−guest synergistic effect