Constructing a novel single-layer white organic light-emitting device through a new sky-blue fluorescent bipolar host |
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| Authors: | Jun Ye Kai Wang Zhan Chen Fei-Fei An Yi Yuan Chi Zhang Xiao-Hong Zhang Chun-Sing Lee |
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| Affiliation: | 1. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong Special Administrative Region;2. China–Australia Joint Research Center for Functional Molecular Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China;3. 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, PR China |
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| Abstract: | A novel device concept was realized for simple single-layer small-molecule white organic light emitting devices. The single organic active layer here is simply comprised of a newly synthesized sky-blue fluorescent bipolar host (TPASO) and a common orange phosphorescent dopant. Suppressed singlet Föster energy transfer induced by a low-concentration doping and spontaneous high- to low-lying triplet energy transfer, respectively, lead to sky-blue fluorescence from TPASO and orange phosphorescence from the dopant. The resulting two-organic-component device exhibits a low turn-on voltage of 2.4 V, maximum current/power efficiencies up to 11.27 ± 0.02 cd A−1 and 14.15 ± 0.03 lm W−1, and a warm-white CIE coordinate of (0.42, 0.45) at 1000 cd m−2. |
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| Keywords: | White organic light emitting device Single layer Bipolar host Blue fluorescence Fluorescence and phosphorescence hybrid |
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