D–π–A polysulfones for blue electroluminescence |
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| Authors: | ZhongMin Geng Go Sato Kazuhiro Marumoto Masashi Kijima |
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| Institution: | 1. Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan;2. Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba, Ibaraki, Japan;3. Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan;4. Algae Biomass and Energy System R&D Center (ABES), University of Tsukuba, Tsukuba, Ibaraki, Japan;5. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan |
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| Abstract: | Donor–π–acceptor type fluorene‐based copolymers with a sulfone unit were designed and synthesized for application in efficient pure‐blue light emitting. The electroluminescence behaviors of these copolymers were investigated by fabricating light‐emitting diodes and electrochemical cell devices. The former device little functioned but the latter worked well. The electrochemical cell devices having a configuration of ITO/PEDOT:PSS/copolymer:ionic liquid/Al exhibited purplish blue electroluminescence with an emission maximum at 434 nm (CIE coordinates (x, y) = (0.17, 0.10)) measured at 7 V. The initial positive scan of the D–π–A polysulfone based light emitting electrochemical cell with a sweep rate of 0.1 V s?1 afforded a maximum luminance of 1080 cd m?2 with a current efficiency of 1.96 cd A?1 at an operating voltage of 12.5 V. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 3454–3461 |
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| Keywords: | π ‐conjugation donor‐π ‐acceptor polysulfones fluorene light‐emitting electrochemical cells |
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