Efficient π‐conjugated interrupted host polymer by metal‐free polymerization for blue/green phosphorescent light‐emitting diodes |
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| Authors: | Bing Chen Lei Yu BiaoLan Liu JiWen Feng ZhiTian Liu Lei Ying YanHu Li Wei Yang |
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| Institution: | 1. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, , Guangzhou, 510640 China;2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, , Wuhan, 430071 China;3. School of Material Science and Engineering, Wuhan Institute of Technology, , Wuhan, 430073 China |
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| Abstract: | A new aromatic host polymer poly{1,4‐bis(9‐decylcarbazole‐3‐yl)‐2,3,5,6‐tetrafluorobenzene‐3,3′‐diyl]‐alt‐N‐methylisatin‐2‐one‐3,3‐diyl]} (PICzFB) containing carbazole–tetrafluorinebeneze–carbazole moiety in the π‐conjugated interrupted polymer backbone was synthesized by superacid‐catalyzed metal‐free polyhydroxyalkylation. The resulted copolymer PICzFB showed a comparatively wide band gap up to 3.32 eV and high triplet energy (ET) of 2.73 eV due to confined conjugation by the δ? C bond interrupted polymer backbone. Blue and green light‐emitting devices with PICzFB as host, FIrpic and Ir(mppy)3 as phosphorescent dopants showed the maximum luminous efficiencies of 5.0 and 27.6 cd/A, respectively. The results suggested that the strategy of incorporating bipolar unit into the π‐conjugated interrupted polymer backbone can be a promising approach to obtain host polymer with high triplet level for solution‐processed blue and green phosphorescent polymer light‐emitting diodes. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 1037–1046 |
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| Keywords: | phosphorescent host polymer polycondensation polymer light‐emitting diode (PLED) super acid‐catalyzed polyhydroxyalkylation |
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