Synthesis and optical properties of white phosphorescent carbazole - iridium copolymers |
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| Authors: | Meijuan Lin Dongdong Li Xiaoping Wang Caiping Luo |
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| Institution: | 1. Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University, Fuzhou, Chinamjlin@fjnu.edu.cn qdling@fjnu.edu.cn;3. College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou, China;4. Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University, Fuzhou, China |
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| Abstract: | A series of novel carbazole-iridium copolymers have been designed and synthesized by the combination of blue-emitting acrylate carbazole M1 with hole transporting property and yellow-emitting cyclometalated iridium complex M2 containing 2-phenylpyridine as main ligand and acrylic acid as auxiliary ligand. The results showed that the blue carbazole host resulted in an efficient energy transfer to the yellow iridium complex guest, and when the feed molar ratio of M1 to M2 was 99:1, the emission spectrum of the copolymer presented a broad peak emission which can cover the whole visible range from 400 to 700 nm to obtain a nearly white copolymer material with the CIE coordinates of (0.30, 0.31), as a consequence of polymerized units luminescence, host-guest energy transfer and conjugation degree. Nevertheless, the host-guest energy transfer resulted in green emission about 524 nm of copolymer as the proportion of iridium complex monomer increased. The fluorescence quantum yields of the copolymers were significantly improved compared to the iridium complex monomer. |
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| Keywords: | Carbazole iridium complex white copolymer energy transfer free radical copolymerization |
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