Photoluminescent color tuning in fluorene derivative/copolymer composite films based on H-bonds |
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Authors: | Kawatsuki Nobuhiro Miki Hisako Kondo Mizuho Nakamura Mitsunobu |
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Institution: | Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, Hyogo, Japan. kawatuki@eng.u-hyogo.ac.jp |
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Abstract: | Reversible addition-fragmentation chain transfer (RAFT) polymerization is used to synthesize diblock and random copolymers of poly(2-trifluoroethyl methacrylate)-co-(methacrylic acid)]. Copolymer films doped with fluorene derivatives comprised of pyridine groups exhibit reversible photoluminescent (PL) color tuning by adjusting the location of fluorene derivatives in H-bonds or non-H-bonds environments. The composite films exhibit green and blue photoluminescence with and without effective H-bonding between the pyridine ring in the fluorene derivative and the carboxylic acid side group, respectively. At elevated temperatures, the H-bonded structure dissociates and the fluorene derivative migrates to the hydrophobic block in the diblock polymer, and they do not form H-bonds upon cooling. However, re-formation of H-bonds also occurs upon cooling random copolymers. Moreover, adjusting the annealing temperature and the solvent annealing reversibly tunes the PL color in the diblock copolymer composite films. |
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