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Keywords:

  • aggregation;
  • conjugated polymers;
  • fluorene;
  • luminescence;
  • Suzuki coupling

Abstract

Summary: New conjugated copolymers containing 9,9-dioctylfluorene and terephthalate units (as dimethyl ester or free acid) were synthesized by the Suzuki coupling and characterized by GPC and NMR, FT-IR and UV-VIS spectroscopies. These copolymers proved to be good luminescent materials showing emissions in the blue region of the visible spectrum both in solution (λem = 450 nm) and in thin layers. Differences in the luminescence properties were attributed to various extents of aggregation. It was shown that interchain interaction can be avoided by the formation of the copolymer sodium salt. The copolymers were tested as active layers in light-emitting devices and the formation of their Eu(III) complexes was studied.