Optical properties of a soluble conducting polymer, perfluoroalkylated poly(diphenylacetylene) (PFPDPA) were clarified. The band-gap energy was evaluated to be about 2.7 eV. Relatively strong fluorescence was observed in PFPDPA, while poly(diphenylacetylene) (PDPA) is considered to be a conducting polymer with a degenerated ground state in which a soliton is considered to play an important role. A light-emitting diode (LED) with In-Mg/PFPDPA/indium-tin-oxide (ITO) configuration was fabricated and green light emission was observed.

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Fluoroalkyl end-capped copolymers containing glucosyl segments were prepared by the copolymerizations of fluoroalkanoyl peroxides with 2-glucosyoxyethyl methacrylate (GEMA) and comonomers such as acrylic acid (ACA) and methacrylate monomer-containing poly(oxyethylene) units (PME). Under the non-cross-linked conditions, fluoroalkyl end-capped GEMA-ACA and GEMA-PME copolymers were found to cause a gelation in dimethyl sulfoxide (DMSO), where the aggregations of end-capped fluoroalkyl segments and the hydrogen-bonding interaction between hydroxyl segments are involved in establishing a physical gel network, although the corresponding nonfluorinated GEMA copolymers could cause no gelation in DMSO. More interestingly, it was demonstrated that these fluorinated polymeric gelling electrolytes containing lithium salts exhibit a considerably high ionic conductivity of 10 Ϫ3 S/cm level at room temperature.