FLUORINATED POLY(P-PHENYLENEVINYLENE) COPOLYMERS - PREPARATION AND USE IN LIGHT-EMITTING-DIODES

A fluorinated poly(p-phenylenevinylene) analogue, co(TFPV-PV), has bee n prepared by copolymerization of fluorinated and nonfluorinated bissu lfonium salt monomers. Conversion and yield decreased as a function of fluorine substitution. The W-vis absorption was strongly shifted to t he blue with increasing fluorine content. Complementary shifts in phot oluminescence spectra were not observed, presumably because the fluori nated segments of the copolymer are very weakly luminescent relative t o nonfluorinated segments. The photoluminescence spectra are therefore similar to those found for poly(p-phenylenevinylene) in the past. The co(TFPV-PV) compounds showed electroluminscence at an ac potential of similar to 10 V (rms, 600 Hz) between ITO and Al electrodes. Maxima w ere shifted slightly to the blue with an increase in fluorine.