Patent ID: 7700366

Claim:
A fluorescent, semiconductive polymer comprising a conjugated backbone and electron withdrawing groups bonded to the polymer, wherein the fluorescent, semiconductive polymer is represented by formula Ia, Ib, Ic or Id: wherein, independently for each occurrence: R is an electron withdrawing group selected from the group consisting of esters, perhalogenated alkyls, perhalogenated aryls, nitriles, and electron deficient heteroaryls; B is a double bond, triple bond, or aryl; optionally substituted by one or more R 1 ; R 1 is R, H, C 1-12 alkyl, C 2-12 alkenyl, C 2-12 alkynyl, aryl, aralkyl, heteroaryl, or heteroaralkyl; A is a fused aryl, cycloalkyl, or cycloalkenyl ring; * depicts an end group for the polymer selected from the group consisting of H, halide, alkyl, alkoxy, and aryl; and n is an integer greater than 1.