Patent ID: 7462726

Claim:
A π-conjugated compound represented by General Formula (VI) below: where R 1 and R 2 are respectively hydrogen or a linear, cyclic, or branched alkyl group of 1 to 20 carbon atoms, at least one of R 1 and R 2 being not hydrogen, and one or more of CH 2 of the alkyl group optionally replaced by O, CO, S, or NH; R 3 and R 4 are respectively hydrogen or a linear, cyclic, or branched perfluoroalkyl group of 1 to 20 carbon atoms, at least one of R 3 and R 4 being not hydrogen, and one or more CF 2 of the perfluoroalkyl group optionally replaced by CH 2 , O, CO, S, or NH; A 1 and A 3 each represents a single bond, A 2 and A 4 each represents a thiophene ring; one or more of CH groups in the ring optionally have a substituent; r is an integer of 1 to 10; X, Z, and L are respectively an integer of 0 to 20 provided that the sum X+Z+L is an odd number; Y is an even number of not more than 20; P is an odd number not more than 19; and m is an integer of 2 to 500.