Patent ID: 8779204

Claim:
A fluorene copolymer containing thienopyrazine unit, which comprises copolymer represented by following formula (I): wherein R 1 , R 2 , R 5 , R 6 , R 7 , R 8 are selected from H, C 1 -C 20 alkyl; R 3 , R 4 are selected from H, C 1-C 20 alkyl, C 1 -C 20 alkoxyl, phenyl or phenoxyl; x+y =1, x≠0, y≠0; n is an integer of 2 to 200, Ar 1 is thiophene unit-containing group, wherein said R 1 and R 2 are same alkyl, R 3 and R 4 are same alkyl, R 5 and R 6 are same alkyl, R 7 and R 8 are same alkyl.