Patent ID: 7214763

Claim:
A copolymer consisting essentially of at least one first monomeric unit and at least one second monomeric unit, wherein the at least one first monomeric unit has a Formula I and I(a) and the at least one second monomeric unit is selected from fused ring aromatic groups having Formula VI, where: in each of Formulae I, I(a), VI, VII, and VIII: R is a substituent on a carbon atom which can be the same or different at each occurrence and is selected from hydrogen, alkyl, aryl, heteroalkyl, heteroaryl, F, —CN, —OR 1 , —CO 2 R 1 , —C ψ H θ F λ , —OC ψ H θ F λ , —SR 1 , —N(R 1 ) 2 , —P(R 1 ) 2 , —SOR 1 , —SO 2 R 1 , —NO 2 , and beta-dicarbonyls having Formula XII wherein R 2 is selected from hydrogen, alkyl, aryl, heteroalkyl and heteroaryl; δ is 0 or an integer from 1 to 12, adjacent R groups together can form a single 5- or 6-membered cycloalkyl, aryl, or heteroaryl ring, such that: R 1 is a substituent on a heteroatom which can be the same or different at each occurrence and is selected from alkyl, aryl, heteroalkyl and heteroaryl; and ψ is an integer between 1 and 20, and θ and λ and are integers satisfying Equation A1 below: θ+λ=2ψ+1; (Equation A1); in each of Formulae VI, VII, and VIII: E can be the same or different at each occurrence and is a single bond or a linking group selected from arylene and heteroarylene; in Formula VI; the two E's are in the 1,4-, 1,5-, 1,8-, 2,3-, or 2,6- positions; in Formula VII; the two E's are in the 1,4-, 1,5-, 1,8-, 2,3-, 2,6-, or 9,10- positions; in Formula VIII; a first E is in the 1, 2, or 3 position, a second E is in the 6, 7, or 8 position; and with the proviso that when R in formulae VI, VII, and VIII is hydrogen, alkyl, F, —CN, —OR 1 , or CO 2 R 1 the copolymer further comprises end-capping groups that are aromatic; and with the further proviso that said copolymer does not consist of 9,9-di-n-octylfluorene and unsubstituted naphthalene alternating copolymer.