Patent ID: 7740942

Claim:
An opto-electronic device comprising at least one organic electroluminescent layer and a layer comprising at least one sulfonated aromatic condensation copolymer sandwiched between a pair of electrodes, wherein the at least one sulfonated aromatic condensation copolymer comprises a sulfonated polyarylether block copolymer comprising at least one sulfonated polyaryletherketone block having structural units of formula I wherein R 1 and R 2 are independently C 1 -C 10 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, allyl, alkenyl, alkoxy, halo, or cyano; Z 1 is a direct bond, O, S, CH 2 , SO, SO 2 , CO, phosphinyl oxide, alkenyl, alkynyl, a C 1 -C 12 aliphatic radical, a C 3 -C 12 cycloaliphatic radical, a C 3 -C 12 aromatic radical or a combination thereof; M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof; a is 0 or an integer from 1 to 3; b is 0 or an integer from 1 to 4; m is 0 or 1.