Patent ID: 6949291

Claim:
An electroluminescent device comprising a substrate, a first electrode supported by the substrate, a second electrode positioned over the first electrode, and a layer including at least one semiconductive polymer between the first and second electrodes, wherein said semiconductive polymer is a copolymer in which one of the repeat units is a group of formula (I) or a homopolymer in which the repeat unit is a group of formula (I): wherein: A and B are the same or different and each comprises wholly or partially an aryl moiety or a heteroaryl moiety, said moiety in A being fused to the bond a-b and said moiety in B being fused to the bond c-d; and X is a linking unit, X being such that there is a torsion angle of at least 5° between the bond a-b and the bond c-d about the bond b-d.