Patent ID: 7898163

Claim:
A polymer for use in an optical device comprising one or more regions, where the region comprises: (i) a first structural unit having general formula I: where m=1 or 2 and which contains at least one substituent, the substituent: (a) positioned such that when the first structural unit is provided as a monomeric unit with reactive end groups, there are no substituent groups in the vicinity of the reactive end groups, (b) selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, heteroaryl and heteroaryloxy groups, each of which may be further substituted, and (c) causing the first structural unit to twist out of the plane of the polymer backbone such that the conjugation of the polymer is decreased relative to a polymer not having a twist; and (ii) a second structural unit Ar selected from the group consisting of heteroaryl, triarylamine and 2,7-fluorenyl; such that the region comprises a unit having general formula II: wherein the substituent has a molecular weight of less than 300.