A method is provided for forming in a semiconductive conjugated polymer at least first and second legions having different optical properties. The method comprises: forming a layer of a precursor polymer and permitting the first region to come into contact with a reactant, such as an acid, and heat while...http://www.google.de/patents/US5425125?utm_source=gb-gplus-sharePatent US5425125 - Optical device incorporating semiconductive conjugated polymer
