| abstract |
The invention relates to novel layers comprising polyimide and organic functionalnmaterial such as hole transport material, electron transport materialnand/or emitter material having a glass transition temperature of higher thann80°C. The layers can be prepared by mixing the functional material with anpolyimide precursor material, forming a thin film out of the mixture and convertingnsaid mixture into doped polyimide. Said doped polyimide layers can benused for the manufacture of electronic and optoelectronic devices such as e.g.nlight emitting devices. Due to the content of functional material, they can actnas hole transport, electron transport or emitter layer. Moreover, the layers cannbe processed to have aligning properties for liquid crystals, thus allowing thenmanufacture of devices emitting polarized light. Furthermore, after conversionnto doped polyimide, the layers are resistant to solvent treatment allowing thenpreparation of multilayers by successive coating and conversion cycles. |