The monograph is dedicated to theoretical and experimental studies of the optical and electrical properties of such functional materials for OLED technologies as: ITO, advanced graphene oxide, ZnO, Alq3, dicyanomethylenepyrane and other hіdni.For scientific and engineering professionals who specialize in the field of electronic materials science, nano-, microelectronics and solid state physics, as well as for graduates, graduate students and students in various physical, technical and natural sciences specialties.