Hiroyoshi Naito, Professor in the Department of Physics and Electronics at Osaka Prefecture University, Japan, where he has taught for over 30 years. He has authored and co-authored more than 300 journal publications, contributed several book chapters, and has attended numerous conferences as an invited speaker. His research is focused on the characterization of optical and electronic properties of organic semiconductors and the device physics of organic optoelectronic devices.Series EditorsArthur Willoughby University of Southampton, Southampton, UK.Peter Capper Ex]Leonardo MW Ltd, Southampton, UK.Safa Kasap University of Saskatchewan, Saskatoon, Canada.