The fact that organic semiconductors exhibit unique electronic and optical properties has been known for over half a century; however is only within the past 10 years, with the discovery of stable materials, that these prperties have attracted industrial interest. the low cost, flexible displays that can be constructed using OLEDs Organic Light Emitting Devices have led many to predict that this technology will replace the liquid crystal display [LCD] as the industry standard. This textbook is the first to cover the science and technology of organic semiconductors, from their fundamental chemistry, through their electronic prperties, characterization methods, and applications.