This book covers all aspects of organic light-emitting diodes (OLEDs), focusing on the unique characteristics of electroluminescent materials, device structures, and fabrication technologies. It compiles information on the synthesis, properties, and device performance of nearly 1,000 organic small molecule- and polymer-based electroluminescent materials. It also investigates practical manufacturing techniques for OLED fabrication as well as methods used for microstructural characterization, performance measurement, and defect analysis. Later chapters discuss the patent status of the organic light-emitting materials, potential applications, and the academic and industrial challenges.