Gallium nitride (GaN) is a III/V direct bandgap semiconductor used in lighting and display, as well as data storage, air and water purification, medical treatment, missile warning systems, power amplifiers, and switches. This book addresses material growth, device fabrication, device application, and commercialization of energy-efficient white light-emitting diodes (LEDs), laser diodes, and power electronics devices. It begins with an overview on basics of semiconductor materials, physics, growth and characterization techniques, followed by detailed discussion of advantages, drawbacks,...