Nitride semiconductors have tremendous potential, particularly in visible and ultraviolent optoelectronics. This book describes the physics of nitride-based materials and related devices. Its goal is to provide graduate students and young researchers with a rapid introduction to this burgeoning field. It contains tutorial-style chapters commissioned from some of the very best experts from academia and industry. The book addresses all aspects arising from the dual challenges of achieving high-quality, single crystal material and engineering optoelectronic devices. In the first chapters, the reader will learn about the nitrides in the context of other semiconductors and will be exposed to the methods used to grow these materials. The following chapters then discuss the materials' performance from the point of view of electronic transport, optical, and structural properties. The volume concludes with an extensive review of device applications in modern transistors, ultravioletdetectors, and light emitters.