Light Emitting Diodes

Abstract Inorganic semiconductor light‐emitting diodes (LEDs) are environmentally benign and have already found widespread use as indicator lights, large‐area displays, and signage applications. In addition, LEDs are very promising candidates for future energy‐saving light sources suitable for office and home lighting applications. Today, the entire visible spectrum can be covered by light‐emitting semiconductors: AlGaInP and AlGaInN compound semiconductors are capable of emission in the red to yellow wavelength range and ultraviolet (uv) to green wavelength range, respectively. Currently, two basic approaches exist for white light sources: The combination of one or more phosphorescent materials with a…