Phosphor for Optoelectronic Devices: A review

Development of various types of new devices commonly phosphors based as well a semiconductor chip technology and organic light emitting diodes are the need of the day to save the power. The main aims of developing a device are echo friendly, power saver and long life in ambient temperatures and consumer friendly. The electronic display has become a part of day-to-day life of modern world. Without use of a luminous device there is no daily life in modern world. It is considered as an important component of the human-electronic interface. We find displays in various sizes from microns to meters in different applications from mobile phones to net TVs. Displays are broadly divided into emissive and non-emissive displays; both require phosphors to generate visible light. The phosphors employed in displays optimally satisfy the following characteristics required by NTSC/PAL: quantum efficiency, brightness, reflectivity to visible light, longevity, persistence, color coordinate and color temperature. Phosphors play an important role in designing and performance of a typical display for particular application. Description of individual properties can be found in any solid state physics books and journals. The display phosphor requirements including, physical, optical and electrical, preparation of phosphors by various methods, effect of preparative conditions, and characterization are described. Operation of various emissive and non emissive displays and the role of number of industrial phosphors are discussed.