LED the characteristics of luminescent materials

HP company in 1968 to produce LED emitting red light (wavelength 660nm), and then start to appear and can be used to display yellow, and green (wavelength 570nm), blue (wavelength 470nm) and pure green (wavelength 525nm), but due to the high brightness of blue and pure green semiconductor wafer manufacturing technology mainly lies in Japan, the United States and a few other companies in the hands, resulting in prices higher. LED light-emitting materials used in the screen have the following forms:

1,LED emitting light (or a single lamp)

Usually by a single LED chip, reflective bowl, metal anode, metal cathode composition, outsourcing has a translucent shell condenser capacity of epoxy resin. Can be one or more (different colors) Single-light constitute a basic pixel, due to high brightness, multi-use outdoor display. 

2, LED Dot Matrix Module

Posed by a number of chip light-emitting matrix, encapsulated in plastic case with epoxy resin inside. For the ranks of scan driver, easy to constitute a high-density displays, used for indoor display.

3,SMD-type LED light-emitting light (or SMDLED)

Is the LED light lights solder paste form of packaging that can be used indoor full color display, enabling a single point of maintenance, effectively overcome the phenomenon of mosaic.,

2009-9-23