Application of semiconductor junction P • N principle into LED light source made available in the 20th century, early 60s, first appeared in 1964 in red light-emitting diode, followed by a yellow LED. Until 1994, blue, green LED was developed. Japan in 1996 by Nichia Corporation (Nichia) successfully developed a white LED. Its inherent characteristics of LED, such as energy saving, long life, vibration-resistant, fast response, characterized by cold light source is widely used in light, signal light, display, landscape lighting field, and in our daily life can be seen everywhere , household appliances, telephone, dashboard lighting, automotive anti-fog lamps, traffic lights and so on. However, due to its poor brightness, which is very expensive, such as constraints, can not be applied as a general source. In recent years, with the semiconductor light-emitting materials for the deepening of the study, LED manufacturing technology advances and new materials (crystal and nitride phosphors) the development and application of a variety of colors made of ultra-high brightness LED breakthrough progress, and its light-emitting efficiency by approximately 1,000 times, color has been achieved in all colors of visible light, the most important of which is the ultra-high brightness white LED enable applications across the LED light source of highly efficient market. It has been pointed out that the high-brightness LED will be the following human after Edison invented incandescent bulbs, one of the greatest inventions. |
