Process structure and white light source of white light LED
Application foreground of white light LED lighting new light source. In order to explain the characteristics of white light LED, first look at the situation of the lighting source used. The incandescent lamp and halogen tungsten lamp have a luminous efficiency of 12~24 lumens / watt, and the luminous efficiency of fluorescent lamp and HID lamp is 50~120 lumens / watt. The white LED: in 1998, light white LED is only 5 LM / W, in 1999 has reached 15 LM / W, this index is similar to general household incandescent lamps, and in 2000, light efficiency of white LED has reached 25 LM / W, the index and the tungsten halogen lamp is similar. In 2012, white light LED light efficiency has reached 120 lumens / watt, white LED writer lighting source began to popularize. By 2020, the light efficiency of LED is expected to reach 200 lumens / watt.
For general illumination, the white light LED is usually formed in two ways on the process structure. The first is the use of blue light technology to match the phosphor to form white light; the second is a variety of monochromatic light mixing methods. Both of these two methods have been successful in producing white light devices.
Incandescent lamps and halogen lamps for general lighting purposes although cheap, but the low light efficiency (wasted power consumption thermal effect lamp), short service life, maintenance workload, but if using white LED for lighting, not only high light efficiency, and long service life (more than 10000 hours of continuous work), almost no maintenance. The German company Hella LED developed using white light aircraft reading a street lamp; the Australian capital Canberra has used the white LED lighting lamp; city traffic management in China is also white LED to replace the early order of traffic lights. It is foreseeable that in the near future, white light LED will enter the family to replace the existing lighting.LED light source with the use of low-voltage power supply, low energy consumption, strong applicability, high stability, fast response time, no pollution to environment, color light etc., although the price is compared with the existing lighting equipment is expensive, it will inevitably existing lighting devices.
