Led light is the English light emitting diode (light-emitting diode) abbreviation, its basic structure is an electroluminescent semiconductor material chip, with silver or white plastic curing to the bracket, and then use a silver wire or gold wire to connect the chip and circuit board , And then surrounded by epoxy resin seal, play a role in protecting the internal core, and finally install the shell, so the LED lamp seismic performance. Application areas related to mobile phones, desk lamps, home appliances and other household appliances and machinery production.
The 20th century, 60 years, led lighting science and technology workers using semiconductor PN junction light principle, developed into LED light-emitting diodes. At that time the development of the LED, the material used is GaASP, its light color is red. After nearly 30 years of development, we are very familiar with the LED, has been able to issue red, orange, yellow, green, blue and other shade. However, the need for white light LED lighting only after 2000 to develop, here to introduce the white light LED lighting.
The earliest application of semiconductor P-N junction light principle made of LED light source came out in the early 20th century, 60 years. At that time the material used was GaAsP, red light (λp = 650nm), the drive current of 20 mA, the luminous flux of only a few thousand lumens, the corresponding light performance of about 0.1 lumens / watt.