What's the meaning of LED?
What's the meaning of LED? LED (Light Emitting Diode), light emitting diode. It is used as light emitting materials by solid semiconductor chip, semiconductor carrier occurs through release of excess energy complex caused by photon emission, which issued a red, orange, yellow, green, cyan, blue, purple and white light. Lighting products and LED application products is the use of LED as a light source created by the.
The composition and working principle of a, LED:
The core part of the light emitting diode chip is composed of P type semiconductorand N type semiconductor. In the P type semiconductor and N type semiconductorhas a transition layer, called p-n. In some semiconductor materials of PN junction, the injection of minority carrier carrier and the majority of the extra time will be the form of light energy to release, thus the power to direct conversion of solar energy. PN junction reverse voltage, a few hard carrier injection, it is not luminous. The use of injection electroluminescent diodes is produced by the principle of light emitting diode, LED. When it in a positive state of the work (which ends with forward voltage),the current flows from the LED anode, cathode, semiconductor crystals on the issue from the ultraviolet to infrared light of different colors, light and the strength of thecurrent.
Advantages of two, LED light source is the main
1: LED low voltage power supply voltage from 3V to 24V, so it is safer than the use ofhigh voltage power supply, especially suitable for public places.
2 high efficiency: incandescent energy consumption than the same light effect is a decrease of about 80%.
The less environmental pollution 3: no harmful metal mercury
4, LED long life: the luminescence mechanism of incandescent lamp is electricity willlight-emitting tungsten filament is heated and luminous, after heating for a long time,tungsten will aging or burn, so far, the incandescent light bulb life has ended. The light-emitting diode light-emitting process includes three parts: under the forward bias carrier injection, composite radiation and light transmission. This diode is mainly rely on moving carrier and light, there is no aging and burning phenomenon, its specialluminescent mechanism determines the lifetime of it up to 5-10 million hours.