LED is the abbreviation of light emitting diode

Update:25 May 2019
Summary:

LED is the abbreviation of light emitting diode. Light- […]

LED is the abbreviation of light emitting diode. Light-emitting diode (LED) is a kind of solid-state semiconductor device which can convert electric energy into visible light. It can directly convert electricity into light.

The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket, one end is negative, the other end is connected to the positive pole of the power supply, so that the whole wafer is encapsulated by epoxy resin. Semiconductor wafers consist of two parts, one is P-type semiconductor, in which holes dominate, and the other is N-type semiconductor, where electrons dominate. But when the two semiconductors are connected, a P-N junction is formed between them. When the current acts on the chip through the wire, the electrons are pushed to the P region, where the electrons recombine with the holes and then emit energy in the form of photons, which is the principle of LED luminescence.
Because of the low calorific value of the LED lamp, the electric energy is transformed into light energy as much as possible, so the LED and other energy-saving lamps are often called "LED energy-saving lamps". When purchasing energy-saving lamps, it is important to distinguish between LED and CFL, which are completely different light sources. Also known as energy-saving lamp, compared with CFL lamp, LED lamp environmental protection does not contain mercury, can be recycled, which is probably a major driving force for countries to vigorously develop LED lamp. LED lamps have many advantages, mainly the following points:
Green environmental protection: small glare, no radiation, no harmful substances in use.
(2) Long life, stable performance, no shortcomings such as burnable filament, thermal deposition, light decay, etc.
(3) Multi-change: LED light source can use the principle of red, green and blue to produce different color, intensity and color temperature under the control of computer technology.

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