LED is a solid lighting source, compared with incandescent lamp, it belongs to cold light source.

LED emits light because the remaining energy in the diode PN junction is released as photons when a human electron reacts with a hole.

The color of luminescence depends on the material used to make LED, which is dominated by a V group of compounds. Although I-V compounds can also emit light, their properties are unstable and their applications are less. Judging from the band gap of semiconductor material, the wavelength range of luminescence of the LED material used can range from ultraviolet light to red light.

The appearance of LED can be traced back to the discovery of electroluminescence in Round H J of Marconi laboratory in 1907 using silicon carbide crystal material, but it was not until 1962 that the world's first red LED made by GE's Jr. N Holonvak had only practical application value.

When the material used in LED is CaAsP, the luminescence efficiency is only 0.11m/ W, but it is the prelude to the rapid development of LED.

In 1968, the development of LED has made great progress.The researchers have developed LEDs, which can glow red, orange and yellow, and their luminous efficiency can reach 1 Lm/W.

Mg-doped P-type GaN chips were used by Pankove and Maruska in 1972 to fabricate ultraviolet LED. In the 1980s, the luminous intensity of LEDs surpassed that of liquid crystals, opening up the application of high-brightness LED.

Since the birth of the red LED, the luminous intensity of the red LED has been increased a thousand times, and the wavelength from ultraviolet to all visible light ranges. The luminescence efficiency of blue and green LEDs prepared by GaN in 1992 exceeded 10, which broke through the bottleneck of low luminescence efficiency of blue and green LED. The continuous innovation of red, green and blue LED technology has laid the foundation for LED to become the three primary color red, Green, blue, RGB luminescent lighting system.

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RED LED : MLERED-A1-0000-000V01