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LED light-emitting principle

Time:2013-08-26 14:52From:未知 Writer:admin Click:times

Light-emitting diode chip by the PN junction, the electrode and optical system. Its luminous body - the area of the chip 10.12mil (1mil = 0.0254 square mm), the current major international chip LED, the chip area of 40mil.

Its light-emitting process includes three parts: under the forward bias carrier injection, radiation and energy transfer complex. Tiny semiconductor chip is packaged in clean resin material, when the electronic after the chip, the negatively charged electron to move to the positively charged region of the hole and with the compound, the disappearance of electrons and holes at the same time have a photon . Between the electron and hole energy (band gap) the greater the energy generated by the higher photon. Photon energy in turn corresponds with the color of light, visible light range of the spectrum, blue light, purple light energy to carry the largest, orange light, red light energy to carry at least. Because different materials have different band gap, which can be different colors of light.

LED lighting will be the mainstream of high-brightness white LED. At present, the commercialization of white LED are second wavelength, that is, Blu-ray single-chip mixed with YAG phosphors produce white light yellow. Was optimistic about the future than the three-wavelength white-light LED, that is inorganic UV chip plus red, blue and green produce white light mixed color phosphors, which will replace the fluorescent lamps, compact fluorescent light bulbs and energy-saving LED backlight and other markets.

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