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　　LED lighting principle

　　The LED lighting LED is made of semi-conductive systems such as III-IV ethnic compounds, such as GaaS (gallium arsenida), GAP (phosphorus), and GaASP (phosphorus arsenide), and its core is PN knots. Therefore, it has the general P-N characteristic I-N characteristics, that is, positive direction, reverse cut-off, and breakdown characteristics. In addition, under certain conditions, it also has the characteristics of light. Under the forward voltage, the electrons are injected into the P area from the N area, and the acupoint is injected into the N area from the P area. A small number of carrier (young children) entering the opponent's area compounds and glows with most carrier (multi -child). Assuming that the light emitting occurs in the P area, then the injected electrons and priced acupoints are directly compounded and glowed, or they are captured by the emitting center before glowing with the cave. In addition to this glowing and compound, some electronics are captured by non -glow centers (the center is located near the middle of the guide zone, near the middle of the medium), and then compounds with the cave. The energy released each time is not large, and visible light cannot be formed. The greater the composite amount of luminous composite compared to non -light complexity, the higher the efficiency of optical quantum. Since the composite is glowing in the appliance of the decoction, the light is only within the number of μm near the PN noodle surface.

　　Theory and practice have proved that the peak wavelength of light is related to the width of the semiconductor material in the emitting area, that is, λ≈1240/EG (MM)

　　The unit of EG in the formula is electronic volt (EV). If it can produce visible light (the wavelength is 380nm purple light to 780nm red light), the EG of semiconductor materials should be between 3.26 and 1.63EV. The long light than the red light is infrared. There are now infrared, red, yellow, green, and blue light glowing diodes, but the cost and price of the blue light diodes are very high, and it is not common.

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