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LED structure and luminous principle
Apr 24, 2017

LED (Light Emitting Diode), light-emitting diodes, is a solid-state semiconductor device that 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, a cathode and the other end connected to the power supply, so that the entire wafer is encapsulated by epoxy resin. Semiconductor wafer is composed of two parts, part P-type semiconductor, in it the hole occupies dominant position, the other end is N-type semiconductor, on this side is mainly electron. But when the two semiconductors are connected, they form a P-n junction. When the current passes through the wire, the electron is pushed to the P area, the electron and the cavity are compounded in the P area, and the energy is emitted in the form of photons, which is the principle of LED luminescence. The wavelength of light is the color of light, which is determined by the material forming P-n junction.

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