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LED or Light Emitting Diode, is a type of semiconductor diode that converts electrical energy into light energy, which is widely used in many device, like the optocoupler of solid state relay. Like ordinary diodes, LED consist of a PN junction with unidirectional conductivity. When a forward voltage is applied to the LED, spontaneous emission of fluorescence is produced, and the energy (brightness or wavelength) of the fluorescence is related to the energy concentrated by the LED.