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In the 1950s, RCA first found the infrared radiation of gallium arsenide in other semiconductor alloys. LED is a luminescence component made of semiconductor materials. The component has two electrode terminals.
Voltage is applied between the terminals and electricity is switched on. And after the combination of electricity and hole, the remaining power is released in form of light. Different materials have different wavelengths and thus send out lights of various colors. This is the basic lighting theory of LED. LED can only be applied in diodes that can send out visible light. The diodes that send out near-infrared radiation are called IRED. The diodes that can send out some ultraviolet radiation are called UVLED, and …