LED, light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light. It can directly convert electricity into light. The other end is connected to the power supply subdivision, so that the entire chip is encapsulated by epoxy resin.
The semiconductor chip is composed of two parts, one is a P-type semiconductor, which is projected to the placement position in the inside, and the other is an N-type semiconductor, which is mainly electrons. Form a PN junction. When a current is applied to the chip through a wire, the electrons will be pushed to the P region, where the electrons recombine with the above, and then they will emit energy in the form of photons. This is the principle of the LED light. The wavelength of light, which is the color of light, is determined by the material that forms the PN junction.