RFID Fast PCB assembly

How do PCB circuit boards work?

The Aluminum base  board core part of the light-emitting diode is a wafer composed of p-type semiconductor and n-type semiconductor. There is a transition layer between p-type semiconductor and n-type semiconductor, which is called p-n junction. In the PN junction of certain semiconductor materials, when the injected minority carriers and the majority carriers recombine, the excess energy is released in the form of light, thereby directly converting electrical energy into light energy. With reverse voltage applied to the PN junction, it is difficult to inject minority carriers, so it does not emit light. This kind of diode Surface-Mount (SMT) &BGA Assembly board made by injection electroluminescence principle is called light-emitting diode, commonly known as LED. When it is in a forward working state (that is, a positive voltage is applied to both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared. The intensity of the light Turkey PCB Assembly board is related to the current.