What are the light emitting mechanisms and working principles of LEDs?

 

 

Light-emitting diodes are made of III-IV compounds such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (phosphorous gallium arsenide) and other semiconductors, the core of which is a PN junction. Therefore, it has a general PN junction. The IN characteristics, namely forward conduction, reverse blocking, breakdown characteristics. In addition, under certain conditions, it also has light-emitting characteristics. At the forward voltage, electrons are injected into the P region from the N region, and holes are injected from the P region into the N region. Some of the minority carriers (low births) entering the opponent's area recombine with the majority carriers (multiple sons) and emit light.