The light-emitting principle of light-emitting diodes is more complicated than other flashlight light-emitting principles. It belongs to the direct combination of injected electrons and valence band holes to emit light. There is also a situation where the injected electrons are first replenished by the light-emitting center. , And then recombine with holes to emit light. In addition to this composite luminescence, the luminescence principle of the led flashlight is also inseparable from other released energy. In the flashlight, the greater the proportion of the non-luminescence composite quantity, the higher the efficiency of the light quantum is corresponding.