The Luminescence Mechanism Of RGB Led

The terminal voltage of the PN junction constitutes a potential barrier. When the forward bias voltage is applied, the potential barrier drops, and most carriers in the P and N regions diffuse to each other. Since the electron mobility is much higher than the hole mobility, a large number of electrons will diffuse to the P region, forming the injection of a few carriers in the P region. These electrons recombine with holes in the valence band, and the energy obtained during recombination is released in the form of light energy. This is the principle of PN junction luminescence.