第三书包h文辣文吃奶,成人 www在线观看,国产露脸150部国语对白,国产婬妇毛多水多亚洲AV无码

The light of LEDs is generated by the recombination of electrons and holes

When a forward voltage is applied to both ends of the LED, and current flows from the LED anode to the cathode, the minority and majority carriers in the semiconductor recombine, releasing excess energy and causing photon emission. The semiconductor emits light of different colors from ultraviolet to infrared.