- Dec 07, 2018 -
Light-emitting diode bulbs are essentially different from traditional incandescent lamps, both in structure and in the principle of luminescence. Diodes are commonly used components in electronic circuits, which are made of semiconductor pn knots, plus electrode leads and shells. The diode has a PN knot of two electrodes, so it is called a diode. Diodes have unidirectional conductivity.
There are many kinds of diodes, common detection tubes, rectifier tubes, voltage regulators, switch tubes, damping diodes, luminescent tubes, photoelectric tubes and so on. Light-emitting diodes are usually made from semiconductor materials such as gallium arsenide and gallium phosphate, which glow when passed through forward currents, and the color of the glow depends on the material used to emit red, yellow, green and infrared light. Light-emitting diodes are generally packaged in transparent plastic, with pins long as positive poles and short negative poles for pins. Some light-emitting diodes have three ejection feet, which emit two colors of light according to the voltage of the pins.