what led

An LED, or Light Emitting Diode, is a semiconductor device that emits light when an electric current passes through it. This is achieved through the recombination of holes from p-type semiconductors with electrons from n-type semiconductors, which produces light. The color of the light emitted depends on the bandgap of the semiconductor material, with different semiconductor materials producing different colors of light. LEDs are described as solid- state devices, and they are used in various applications, such as indicator lamps, automotive lights, alphanumeric displays, and full-color posters