A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.

How does an LED work simple explanation?

An LED bulb produces light by passing the electric current through a semiconducting material—the diode—which then emits photons (light) through the principle of electroluminescence. Don't let that big word scare you! ... The electrical resistance of the filament causes it to get so hot that it glows, producing light.

How does a LED produce light?

LEDs at their basic level are a lattice work of Si (silicon). ... A diode, as in LED (Light emitting Diode), is a combination of different materials that does this and as a result light is emitted. As electricity passes through these materials the electrons in the compound become excited and emit photons of light.