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Answer:
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. ... The first visible-light LEDs were of low intensity and limited to red.
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! ... In contrast, an incandescent light bulb works by passing electricity through a small wire, or filament.
As electrons pass through one crystal to the other they fill electron holes. They emit photons (light). This is also how the semiconductor laser works.