(EL) is an optical phenomenon and electrical phenomenon where a material emits light in response to an electric current passed through it, or to a strong electric field. This is distinct to light emission resulting from heat (incandescence) or from the action of chemicals (chemoluminescence).

The light produced by some materials — mainly semiconductors — when exposed to an electric field. In this process, the electric field excites electrons in the material, which then emit the excess energy in the form of photons. Light-emitting diodes (LEDs) are the most well known example of EL.

The emmision of light from a phosphor excited by an electromagnetic field. An example: a light source technology used in exit signs that provides uniform brightness, long lamp life (approximately eight years), while consuming very little energy (less than one watt per lamp). The emmision of light from a phosphor excited by an electromagnetic field.

conversion of electric energy directly into visible light.

Conversion of electrical energy into light energy.