Electroluminescence

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An electroluminescent nightlight in operation (uses 0.08 W at 230 V, and dates from 1960; lit diameter 59 mm)

Electroluminescence (EL) is an optical phenomenon and electrical phenomenon in which a material emits light in response to the passage of an electric current or to a strong electric field. This is distinct from black body light emission resulting from heat (incandescence), from a chemical reaction (chemiluminescence), sound (sonoluminescence), or other mechanical action (mechanoluminescence).

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