Electroluminescent film (EL film for short), also called luminous or plasma film, luminous film or capacitor luminous film, is a technical application of electroluminescence for converting electrical energy into light.

Electroluminescence is the property of certain materials or material combinations to emit light when an electric field is applied. In the case of the electroluminescent film, a semiconductor in a special capacitor configuration is excited to glow by an alternating electrical field. The electroluminescent film is a Lambert radiator.