It doesn't.
What is Electroluminescence (EL)?
Electroluminescent panels are paper thin laminated panels that illuminate as an electrical current is passed through the panel. This Electroluminescence is created when phosphor crystals with coloured overlays are sandwiched between conductors, and as an electrical current is applied, the phosphor crystals rapidly charge and emit light which illuminates the printed overlay.
EL lamps are produced in many forms such as Electroluminescent panels, EL Tape or EL Wire. The low power consumption makes Electroluminescent technology one of the most energy efficient light sources available.