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Electroluminescence

27.05.2015

With the help of zinc sulfide, flexible shiny sheets can be made.

Most luminaires are rigid: glass lamps or solid-state LEDs. Unless the latter can be enclosed in a flexible shell and get a luminous cord. A truly flexible glowing sheet can be made from OLEDs, but they are expensive and short-lived.

Physicists from the Institute of the Leibniz Society for New Materials, led by Peter William de Olivera, decided to use another phenomenon - electroluminescence, that is, the glow of a substance under the influence of an electric field. They enclosed a layer of zinc sulfide particles between two electrodes, one of which was transparent. When applied to a conventional AC voltage of 220 volts, these sheets glow green or blue-green.

All three layers and the control circuit can be easily printed, and the process requires heating to only two hundred degrees, that is, some kind of flexible polymer can serve as a substrate. This significantly reduces the cost of the process and allows you to create previously unseen free-form lamps.

De Olivera is currently working on achieving a white glow, as well as lowering the operating voltage of the luminous sheet.

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