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Electroluminescent Devices

Electroluminescence is the emission of light by phosphors under the direct action of an electric field. The process of luminescence is the same as the process of excitation of phosphors by ultraviolet radiation or cathode rays.

Most practical electroluminescent lamps and devices are made using "intrinsic" or "Destriau" electroluminescence. Its structure is basically a flat capacitor with a fluorescent material as the medium. One of the electrodes is transparent, allowing light to be emitted from the electrode. The phosphors on the market are all based on zinc sulfide, which can produce yellow, green, or blue light after appropriate excitation. Its emission band is very similar to that of sulfides excited by ultraviolet radiation, but the preparation method is different.

Electroluminescent lamps can be divided into two categories according to the bonding material of the phosphors: organic and ceramic. The two categories can be further subdivided according to the different substrates used. The development of the basic principle and the complexity of the structure also led to the emergence of two different types of image storage devices.

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