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Organic Electroluminescent Light

The structure using organic dielectric materials is to use organic resin to stick phosphor and reflective powder on a glass plate coated with a transparent tin oxide conductive film. The conductive surface is first coated with a layer of phosphor, and then a layer of barium titanate to scatter light forward and increase the entire dielectric constant, so that the lamp can withstand greater power. Finally, a layer of evaporated metal or conductive paint is added to the back to form an electrode layer. This kind of lamp with organic matter coated on glass requires tight sealing to prevent moisture intrusion, otherwise it will cause dielectric breakdown, so the back is usually coated with paraffin and aluminum foil or other material layers.

In an electroluminescent lamp, light is emitted only where the phosphor is subjected to the alternating electric field between the two poles. If the shape of the back electrode is appropriate, when the power is turned on, the board surface can show the illuminated image, but when the power is turned off, the image disappears. Organic electroluminescent lamps are particularly suitable for this application, in contrast to "metal-ceramic" electroluminescent lamps, where the transparent electrodes of the ceramic luminescent plate must be shaped so that the image is still partially visible when the lamp is turned off, but this increases the difficulty of connecting to the insulating surface of the upper electrode front side.

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