Electroluminescent lamp and method
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United States of America Patent
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Feb 13, 1996
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N/A
app pub date -
Aug 3, 1993
filing date -
Aug 3, 1993
priority date (Note) -
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Abstract
A flexible, thick film, electroluminescent lamp and method of construction in which a single non-hygroscopic binder is used for all layers (with the optional exception of the rear electrode), thereby reducing delamination as a result of temperature changes and the susceptibility to moisture. The binder includes a fluoropolymer resin, namely polyvinylidene fluoride, which has ultraviolet radiation absorbing characteristics. The use of a common binder for both phosphor and adjacent dielectric layers reduces lamp failure due to localized heating, thus increasing light output for a given voltage and excitation frequency, and increasing the ability of the lamp to withstand overvoltage conditions without failure. The lamps may be made by screen printing, by spraying, by roller coating or vacuum deposition, although screen printing is preferred. By the multilayer process, unique control of the illumination is achieved.
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