Electroluminescent phosphor with plural moisture resistant coatings thereon
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United States of America Patent
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Feb 21, 2006
Grant Date -
Oct 17, 2002
app pub date -
Apr 3, 2002
filing date -
Apr 6, 2001
priority date (Note) -
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Abstract
A moisture-resistant electroluminescent phosphor is provided wherein the individual phosphor particles have a first coating of an inorganic moisture-resistant coating and a second coating of an organic moisture-resistant coating. The process for making the moisture-resistant phosphor comprises applying a first layer of an inorganic moisture-resistant coating to individual particles of an electroluminescent phosphor to form a first-coated phosphor, substantially isolating said first-coated phosphor from contact with atmospheric oxygen and moisture, and applying a second layer of an organic moisture-resistant coating to the first-coated phosphor to form a second-coated phosphor.
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