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US 2003/0198738 A1Published application
Method of coating micrometer sized inorganic particles
AssigneeSarnoff Corporation
InventorYongchi Tian
Life of this patent
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Abstract
A method for coating moisture sensitive inorganic particles, such as phosphors, comprising mixing the inorganic particles having a particle size of about 1 to 100 micrometers with nanometer-sized coating particles, and firing the mixture to soften or melt the nanometer-sized particles about the inorganic particles, forming a moisture impervious coating. The coated particles are washed to remove excess particles, and dried. Coated moisture sensitive phosphor particles are impervious to moisture.
Claims13
A method for coating moisture sensitive inorganic particles comprising
- mixing inorganic particles having a particle size of about 1 to 100 micrometers with sufficient inorganic coating particles having a particle size of about 1 to 300 nanometers to coat the inorganic particles,
- firing the mixture at a temperature high enough to soften or melt the nanometer-sized coating particles but low enough so the surface properties of the micrometer-sized particles remain unchanged,
- removing any un-coated micrometer sized particles by reacting or dissolving them in a solvent, and drying the coated particles.
Dependencies are inferred from the claim text.