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AssigneeGeorgia Tech Research Corporation
InventorsWounjhang Park, Kazuhito Yasuda, Brent K. Wagner, Christopher J. Summers, Youngrag Do, Hong Guen Yang
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The present invention provides surface coated phosphors useful in field emission displays and vacuum fluorescent displays. The surface coated phosphor comprises a thin coating of rare earth oxide, e.g., yttrium oxide, disposed on an uncoated phosphor such as a sulfide phosphor. The present invention further provides a process for preparing a surface coated phosphor comprising contacting the uncoated phosphor with a rare earth hydroxide gel solution to obtain a rare earth hydroxide gel coated phosphor, drying the gel coated phosphor to remove solvent residues, and heat treating the dried rare earth hydroxide gel coated phosphor. The surface coated phosphors of the present invention have improved cathodoluminescence efficiency, coulombic aging resistance, chemical, and/or oxidative stability.
A surface coated phosphor comprising a thin coating of a rare earth oxide disposed on an uncoated phosphor.
A process for preparing a surface coated phosphor comprising a thin coating of a rare earth oxide disposed on an uncoated phosphor, the process comprising contacting said uncoated phosphor with a rare earth hydroxide gel solution to obtain a rare earth hydroxide gel coated phosphor, drying said rare earth hydroxide gel coated phosphor to obtain a dried rare earth hydroxide gel coated phosphor, and heat treating said dried rare earth hydroxide gel coated phosphor.
A process for preparing a surface coated phosphor comprising a thin coating of rare earth oxide disposed on an uncoated phosphor comprising:
Dependencies are inferred from the claim text.