Moisture-resistant phosphor and associated method
AssigneeGeneral Electric Company
InventorsAnant Achyut Setlur, Oltea Puica Siclovan, Robert Joseph Lyons, Ljudmil Slavchev Grigorov
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Abstract
A phosphor material contains encapsulated particles of manganese (Mn4+) doped fluoride phosphor. A method of encapsulating such particles is also provided. Each particle is encapsulated with a layer of a manganese-free fluoride phosphor. The use of such a phosphor material in a lighting apparatus results in improved stability and acceptable lumen maintenance over the course of the apparatus life.
Claims24
A phosphor material comprising individual particles of manganese (Mn4+) doped fluoride phosphor, wherein each particle is encapsulated with a layer of a manganese-free fluoride phosphor.
A lighting apparatus, comprising:
- a light source;
- and
- a phosphor material radiationally coupled to the light source, and comprising individual particles of Mn4+ (manganese) doped fluoride phosphor, wherein each particle is encapsulated with a manganese-free layer of the fluoride phosphor.
A method of encapsulating manganese-doped fluoride phosphor particles, comprising:
- (a) preparing a saturated solution of a manganese-free fluoride phosphor;
- (b) mixing the saturated solution with manganese-doped fluoride phosphor powder in a vessel to form a suspension;
- (c) evaporating the suspension until a paste is formed;
- and
- (d) drying the paste so as to produce a powder comprising encapsulated particles.
Dependencies are inferred from the claim text.