Method of manufacturing phosphor translucent ceramics and light emitting devices
AssigneeNitto Denko Corporation
InventorsHiroaki Miyagawa, Toshitaka Nakamura, Hironaka Fujii, Amane Mochizuki
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Abstract
Disclosed herein is a method of increasing the luminescence efficiency of a translucent phosphor ceramic. Other embodiments are methods of manufacturing a phosphor translucent ceramic having increased luminescence. Another embodiment is a light emitting device comprising a phosphor translucent ceramic made by one of these methods.
Claims20
A method of increasing the luminescence efficiency of a translucent phosphor ceramic, comprising:
- heating the translucent phosphor ceramic under a reducing atmosphere for a period of from about 3 to about 7 hours at a temperature of from about 1200° C. to about 1600° C., thereby increasing the luminescence efficiency;
- and
- wherein the temperature is lower than the melting point of the translucent phosphor ceramic.
A method of increasing the luminescence efficiency of a translucent phosphor ceramic, comprising:
- heating the translucent phosphor ceramic under a reducing atmosphere at a temperature of at least about 1200° C. thereby increasing the luminescence efficiency;
- and
- wherein the reducing atmosphere comprises a mixture of from about 1% (v/v) to about 10% (v/v) hydrogen gas and about 90% (v/v) to about 99% (v/v) nitrogen gas.
A method of increasing the luminescence efficiency of a translucent phosphor ceramic, comprising:
- heating the translucent phosphor ceramic under a reducing atmosphere at a temperature of at least about 1200° C. thereby increasing the luminescence efficiency;
- and
- wherein the translucent phosphor ceramic is prepared by a process comprising heating at least part of a plurality of particles at a temperature of from about 1450° C. to about 2000° C. under a vacuum.
A method of increasing the luminescence efficiency of a translucent phosphor ceramic, comprising:
- heating the translucent phosphor ceramic at a temperature of at least about 1200° C. under a reducing atmosphere thereby increasing the luminescence efficiency;
- and
- wherein said translucent phosphor ceramic comprises a rare earth doped phosphor material having garnet structure.
A method of manufacturing a phosphor translucent ceramic having increased luminescence comprising:
- providing a precursor composition;
- and
- heating the precursor composition under both a reducing atmosphere and under vacuum.
Dependencies are inferred from the claim text.