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US 9,540,563 B2Granted
Coated phosphor and method for producing coated phosphor
AssigneeDexerials Corporation
InventorsMasahide Daimon, Takehiro Yamasuge, Tsuneo Kusunoki
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Abstract
A coated phosphor includes a sulfide phosphor coated with silicon dioxide film. The silicon dioxide film includes a metal oxide powder. The metal oxide powder includes a zinc oxide powder such that less than 20 parts by mass of the zinc oxide powder relative to 100 parts by mass of the sulfide phosphor is blended therein.
Claims11
A coated phosphor, comprising:
- a sulfide phosphor coated with silicon dioxide film,
- wherein the silicon dioxide film comprises a zinc oxide powder having a particle diameter of 0.2 μm or less, and
- wherein the silicon dioxide has a thickness between 50 to 150 nm.
A method for producing a coated phosphor, the method comprising:
- mixing a sulfide phosphor, an alkoxysilane, a zinc oxide powder having a particle diameter of 0.2 μm or less, and a catalyst in a solvent such that the sulfide phosphor is coated with a silicon dioxide film,
- wherein the silicon dioxide film comprises the zinc oxide powder, and
- wherein the zinc oxide powder is composed of the alkoxysilane.
A white light source comprising:
- a blue light emitting element formed on an element substrate;
- and
- a kneaded matter disposed on the blue light emitting element and formed by kneading, in a transparent resin, a red phosphor and either a green phosphor or a yellow phosphor,
- wherein a sulfide phosphor is coated with the green phosphor and a silicon dioxide film with a zinc oxide powder having a particle diameter of 0.2 μm or less comprised therein, and
- wherein the silicon dioxide has a thickness between 50 to 150 nm.
2 more elements
An illumination device comprising:
- a light-emitting structure comprising a transparent resin having a blue light emitting element therein;
- a substrate on which the light-emitting structure is arranged;
- and
- a phosphor sheet comprising a powder-state phosphor to obtain white light from blue light emitted from the blue light emitting element, the phosphor sheet disposed apart from the substrate,
- wherein the powder-state phosphor is formed by coating a sulfide phosphor with a silicon dioxide film comprising a zinc oxide powder having a particle diameter of 0.2 μm or less, and
- wherein the silicon dioxide has a thickness between 50 to 150 nm.
3 more elements
Dependencies are inferred from the claim text.