Rare earth phosphovanadate phosphor and method for producing the same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorShozo Oshio
Life of this patent
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Abstract
Provided is a rare earth phosphovanadate phosphor that is excellent in emission characteristics and preferred also from the viewpoint of industrial production, and a production method thereof. The rare earth phosphovanadate phosphor includes at least a primary particle in which a linear uneven pattern including a plurality of ridge lines parallel to each other is formed on the surface of the particle. Further, the method for producing a rare earth phosphovanadate phosphor involves generating a mixture of a rare earth phosphovanadate phosphor and an alkali metal vanadate, and removing the alkali metal vanadate.
Claims19
A rare earth phosphovanadate phosphor comprising at least a primary particle in which a linear uneven pattern including a plurality of ridge lines parallel to each other is formed on a surface of the particle.
A method for producing a rare earth phosphovanadate phosphor, comprising:
- forming a mixture of a rare earth phosphovanadate phosphor and an alkali metal vanadate;
- and
- removing a substance comprising the alkali metal vanadate from the mixture,
- wherein the forming step is performed by a process comprising:
- mixing a rare earth compound, a phosphorous compound, and a vanadium compound in amounts to form the rare earth phosphovanadate phosphor with an alkali metal compound as a flux so that a blended material is formed;
- and
- firing the blended material so as to form the mixture, and
- the alkali metal vanadate comprises an alkali metal metavanadate, and
- the produced rare earth phosphovanadate phosphor comprises at least a primary particle in which a linear uneven pattern including a plurality of ridge lines parallel to each other is formed on a surface of the particle.
A method for producing a rare earth phosphovanadate phosphor, comprising:
- forming a mixture of a rare earth phosphovanadate phosphor and an alkali metal vanadate;
- and
- removing an alkali metal compound from the mixture,
- wherein the resulting rare earth phosphovanadate phosphor comprises a flocculate of primary particles,
- the primary particles forming the flocculate exhibit a pseudo regular octahedron shape that is a regular octahedron shape as a whole, but in which each edge present at a boundary of each surface is rounded,
- the alkali metal compound is a vanadate salt of an alkali metal, and
- the forming comprises:
- generating the rare earth phosphovanadate phosphor and the alkali metal vanadate separately;
- and
- mixing the rare earth phosphovanadate phosphor and the alkali metal vanadate as so to generate the mixture of the rare earth phosphovanadate phosphor and the alkali metal vanadate.
A method for producing a rare earth phosphovanadate phosphor, comprising:
- generating a mixture of a rare earth phosphovanadate phosphor and an alkali metal vanadate;
- and
- removing alkali metal vanadate from the mixture by a step comprising water washing of the mixture and extracting of the rare earth phosphovanadate phosphor,
- wherein the alkali metal vanadate comprises an alkali metal metavanadate, and
- the produced rare earth phosphovanadate phosphor comprises at least a primary particle in which a linear uneven pattern including a plurality of ridge lines parallel to each other is formed on a surface of the particle.
Dependencies are inferred from the claim text.