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AssigneesKasei Optonix, Ltd., Mitsubishi Chemical Corporation
InventorsNaoto Kijima, Yasuo Shimomura, Tetsuji Umebara, Ilgnatius Wuled Lenggoro, Kikuo Okuyama
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A process for producing fine phosphor particles having a high crystallinity, having a small amount of aggregated particles and comprising fine particles, thus capable of forming a homogeneous and dense high brightness fluorescent layer when applied to e.g. a cathode ray tube, a fluorescent lamp or PDP, and having a high purity, a uniform chemical composition and excellent emission properties, at a low cost, is provided. A process for producing a phosphor, which comprises heating droplets of a solution containing metal elements constituting the phosphor to carry out pyrolysis to obtain the phosphor, wherein the above heating is carried out in the coexistence of an additive comprising a metal or a metal compound to carry out the pyrolysis at an average crystal growth rate of at least 0.002 μm3/sec.
A process for producing a phosphor, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets in the presence of an additive that promotes phosphor crystal growth and comprises a metal or a metal compound, wherein the pyrolysis conditions and the amount of the additive are such that the average crystal growth rate is at least 0.002 μm3/sec.
A process for producing a phosphor, which comprises forming fine droplets by spraying into a gas a solution containing metal elements constituting the phosphor and an additive that promotes phosphor crystal growth and comprises a metal or a metal compound is sprayed into a gas to form the above fine droplets, which are dried to obtain, drying the fine droplets to produce metal salt particles or metal complex particles, and pyrolyzing the metal salt particles or metal complex particles, wherein during pyrolysis the additive is decomposed or evaporated to produce a liquid state or a gaseous state and wherein the pyrolysis conditions and the amount of the additive are such that the average crystal growth rate is at least 0.002 μm3/sec.
A process for producing a phosphor, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets in the presence of a substance for thin film layer formation, wherein the substance for thin film layer formation is precipitated on the surface of phosphor particles during pyrolysis to form a thin film layer having an average film thickness of at least 10 nm and wherein the thin film layer on the surface of the phosphor particles is removed after pyrolysis.
The process for producing a phosphor according to claim wherein the solution is preliminarily prepared to satisfy the relation (A×0.1)≦B, where A is the total number of mols of the metal elements constituting the phosphor and B is the total number of mols of the metal elements contained in the substance for thin film layer formation.
A process for producing a phosphor, which comprises forming fine droplets by spraying into a gas a solution containing metal elements constituting the phosphor and a substance for thin film layer formation, drying the fine droplets to produce metal salt particles or metal complex particles and pyrolyzing the metal salt particles or metal complex particles, wherein during pyrolysis the substance for thin film layer formation is decomposed or evaporated to produce a liquid state or a gaseous state, wherein the substance for thin film layer formation is precipitated on the surface of phosphor particles during pyrolysis to form a thin film layer having an average film thickness of at least 10 nm.
A process for producing a phosphor, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets in an atmosphere gas containing a gaseous substance comprising (a) a metal chloride in a gaseous state or (b) a metal hydroxide in a gaseous state.
A process for producing a phosphor which comprises forming fine droplets by spraying into a gas a solution containing metal elements constituting the phosphor drying the fine droplets to produce metal salt particles or metal complex particles, and pyrolyzing the metal salt particles or metal complex particles in an atmosphere gas containing a gaseous substance comprising (a) a metal chloride in a gaseous state or (b) a metal hydroxide in a gaseous state.
A process for producing phosphor particles, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets while contacting the droplets with a dispersant in which said phosphor particles are dispersed so that a plurality of phosphor particles are dispersed in a particle of the dispersant.
A process for producing a phosphor which comprises forming fine droplets by spraying into a carrier gas a solution containing metal elements constituting the phosphor, drying said fine droplets produce a solid phosphor raw material, heating said solid phosphor raw material to form a precursor of the phosphor, and pyrolyzing the said solid phosphor raw material while contacting said precursor of the phosphor and the dispersant in a molten state, to form a plurality of phosphor particles comprising a crystal phase of the above phosphor particles as the main phase, in a particle of the dispersant suspended in the carrier gas.
A process for producing a phosphor, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets in the presence of a substance for thin film layer formation, wherein the substance for thin film layer formation is precipitated on the surface of phosphor particles during pyrolysis to form a thin film layer having an average film thickness of at least 10 nm, and
A process for producing a phosphor, which comprises forming droplets of a solution containing metal elements constituting the phosphor and pyrolyzing the droplets in an atmosphere gas containing a gaseous substance comprising a hydrogen halide in a gaseous state wherein the gaseous substance in the atmosphere gas for the pyrolysis is present in an amount of from 0.001 to 5 vol % based on the atmosphere gas.
Dependencies are inferred from the claim text.