Patent ID: 8636920

Claim:
A method for producing a nitride or oxynitride phosphor, comprising a step of heating a raw material for the phosphor under a nitrogen-containing atmosphere, wherein an alloy for a phosphor precursor is used as the whole or part of the raw material for the phosphor, wherein in the step of heating the raw material for the phosphor, the whole or part of a raw material consists of a nitrogen-containing alloy, is performed under the nitrogen-containing atmosphere at a temperature equal to or higher than a temperature 300° C. higher than the melting point of the nitrogen-containing alloy, and wherein the method satisfies at least one of requirements 1) to 4): 1) the whole or part of the alloy for a phosphor precursor is a nitrogen-containing alloy having a total content of metal elements of 97% by weight or less; 2) the heating rate is set at 9° C./min or less in the temperature range from a temperature 100° C. lower than the melting point of the alloy for a phosphor precursor to a temperature 30° C. lower than the melting point of the alloy for a phosphor precursor; 3) a nitride or an oxynitride containing one or two or more metal elements constituting the phosphor is used as the raw material for the phosphor together with the alloy for a phosphor precursor; and 4) a powder of the alloy for a phosphor precursor is used as the alloy for a phosphor precursor, the powder having an angle of repose of 45° or less.