| 摘要 |
To provide a sialon-based phosphor capable of forming a thin film by mixing it with a resin, and giving a uniform photoluminescent light with high light emission intensity, and to provide a method for producing a sialon-based phosphor not having excessively large agglomerated particles and a wide particle size distribution, there is provided a method for producing an alpha-sialon based phosphor represented by the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>M<SUB>x</SUB>Ln<SUB>y</SUB>Si<SUB>12-(m+n)</SUB>Al<SUB>(m+n)</SUB>O<SUB>n</SUB>N<SUB>16-n</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> wherein M is at least one metal selected from Ca, Mg, Y and Li, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb, Yb and Ce, ax+by=m (assuming that the valence of metal M is a and the valence of lanthanide metal Ln is b), 0<x<=1.5, 0.3<=m<=4.5, and 0<n<2.25), wherein the silicon nitride raw material used as the raw material is a silicon nitride raw material powder comprising amorphous silicon nitride and crystalline silicon nitride.
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