| 摘要 |
The present invention relates to an oxynitride phosphor comprising an alpha-sialon as the main component, which is represented by the general formula: MxSi12-(m+n)Al(m+n)OnN16-n:Lny (wherein 0.3<=x+y<1.5, 0<y<0.7, 0.3<=m<4.5, 0<n<2.25, and assuming that the atomic valence of the metal M is a and the atomic valence of the lanthanide metal Ln is b, m=ax+by) and in which the aggregation index, A1=D50/DBET<=3.0 or the aggregation index A2=D50/Dparticle<=3.0; and a production method and usage of the phosphor. The phosphor of the present invention has less aggregation and a narrow particle size distribution, and therefore is easy to uniformly mix with a resin or the like, and a high-brightness white LED can be easily obtained. D50 [mum]: The median diameter in the grain size distribution curve. DBET [mum]: The equivalent-sphere diameter calculated on the basis of a BET specific surface area. Dparticle [mum]: The primary particle diameter measured by the image analysis of a scanning electron micrograph.
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