| abstract |
The present invention relates to an oxynitride phosphor comprising an ±-sialon as the main component, which is represented by the general formula: M x Si 12 - (m+n) Al (m+n) O n N 16-n :Ln y (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, A 1 =D 50 /D BET ¤ 3.0 or the aggregation index A 2 =D 50 /D particle ¤ 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. D 50 [µm] : The median diameter in the grain size distribution curve. D BET [µm] : The equivalent-sphere diameter calculated on the basis of a BET specific surface area. D particle [µm] : The primary particle diameter measured by the image analysis of a scanning electron micrograph. |