National Institute for Materials Science

Kyouta Ueda

Mamoru Mitomo

Tadashi Endo

Masakazu Komatsu

An oxynitride phosphor activated by a rare earth element, represented by the formula Ca Si Al O N : Eu Dy , wherein stabilizing metal (Ca) is substituted partially by Eu or Eu and Dy where 0.3<x<1.5, 0.01<y<0.7, 0&lE;z<0.1, 0.6<m<3.0 and 0<n<1.5.

Oxynitride phosphor activated by a rare earth element, and sialon type phosphor

A sialon type phosphor in the form of a powder comprising at least 40 wt % of &agr;-sialon represented by the formula (Ca ,M )(Si,Al) (O,N) (where M is at least one metal selected from the group consisting of Eu, Tb, Yb and Er, 0.05<(x&plus;y)<0.3, 0.02<x<0.27 and 0.03<y<0.3) and having a structure such that Ca sites of Ca-&agr;-sialon are partially substituted by other metal M, at most 40 wt % of &bgr;-sialon, and at most 30 wt % of unreacted silicon nitride.

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Kyouta Ueda