Sialon phosphor

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PROBLEM TO BE SOLVED : To provide a low-cost sialon phosphor which is prepared by subjecting a rare earth metal to a solution treatment and enhances the luminance of a white diode which uses a blue-emitting diode as a light source. SOLUTION : This sialon phosphor is a powder comprising at least 40 wt.% α-sialon, at most 40 wt.% β-sialon, and at most 30 wt.% unreacted silicon nitride. The α-sialon has a structure of a Ca-α-sialon represented by the formula : (Cax, My)(Si, Al)12(O, N)16[wherein M is at least one metal selected from among Eu, Tb, Yb, and Er; 0.05COPYRIGHT : (C)2004, JPO