| 摘要 |
An Eu-activated beta-sialon phosphor showing a high luminance, the use thereof and the method of producing the same. The beta-sialon phosphor includes, as a matrix, a beta-sialon crystal represented by a general formula: Si6-zAlzOzN8-z (0<z<4.2), wherein Eu, which serves as an activator, is solid-soluted in the beta-sialon crystal, and the ratio of Eu2+/(Eu2++Eu3+) is 0.8 or more. It is preferred that the amount of Eu in the solid solution is 0.1 to 1 mass % with respect to the mass of the beta-sialon crystal.
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