RARE EARTH ALUMINUM GARNET-TYPE INORGANIC OXIDE, PHOSPHOR AND LIGHT-EMITTING DEVICE USING SAME

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The present inorganic oxide has a composition shown in general formula (1) : M2LnX2 (AlO4)3 (In the formula, M includes Ca, Ln includes Tb, and X includes at least one of Zr and Hf). Also, the number of Tb atoms in general formula (1) is 0.1-1. Further, the crystal structure of the inorganic oxide is a garnet structure. A phosphor consisting of this inorganic oxide can be excited by short-wavelength visible light, and can also emit narrow-band green light.