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

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An inorganic oxide has a composition represented by General formula : M 2 LnX 2 (AlO 4 ) 3 (where M includes Ca, Ln includes Eu, and X includes at least either one of Zr and Hf). Then, a crystal structure of the inorganic oxide is a garnet-type structure. Eu 3+ in the inorganic oxide emits a plurality of bright line-like fluorescent components, and a principal bright line of the fluorescent component is present within a wavelength range of 600 nm or more to less than 628 nm. Moreover, a maximum height of the bright line present within a wavelength range of 700 nm or more to less than 720 nm is less than 60% of a maximum height of the principal bright line. A phosphor composed of the inorganic oxide can emit narrowband red light with good color purity.