COMPLEX METAL OXIDE, PHOSPHOR , PHOSPHOR PASTE AND LIGHT-EMITTING DEVICE

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Disclosed is a complex metal oxide which enables to obtain a phosphor exhibiting higher emission luminance. Also disclosed are a phosphor containing such a complex metal oxide, a phosphor paste and a light-emitting device. The complex metal oxide contains the following (1), (2) and (3) as metal elements : (1) an alkaline earth metal element selected from Ba, Ca and Mg; (2) aluminum (Al); and (3) at least one element (M) selected from rare earth elements and manganese. In this connection, when the molar ratio of Ba : Ca : Mg : Al : M is expressed as a : b : c : d : e, the following relations are satisfied : 0.3 ≤ a ≤ 8, 0 ≤ b < 12.5, 0 ≤ c < 12.5, 11 ≤ a + b + c ≤ 13, 13 ≤ d ≤ 15, 0.0001 ≤ e ≤ 1.0.