Aluminate fluorescent material, light emitting device using the same, and method of producing aluminate fluorescent material

A method of producing an aluminate fluorescent material, comprising:

• mixing compounds that contain elements to provide a composition containing a first element that contains one or more elements selected from Ba and Sr, a second element that contains Mg and Mn, and Al and O to obtain a raw material mixture, and
• heat-treating the raw material mixture, wherein:
• in the composition, when a molar ratio of Al is taken as 10, a total molar ratio of the first element is a value of a parameter a, a total molar ratio of the second element is a value of a parameter b, a molar ratio of Sr is a product of a value of a parameter m and the value of the parameter a, a molar ratio of Mn is a product of a value of a parameter n and the value of the parameter b, and
• the values of the parameters a and b satisfy the following requirement (1), the value of the parameter m satisfies the following requirement (2), and the value of the parameter n satisfies the following requirement (3):
• 0.7<b<a≤0.5b+0.5<1.0 (1), and
• 0≤m≤1.0 (2)
• wherein the value of the parameter n satisfies 0.6≤n<0.7, or the product of the value of the parameter b and the value of the parameter n (b×n) is a value satisfying 0.3<b×n<0.6.