Oxide fluorescent material and light emitting device using the same

A method for producing an oxide fluorescent material, comprising:

• adjusting and mixing a first compound containing Ga and/or a second compound containing at least one first element M1 selected from the group consisting of Al, Sc, and In, a third compound containing Ge, a fourth compound containing Cr, optionally a fifth compound containing at least one second element M2 selected from the group consisting of Si, Ti, Zr, Sn, and Hf, and optionally a sixth compound containing at least one third element M3 selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb to provide a raw material mixture such that:
• when a total molar ratio of Ga and/or the at least one first element M1 in the composition of the oxide fluorescent material is 2, a molar ratio of the at least one first element M1 is a product of a parameter u and 2, wherein the parameter u is a numerical value of 0 or more and 1.0 or less, a molar ratio of Ga is a product of 2 and a value of 1 minus the parameter u, a molar ratio of the at least one second element M2 is a product of a parameter v and a parameter w, wherein the parameter v is a numerical value of 0 or more and 0.5 or less, wherein the parameter w is a numerical value of 1.0 or more and 3.0 or less, a molar ratio of Ge is a product of the parameter w and a value of 1 minus the parameter v, a molar ratio of Cr is the parameter y, wherein the parameter y is a numerical value of 0.005 or more and 1.0 or less, a molar ratio of the at least one third element M3 is a parameter z, wherein the parameter z is a numerical value of 0 or more and 0.5 or less;
• and
• heat-treating the raw material mixture at a temperature in a range of 800° C. or higher and 1,400° C. or lower in an atmosphere containing oxygen to obtain an oxide fluorescent material,
• wherein at least one selected from the group consisting of the first compound, the second compound, the third compound, and the fourth compound comprises an oxide.