Oxide phosphor, light-emitting device, and method for producing oxide phosphor

A method for producing an oxide phosphor, the method comprising:

• preparing a raw material mixture by adjusting and mixing a first compound containing Li, a second compound containing at least one second element M2 selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, a third compound containing at least one third element M3 selected from the group consisting of Si, Ge, Ti, Zr, Sn, and Hf, a fourth compound containing Cr, and optionally, a fifth compound containing at least one first element M1 selected from the group consisting of Na, K, Rb, and Cs or a sixth compound containing at least one fourth element M4 selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb such that, when a total molar ratio of the Li and the first element M1 contained as necessary per one mole of a composition of the oxide phosphor is 2, a molar ratio of the Li is a product of 2 and a number in a range of 0 to 1.0, a molar ratio of the first element M1 is a product of 2 and a variable u within a range of 0 to 1.0, a molar ratio of a total of the second element M2 is a variable v within a range of 0.8 to 3.0, a molar ratio of the third element M3 is a variable w within a range of 1.8 to 6, a molar ratio of the Cr is a variable y in a range of 0.005 to 1.0, and a molar ratio of the fourth element M4 is a variable z in a range of 0 to 0.5;
• and
• obtaining an oxide phosphor by heat-treating the raw material mixture in an atmosphere containing oxygen at a temperature in a range of 800° C. to 1200° C.,
• wherein at least one compound selected from the group consisting of the first compound, the second compound, the third compound, and the fourth compound is an oxide.