Patent ID: 10214687

Abstract:
Provided is a method for producing a red phosphor which is a Mn-activated complex fluoride represented by formula (1), A2MF6:Mn (1) (M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn, and A is one type or more of an alkali metal selected from Li, Na, K, Rb, and Cs, and includes at least Na and/or K.), wherein, as a reactive source, a solid of a complex fluoride represented by formula (2), A2MF6 (2) (M and A are as described above) and a solid of a manganese compound represented by formula (3), A2MnF6 (3) (A is as described above) are mixed and heated at a temperature of from 100° C. to 500° C. According to the present invention, a Mn-activated complex fluoride phosphor having favorable luminescence properties can be obtained without using hydrofluoric acid in a main step.