COMPLEX FLUORIDE PHOSPHOR AND METHOD FOR PRODUCING SAME

摘要

Provided is a method for producing a phosphor having a s chemical composition represented by formula (I), A2MF6:Mn (I) (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, and M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn.), the method comprising preparing a first hydrofluoric acid solution containing M and a second hydrofluoric acid solution containing A as well as either dissolving a compound containing Mn in either the first hydrofluoric acid solution or the second hydrofluoric acid solution or preparing a separate solution in which the compound containing Mn is dissolved. When the solutions are mixed to precipitate the phosphor of the formula (I), the solutions are mixed so that the concentration of M is 0.1 to 0.5 mol/liter when all the solutions are mixed. According to the present invention, a complex fluoride phosphor having excellent luminescence properties can be produced stably with high yield.

主权项

1. A method for producing a complex fluoride phosphor having a chemical composition of the formula (I):
A2MF6:Mn  (I)wherein A is one or more alkali metal selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and includes at least sodium and/or potassium, and M is one or more tetravalent element selected from the group consisting of silicon, titanium, zirconium, hafnium, germanium and tin, the method comprising the steps of: providing a first hydrofluoric acid solution which contains M and a second hydrofluoric acid solution which contains A,
dissolving a manganese-containing compound in either of the first hydrofluoric acid solution and the second hydrofluoric acid solution or separately preparing a solution in which a manganese-containing compound is dissolved, and mixing together the solutions so as to precipitate the phosphor of formula (I) such that the concentration of M, when the solutions are completely mixed, is at least 0.1 mol/L and not more than 0.5 mol/L.