Mn-activated complex fluoride phosphor and method of producing thereof
Provided is a method of producing a Mn-activated complex fluoride phosphor, the method including: mixing a red phosphor as a Mn-activated complex fluoride represented by the following formula (1): K 2 MF 6 :Mn (1) wherein M is one or two or more of tetravalent elements selected from the group consisting of Si, Ti, Zr, Hf, Ge and Sn and necessarily includes Si, with K 2 MnF 6 in solid state and optionally with a hydrogenfluoride represented by the following formula (2): AF. n HF (2) wherein A is one or two or more of alkali metals and/or ammonium selected from the group consisting of Li, Na, K, Rb and NH 4 and necessarily includes K, and n is a number of 0.7 to 4, in solid state; and heating the resulting mixture at a temperature of 100 to 500° C. According to the present invention, it is possible to obtain a Mn-activated complex fluoride phosphor which can be used with smaller amount as compared to those according to the related art.
1. A method of producing a Mn-activated complex fluoride phosphor, the method comprising:
mixing a red phosphor as a Mn-activated complex fluoride represented by the following formula (1):
K 2 MF 6 :Mn (1)
wherein M is one or two or more of tetravalent elements selected from the group consisting of Si, Ti, Zr, Hf, Ge and Sn and necessarily includes Si, with K 2 MnF 6 in solid state; and
heating the resulting mixture at a temperature of 100° C. to 500° C., wherein
a hydrogenfluoride represented by the following formula (2):
AF. n HF (2)
wherein A is one or two or more of alkali metals and/or ammonium selected from the group consisting of Li, Na, K, Rb and NH 4 and necessarily includes K, and n is a number of 0.7 to 4, in solid state, is mixed with K 2 MnF 6 .
2. The method of claim 1 , wherein a reaction mixture obtained by the heating is washed with an inorganic acid solution or a fluoride solution to remove unnecessary components, followed by solid-liquid separation and drying the separated solid.