PHOSPHOR SURFACE TREATMENT METHOD

摘要

A red phosphor in the form of a Mn-activated complex fluoride having the formula: A2MF6:Mn wherein M is one or more tetravalent elements selected from Si, Ti, Zr, Hf, Ge, and Sn, and A is one or more alkali metals selected from Li, Na, K, Rb, and Cs, and contains at least Na and/or K, is surface treated with a treating solution containing a surface treating agent selected from an organic amine, quaternary ammonium salt, alkyl betaine or fluorochemical surfactant, alkoxysilane, and fluorinated polymer.

主权项

1. A phosphor surface treatment method comprising the step of treating the surface of a red phosphor with a treating solution containing a surface treating agent, wherein
said red phosphor is a Mn-activated complex fluoride having the formula (1):
A2MF6:Mn  (1)wherein M is one or more tetravalent elements selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, and A is one or more alkali metals selected from the group consisting of Li, Na, K, Rb, and Cs, and contains at least Na and/or K, and
said surface treating agent is selected from the group consisting of: (A) an organic amine having the formula (2):
NR1R2R3  (2)wherein at least one of R1, R2 and R3 is a substituted or unsubstituted monovalent hydrocarbon group, and the remainder is hydrogen,
(B) a quaternary ammonium salt having the formula (2-1):
R4R5R6R7N+X−  (2-1)wherein R4, R5, R6 and R7 each are a substituted or unsubstituted monovalent hydrocarbon group, and X is a halogen atom,
(C) an alkyl betaine or a fluorochemical surfactant, having the formula (2-2):
R8R9R10N+CH2COO−  (2-2)wherein R8, R9 and R19 each are a substituted or unsubstituted monovalent hydrocarbon group,
(D) an alkoxysilane having the formula (2-3):
R11Si(OR12)(OR13)(OR14)  (2-3)wherein R11 is a substituted or unsubstituted monovalent hydrocarbon group or alkoxy group, R12, R13 and R14 each are a substituted or unsubstituted monovalent hydrocarbon group, and
(E) a fluorinated polymer.