Patent ID: 9340727
Filing Date: 2016-05-17
CPC Classification: C09K

Claim Text:
1. A method for producing film-coated alkaline-earth metal silicate phosphor particles, the method comprising the steps of: forming a first coating layer on a plurality of starter particles by treating the starter particles with an alkaline-earth metal compound solution; forming a second coating layer on the starter particles which have been coated with the first coating layer; forming a third coating layer on the starter particles which have been coated with the second coating layer; and after forming the third coating layer, drying and heat-treating the coated starter particles; wherein the starter particles are strontium-containing alkaline-earth metal silicate phosphor particles, wherein the second coating layer contains an aluminum organic metal compound, wherein the third coating layer contains a partially-hydrolyzed condensate of a silane organic metal compound, wherein the alkaline-earth metal compound solution contains at least 1 to 15% by mass of a strontium compound with respect to the starter particles and having a pH inclusively between 6 and 10.