METHOD FOR PRODUCING COATED ALKALINE EARTH METAL SILICATE PHOSPHOR PARTICLES

摘要

Disclosed herein is a method for producing film-coated alkaline-earth metal silicate phosphor particles that have a coating film having high moisture resistance and water resistance and that can have improved light-emitting characteristics.;Strontium-containing alkaline-earth metal silicate phosphor particles are pretreated with an alkaline-earth metal compound solution whose strontium compound concentration is 1 to 15% by mass with respect to the phosphor particles and whose pH is 6 or higher but 10 or lower. Then, a base layer of an aluminum organic metal compound is formed on the surface of the pretreated phosphor particles. Then, the phosphor particles are coated with a coating material composed of a partially-hydrolyzed condensate of a silane organic metal compound, and are then dried and heat-treated to form, on their surface, a coating film made of an amorphous inorganic compound mainly containing Si and O.

主权项

1. A method for producing film-coated alkaline-earth metal silicate phosphor particles having, on their surface, a coating film made of an amorphous inorganic compound mainly containing Si and O, the method comprising the steps of:
forming a base layer of an aluminum organic metal compound on a surface of particles of a strontium-containing alkaline-earth metal silicate phosphor; coating the particles with a coating material composed of a partially-hydrolyzed condensate of a silane organic metal compound; and drying and heat-treating the coated alkaline-earth metal silicate phosphor particles, wherein before the step of forming a base layer, the alkaline-earth metal silicate phosphor particles are pretreated with an alkaline-earth metal compound solution containing at least 1 to 15% by mass of a strontium compound with respect to the alkaline-earth metal silicate phosphor particles and having a pH of 6 or higher but 10 or lower.