Chlorosilicate Fluorescent Material Surface Modification

The patent applies composite materials by combining chlorosilicate fluorescent material with fluorine-containing compounds to form a surface-modified composite structure. The fluorine-containing compound forms a protective layer on the surface of the chlorosilicate particles, creating a composite material that retains the high luminous efficiency of the chlorosilicate while adding environmental stability and durability through the fluorine coating.

The patent uses an inert gas atmosphere (nitrogen or rare gas) during the heat treatment process to prevent unwanted chemical reactions and oxidation of the chlorosilicate fluorescent material. This inert environment protects the material during processing and contributes to the final product's resistance to environmental degradation in high temperature and humidity conditions.

The patent performs heat treatment in an inert gas atmosphere (nitrogen or rare gas) to achieve high crystallinity without exposing the material to oxidizing or humid conditions during processing. This inert environment prevents structural degradation while allowing the beneficial crystalline structure to form, and the resulting structure maintains stability in subsequent humid service conditions.

The patent creates a composite structure where fluorine-containing compounds are incorporated into or on the crystalline chlorosilicate structure. This composite approach allows the material to achieve high crystallinity for improved light emission while the fluorine component provides environmental stability and protects the crystal structure from humidity-induced degradation.