Abstract: Rare earth luminescent material was modified with silane coupling agent, which was further encapsulated with a layer of poly（methyl methacrylate ）(PMMA) via in-situ emulsion polymerization. FTIR, TG and SEM showed that PMMA was uniformly grafted on the surface of rare earth luminescence materials forming a thin layer. Such PMMA coated rare earth luminescence materials maintained good fluorescence performance and their original luminescence centers.

Key words: polymethyl methacrylate, masterbatch, rare earth luminescent material, coupling agent