SiO2/LaF3:Eu3＋ core-shell structural luminescence particles were prepared by a wet method, and the structure and luminescence properties were characterized. XRD patterns showed that the coated LaF3:Eu3＋ layer took a cubic crystal phase. FTIR spectra indicated that the citric acid was modified on the silica surface. TEM images presented that the core-shell composite particles were all in sphere shape, and the coating layer was about 10～20 nm. The photoluminescence properties were shown to be the same as those of the pure LaF3:Eu3＋, and the strong emission peak is near 589 nm which is corresponding to 5D0—7F1 magnetic dipole transition of Eu3＋, suggesting that Eu3＋ is located at the same lattice phase in both the core-shell particles and the pure particles.

Key words: LaF3:Eu3＋, core-shell structure, luminescence