SiO2-LnPO4核-壳结构荧光材料的均相沉淀法合成及表征

Synthesis with homogeneous precipitation method and Characterization of SiO2-LnPO4 core-shell fluorescent material

摘要:

以Stöber反应为基础，制备了粒径为900±50 nm的SiO2非晶形球形颗粒，产品粒径均匀、单分散性良好，以此SiO2颗粒为内部核层材料，采用均相沉淀法，通过三聚磷酸钠（Na5P3O10，TPP）的逐渐水解所生成的磷酸根与溶液中的稀土离子在价格低廉的SiO2表面定点沉积，生成了发绿光LnPO4 (Ln=La: Ce, Tb) 壳层，从而得到了SiO2-LnPO4核-壳结构材料。该核-壳结构颗粒粒径为1.5±0.1 μm，具有明显的荧光性质，其最大荧光发射峰位于547 nm处。由于内核材料不含稀土元素，且形貌规整，故该产品可降低稀土磷酸盐绿色荧光粉的合成成本，同时提高荧光粉的应用性能，在发光照明行业有着重要的应用前景。

Abstract:

Based on classical Stöber reaction, Silica particles were synthesized. These particles were non-crystalline solid granules with smooth surfaces and good monodispersity. The average size was 900±50 nm. Rare earth ions combined with the free phosphate ions hydrolyzed by tripolyphosphate (TPP) on surface of silica, the SiO2-LnPO4 (Ln=La: Ce, Tb) core-shell particles were thus obtained by homogeneous precipitation method and their size were 1.5±0.1 μm. The core-shell product had obvious fluorescence property and the maximum fluorescent emission peak was at 547 nm. With no rare earth element in the core and with uniform morphology and size, this SiO2-LnPO4 material could decrease the synthetic cost and improve the application property of the LnPO4 green phosphor. This material might have important application prospect in the illumination field.