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以Stber反应为基础,制备了粒径为(900±50)nm的SiO2非晶型球形颗粒,产品粒径均匀、单分散性良好,以该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547nm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。
Based on the Stber reaction, amorphous spherical particles of (900 ± 50) nm in size were prepared. The products had uniform particle size and good monodispersion. The SiO2 particles were used as the inner layer material and the homogeneous precipitation method , The phosphate formed by the gradual hydrolysis of sodium tripolyphosphate (NaP3O10, TPP) and the rare earth ions in the solution are fixedly deposited on the cheap SiO2 surface to form a green-emitting LnPO4 (Ln = La: Ce, Tb) Layer, thereby obtaining a SiO2-LnPO4 core-shell structure material. The core-shell structure of the particle size (1.5 ± 0.1) μm, with obvious fluorescence properties, the maximum fluorescence emission peak at 547nm Department. As the core material does not contain rare earth elements, and the morphology is regular, the product can reduce the synthesis cost of the rare earth phosphate green phosphor and improve the application performance of the phosphor, which has an important application prospect in the luminous lighting industry.