【摘要】 利用共沉淀法通过控制稀土离子浓度、沉淀温度等得到稀土氧化物前驱体沉淀,再将其和H3BO3 按化学计量比混合煅烧制备出了平均粒径在 0. 5~1. 0μm的球形、粒径分布较小和无团聚的 (Y,Gd)BO3∶Eu荧光粉,其性能在一些方面优于商用荧光粉。利用X射线衍射、SEM、粒度分析仪和PL光谱进行表征。研究了不同的煅烧温度对荧光粉性能的影响,结果发现用本实验方法在 800 ℃煅烧即可得到纯相的(Y,Gd)BO3∶Eu。而传统固相合成纯相的(Y,Gd)BO3∶Eu反应温度高达 1 200℃。因本方法工艺较易控制,适于在工业生产上推广。更多还原

【Abstract】 Eu-doped （Y,Gd）BO₃∶Eu phosphor with spherical particle morphology, small size, high crystallinity and good photoluminescence （PL）intensity was prepared by co-precipitation method. Ultrafine precursor powders were obtained by controlling the solution concentration of Y³⁺,Gd³⁺,Eu³⁺ and temperature of system, the precursor is amorphous and soft when the system temperature maintain from 50 ℃ to 70 ℃. The phosphor particle size is influenced by the solution concentration, and the mean size of the （Y,Gd）BO₃∶Eu particles decreased from 2.3 μm to 0.8 μm when the solution concentration changed from 0.2 mol/L to （0.5） mol/L and shifted to the larger size with the further increase of the solution concentration. Conventional solid state （reaction） require higher sintering temperature above 1 200 ℃ for pure （Y,Gd）BO₃∶Eu phase. However, the co-（precipitation） allows a significant decrease of sintering temperature and the phosphor sintered at 800 ℃ have pure orthorborate phase already. The X-ray diffraction peak intensities increased with increasing temperature. The phosphors prepared at different temperature 800, 1 000, 1 200 and 1 300 ℃ were characterized by （X-ray） diffraction, SEM, particle size determination and photoluminescence. In addition, the characteristics of the particle were compared with those of a commercial product. Crystallinity,particle size and luminescence （intensity） are dependent on sintering temperature. The morphology and size of synthesized particles are strongly effected by sintering temperature. The phosphor particles prepared at 1 200 ℃ have the best （characteristics,） such as completely spherical shape, filled morphology, fine particle size, no-aggregation, and the commercial product prepared by conventional solid state reaction has a irregular shape with aggregation, the particles （began） to （agglomerate） and the particle size became larger at an firing temperature of 1 300 ℃. The （luminescence） intensities of the phosphors （increase） with the sintering temperature and the brightness of （phosphor） increase with increasing temperatures due to favorable crystallization and has a maximum values at （1 200 ℃） when excited with UV light. The particles （sintered） at 1 200 ℃ exhibited better morphology than those of a commercial product.更多还原