稀土掺杂花状钨酸钙纳米晶溶剂 热法合成及其发光性能

以水-乙二胺二元溶剂热法及热处理合成了四方晶系稀土掺杂花状钨酸钙纳米晶。考察了混合溶剂比例、煅烧温度及掺杂稀土离子等条件对钨酸钙发光性能的影响，并分析了其形成机理。利用X射线衍射（XRD）、扫描电镜（SEM）、傅里叶变换红外光谱（FT-IR）和光致发光（PL）光谱等对钨酸钙结构、形貌及其性能进行了表征。结果表明：在水与乙二胺体积比为1∶2、反应温度为160 ℃、反应时间为24 h条件下合成前驱物，前驱物经800 ℃煅烧得到四方晶系稀土掺杂花状钨酸钙纳米晶；掺杂不同稀土离子得到在紫外光激发下发出不同颜色光的钨酸钙基荧光粉。

Solvothermal synthesis and luminescence properties of flower-like rare-earth-doped CaWO4 nanostructures

The tetragonal phase of flower-like rare-earth-doped CaWO4 nanostructures have been solvothermally synthesized in a binary solution of water and ethylamine.The effects of the mix ratio of water and ethylamine，sintering temperature，and the different types of rare earth-doped CaWO4 on luminescence of CaWO4：Tb3+ were investigated in detail.The structure，morphology，and performance of the as-prepared samples were characterized by XRD，SEM，FT-IR，and PL.Then the growth mechanism for the formation of flower-like CaWO4：Tb3+ nanostructures was described.Results revealed that flower-like rare- earth-doped CaWO4 nanostructures obtained by solvothermal treatment at 160 ℃ for 24 h，in water and ethylamine with the volume ratio of 1∶2 solvent，and then sintered at the temperature of 800 ℃.The different types of rare earth-doped CaWO4 showed different color luminescences with the excitation of UV light.