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中文摘要：
采用高分子网络凝胶法合成Sm^3＋掺杂YPO4纳米荧光材料，利用X射线衍射（XRD）、透射电镜（TEM）、傅里叶红外光谱（FT-IR）和荧光光谱等对合成产物的晶体结构、颗粒尺寸、形貌和光学性能进行分析与测试，并研究 Sm^3＋掺杂浓度（n（Sm）/n（Y＋Sm））的影响。结果表明，采用高分子网络凝胶法合成的 YPO4：Sm^3＋为单一的四方晶系磷钇矿结构的 YPO4晶体，颗粒尺寸约为20 nm。其激发光谱在405 nm 处有一最强激发带，属于 Sm^3＋的6H5/2-4K11/2跃迁，发射光谱在603 nm^处有一最强峰，属于Sm3＋的4G5/2-6H7/2跃迁。激发和发射光谱测试结果表明，Sm3＋掺杂YPO4荧光材料可以被405 nm波长的光有效地激发，发射出强烈的Sm3＋特征橙红色光。当Sm3＋掺杂浓度高于2%时观察到浓度猝灭现象，浓度猝灭机理为电多极-电多极相互作用。
英文摘要：
Sm3＋ doped YPO4 nanocrystals were successfully synthesized via a polyacrylamide gel route. The crystal structure, particle size, morphology, and optical properties of the as-synthesized products were investigated by XRD, SEM, FT-IR and PL. The results reveal that the as-prepared samples have single xenotime structure with particle sizes about 20 nm. The photoluminescence spectra of Sm3＋ doped YPO4 nanophosphors show a characteristic orange-red luminescence of Sm3＋under 405 nm light excitation. Furthermore, the concentration quenching was observed when the Sm3＋doping content was over 2%, and the concentration quenching mechanism was verified as dipole-dipole interaction.
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