高分子凝胶法合成YPO4:Sm^(3+)纳米荧光材料的结构与光学性能

Polyacrylamide gel synthesis, structure and optical properties of YPO_4:Sm^(3+) nanophosphors

采用高分子网络凝胶法合成Sm3+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Sm3+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:Sm3+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Sm3+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。

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.