Tb3+掺杂Gd2Sn2O7纳米荧光材料的制备与光学性能

摘要

采用共沉淀-水热法合成Tb3+掺杂Gd2Sn2O7纳米荧光材料，并采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外光谱(FT-IR)、拉曼光谱(Raman)和荧光光谱对合成产物的晶体结构、颗粒尺寸、形貌和光学性能进行研究。研究结果表明水热合成产物为单一相立方烧绿石结构Gd2Sn2O7：Tb3+晶体，产物由尺寸约为50~70 nm的一次纳米颗粒团聚而成的不规则球。激发光谱和发射光谱测试结果表明，Gd2Sn2O7：Tb3+样品可以被379 nm的紫外光有效地激发而发射出纯度高的Tb3+离子特征的绿光，在高浓度Tb3+掺杂时可观察到Tb3+发光浓度猝灭现象。在样品的激发光谱中观察到不同激发带的猝灭浓度并不相同，并对其原因进行了分析。%Phase-pure Tb3+ doped Gadolinium Stannates (Gd2Sn2O7) nanocrystals were successfully synthesized via a co-precipitation process combined with hydrothermal route. The crystal structure, particle size, morphology, and optical properties of the as-synthesized products were investigated by XRD, SEM, TEM, FT-IR, Raman and PL. The results reveal that the as-prepared samples with phase-pure pyrochlore structure are fabricated, which presents irregular sphere shape with nanocrystals of size about 50~70 nm. The photoluminescence spectra of Tb3+ doped Gd2Sn2O7 nanophosphors show a dominating green-emitting line at 543 nm under 379 nm excitation. Meanwhile, the concentration quenching phenomenon was observed. Furthermore, the different excitation bands show different quenching concentration of activator ions.