碱性体系下水热合成ZnS∶Sm微球及其发光特性

Fabrication and optical properties of ZnS∶Sm microsphere synthesized by hydrothermal method in alkalic system

以硝酸锌和硫粉分别为锌源和硫源,利用水热法在碱性体系下合成了具有光谱下转换功能的Zn S∶Sm微球。探讨了Sm3+掺杂浓度、反应温度对Zn S∶Sm微球的晶相结构和发光性质的影响。采用SEM、XRD、PL和PLE等对微球的晶体形貌、物相结构和荧光性能进行表征。结果表明,Sm3+掺杂浓度越高,晶体中发光中心越多、发光越强,但Sm3+掺杂浓度达到摩尔分数5%时,在浓度淬灭和Zn S晶格畸变的双重作用下,导致发光减弱。反应温度越高,晶体生长越完整,晶体的发光越强。

ZnS∶Sm microsphere with spectral down-conversion function was prepared by hydrothermal method in the alkaline system using zinc nitrate and sulfur powder as zinc and sulfur sources, respectively. The influences of Sm^3＋ doping concentration and reaction temperature on the crystal structure and luminescence property of Zn S ∶ Sm microsphere were discussed. XRD, PL, PLE and SEM were used to determined the morphology and property of ZnS ∶ Sm microsphere. The results show that the increasing of Sm^3＋ doping concentration leads to the increasing of luminescence center and the enhancing of luminescent intensity. But when the doped concentration is up to 5% of mole fraction, concentration quenching and Zn S lattice deformation result in the decreasing of luminescent intensity. And the high reaction temperature contributes to the growth and luminescence of microsphere.