Yb^(3+),Er^(3+)共掺MWO_4(M=Cd,Ba)纳米晶体的制备及发光性能

Preparation and luminescence properties of Yb^(3+),Er^(3+) co-doped MWO_4(M=Cd,Ba) nanocrystals

以CTAB为表面活性剂,采用水热法合成了Yb,Er共掺MWO4(M=Cd,Ba)纳米晶体.采用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱(EDS)和荧光分光光度计等手段对产物的组成、形貌和荧光性质进行了系统表征.结果表明:Yb3+,Er3+掺杂钨酸盐的发光条件随着M种类的不同而有较大的差异,水热合成的CdWO4:Yb3+,Er3+纳米晶体在980 nm激光照射下用肉眼可观察到明显的绿色上转换发光,而BaWO4:Yb3+,Er3+晶体高温煅烧到900℃才能观察到明亮的绿色发光.研究了温度对上转换发光强度的影响,讨论了两种晶体的上转换发光性质.

Yb^3＋, Er^3＋ co-doped MWO4 （M = Cd, Ba） nanocrystals were prepared via a hydrothermal method, and the composition, morphology and fluorescence property of the products were characterized by x-ray diffraction（XRD）, scan electron microscope（SEM）, energydispersive x-ray spectroscope（EDS） and fluorescence spectrophotometer. The results show that the luminescence condition of Yb^3＋, Er^3＋ co-doped tungstate is dependent on the type of M. CdWO4 ：Yb^3＋, Er^3＋ nanocrystals synthesized by the hydrothermal method can emit green up- conversion fluorescence when they are excited by 980 nm infrared light. However, BaWO4： Yb^3＋, Er^3＋ can emit the intense green up-conversion fluorescences when they are annealed at 900 ℃. The effect of temperature on the up-conversion fluorescent intensity was also studied, and the properties of the up-conversion luminescence were discussed.