YF_3∶Yb,Er,Tm纳米晶:低温固相制备及上转换发光性能

YF_3∶Yb,Er,Tm nanocrystal:low-temperature solid-state synthesis and upconversion luminescence property

采用低温固相法制备了镱离子(Yb^(3+))、铒离子(Er^(3+))、铥离子(Tm^(3+))共掺杂的氟化钇(YF3)纳米晶,研究了煅烧温度及时间对样品微结构和发光性能的影响。结果表明:煅烧温度对YF3纳米晶的晶相结构、形貌进而发光性能具有重要的影响。随着煅烧温度的上升,样品晶化完全,可获得纯正交相的YF3纳米晶,样品颗粒变大,发光强度增大,但过高的煅烧温度会使样品产生杂相,颗粒急剧增大,发光强度反而降低。在相同的煅烧温度下,煅烧时间对样品的微结构和发光性能的影响甚微。在980nm红外光激发下,样品的可见光发射由478nm的蓝光带、548nm的绿光带及657nm的红光带组成。通过样品发光强度与激发功率的关系,分析了其可能的上转换发光机制。

YF3 ： Yb,Er,Tm nanocrystals was synthesized by low-temperature solid-reaction method, and the influ- ences of calcination temperature and calcination time on the microstructures and luminescence properties of samples were investigated. The results showed that the calcination temperature had significant effect on the crystal phase structure,mor- phology and luminescence properties of obtained YF3 nanocrystals. The crystallization of samples was complete, and pure orthorhombic phase YF3 nanocrystals can be obtained, and the grain size and emission intensity of samples increased with the increasing of calcination temperature. Whereas when the calcination temperature was too high, the impure phase ap- peared in the obtained crystals, the grain size significantly increased and the emission intensity decreased. At the same calci- nation temperature,the calcination time had little effect on the microstructure and luminescence properties of samples. Being pumped under 980nm infrared laser, the visible light emission of YF3 ： Yb, Er, Tm nanocrystals was composed of 478nm blue light band,548nm green light band and 657nm red light band. The possible upconversion mechanism of YF3 ：Yb,Er, Tm nanocrystals was proposed by investigating the relationship between the emission intensity and the exciting power.