YVO_(4)∶Yb^(3+)/Tm^(3+)/Er^(3+)上转换材料发光特性与温敏特性研究

Luminescence and temperature sensing properties of YVO_(4)∶Yb^(3+)/Tm^(3+)/Er^(3+)up-conversion materials

基于非热耦合能级荧光强度比(NTCL-FIR)技术能够极大地提升测温灵敏度,但是采用多项式拟合基于NTCL-FIR数据时,难以给出准确的拟合公式,对于灵敏度的计算将产生较大的误差。通过简单的高温固相法合成了YVO_(4)∶Yb^(3+)/Tm^(3+)/Er^(3+)上转换材料,对样品的结构和形貌进行表征。荧光光谱表明,所制备的材料呈现蓝光(477nm)、绿光(528nm和552nm)和近红外光(801nm)发射,采用色度坐标和相关色温标定样品的发光颜色,并对其发光机制进行分析。通过程序准确地拟合FIR(I_(528)/I_(477))数据点,并获得其拟合公式。最后,对比基于NTCL-FIR和热耦合能级荧光强度比(TCL-FIR)的测温灵敏度发现,基于NTCL-FIR的绝对灵敏度(0.0290@320K)和相对灵敏度(1.506@316K)度均优于基于TCL-FIR的绝对灵敏度和相对灵敏度。综上所述,YVO_(4)∶Yb^(3+)/Tm^(3+)/Er^(3+)上转换材料在温度传感领域表现出较大的潜力。

The fluorescence intensity ratio technology based on the non-thermally coupled levels can greatly improve the temperature sensitivity,but the experimental spots are not well defined by polynomial fit,thus the calculation of sensitivity will produce a large error.YVO_(4)∶Yb^(3+)/Tm^(3+)/Er^(3+)up-conversion material was synthesized by simple solid-state method,then the structure and morphology of the samples were characterized respectively.Fluorescence spectra indicated that it presented blue light(477nm),green light(528nm and 552nm)and near-infrared light(801nm)emission under 980nm excitation.Next,using the chromaticity coordinates and related color temperature calibration measured the light color of samples,and its luminescence mechanism was analyzed.The FIR(I_(528)/I_(477))fitting formula was accurately obtained by means of a program.Finally,comparing the temperature sensitivity based on NTCL-FIR with TCL-FIR,it was found that the absolute sensitivity and relative sensitivity based on NTCL-FIR were 0.0290@320K and 1.506@316K,respectively,which were better than that of based on TCL-FIR.In summary,Yb^(3+)/Tm^(3+)/Er^(3+)co-doped YVO_(4) up-conversion material exhibited great potential for temperature probing.