利用Er3+光学温度传感特性研究Tm3+/Yb3+掺杂NaY(WO4)2微米球的激光辐照热效应

采用微波水热方法合成了Er³⁺/Yb³⁺及Tm³⁺/Yb³⁺两个共掺杂的绣球花状NaY（WO₄）₂微米球样品。XRD结果表明所获得的产物为纯相体心结构的NaY（WO₄）₂，利用SEM观察发现产物粒子结构为纳米片组装成的绣球花状。考虑到红外激光辐照对样品产生加热效应，采用380 nm激发下不同温度的发射光谱获得了Er³⁺/Yb³⁺共掺杂NaY（WO₄）₂微米球的温度传感特性曲线和灵敏度曲线。把Er³⁺/Yb³⁺共掺杂NaY（WO₄）₂与Tm³⁺/Yb³⁺共掺杂的NaY（WO₄）₂按质量比1：10进行混合，采用980 nm激发测量了混合物的上转换发光光谱，研究了激光持续辐照对Tm³⁺/Yb³⁺掺杂NaY（WO₄）₂样品的加热效应和Tm³⁺的¹G₄→³H₆ 跃迁发光强度随激光辐照时间的变化。实验发现980 nm激光辐照使Tm³⁺/Yb³⁺掺杂NaY（WO₄）₂样品的温度持续升高并达到某一平衡温度，Tm³⁺的蓝色上转换发光也随着激光辐照时间的延长而增强，最后达到饱和。此外，在相同条件下，Tm³⁺/Yb³⁺共掺杂样品的激光辐照热效应比Er³⁺/Yb³⁺共掺杂样品的热效应更为显著。

Laser Irradiation Induced Temperature Effect of NaY(WO4)2∶Tm3+,Yb3+ Using Er3+ as Optical Temperature Sensor

Er³⁺/Yb³⁺ codoped and Tm³⁺/Yb³⁺ codoped laurustinus shaped NaY(WO₄)₂ microspheres were prepared via microwave assisted hydrothermal reaction. The XRD patterns indicated the resultant isbody-centered phase, and the SEM images showed the obtained samples are laurustinus shaped microspheres. In order to avoid the heating effect of high power infrared laser irradiation, the temperature sensing curve and sensitivity curve were obtained by using the down-conversion spectra at different temperatures under 380 nm excitation. Furthermore, a mixture with the weight ratio 1:10 of Er³⁺/Yb³⁺ codoped NaY(WO₄)₂ to Tm³⁺/Yb³⁺ codoped NaY(WO₄)₂ was prepared, and the upconversion emission spectra upon 980 nm excitation were measured. The laser irradiation induced thermal effect and the dependence of blue upconversion luminescence intensity on the irradiation time within 40 min were studied. It was found that the sample temperature was elevated at the initial time of laser irradiation, and then reached an equilibrium temperature. Additionally, it is also confirmed that the infrared laser irradiation affects the Tm³⁺/Yb³⁺codoped sample much more obviously than Er³⁺/Yb³⁺ codoped one.