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Comparison study on the different strategies designed for ratiometric luminescence thermometry in Er3+/Yb3+: SrMoO4 phosphor
Sensors and Actuators A: Physical ( IF 4.1 ) Pub Date : 2020-08-19 , DOI: 10.1016/j.sna.2020.112287
Xin Liu , Jiawen Wang , Ruoshan Lei , Shilong Zhao , Feifei Huang , Degang Deng , Shiqing Xu

To validate the feasibility of the strategy designed for ratiometric luminescence thermometry, the impacts of doping concentration and power density on the thermometric parameter and measurement result should be assessed but have normally been discounted. Herein, Yb3+/Er3+: SrMoO4 upconverting (UC) phosphors were prepared via a hydrothermal method. The UC luminescence spectra were composed of the strong green emission and weak red emission bands upon 980 nm excitation. The thermally coupled levels (TCLs) of Er3+: 2H11/2, 4S3/2 and the non-thermally coupled levels (non-TCLs) of Er3+: 2H11/2, 4F9/2 were selected for fluorescence intensity ratio (FIR) thermometry, while the emissions originating from 4S3/2 Stark sublevels to 4I15/2 ground level were adopted for the valley to peak ratio (VPR) thermometry. The dependences of FIR-TCL (I535/I558), FIR-non-TCL (I535/I663) and VPR (I553/I558) values on the doping concentration and pump power density were analyzed. The results showed that the FIR-non-TCL and VPR data suffered from the interferences from the fluctuations in doping concentration and power density, causing the unavoidable measuring errors and unstable thermometric performance. Such problems could be solved by utilizing the concentration-insensitive and power-insensitive FIR-TCL, which also gained the high relative sensing sensitivity with the optimal value of 1.18% K-1. This work will provide guidance on choosing the appropriate strategy for the reliable luminescence thermometry.



中文翻译:

Er 3+ / Yb 3+:SrMoO 4荧光粉按比例发光测温设计的不同策略的比较研究

为了验证设计用于比率式发光测温的策略的可行性,应评估掺杂浓度和功率密度对测温参数和测量结果的影响,但通常不予考虑。在此,通过水热法制备Yb 3+ / Er 3+:SrMoO 4上转换(UC)荧光粉。UC发光光谱由980 nm激发时的强绿色发射带和弱红色发射带组成。的热耦合水平铒(TCLs)3+2 ħ 11/24 š 3/2和Er的非热耦合电平(非TCLs)3+2选择H 11 / 2,4 F 9/2作为荧光强度比(FIR)测温法,同时采用从4 S 3/2 Stark子级到4 I 15/2地平面的发射作为谷峰比( VPR)测温法。FIR-TCL(I 535 / I 558),FIR-non-TCL(I 535 / I 663)和VPR(I 553 / I 558)的依赖性分析了关于掺杂浓度和泵浦功率密度的值。结果表明,FIR-non-TCL和VPR数据受到掺杂浓度和功率密度波动的干扰,导致不可避免的测量误差和不稳定的测温性能。利用浓度不敏感和功率不敏感的FIR-TCL可以解决这些问题,它还具有较高的相对感应灵敏度,最佳值为1.18%K -1。这项工作将为选择可靠的发光测温法的适当策略提供指导。

更新日期:2020-08-19
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