Physics Department and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligent Systems , Huaiyin Normal University , 111 West Chang Jiang Road , Huai'an 223001 , China.
Inorg Chem. 2018 May 7;57(9):5038-5047. doi: 10.1021/acs.inorgchem.8b00102. Epub 2018 Apr 17.
Upconversion (UC) based luminescent materials have promising applications in noncontact temperature sensors. How to improve the sensitivity is one main object at present. This work presented several strategies for optical temperature sensing based on UC spectra of the YWO:Yb-Er/Ho/Tm phosphors. The improvement for the relative ( S) and absolute ( S) sensitivities were discussed by using a fluorescence intensity ratio technique. It includes thermally coupled levels (TCLs) and non-TCLs. It was proposed that a piecewise expression could be employed to achieve high S value for TCLs. However, improving the S value is limited for TCLs. With regard to the non-TCLs, S and S are not restricted, but not easy to be improved synchronously. On the other hand, the morphology and UC spectra of the samples were also studied. The above investigation could be instructive to develop new luminescent materials with high sensitivity.
上转换（UC）发光材料在非接触式温度传感器中有很有前景的应用。如何提高其灵敏度是目前的主要目标之一。本工作提出了几种基于 YWO:Yb-Er/Ho/Tm 荧光粉的 UC 光谱的光学温度传感策略。通过荧光强度比技术讨论了相对（S）和绝对（S）灵敏度的提高。这包括热耦合能级（TCLs）和非 TCLs。提出可以采用分段表达式来实现 TCLs 的高 S 值。然而，对于 TCLs，提高 S 值是有限的。对于非 TCLs，S 和 S 不受限制，但不容易同时得到改善。另一方面，还研究了样品的形貌和 UC 光谱。上述研究对于开发具有高灵敏度的新型发光材料具有指导意义。
