Li C, Li Y, Pun E Y B, Lin H
School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, P. R. China.
Department of Electrical Engineering and State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Hong Kong Special Administrative Region, P. R. China.
Dalton Trans. 2022 May 24;51(20):7997-8008. doi: 10.1039/d2dt00080f.
Sr(LaEr)F/polyacrylonitrile composite fibers with special pliability and excellent crystal dispersibility have been fabricated, which provide smaller size and appropriate temperature sensitivity. Up-conversion emission shows quadratic dependence of the photoluminescence intensity on pump power, confirming the participation of two photons during the excitation processes. The composite fibers, combining main and auxiliary sensing derived from green and red emissions, give fibers the ability to obtain accurate results and better reproducibility. Among them, assigning the green emission as the main indicator of non-contact temperature sensing, the absolute and relative sensitivities are 0.514% K and 0.654% K at 373 K, respectively. Furthermore, the ratio of green and red emission serves as an auxiliary monitoring parameter to calibrate the deviation, where the absolute and relative sensitivities reach 7.208% K and 0.901% K at 373 K. In general, composite fibers with excellent dual-ratiometric temperature sensing are expected to be applied in biological probes, miniature devices and accurate temperature sensors.
已制备出具有特殊柔韧性和优异晶体分散性的Sr(LaEr)F/聚丙烯腈复合纤维，其尺寸更小且具有合适的温度敏感性。上转换发射表明光致发光强度与泵浦功率呈二次依赖关系，证实了激发过程中有两个光子参与。该复合纤维结合了来自绿色和红色发射的主传感和辅助传感，使纤维能够获得准确的结果和更好的重现性。其中，将绿色发射作为非接触温度传感的主要指标，在373 K时绝对灵敏度和相对灵敏度分别为0.514% K和0.654% K。此外，绿色和红色发射的比率作为辅助监测参数来校准偏差，在373 K时绝对灵敏度和相对灵敏度分别达到7.208% K和0.901% K。总体而言，具有优异双比率温度传感性能的复合纤维有望应用于生物探针、微型器件和精确温度传感器。
