Wang Yubin, Lei Lei, Ye Renguang, Jia Guohua, Hua Youjie, Deng Degang, Xu Shiqing
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China.
Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
ACS Appl Mater Interfaces. 2021 May 26;13(20):23951-23959. doi: 10.1021/acsami.1c05611. Epub 2021 May 11.
Fluorescence intensity ratio-based temperature sensing with a self-referencing characteristic is highly demanded for reliable and accurate sensing. Although enormous efforts have been devoted to explore high-performance luminescent temperature probes, it remains a daunting challenge to achieve highly relative sensitivity which determines temperature resolution. Herein, we employ a novel strategy to achieve temperature probes with ultrahigh relative sensitivity through integrating both positive and negative thermal quenching effect into a hydrogel. Specifically, Er ions show evidently a positive thermal quenching effect in Yb/Er:NaYF@NaYF nanocrystals while Nd and Tm ions in a YbWO bulk exhibit prominently a negative thermal quenching effect. With elevating temperature from 313 to 553 K, the fluorescence intensity ratio of Er (540 nm) to Nd (799 nm) and Tm (796 nm) to Er (540 nm) is significantly decreased about 1654 times and increased about 14,422 times, respectively. The maximum relative sensitivity of 15.3% K at 553 K and 23.84% K at 380 K are achieved. The strategy developed in this work sheds light on highly sensitive probes using lanthanide ion-doped materials.
基于荧光强度比且具有自参考特性的温度传感对于可靠且准确的传感具有很高的要求。尽管人们已经付出了巨大努力来探索高性能的发光温度探针，但要实现决定温度分辨率的高相对灵敏度仍然是一项艰巨的挑战。在此，我们采用一种新颖的策略，通过将正热猝灭效应和负热猝灭效应整合到水凝胶中来实现具有超高相对灵敏度的温度探针。具体而言，在Yb/Er:NaYF@NaYF纳米晶体中，Er离子明显表现出正热猝灭效应，而在YbWO块体中，Nd和Tm离子则显著表现出负热猝灭效应。随着温度从313 K升高到553 K，Er（540 nm）与Nd（799 nm）以及Tm（796 nm）与Er（540 nm）的荧光强度比分别显著降低约1654倍和增加约14422倍。在553 K时实现了15.3% K的最大相对灵敏度，在380 K时实现了23.84% K的最大相对灵敏度。这项工作中开发的策略为使用镧系离子掺杂材料的高灵敏度探针提供了思路。
