文献类型：期刊文献

英文题名：Wide-range optical thermometry enabled by thermal quenching suppression in highly Er3?-doped NaYbF?@NaYF? core–shell nanoparticles

作者：Chen, Jingyang[1]; Xiao, Weitong[1,2]; Turyanska, Lyudmila[2]; Wu, Yiting[1]; Luan, Weiling[1]

机构：[1] CPCIF Key Laboratory of Advanced Battery Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Centre for Additive Manufacturing, Faculty of Engineering, University of Nottingham, Jubilee Campus, Nottingham, NG8 1BB, United Kingdom

年份：2025

卷号：1039

外文期刊名：Journal of Alloys and Compounds

收录：EI(收录号：20253519069206)

语种：英文

外文关键词：Chlorine compounds - Core shell nanoparticles - Erbium compounds - Fluorescence quenching - Shells (structures) - Sodium compounds - Temperature measurement - Temperature sensors - Ytterbium compounds - Yttrium compounds

摘要：Moderate suppression of thermal quenching of upconversion nanoparticles (UCNPs) can ensure sufficient temperature thermal response over a wider measurement range, which is key to reliable optical temperature measurement performance. Herein, we report a strategy for synthesis of β-NaYbF4 UCNPs, to achieve both high Er3? doping concentration and epitaxial NaYF4 inert shell to enhance thermoresponsive upconversion luminescence (UCL). With optimised ligand ratio, shell thickness, and Er3+ concentration, we achieved a 24-fold enhancement in red emission and a 4-fold increase in green emission intensities. Spectroscopic analysis reveals that high Er3+ content strengthens cross-relaxation transitions, while the inert shell suppresses surface quenching, collectively mitigating nonradiative losses. As a result, these core-shell UCNPs exhibits a high relative sensitivity (SR) of 2.7 % K?1 and a temperature resolution (δT) of 0.18 K at 200 K across a wide operational range from 200 K to 500 K. Furthermore, we demonstrate precise thermal sensing capability under both low- and high-temperature conditions with high signal stability and reproducibility. This work offers an effective strategy for tailoring the optical response of UCNPs and provides a general design framework for high-performance nanothermometers suitable for both cryogenic and wide-range thermal environments. ? 2025