Construction of self-sensitized LiErF4: 0.5%Tm3+@LiYF4 upconversion nanoprobe for trace water sensing

作者:Ling Zhang; Xiaodan Li; Wang Wang; Xu Zhao; Xu Yan; Chenguang Wang; Haoqiang Bao; Yang Lu; Xianggui Kong; Fengmin Liu; Xiaomin Liu; Geyu Lu
来源:Nano Research, 2020, 13(10): 2803-2811.

摘要

LiErF4 was commonly used as a dipolar-coupled antiferromagnet,and was rarely considered as a luminescent material.Herein,we achieved the strong red upconversion emission of LiErF4 simply by an inert shell coating,i.e.,LiErF4@LiYF4.Owing to the unique and intrinsic ladder-like energy levels of EP ions,this LiErF4 core-shell nanostructures present red emission (~ 650 nm) under multi-band excitation in the near-infrared (NIR) region (~ 808,~ 980,and ~ 1,530 nm).A brighter and monochromic red emission can be further obtained via doping 0.5% Tm3+ into the LiErF4 core,i.e.,LiErF4∶ 0.5% Tm3+@LiYF4.The enriched Er3+ ions and strong monochromic red emission natures make LiErF4∶ 0.5% Tm3+@LiYF4 nanocrystals very sensitive for trace water probing in organic solvents with detection limit of 30 ppm in acetonitrile,50 ppm in dimethyl sulfoxide (DMSO),and 58 ppm in N,N-dimethylformamide (DMF) under excitation of 808 nm.Due to their superior chemical and physical stability,these nanoprobes exhibit excellent antijamming ability and recydability,offering them suitable for real-time and long-term water monitoring.

  • 单位
    集成光电子学国家重点实验室; 发光学及应用国家重点实验室

全文