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- Title
Construction of self-sensitized LiErF<sub>4</sub>: 0.5% Tm<sup>3+</sup>@LiYF<sub>4</sub> upconversion nanoprobe for trace water sensing.
- Authors
Zhang, Ling; Li, Xiaodan; Wang, Wang; Zhao, Xu; Yan, Xu; Wang, Chenguang; Bao, Haoqiang; Lu, Yang; Kong, Xianggui; Liu, Fengmin; Liu, Xiaomin; Lu, Geyu
- Abstract
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 Er3+ 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 recyclability, offering them suitable for real-time and long-term water monitoring.
- Publication
Nano Research, 2020, Vol 13, Issue 10, p2803
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-020-2932-4