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Construction of self-sensitized LiErF4: 0.5% Tm3+@LiYF4 upconversion nanoprobe for trace water sensing.
- Source :
- Nano Research; Oct2020, Vol. 13 Issue 10, p2803-2811, 9p
- Publication Year :
- 2020
-
Abstract
- LiErF<subscript>4</subscript> 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 LiErF<subscript>4</subscript> simply by an inert shell coating, i.e., LiErF<subscript>4</subscript>@LiYF<subscript>4</subscript>. Owing to the unique and intrinsic ladder-like energy levels of Er<superscript>3+</superscript> ions, this LiErF<subscript>4</subscript> 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% Tm<superscript>3+</superscript> into the LiErF<subscript>4</subscript> core, i.e., LiErF<subscript>4</subscript>: 0.5% Tm<superscript>3+</superscript>@LiYF<subscript>4</subscript>. The enriched Er<superscript>3+</superscript> ions and strong monochromic red emission natures make LiErF<subscript>4</subscript>: 0.5% Tm<superscript>3+</superscript>@LiYF<subscript>4</subscript> 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 13
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 147250624
- Full Text :
- https://doi.org/10.1007/s12274-020-2932-4