Journal
JOURNAL OF LUMINESCENCE
Volume 207, Issue -, Pages 361-368Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.11.041
Keywords
LiYE4 nanoparticles; Upconversion; Core/shell nanostructures; Cross relaxation
Categories
Funding
- National Natural Science Foundation of China [11604262]
- Shaanxi Provincial Research Plan for Young Scientific and Technological New Stars [2019KJXX-31]
- New Star Team of Xi'an University of Posts and Telecommunications
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM1052, 2018JQ1070]
- Open Research Fund of Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences [LSIT201810D]
- Research Plan of Xi'an University of Posts & Telecommunications [CXJJ2017001]
Ask authors/readers for more resources
The tetragonal-phased LiYF4:Yb3+/Er3+ nanoparticles with different core-shell nanostructures have been successfully synthesized by a modified solution-based method. The upconversion emissions of LiYF4:Yb3+/Er3+ nanoparticles were precisely tuned from green to red with the increase in Yb3+ concentrations under 980 nm excitation. The corresponding intensity ratios of the red and green emissions (R/G ratios) were enhanced from 0.06 to 5.33. However, the overall integral upconversion intensity of LiYF4:Yb3+/Er3+ nanoparticles clearly decreased when the Yb3+ doping concentrations were increased. For the enhancement of the red upconversion intensity and expansion of their application, two kinds of core-shell nanostructures, namely, LiYbF4:Er3+ @LiYF4 and LiYbF4:Er3+ @LiYbF4, were constructed through epitaxial growth at similar experimental conditions. The LiYbF4:Er3+ @LiYF4 core-shell nanostructures exhibited stronger upconversion emission and higher R/G ratios than the LiYbF4:Er3+ and LiYbF4:Er3+ @LiYbF4 nanoparticles. The highest R/G ratios increased to 6.27 in LiYbF4:Er3+ @LiYF4 core-shell nanostructures, increasing 104-fold. The upconversion regulation and enhancing mechanism were also discussed according to the emission spectra and fluorescence lifetimes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available