Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 8, Pages 11132-11136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.01.133
Keywords
Nanocrystals; Stark-splitting process; Temperature-dependent spectra; Judd-Ofelt theory
Categories
Funding
- National Science Foundation of China [11604262]
- Shaanxi Provincial Research Plan for Young Scientific and Technological New Stars [2015KJXX-40]
- New Star Team of Xi'an University of Posts AMP
- Telecommunications
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM1052, 2018JQ1070]
- Natural Science Foundation of Shaanxi Provincial Department of Education [18JK0712]
- Open Research Fund of Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences [LSIT201810D]
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In this paper, we fabricated NaYF4: Eu3+ nanocrystals via a facile hydrothermal approach. By a technique of in situ optical spectroscopy, the luminescence kinetics of the NaYF4: Eu3+ nanocrystals were real-time monitored by a confocal optical microscopy system. It is discovered that the most intense emission peak of Eu3+ ions is at 615 nm (D-5(0) -> F-7(2)) that belongs to the electric dipole (ED) transition and its intensity is sensitive to the crystal environment. The D-5(0) -> F-7(2) emission band could appear obvious stark-splitting phenomenon during the heat process of the nanocrystals at 1000 degrees C. The luminescence mechanism of NaYF4: Eu3+ nanocrystals is analyzed by Judd-Ofelt theory. The special spectroscopic properties of NaYF4: Eu3+ nanocrystals at high temperature could have an impact on the optical properties of trivalent lanthanide ion doped fluoride materials and associated applications. Furthermore, this finding may serve as a promising and powerful technique to better investigate the PL mechanism.
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