Journal
JOURNAL OF LUMINESCENCE
Volume 175, Issue -, Pages 35-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2016.02.018
Keywords
Upconversion mechanisms; NaYF4; Thermal effect; Emission color
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Funding
- 111 project [B13015]
- National Natural Science Foundation of China [11204048]
- China Postdoctoral Science Foundation [2013M541340]
- Heilongjiang Postdoctoral Fund [LBH-Z13053]
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Wide range concentrations of Er3+ doped NaYF4 nanocrystals are synthesized. Upconversion mechanisms are discussed under 976 nm NIR laser excitation on the basis of the fluorescence spectra and lifetimes data of Er3+. It is found that the heat induced by incident laser results in an evident increase of the slope of emission from H-2(11/2) energy level in the pump power dependence. Emission color of samples is investigated and stable chromaticity under different pump power from low and heavy doping samples are found. In addition, upconversion mechanisms are also investigated under 966 nm excitation. (C) 2016 Elsevier B.V. All rights reserved.
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