Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 144, Issue -, Pages 157-164Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2012.08.009
Keywords
Morphologies; Growth mechanism; Upconversion emissions; Paramagnetic features
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Funding
- National High Technology Research and Development Program of China (863 Program) [2009AA03Z309]
- National Natural Science Foundation of China (NSFC) [51072065, 60908031, 60908001]
- Program for New Century Excellent Talents in University [NCET-08-0243]
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Hexagonal phase NaGdF4 microrods have been successfully synthesized via a facile hydrothermal method with ethylene diamine tetraacetic acid (EDTA) as the structure-directing agent. The additive amounts of NaF and NaNO3 as well as the reaction time have great effect on the morphology evolution of the products. A possible growth mechanism was proposed for the formation of beta-NaGdF4 microrods. Under the excitation of 980 nm near-infrared laser, bright green upconversion (UC) emissions can be readily achieved from NaGdF4:10%Yb3+,1%Er3+ microrods. In addition, the NaGdF4 microrods exhibit excellent paramagnetic features with the magnetization value of 5.02 emu/g (18 kOe) at room temperature. Both the UC luminescent and magnetic properties are closely related to the size of as-prepared products. These multifunctional beta-NaGdF4 microrods would have potential applications in the fields such as solid-state lasers, lighting, displays, and magnetic resonance imaging (MRI), and so on. (C) 2012 Elsevier B.V. All rights reserved.
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