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Synthesis and Upconversion Luminescence of YF3:Yb3+,Tm3+ and TiO2-Coated YF3:Yb3+,Tm3+ Microcrystals

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YF3:Yb3+,Tm3+ microcrystals were prepared by a microemulsion method. The microcrystals were coated with TiO2 by hydrolysis of titanium n-butoxide (TBOT). Transform electron microscopy and X-ray diffraction were used to characterize the core/shell materials. The results indicated that the low TBOT/YF3 molar ratio was favorable to preparing the uniform TiO2 coatings. The upconversion luminescence properties of YF3:Yb3+,Tm3+ and TiO2-coated YF3:Yb3+,Tm3+ microcrystals were studied under 980-nm excitation. The 1I63H6, 1I63F4, 1D23H6, 1D23F4, 1G43H6, and 1G43F4 emissions were observed. The upconversion mechanisms were discussed in detail.
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Document Type: Research Article

Publication date: 2010-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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