Synthesis and Upconversion Luminescence of YF3:Yb3+,Tm3+ and TiO2-Coated YF3:Yb3+,Tm3+ Microcrystals
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 1I6 → 3H6, 1I6 → 3F4, 1D2 → 3H6, 1D2 → 3F4, 1G4 → 3H6, and 1G4 → 3F4 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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