کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1314974 975996 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced ultraviolet up-conversion emissions of Tm3+/Yb3+ codoped YF3 nanocrystals
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Enhanced ultraviolet up-conversion emissions of Tm3+/Yb3+ codoped YF3 nanocrystals
چکیده انگلیسی

Tm3+/Yb3+ codoped rod-like YF3 nanocrystals were synthesized through a facile hydrothermal method. After annealing in an argon atmosphere, the nanocrystals emitted bright blue and intense ultraviolet (UV) light under a 980-nm continuous wave diode laser excitation. Up-conversion emissions centered at ∼291 nm (1I6 → 3H6), ∼347 nm (1I6 → 3F4), ∼362 nm (1D2 → 3H6), ∼452 nm (1D2 → 3F4), ∼476 nm (1G4 → 3H6), ∼642 nm (1G4 → 3F4), and ∼805 nm (3H4 → 3H6) were recorded using a fluorescence spectrophotometer. Especially, enhanced UV emissions were studied by changing Yb3+/Tm3+ doping concentrations, the annealing temperatures, and the excitation power densities. A possible mechanism, energy transfer–cross relaxation–energy transfer (ET–CR–ET), was proposed based on a simple rate-equation model to elucidate the process of the enhanced UV emissions.

Tm3+/Yb3+ codoped rod-like YF3 nanocrystals were synthesized through hydrothermal method. After annealing, the nanocrystals emitted bright blue and intense ultraviolet (UV) light under 980-nm excitation. Enhanced UV emissions were studied. A mechanism of energy transfer–cross relaxation–energy transfer (ET–CR–ET) was proposed and elucidated based on a rate-equation model.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluorine Chemistry - Volume 129, Issue 3, March 2008, Pages 204–209
نویسندگان
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