کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1314451 | 975967 | 2009 | 4 صفحه PDF | دانلود رایگان |
A facile hydrothermal method is used for the preparation of Tm3+/Yb3+ codoped fluoride microphosphors. The effect of crystal structure and ions concentration on the spectra and lifetimes of the radiative levels of Tm3+ ions in the different fluoride microcrystals is studied in detail. XRD analysis of Tm3+/Yb3+ codoped LaF3 microcrystals shows that 20% Yb3+ doping is sufficient for hexagonal LaF3 microparticles to crystallize completely in the orthorhombic phase. And lifetime analysis suggests that the average lifetimes of the radiative levels of Tm3+ ions increased when the matrix phase structure changing from orthorhombic phase to hexagonal phase with ytterbium dopant concentration changing.
XRD patterns of samples (a) LaF3:10Yb3+, 0.5Tm3+; LaF3:20Yb3+, 0.5Tm3+; (b) YF3:10Yb3+, 0.5Tm3+ MCs annealed at 600 °C.Figure optionsDownload as PowerPoint slide
Journal: Journal of Fluorine Chemistry - Volume 130, Issue 11, November 2009, Pages 1059–1062