کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403415 | 1392758 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Tb doping on the photoluminescence of Y2O3:Tb nanophosphors
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of Tb doping on the photoluminescence (PL) of Y2O3:Tb nanophosphors have been investigated. Nanophosphors were prepared by the glycine-nitrate solution combustion technique using yttria and terbia powders as precursors. PL excitation spectra at room temperature consist of two overlapping bands centered at 277 and 304Â nm, whereas emission spectra comprise several groups of lines corresponding to the 5D4â7FJ (J=1-6) 4f electronic transitions of the Tb+3 ions. A direct comparison of nanophosphor and bulk concentration-quenching curves was obtained by annealing the nanophosphor powder and converting it to bulk material without altering the Tb concentration. The peak in the nanophosphor concentration-quenching curve occurs at a concentration â¼3 times higher than that of the bulk.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 838-842
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 838-842
نویسندگان
R.E. Muenchausen, L.G. Jacobsohn, B.L. Bennett, E.A. McKigney, J.F. Smith, J.A. Valdez, D.W. Cooke,