کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400443 | 1505917 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence and electron paramagnetic resonance investigation on ultraviolet emitting Gd doped MgAl2O4 phosphors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Phosphor powders of Gd doped MgAl2O4 have been prepared by a simple combustion route in a short time of 5Â min. Powder X-ray diffraction, scanning electron microscope and energy dispersive analysis of X-ray techniques were used to characterize the as-prepared combustion product. The luminescence of Gd3+ doped MgAl2O4 shows two emission bands centered at 306Â nm (6P5/2â8S7/2) and 312Â nm (6P7/2â8S7/2), under UV light excitation (273Â nm). Electron Paramagnetic Resonance (EPR) spectra reveal the U spectrum which is typical for Gd3+ ions disposed in tetrahedral, octahedral or cubic symmetry with moderate distortion. The number of spins, Gibbs energy, magnetic susceptibility, Curie constant and effective magnetic moment values are determined at 110 and 296Â K. The linewidth is found to increase with the decrease of temperature and this has been attributed to spin-spin interaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 143, November 2013, Pages 162-168
Journal: Journal of Luminescence - Volume 143, November 2013, Pages 162-168
نویسندگان
Vijay Singh, G. Sivaramaiah, J.L. Rao, S.H. Kim,