کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437286 | 1509798 | 2017 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence properties of Sm3+ ions doped heavy metal oxide tellurite-tungstate-antimonate glasses
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The trivalent Sm3+ ion doped tellurium-antimony-tungsten oxides based glasses were prepared by conventional melt quenching and pressing method. Spectroscopic characterizations such as optical absorption, photoluminescence and decay profile measurements were performed on the glasses. Judd-Ofelt theory is used to evaluate the oscillator strengths and the three phenomenological intensity parameters (Ωλ, λ = 2, 4, 6) of the glasses. The photoluminescence spectra recorded under 479 nm excitation exhibited the emission bands at 562, 598, 645 and 708 nm corresponding to the transitions 4G5/2 â 6HJ (J = 5/2, 7/2, 9/2, 11/2) respectively. Using J-O parameters (Ωλ) various important radiative parameters viz., transition probabilities, emission cross-sections, branching ratios of various emission bands were evaluated. Decay profiles were recorded to find the lifetime of the 4G5/2 excited level and the obtained life time values are observed to decrease with an increase of Sm3+ ion concentration; such decrease is attributed due to clustering of Sm3+ ions which may cause luminescence quenching.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 18, 15 December 2017, Pages 16467-16473
Journal: Ceramics International - Volume 43, Issue 18, 15 December 2017, Pages 16467-16473
نویسندگان
V. Himamaheswara Rao, P. Syam Prasad, M. Mohan Babu, P. Venkateswara Rao, LuÃs F. Santos, G. Naga Raju, N. Veeraiah,