کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398669 | 1505890 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of Er3+ ion concentration on spectroscopic properties and luminescence behavior in Er3+ doped Strontium telluroborate glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
Er3+ doped Strontium telluroborate glasses were prepared following melt quenching technique by varying the concentration of Er3+ ion with respect to Borate content as 0.01, 0.05, 0.1, 0.5, 1.0 and 2.0 mol%. The presence of different vibrational groups was identified through FTIR and Raman spectral measurements. The variation in JO parameters with the increase in Er3+ ions concentration was discussed with respect to the covalency of the prepared glasses. The direct and indirect band gap values were found to decrease with the increase in Er3+ ion content and are discussed in terms of metallization factor and non-bridging oxygens. The green luminescence corresponding to the thermally coupled 2H11/2 and 4S3/2 states under 379 nm and 980 nm excitations was discussed. The luminescence intensity quenches beyond 0.5 mol% of Er3+ ion concentration in both the excitations due to the energy transfer process which takes place between Er3+ and Er3+ ions. The different possible mechanisms (ESA, ETU) responsible for the upconversion luminescence were also discussed with partial energy level diagram. The radiative parameters such as A, β and Ï were determined for the 4S3/2 excited level which in turn helps one to calculate the stimulated emission cross-section (ÏPE). Among the studied glasses, STB0.5E glass exhibits higher A,ÏpE and βR values and these in turn specify its suitability for laser applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 171, March 2016, Pages 19-26
Journal: Journal of Luminescence - Volume 171, March 2016, Pages 19-26
نویسندگان
K. Annapoorani, N. Suriya Murthy, T.R. Ravindran, K. Marimuthu,