کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7907050 | 1510755 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Resonant excited UV luminescence of the Gd3+ centres in borate glasses, co-doped with Gd and Ag
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Resonant excited UV luminescence of the Gd3+ centres in borate glasses, co-doped with Gd and Ag Resonant excited UV luminescence of the Gd3+ centres in borate glasses, co-doped with Gd and Ag](/preview/png/7907050.png)
چکیده انگلیسی
The Li2B4O7:Gd, CaB4O7:Gd, LiCaBO3:Gd, and Li2B4O7:Gd, Ag glasses of high optical quality, obtained by standard technology, have been investigated by electron paramagnetic resonance (EPR) and optical spectroscopy at room temperature. The Gd impurity was added in the raw materials as Gd2O3 oxide in amounts 0.5 and 1.0â¯mol.%. The Ag impurity was introduced into the Li2B4O7 composition as AgNO3 and as highly dispersed metallic Ag in amount 2.0â¯mol.%. In all Gd-doped glasses was observed typical for glasses EPR U-spectrum of the Gd3+ (8S7/2, 4f7) ions. In the Gd-doped glasses upon the 273â¯nm excitation was observed weak UV emission line at 311â¯nm that is attributed to the 6P7/2â¯ââ¯8S7/2 intraconfiguration 4f - 4f transition of the Gd3+ ions. In the Li2B4O7:Gd, Ag glass has been observed significant (â¼100 times) increasing of peak intensity of the Gd3+ emission line at 311â¯nm in comparison with this line in CaB4O7:Gd glass. In luminescence excitation spectra of the CaB4O7:Gd and Li2B4O7:Gd, Ag glasses are observed characteristic groups of lines corresponding to the 8S7/2 â 6IJ, 6DJ transitions of the Gd3+ ions. Significant increasing of the Gd3+ emission line at 311â¯nm in the Li2B4O7:Gd, Ag glass is explained by energy transfer from Ag+ (4d10) to Gd3+ (4f7) upon 273â¯nm excitation that is resonant for 4d10 â 4d9 5s1 (1S0 â 1D2) and 8S7/2 â 6IJ transitions of the Ag+ and Gd3+ ions. Luminescence kinetics of the Gd3+ and Ag+ centres was investigated and analysed. Obtained results show that the borate glasses, co-activated by Gd3+ and Ag+, can be promising materials for effective UVB light sources for biomedical applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 79, May 2018, Pages 302-309
Journal: Optical Materials - Volume 79, May 2018, Pages 302-309
نویسندگان
B.V. Padlyak, A. Drzewiecki, T.B. Padlyak, V.T. Adamiv, I.M. Teslyuk,