Influence of yttrium ions on the emission transfer features of Ce³⁺/Yb³⁺ co-doped lithium silicate glasses

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• 作者：N.Ch. Ramesh Babu^a ; Ch. Srinivasa Rao^b ; G. Naga Raju^a ; V. Ravi Kumar^a ; I.V. Kityk^c ; N. Veeraiah^a ; ^{nvr8@rediffmail.com}
• 关键词：Li2O&minus ; Y2O3&minus ; SiO2 glass system ; Ce3+ and Yb3+ ions ; Photoluminescence spectra ; Energy transfer
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：June, 2012
• 卷：34
• 期：8
• 页码：1381-1388
• 文件大小：792 K

摘要

Optical absorption and photoluminescence spectra (PL) of the glasses possessing compositions (49 鈭?#xA0;x) Li₂O鈭?em>x Y₂O₃鈭?0 SiO₂:1.0 Ce₂O₃/1.0Yb₂O₃ and (49 鈭?#xA0;x) Li₂O鈭?em>x Y₂O₃鈭?0 SiO₂:(0.5 Ce₂O₃ + 0.5 Yb₂O₃) with x varying from 5 to 15 mol%were studied. The PL spectra of Ce³⁺ doped glasses excited at 360 nm exhibited two broad parity allowed 5d(²D) 鈫?#xA0;4f(²F_5/2,_7/2) bands in the blue spectral region, whereas the spectra of Yb³⁺ doped glasses excited at 900 nm exhibited a broad emission band centered at about 980 nm due to ²F_5/2 鈫?#xA0;²F_7/2 transition. A significant enhancement in the intensity of NIR emission is observed due to the sensitization with Ce³⁺ ions. The increase in the rate of energy transfer from Ce³⁺ to Yb³⁺ could be observed with increasing Y₂O₃ content. The reasons for such improvement have been discussed within a framework of structural modifications taking place in the vicinity of Yb³⁺ ions.