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

• Published in: Optical materials Vol. 34; no. 8; pp. 1381 - 1388
• Main Authors: Ramesh Babu, N.Ch, Srinivasa Rao, Ch, Naga Raju, G., Ravi Kumar, V., Kityk, I.V., Veeraiah, N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-06-2012
• Subjects: Band spectra; Ce3+ and Yb3+ ions; Emission; Energy transfer; Excitation spectra; Glass; Li2O−Y2O3−SiO2 glass system; Photoluminescence spectra; Silicates; Silicon dioxide; Spectra; Spectral emissivity; Photoluminescence spectra; Li2O−Y2O3−SiO2 glass system; Energy transfer; Ce3+ and Yb3+ ions
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2012.02.024

An enhancement due to co-doping with Ce3+ ions in the intensity of NIR emission band of Yb3+ ions in Y2O3 mixed lithium silicate glasses is observed due to structural modifications. [Display omitted]
► Luminescence and absorption spectra of Ce3+ and Yb3+ co-doped Li2O−Y2O3−SiO2 glasses were studied. ► Enhancement in the intensity of 2F5/2→2F7/2 NIR band of Yb3+ is observed due to co-doping with Ce3+ ions. ► With the increasing Y2O3, an increase in the rate of energy transfer from Ce3+ to Yb3+ is observed.
Optical absorption and photoluminescence spectra (PL) of the glasses possessing compositions (49−x) Li2O−x Y2O3−50 SiO2:1.0 Ce2O3/1.0Yb2O3 and (49−x) Li2O−x Y2O3−50 SiO2:(0.5 Ce2O3+0.5 Yb2O3) with x varying from 5 to 15mol% were studied. The PL spectra of Ce3+ doped glasses excited at 360nm exhibited two broad parity allowed 5d(2D)→4f(2F5/2,7/2) bands in the blue spectral region, whereas the spectra of Yb3+ doped glasses excited at 900nm exhibited a broad emission band centered at about 980nm due to 2F5/2→2F7/2 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.