Influence of yttrium ions on the emission transfer features of Ce3+/Yb3+ co-doped lithium silicate glasses
2012; Elsevier BV; Volume: 34; Issue: 8 Linguagem: Inglês
10.1016/j.optmat.2012.02.024
ISSN1873-1252
AutoresN. Ch. Ramesh Babu, Ch. Srinivasa Rao, G. Naga Raju, V. Ravi Kumar, I.V. Kityk, N. Veeraiah,
Tópico(s)Solid State Laser Technologies
ResumoOptical 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 15 mol% were studied. The PL spectra of Ce3+ doped glasses excited at 360 nm 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 900 nm exhibited a broad emission band centered at about 980 nm 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.
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