Emission spectra of zinc oxychloride tellurite glass: effects of Eu 3+/Sm3+ Co-doping

Abstract

Eu3+ or/and Sm3+ co-doped glasses based on TeO 2-ZnO-ZnCl2-Li2O are prepared using the melt quenching technique and the effects of co-doping on the emission spectra of these glasses are examined. The Sm3+ doped glass under 403 nm excitations show emission bands around 561, 598 and 642 nm corresponding to the transitions of 4G5/2 →;6H5/2, 4G 5/26H0 and 4G→ OH9/2 respectively. Whereas, in Eu3+ doped glass under 397 nm excitation emission bands appear around 553, 586, 613, 650 and 699 nm that corresponds to the transitions of 5D1→ F2, 5D0 → 7F1, 5D0 → IF2, 5D0→ 7F3 and 5D0→ 7F 4. In addition, the emission spectra of the Eu3+/Sm 3+ co-doped glass under 482 nm excitation consists of five bands in which three are contributed by Sm3+ at 561, 598 and 642 nm and two by Eu3+ at 613 nm and 699 nm respectively. Surprisingly, the emission bands of Eu3+ are still observed in the emission spectra of Sm 3+ for the Eu3+/Sm3+ co-doped glasses despite the absence of the excitation wavelength 482 nm in the absorption and excitation domain of Eu3+. This observation is attributed to the partial resonance transfer of the absorption energy from Sm3+ to the Eu 3+ ions