Emission Spectra of Zinc Oxychloride Tellurite Glass: Effects of Eu³⁺/Sm³⁺ Co-Doping

Abstract:

Eu³⁺ or/and Sm³⁺ co-doped glasses based on TeO₂-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 ⁴G_5/2 →⁶H_5/2, ⁴G_5/2→⁶H_7/2 and ⁴G_5/2→⁶H_9/2 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→⁷F₂, ⁵D₀ →⁷F₁, ⁵D₀ →⁷F₂, ⁵D₀→⁷F₃ and ⁵D₀→⁷F₄. In addition, the emission spectra of the Eu³⁺/Sm³⁺ 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 Sm³⁺ 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 Eu³⁺ ions.

• Periodical: Solid State Phenomena (Volumes 181-182)
• Pages: 451-454
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.181-182.451
• Online since: November 2011
• Authors: M.R. Sahar, R. Arifin, S.K. Ghoshal
• Keywords: Co-Doping, Emission Spectra, Multi-Phonon, Nonradiative Relaxation, TeO₂-ZnO-ZnCl₂-Li₂O Glass System

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