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Closed Access item Effect of concentration on the infrared emissions of Tm3+ ions in lead niobium germanate glasses

Authors:Balda, Rolindes
Fernández, J.
Arriandiaga, M. A.
Lacha, L. M.
Fernández Navarro, José María
Issue Date:2006
Citation:Optical Materials 28: 1253- 1257 (2006)
Abstract:In this work, we have studied the effect of concentration on the 3H4 → 3F4 and 3F4 → 3H6 emissions of Tm3+-doped lead-niobium-germanate glasses (GeO2-PbO-Nb2O5) for different Tm3+ concentrations (0.1, 0.2, 0.5, 1, 2, and 3 wt%) and at different temperatures between 10 K and 295 K. The emission spectra obtained under 798 nm excitation reveal the existence of energy transfer via cross-relaxation among Tm3+. As a result, the intensity of the infrared 3H4 → 3F4 emission at 1474 nm decreases in relation to that of emission at 1820 nm, as concentration increases. The non-exponential character of the decays from the 3H4 level with increasing concentration, together with the dependence of the quenching rate on Tm3+ concentration, indicate the presence of a dipole-dipole quenching process in the framework of a diffusion-limited regime. The self-quenching of the 3F4 → 3H6 emission at 1820 nm can be attributed to limited diffusion within the active centers. © 2006 Elsevier B.V. All rights reserved.
Identifiers:doi: 10.1016/j.optmat.2005.11.033
issn: 0925-3467
Appears in Collections:(CFMAC-IO) Artículos

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