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|Title:||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|
|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.|
|Appears in Collections:||(CFMAC-IO) Artículos|
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