Wydział Chemii

Marcin Sobczyk

2015

Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy

149

965-970

10.1016/j.saa.2015.05.034

Naukowa

Angielski

Artykuł

Telluride glasses with the composition xSm₂O₃–(7−x)La₂O₃–3Na₂O–25ZnO–65TeO₂ (where x = 0.1, 1, 2, 5 and 7 mol%) were obtained by the melt quenching technique. Electronic absorption and fluorescence spectra as well as fluorescence dynamics of the Sm³⁺-doped title glasses are presented and analysed in detail. A Judd–Ofelt intensity analysis of the absorption spectrum at 300 K has been applied for determination of Ω_λ parameters (Ω₂ = 3.10, Ω₄ = 3.80, Ω₆ = 1.61 × 10⁻²⁰ cm²) which in turn have been used for calculations of the radiative transition probabilities (A_T), the natural (radiative) lifetimes (τ_R) of the ⁴G_5/2 level of Sm³⁺, the fluorescence branching ratios (β) and the emission cross-sections (σ_em). The τ_R value of the ⁴G_5/2 level amount to 1546 μs and is slightly higher than the measured decay time of 1306 μs. With the increasing of Sm₂O₃ concentration from 0.1 to 7.0 mol% the experimental lifetime of the fluorescent level decreases from 1306 to 41 μs. An analysis of the non-radiative decay was based on the cross-relaxation mechanisms. The optical achieved results indicate that the investigated glasses are potentially applicable as an orange and/or red laser host.

sm3+, Telluride glasses, Judd–Ofelt theory, laser materials, optical properties

http://dx.doi.org/10.1016/j.saa.2015.05.034

http://www.elsevier.com