Wydział Chemii

Damian Szymański

Marcin Sobczyk

Radosław Lisiecki

2018

Journal of Luminescence

202

354-362

10.1016/j.jlumin.2018.05.079

Naukowa

Angielski

Artykuł

The Y_2-xTe₄O₁₁ (x = 0.1, 0.5, 1.0, 2.0 and 5.0 at%) microcrystalline powders were successfully synthesized by a conventional solid state reaction method. Optical absorption (300 K) and fluorescence spectra (300 K) as well as fluorescence decay curves (300 K) of the emitting levels of Tm³⁺ ion in Y₂Te₄O₁₁ powders are presented and analyzed in details. The Judd-Ofelt theory was applied to analyze experimental data for the quantitative determination of phenomenological Ω_λ (λ = 2, 4, 6) parameters, radiative transition probabilities (A), branching ratios (β) of luminescence and radiative lifetimes (τ_rad) of the ¹D₂, ¹G₄, ³H₄ and ³F₄ levels. The observed non-exponential decays nature and concentration quenching of the ¹G₄ and ³H₄ states have been attributed to cross-relaxation processes and this phenomena has been analyzed by Inokuti-Hirayama model. The stimulated emission cross-section for the ³F₄ → ³H₆ transition equals to 1.12 × 10⁻²⁰ cm² at 1809 nm was calculated using the Füchtbauer-Ladenburg method and compared with the corresponding values of other Tm³⁺-doped laser hosts. From obtained results, follow that the Tm³⁺:Y₂Te₄O₁₁ is a potential candidate for a solid-state laser host operating at 1.8 µm.

Tm3+, oxotellurates, energy transfer, laser material

https://doi.org/10.1016/j.jlumin.2018.05.079

http://www.elsevier.com