Wydział Chemii

Damian Szymański

Marcin Sobczyk

2016

Journal of Luminescence

173

11-18

10.1016/j.jlumin.2015.12.023

Naukowa

Angielski

Artykuł

In this paper, the optical properties of Y₂Te₄O₁₁microcrystalline powders doped with Dy³⁺ions, ranging between 0.01 and 5.0at%, are reported. The powders were successfully synthesized by the solid state reaction method. Absorption (300K), excitation (300K) and fluorescence spectra (at 11.6 and 300K) as well as fluorescence decay curves recorded at room temperature are presented and analyzed in details. Oscillator strengths, phenomenologicalΩ_λ(λ=2, 4, 6) Judd-Ofelt parameters, radiative transition probabilities, branching ratios, the radiative lifetime of the⁴F_9/2level as well as the stimulated emission cross-section for the⁴F_9/2→⁶H_13/2transition have been determined. The observed non-exponential decay nature and concentration quenching of the⁴F_9/2emitting level of the Dy³⁺ion, have been attributed to cross-relaxation processes. The high value of the stimulated emission cross-section for the⁴F_9/2→⁶H_13/2transition at 576.6nm, equal to 0.756×10⁻²⁰cm², indicates that Y₂Te₄O₁₁activated by trivalent dysprosium ions is an attractive candidate for a solid-sate laser.

oxotellurates, Dy3+ ion, luminescence, Emission cross section, laser materials

http://dx.doi.org/10.1016/j.jlumin.2015.12.023

http://www.elsevier.com