Univerzita Pardubice Fakulta chemicko- technologická

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Inter-lanthanide LaYYbO3 perovskites doped with Er3+

Autoři: Suský Jakub | Šlang Stanislav | Beneš Ludvík | Wágner Tomáš | Střižík Lukáš

Rok: 2024

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Inter-lanthanide LaYYbO3 perovskites doped with Er3+	Perovskites are compounds with a general formula ABX3, capable of accommodating the crystallographic structures of most elements in the periodic table [1]. Inter-lanthanide perovskites exhibit interesting magnetic and optical properties and are also good proton conductors. The intensity of photoluminescence (PL) emission can be influenced by the composition of the host matrix and is characterized by sharp spectral peaks from their 4f electron transitions [2, 3]. The aim of this work was to prepare selected perovskites of the LaY1-xYbxO3 system (where x = 0; 0.05; 0.15; 0.25) doped with ≈0.5 at.% Er3+ ions by combustion synthesis and study of their physico-chemical properties, with a focus on optical properties. In addition to the impact of the chemical composition of perovskites on the resulting properties, the attention was paid to revealing the dependence of Yb3+ ion concentration on the mechanism of upconversion (PL) emission. The studied samples were characterized in terms of their chemical composition (EDX microanalysis), crystallites size (SEM), their crystallographic structure (XRD analysis), diffuse reflectance spectra (UV-Vis-NIR spectroscopy), and steady-state and time-resolved PL emission spectra measured at the pumping wavelength of λ ≈ 977 nm. Substitution of Yb3+ ions for Y3+ in LaY1-xYbxO3 perovskites leads to the formation of an orthorhombic perovskite structure LaYYbO3, at lower annealing temperatures with the same time of annealing the samples. In all perovskites, was observed the near-infrared Er3+: 4 I13/2 → 4 I15/2 (λ ≈ 1.56 μm) PL Stokes and the visible Er3+: 2H11/2/ 4S3/2 → 4 I15/2 (λ ≈ 520–550 nm) and Er3+: 4F9/2 → 4 I15/2 (λ ≈ 670 nm) PL anti-Stokes emission. Based on the PL emission spectra and the decay times of Er3+ electronic transitions, the mechanism of upconversion PL emission was determined. The optimal concentration of Yb3+ ions in studied perovskites was found to be ≈3 at.% in order to prevent concentratio	Inter-lanthanide; LaYYbO3; perovskites; doped; with; Er3+