Crystal structure, infrared luminescence and magnetic properties of Tm3+-doped and Tm3+-, Dy3+-codoped BaY2Ge3O10 germanates
| Autor: | Ya. V. Baklanova, Vladimir G. Zubkov, Alexander P. Tyutyunnik, A. Yu. Chufarov, Olga A. Lipina, Ludmila L. Surat, Dina G. Kellerman |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Infrared Analytical chemistry chemistry.chemical_element Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Magnetic anisotropy Magnetization chemistry 0103 physical sciences Dysprosium Electrical and Electronic Engineering Luminescence Spectroscopy Saturation (magnetic) Monoclinic crystal system |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:14976-14989 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | The Ca(Ba)RE2Ge3O10 germanates are currently considered as a promising class of active optical media emitting in the visible and infrared spectral region. Herein, a new series of BaY2-x-yTmxDyyGe3O10 phosphors was synthesized using the solid-state reaction and characterized by X-ray diffraction, scanning electron microscopy, diffuse reflectance and luminescence spectroscopy. All the studied compounds crystallize in the monoclinic system, space group P21/m, Z = 2. Under 808 nm excitation, BaY2-xTmxGe3O10 germanates demonstrate a broad emission in 1.3–2.2 µm range owing to a series of cascade 3H4 → 3F4 and 3F4 → 3H6 transitions in Tm3+ ions. The BaY2-xTmxGe3O10 phosphors exhibit a high thermal stability over a wide temperature range and belong to promising infrared luminescence materials. The intensity of these emission bands decreases with an increase in the dysprosium content in the BaY1.97-yTm0.03DyyGe3O10 germanates. The magnetic properties measurements have been also carried out since Dy3+ ions exhibit a large magnetic anisotropy and non-collinearity of the magnetization easy axes. The magnetization curve of Tm3+-doped BaY2Ge3O10 shows the effects of saturation typical of paramagnetics, while the magnetization of germanates doped with Dy3+ ions occurs with hysteresis which is observed for single-ion magnets. |
| Databáze: | OpenAIRE |
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