Effect of fluoride ions on the optical properties of Eu 3+ :PbF 2 nanocrystals embedded into sol–gel host materials
| Autor: | Rozalia Czoik, Wojciech A. Pisarski, Natalia Pawlik, Tomasz Goryczka, Barbara Szpikowska-Sroka, Lidia Żur |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry Mineralogy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material 0104 chemical sciences Ion chemistry.chemical_compound chemistry Atomic electron transition Excited state General Materials Science 0210 nano-technology Luminescence Spectroscopy Fluoride Sol-gel |
| Zdroj: | Materials Chemistry and Physics. 174:138-142 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2016.02.060 |
| Popis: | In this research, the effects of fluoride ions concentration on luminescence properties of Eu3+:PbF2 nanocrystals in silicate sol–gel materials have been investigated. Optical and structural properties of Eu3+:PbF2 nanocrystals have been examined using X-ray diffraction analysis (XRD) and luminescence spectroscopy. Formation of the cubic β-PbF2 nanocrystalline phase was confirmed. The crystal size was estimated using Scherrer's equation and Williamson-Hall formula. The optical behavior of Eu3+ ions in studied materials is strongly dependent on amount of incorporated fluorides in the host lattice and the optimal concentration about 3.0 mass. % give the more intense emission of Eu3+. The luminescence spectra showed the characteristic orange-red emission due to the 5D0 → 7F1 and 5D0 → 7F2 electron transitions, respectively. The luminescence intensity ratio R (I(5D0 → 7F2)/I(5D0 → 7F1)) and luminescence lifetimes for the 5D0 excited state of Eu3+ ions were determined for each sample before and after heat treatment process. Obtained results indicate the partially incorporation of Eu3+ ions into β-PbF2 nanocrystalline phase during ceramization process. |
| Databáze: | OpenAIRE |
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