Fluorescence line narrowing and Judd-Ofelt theory analyses of Eu3+-doped low-silica calcium aluminosilicate glass and glass-ceramic
| Autor: | M. Sandrini, N.B. Aranda, Jurandir H. Rohling, V. S. Zanuto, A.N. Medina, Yannick Guyot, Mauro Luciano Baesso, Dominique de Ligny, Robson Ferrari Muniz |
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| Rok vydání: | 2018 |
| Předmět: |
Glass-ceramic
Materials science Biophysics Analytical chemistry Calcium aluminosilicate 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences law.invention chemistry.chemical_compound chemistry law Quantum efficiency Stimulated emission Emission spectrum Crystallization 0210 nano-technology Spectroscopy Excitation |
| Zdroj: | Journal of Luminescence. 201:123-128 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.04.027 |
| Popis: | Eu-doped calcium aluminosilicate glass and glass-ceramic were synthesized and studied by site-selective spectroscopy. Using both broadband excitation and fluorescence line narrowing techniques, the D 0 5 → F 1 7 emission transition was studied under resonant excitation at different wavelengths within the F 0 7 → D 0 5 band. In order to explore the local structure of the systems, crystal-field analysis was applied assuming C 2 v site symmetry. Moreover, from the emission spectra of glass and glass-ceramic systems, Judd-Ofelt parameters Ω t (t = 2, 4) were considered. Transition probability (A), stimulated emission cross-section ( σ ), radiative lifetime ( τ R ) and branching ratios ( β ) due to the transition D 0 5 → F J 7 (J = 1, 2, 3 and 4) of Eu 3 + ions were evaluated in different local fields and their relative variations were discussed. The crystallization process, which converted the glass into glass-ceramic, promoted an important enhancement in the quantum efficiency, which was improved from 45% to 60%. |
| Databáze: | OpenAIRE |
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