Optical properties of B2O3–CaF2 glass-ceramics doped with silver nanoparticles and praseodymium ions
We report on the synthesis and optical experiments with borate glass-ceramics (B2O3–CaF2 glass enclosing CaF2 nanocrystals), either undoped or doped with praseodymium ions (Pr3+) and containing silver nanoparticles (Ag-NPs). The techniques of transmission electron microscopy, X-rays diffraction, lin...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/206424 |
| Acceso en línea: | http://dx.doi.org/10.1016/j.jlumin.2021.118225 http://hdl.handle.net/11449/206424 |
| Access Level: | acceso abierto |
| Palabra clave: | B2O3–CaF2 glasses Borate glass-ceramics CaF2 nanocrystals Pr3+ions Silver nanoparticles |
| Sumario: | We report on the synthesis and optical experiments with borate glass-ceramics (B2O3–CaF2 glass enclosing CaF2 nanocrystals), either undoped or doped with praseodymium ions (Pr3+) and containing silver nanoparticles (Ag-NPs). The techniques of transmission electron microscopy, X-rays diffraction, linear optical absorption, and photoluminescence (PL), were used to characterize the samples prepared. The glass samples, prepared by using the diffusion method, were heat-treated for nucleation of CaF2 nanocrystals (CaF2–NCs) with cubic structure and dimensions of ~20 nm, and Ag-NPs (with sizes between ~2 and ~50 nm). Optical absorption and PL experiments were performed. The glass-ceramic with Ag-NPs, but without Pr3+, exhibited tenfold enhancement (~1000%) of the blue PL from the CaF2–NCs, in comparison with the samples without Ag-NPs. In the samples with Pr3+ the presence of Ag-NPs induced small enhancement of the absorption spectra in the blue region [Pr3+ transitions: 3H4→3PJ (J = 0, 1, 2), 1I6] and 75% increase of the emitted intensity in the red region (Pr3+ transitions: 1D2→3H4). On the other hand, the CaF2–NCs luminescence was totally quenched due to the presence of Pr3+. This effect was attributed to resonant energy-transfer from the CaF2–NCs to Pr3+. The phenomena observed in the experiments were understood considering the contributions of the local electric field in the vicinities of the Ag-NPs and processes of energy-transfer among the CaF2–NCs, Ag-NPs and Pr3+. |
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