Optical properties of B2O3?CaF2 glass-ceramics doped with silver nanoparticles and praseodymium ions

dc.creatorNaranjo, Luz Patricia
dc.creatorC. Olivera, Nath?lia Talita
dc.creatorKassab, Luciana R.P.
dc.creatorde Ara?jo, Cid B.
dc.date2022-03-29T17:53:28Z
dc.date2022-03-29T17:53:28Z
dc.date2021-06-01
dc.date.accessioned2023-08-31T19:05:39Z
dc.date.available2023-08-31T19:05:39Z
dc.identifierNaranjo, L. P., Oliveira, N. T. C., Kassab, L. R. P., & de Ara?jo, C. B. (2021). Optical properties of B2O3?CaF2 glass-ceramics doped with silver nanoparticles and praseodymium ions. Journal of Luminescence, 238 doi:10.1016/j.jlumin.2021.118225
dc.identifier0022-2313
dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0022231321003410
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8555412
dc.descriptionWe report on the synthesis and optical experiments with borate glass-ceramics (B2O3-CaF2 glass enclosing CaF2 nanocrystals), either undoped or doped with praseodymium ions (Pr??) 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 Pr??, exhibited tenfold enhancement (?1000%) of the blue PL from the CaF2-NCs, in comparison with the samples without Ag-NPs. In the samples with Pr?? the presence of Ag-NPs induced small enhancement of the absorption spectra in the blue region [Pr?? transitions: ?H4??PJ (J=0, 1, 2), ?I6] and 75% increase of the emitted intensity in the red region (Pr?? transitions: ?D2??H4). On the other hand, the CaF2-NCs luminescence was totally quenched due to the presence of Pr??. This effect was attributed to resonant energy-transfer from the CaF2-NCs to Pr??. 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 Pr??.
dc.descriptionUniversidad de Ibagu?
dc.languageen
dc.publisherJournal of Luminescence
dc.subjectPr3+ ions
dc.subjectsilver nanoprticles
dc.subjectCaF2 nanocrystals
dc.subjectB2O3-CaF2 glasses
dc.titleOptical properties of B2O3?CaF2 glass-ceramics doped with silver nanoparticles and praseodymium ions
dc.typeArticle


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