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dc.contributor.authorGorni, Giulio-
dc.contributor.authorBalda, Rolindes-
dc.contributor.authorFernández, Joaquín-
dc.contributor.authorPascual, Laura-
dc.contributor.authorPascual, M. Jesús-
dc.contributor.authorDurán, Alicia-
dc.contributor.authorPascual, M. Jesús-
dc.identifierdoi: 10.1016/j.jlumin.2017.05.063-
dc.identifierissn: 0022-2313-
dc.identifier.citationJournal of Luminescence 193: 51-60 (2018)-
dc.description.abstractEr3+-doped and Er3+-Yb3+-co-doped transparent oxyfluoride glass-ceramics (GCs) containing LaF3 nano-crystals (NCs) have been prepared by the melting-quenching method and adequate thermal treatments. A detailed structural characterization, performed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM), confirms the precipitation of LaF3 NCs with a size in the 10–15 nm range. The crystal growth is fast in the very beginning, from a few min up to 3–5 h of treatment at 620 °C and then it slows down, up to 20 h. A SiO2 enriched viscous barrier is formed around the NCs, thus preventing further crystal growth. The incorporation of Er3+ and Yb3+ ions into the NCs is proved by HR-TEM and energy dispersive X-ray spectroscopy (EDXS) analysis. Photoluminescence measurements have been performed upon visible and near infrared excitation. The energy transfer between Yb3+ and Er3+ ions is evidenced by the enhancement of the near infrared and Up-Conversion (UC) emissions of Er3+ ions in the co-doped samples under 980 nm excitation. A moderate back transfer from Er3+ to Yb3+ ions has been also observed under near infrared excitation of Er3+ ions at 800 nm. Upconverted green ((2H11/2,4S3/2) → 4I15/2) and red (4F9/2 → 4I15/2) emissions were observed in all samples and attributed to a two photon process. The strong enhancement of the UC emission for the co-doped glass-ceramics samples further confirms the incorporation of the rare-earth ions in the LaF3 NCs with a lower maximum phonon energy environment which reduces multi-phonon relaxation rates. Different red-to-green emission ratios are obtained depending on the heat treatment conditions for the glass-ceramic samples.-
dc.description.sponsorshipThis work has been supported by the Spanish Government MINECO (Project MAT2013-48246-C2-1-P and MAT2013-48246-C2-2-P) and the Basque Country University (Project PPG17/07).-
dc.subjectGlass ceramics-
dc.subjectEr3+/Yb3+ co-doping-
dc.subjectEnergy transfer-
dc.titleEffect of the heat treatment on the spectroscopic properties of Er3+-Yb3+-doped transparent oxyfluoride nano-glass-ceramics-
dc.description.versionPeer Reviewed-
dc.contributor.funderUniversidad del País Vasco-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
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