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Phase evolution of KLaF4 nanocrystals and their effects on the photoluminescence of Nd3+ doped transparent oxyfluoride glass-ceramics

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Abstract

Transparent oxyfluoride glass-ceramics (GCs) were prepared starting from the glass composition 70SiO2–7Al2O3–16K2O–7LaF3 (mol%) doped with four different Nd3+ concentrations (0.1–2 mol%). The glass-ceramics were prepared by heat treatment above the corresponding glass transition temperatures (Tg + 10–100 °C). Depending on the Nd3+ concentration, cubic (α-phase) and hexagonal (β-phase) KLaF4 nanocrystals (NCs) precipitated from the starting glass. By X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM), the crystallization of the cubic structure was observed for all compositions, while β-KLaF4 nanocrystals were mostly detected for the glass-ceramic samples doped with 0.5 mol% NdF3. This noteworthy result is confirmed by site-selective laser spectroscopy. The presence of α-KLaF4 and β-KLaF4 crystalline phases is unambiguously identified from the emission and excitation spectra and lifetime measurements of the 4F3/2 state of Nd3+ ions. The spectroscopic results confirm those obtained with XRD and HR-TEM techniques: α-KLaF4 NCs are found to be present for all NdF3 concentrations whereas β-KLaF4 NCs are predominant in the glass-ceramic samples doped with 0.5 mol%.

Graphical abstract: Phase evolution of KLaF4 nanocrystals and their effects on the photoluminescence of Nd3+ doped transparent oxyfluoride glass-ceramics

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Publication details

The article was received on 30 May 2018, accepted on 13 Aug 2018 and first published on 17 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE00897C
Citation: CrystEngComm, 2018, Advance Article
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    Phase evolution of KLaF4 nanocrystals and their effects on the photoluminescence of Nd3+ doped transparent oxyfluoride glass-ceramics

    A. A. Cabral, R. Balda, J. Fernández, G. Gorni, J. J. Velázquez, L. Pascual, A. Durán and M. J. Pascual, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00897C

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