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Title: Sol-Gel Glass-Ceramic Materials Containing CaF2:Eu3+ Fluoride Nanocrystals for Reddish-Orange Photoluminescence Applications
Authors: Pawlik, Natalia
Szpikowska-Sroka, Barbara
Goryczka, Tomasz
Pisarski, Wojciech A.
Keywords: CaF2 nanocrystals; glass-ceramics; Eu3+; luminescence; sol-gel synthesis
Issue Date: 2019
Citation: Applied Sciences, Vol. 9 (2019), Art. No. 5490
Abstract: CaF2:Eu3+ glass-ceramic sol-gel materials have been examined for reddish-orange photoluminescence applications. The transformation from precursor xerogels to glass-ceramic materials with dispersed fluoride nanocrystals was verified using several experimental methods: di erential scanning calorimetry (DSC), thermogravimetric analysis (TG), X-ray di raction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR-ATR), energy dispersive X-ray spectroscopy (EDS) and photoluminescence measurements. Based on luminescence spectra and their decays, the optical behavior of Eu3+ ions in fabricated glass-ceramics were characterized and compared to those of precursor xerogels. In particular, the determined luminescence lifetime of the 5D0 excited state of Eu3+ ions in nanocrystalline CaF2:Eu3+ glass-ceramic materials is significantly prolonged in comparison with prepared xerogels. The integrated intensities of emission bands associated to the 5D0 ! 7F2 electric-dipole transition (ED) and the 5D0 !7F1 magnetic-dipole transition (MD) are changed drastically during controlled ceramization process of xerogels. This implies the e cient migration of Eu3+ ions from amorphous silicate sol-gel network into low-phonon energy CaF2 nanocrystals.
DOI: 10.3390/app9245490
ISSN: 2076-3417
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