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Title: Structural and photoluminescence investigations of Tb3+/Eu3+ codoped silicate sol-gel glass-ceramics containing CaF2 nanocrystals
Authors: Pawlik, Natalia
Szpikowska-Sroka, Barbara
Goryczka, Tomasz
Pisarska, Joanna
Pisarski, Wojciech A.
Keywords: Tb3+/Eu3+ energy transfer; sol-gel processing; glass-ceramics; fluoride nanocrystals
Issue Date: 2021
Citation: "Materials" (2021), iss. 4, art. no. 754, s. 1-24
Abstract: In this work, the series of Tb3+/Eu3+ co-doped xerogels and derivative glass-ceramics containing CaF2 nanocrystals were prepared and characterized. The in situ formation of fluoride crystals was verified by an X-ray diffraction technique (XRD) and transmission electron microscopy (TEM). The studies of the Tb3+/Eu3+ energy transfer (ET) process were performed based on excitation and emission spectra along with luminescence decay analysis. According to emission spectra recorded under near-ultraviolet (NUV) excitation (351 nm, 7F6 ! 5L9 transition of Tb3+), the mutual coexistence of the 5D4 ! 7FJ (J = 6–3) (Tb3+) and the 5D0 ! 7FJ (J = 0–4) (Eu3+) luminescence bands was clearly observed. The co-doping also resulted in gradual shortening of a lifetime from the 5D4 state of Tb3+ ions, and the ET efficiencies were varied from ET = 11.9% (Tb3+:Eu3+ = 1:0.5) to ET = 22.9% (Tb3+:Eu3+ = 1:2) for xerogels, and from ET = 25.7% (Tb3+:Eu3+ = 1:0.5) up to ET = 67.4% (Tb3+:Eu3+ = 1:2) for glass-ceramics. Performed decay analysis from the 5D0 (Eu3+) and the 5D4 (Tb3+) state revealed a correlation with the change in Tb3+–Eu3+ and Eu3+–Eu3+ interionic distances resulting from both the variable Tb3+:Eu3+ molar ratio and their partial segregation in CaF2 nanophase.
DOI: 10.3390/ma14040754
ISSN: 1996-1944
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