http://hdl.handle.net/20.500.12128/18900
Tytuł: | Structural and photoluminescence investigations of Tb3+/Eu3+ codoped silicate sol-gel glass-ceramics containing CaF2 nanocrystals |
Autor: | Pawlik, Natalia Szpikowska-Sroka, Barbara Goryczka, Tomasz Pisarska, Joanna Pisarski, Wojciech A. |
Słowa kluczowe: | Tb3+/Eu3+ energy transfer; sol-gel processing; glass-ceramics; fluoride nanocrystals |
Data wydania: | 2021 |
Źródło: | "Materials" (2021), iss. 4, art. no. 754, s. 1-24 |
Abstrakt: | 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. |
URI: | http://hdl.handle.net/20.500.12128/18900 |
DOI: | 10.3390/ma14040754 |
ISSN: | 1996-1944 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
Plik | Opis | Rozmiar | Format | |
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Pawlik_Goryczka_structural_and_photoluminescence.pdf | 7 MB | Adobe PDF | Przejrzyj / Otwórz |
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