http://hdl.handle.net/20.500.12128/18543
Tytuł: | Studies of sol-gel evolution and distribution of Eu3+ ions in glassceramics containing LaF3 nanocrystals depending on initial sols composition |
Autor: | Pawlik, Natalia Szpikowska-Sroka, Barbara Goryczka, Tomasz Pisarski, Wojciech A. |
Słowa kluczowe: | oxyfluoride glass–ceramics; sol-gel method; Eu3+ ions; fluoride nanocrystals |
Data wydania: | 2021 |
Źródło: | "International Journal of Molecular Sciences" (2021), iss. 3, art. no. 996, s. 1-22 |
Abstrakt: | In this work, we performed a systematic analysis of the impact of selected chemical reagents used in sol-gel synthesis (i.e., N,N-dimethylformamide) and different catalyst agents (i.e., CH3COOH, HNO3) on the formation and luminescence of Eu3+-doped SiO2–LaF3 nano-glass–ceramics. Due to the characteristic nature of intra-configurational electronic transitions of Eu3+ ions within the 4f6 manifold (5D0 → 7FJ, J = 0–4), they are frequently used as a spectral probe. Thus, the changes in the photoluminescence profile of Eu3+ ions could identify the general tendency of rare earth materials to segregate inside low-phonon energy fluoride nanocrystals, which allows us to assess their application potential in optoelectronics. Fabricated sol-gel materials, from sols to gels and xerogels to nano-glass–ceramics, were examined using several experimental techniques: X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR), and luminescence measurements. It was found that the distribution of Eu3+ ions between the amorphous silicate solgel host and LaF3 nanocrystals is strictly dependent on the initial composition of the obtained sols, and the lack of N,N-dimethylformamide significantly promotes the segregation of Eu3+ ions inside LaF3 nanocrystals. As a result, we detected long-lived luminescence from the 5D0 excited state equal to 6.21 ms, which predisposes the obtained glass–ceramic material for use as an optical element in reddish-orange emitting devices. |
URI: | http://hdl.handle.net/20.500.12128/18543 |
DOI: | 10.3390/ijms22030996 |
ISSN: | 1422-0067 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
Plik | Opis | Rozmiar | Format | |
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Pawlik_studies_of_sol_gel_evolution.pdf | 3,61 MB | Adobe PDF | Przejrzyj / Otwórz |
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