1. Luminescence of SiO 2 -BaF 2 :Tb 3+ , Eu 3+ Nano-Glass-Ceramics Made from Sol–Gel Method at Low Temperature.
- Author
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Pawlik, Natalia, Szpikowska-Sroka, Barbara, Goryczka, Tomasz, Pietrasik, Ewa, and Pisarski, Wojciech A.
- Subjects
GLASS-ceramics ,ATTENUATED total reflectance ,SOL-gel processes ,LOW temperatures ,SOL-gel materials ,DIFFERENTIAL scanning calorimetry ,LUMINESCENCE - Abstract
The synthesis and characterization of multicolor light-emitting nanomaterials based on rare earths (RE
3+ ) are of great importance due to their possible use in optoelectronic devices, such as LEDs or displays. In the present work, oxyfluoride glass-ceramics containing BaF2 nanocrystals co-doped with Tb3+ , Eu3+ ions were fabricated from amorphous xerogels at 350 °C. The analysis of the thermal behavior of fabricated xerogels was performed using TG/DSC measurements (thermogravimetry (TG), differential scanning calorimetry (DSC)). The crystallization of BaF2 phase at the nanoscale was confirmed by X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM), and the changes in silicate sol–gel host were determined by attenuated total reflectance infrared (ATR-IR) spectroscopy. The luminescent characterization of prepared sol–gel materials was carried out by excitation and emission spectra along with decay analysis from the5 D4 level of Tb3+ . As a result, the visible light according to the electronic transitions of Tb3+ (5 D4 →7 FJ (J = 6–3)) and Eu3+ (5 D0 →7 FJ (J = 0–4)) was recorded. It was also observed that co-doping with Eu3+ caused the shortening in decay times of the5 D4 state from 1.11 ms to 0.88 ms (for xerogels) and from 6.56 ms to 4.06 ms (for glass-ceramics). Thus, based on lifetime values, the Tb3+ /Eu3+ energy transfer (ET) efficiencies were estimated to be almost 21% for xerogels and 38% for nano-glass-ceramics. Therefore, such materials could be successfully predisposed for laser technologies, spectral converters, and three-dimensional displays. [ABSTRACT FROM AUTHOR]- Published
- 2022
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