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Luminescence of SiO_{2}-BaF_{2}$:Tb^{3+}$, $Eu^{3+}$ Nano-Glass-Ceramics Made from Sol–Gel Method at Low Temperature
| Content Provider | MDPI |
|---|---|
| Author | Pawlik, Natalia Szpikowska-Sroka, Barbara Goryczka, Tomasz Pietrasik, Ewa Pisarski, Wojciech A. |
| Copyright Year | 2022 |
| Description | 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 $BaF_{2}$ nanocrystals co-doped with $Tb^{3+}$, $Eu^{3+}$ 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 $BaF_{2}$ 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 the$ $^{5}$D_{4}$ level of $Tb^{3+}$. As a result, the visible light according to the electronic transitions of $Tb^{3+}$ (^{5}$D_{4}$ →$ $^{7}$F_{J}$ (J = 6–3)) and $Eu^{3+}$ (^{5}$D_{0}$ →$ $^{7}$F_{J}$ (J = 0–4)) was recorded. It was also observed that co-doping with $Eu^{3+}$ caused the shortening in decay times of the$ $^{5}$D_{4}$ 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 $Tb^{3+}/Eu^{3+}$ 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. |
| Starting Page | 259 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12020259 |
| Journal | Nanomaterials |
| Issue Number | 2 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-01-14 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Ceramics Baf2 Nanophase Oxyfluoride Nano-glass-ceramics Tb3+/eu3+ Energy Transfer Sol–gel Chemistry |
| Content Type | Text |
| Resource Type | Article |
