Thermally and Optical Stimulated Luminescence studies in oxyfluoride glasses and glass-ceramics

Reference	Presenter	Authors (Institution)	Abstract
10-020	Mauricio Rodriguez	Rodriguez, M.(Universidad de la República);	Rare earth (RE) ion doped borate glasses present high optical transparency, mechanical, chemical and thermal stability. For these reasons, they are largely studied for solid-state lighting and thermoluminescent dosimetry applications. Here, we report the preparation of oxyfluoroborate glasses belonging to the system NaF - BaO - ${\mathrm{B}}_2{\mathrm{O}}_3$ doped with ${\mathrm{Nd}}^{3+}$ and with ${\mathrm{Er}}^{3+}$. Glasses were -prepared by the melt/quenching technique. Glass crystallization was studied using thermal analysis and X-ray diffraction techniques. Optical absorption spectra were studied on undoped and on doped samples showing typical RE transitions. Thermally stimulated luminescence (TL) was studied on undoped and doped glass samples. The analysis of the glow curve was done using the general model fitting approach. The well-known quenching effect was studied evaluating the area under the glow curve. Both dopants affect glass stability. Glass crystallization was done in order to grow nanocrystallites into the amorphous phase. Luminescence analysis of glass ceramics were done in the same way. From our results, we observed that ${\mathrm{Nd}}^{3+}$ presents a strong quenching effect that should be in small amount for glasses to be used these materials as TL detectors.
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