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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nommeots-Nomm, Amy
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Publications (8/8 displayed)
- 2023Cobalt containing glass fibres and their synergistic effect on the HIF-1 pathway for wound healing applicationscitations
- 2021Bioactive glasses and electrospun composites that release cobalt to stimulate the HIF pathway for wound healing applicationscitations
- 2019Four-dimensional imaging and quantification of viscous flow sintering within a 3D printed bioactive glass scaffold using synchrotron X-ray tomographycitations
- 2018Direct ink writing of highly bioactive glassescitations
- 2018Persistent luminescent particles containing bioactive glassescitations
- 2018Luminescence of Er3+ doped oxyfluoride phosphate glasses and glass-ceramicscitations
- 2017Glass and Glass-Ceramic Scaffolds : Manufacturing Methods and The Impact of Crystallization On in-Vitro Dissolutioncitations
- 2017Highly degradable porous melt-derived bioactive glass foam scaffolds 1 for bone regenerationcitations
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article
Luminescence of Er3+ doped oxyfluoride phosphate glasses and glass-ceramics
Abstract
<p>Glasses with the composition (75 NaPO<sub>3</sub>-(25-x) CaO-xCaF<sub>2</sub>) (in mol %) were prepared with 0.15 mol% of Er<sub>2</sub>O<sub>3.</sub> The effect of the glass composition and of heat treatment on the spectroscopic properties of the newly developed glasses is reported. With the progressive replacement of CaO by CaF<sub>2</sub>, the Er<sup>3+</sup>:<sup>4</sup>I<sub>13/2</sub> lifetime and the intensity of the upconversion emission increase whereas the intensity of the emission at 1.5 μm decreases due to the decrease in the phonon energy in the as-prepared glasses. The glasses were heat treated at 20 °C above their respective glass transition temperature for 17 h to form nuclei and then at their crystallization temperature from 15min to 1 h to grow the nuclei into crystals. The heat treatment leads to the precipitation of crystalline phases, the composition of which depends upon the glass composition. As the Er<sup>3+</sup>:<sup>4</sup>I<sub>13/2</sub> lifetime increases and the intensity of the upconversion increases for the glass with x = 0 after heat treatment, the Er<sup>3+</sup> ions are expected to be incorporated into the phosphate-based crystals. However, as the shape of the emission band at 1.5 μm remains unchanged and the intensity of the upconversion decreases significantly after heat treatment of the glasses with x > 10, the crystals found in the glass-ceramics with x > 10 are thought to free of Er<sup>3+</sup> ions. Although Er<sup>3+</sup> ions entered in the CaF<sub>2</sub> crystals precipitating in aluminosilicate glass, the Er<sup>3+</sup> ions are believed to remain in the amorphous phosphate part of the glass-ceramic containing CaF<sub>2</sub> crystals.</p>