Rare-earth doped fluoride phosphate glasses: structural foundations of their luminescence properties.
GALLEANI, Gustavo; SANTAGNELI, Silvia Helena; MESSADDEQ, Younes; OLIVEIRA JR., Marcos de; ECKERT, Hellmut.
GALLEANI, Gustavo; SANTAGNELI, Silvia Helena; MESSADDEQ, Younes; OLIVEIRA JR., Marcos de; ECKERT, Hellmut.
 Abstract: We report a detailed structural investigation of a series of fluoride-phosphate glasses with different phosphate/fluoride ratios in the system xSr(PO3)2-(100- x)[AlF3-CaF2-SrF2-MgF2] with x = 5, 10, 20, 40. Raman and multinuclear solid NMR spectroscopies confirm that the polyphosphate network structure is successively transformed to a structure dominated by Al-O-P linkages with increasing AlF3 content. Average numbers of Al-O-P linkages have been quantified by 27Al/31P NMR double-resonance techniques. The majority of the fluoride species are found in an alkaline earth metal/aluminum rich environment. The local environments for rare-earth ions have been characterized by EPR spectroscopy of Yb3+ ion spin probes and by photoluminescence experiments on Eu3+ dopant ions, including the 5D0 ? 7F2 and 5D0 ? 7F1 transition intensity ratio, the normalized phonon sideband intensities in the excitation spectra, and the lifetime of the 5D0 excited state. The results indicate clear correlations between these parameters as a function of composition, and confirm that even at the highest fluoride levels, there is still some residual rare-earth phosphate coordination. | |
| Physical Chemistry Chemical Physics |
| v. 19, n. 32, p. 21612-21624 - Ano: 2017 |
| Fator de Impacto: 4,123 |
| http://dx.doi.org/10.1039/C7CP03927A |  @article={002848075,author = {GALLEANI, Gustavo; SANTAGNELI, Silvia Helena; MESSADDEQ, Younes; OLIVEIRA JR., Marcos de; ECKERT, Hellmut.},title={Rare-earth doped fluoride phosphate glasses: structural foundations of their luminescence properties},journal={Physical Chemistry Chemical Physics},note={v. 19, n. 32, p. 21612-21624},year={2017}} |