Rare-earth doped fluoride phosphate glasses: Structural foundations of their luminescence properties

dc.contributor.authorGalleani, Gustavo [UNESP]
dc.contributor.authorSantagneli, Silvia Helena [UNESP]
dc.contributor.authorMessaddeq, Younes [UNESP]
dc.contributor.authorDe Oliveira, Marcos
dc.contributor.authorEckert, Hellmut
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionLaval University
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionWWU Münster
dc.description.abstractWe 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.en
dc.description.affiliationInstitute of Chemistry São Paulo State University UNESP, Prof. Francisco Degni, 55
dc.description.affiliationCenter for Optics Photonics and Lasers Laval University, 2375 rue de la terrasse
dc.description.affiliationInstituto de Física de São Carlos Universidade de São Paulo, CP 369
dc.description.affiliationInstitut für Physikalische Chemie WWU Münster, Corrensstraße 30
dc.description.affiliationUnespInstitute of Chemistry São Paulo State University UNESP, Prof. Francisco Degni, 55
dc.identifier.citationPhysical Chemistry Chemical Physics, v. 19, n. 32, p. 21612-21624, 2017.
dc.relation.ispartofPhysical Chemistry Chemical Physics
dc.rights.accessRightsAcesso restrito
dc.titleRare-earth doped fluoride phosphate glasses: Structural foundations of their luminescence propertiesen