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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Galleani, Gustavo ; Santagneli, Silvia Helena ; Messaddeq, Younes ; de Oliveira, Jr., Marcos ; Eckert, Hellmut
Total Authors: 5
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 19, n. 32, p. 21612-21624, AUG 28 2017.
Web of Science Citations: 7

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 Al-27/P-31 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 D-5(0) -> F-7(2) and D-5(0) -> F-7(1) transition intensity ratio, the normalized phonon sideband intensities in the excitation spectra, and the lifetime of the D-5(0) 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. (AU)

FAPESP's process: 15/22828-6 - Pushing the boundaries of optical fibers: from photonics to optogenetics and environmental monitoring
Grantee:Younes Messaddeq
Support type: Research Projects - SPEC Program
FAPESP's process: 13/23490-3 - Magnetic resonance techniques for the study of Structure/Property correlations in photonic glassy and glass ceramic materials
Grantee:Marcos de Oliveira Junior
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC