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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.)

Composition-Structure-Property Correlations in Rare-Earth-Doped Heavy Metal Oxyfluoride Glasses

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Doerenkamp, Carsten [1] ; Carvajal, Eduar [2] ; Magon, Claudio J. [1] ; Faria, Walter J. G. J. [1] ; Pedro Donoso, J. [1] ; Galva Gobato, Y. [2] ; de Camargo, Andrea S. S. [1] ; Eckert, Hellmut [1, 3]
Total Authors: 8
[1] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, Rod Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] WVVU Munster, Inst Phys Chem, Corrensstr 28-30, D-48149 Munster - Germany
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 123, n. 36, p. 22478-22490, SEP 12 2019.
Web of Science Citations: 0

Structure property correlations in oxyfluoride glasses have been explored in a series of lead fluoroborate and lead fluorogermanate glasses with nominal compositions (50 - x - y - z)B2O3-40PbO-y(Al2O3)-(10 + x)PbF2- zREF(3) and (50 - x - y)GeO2-40PbO-y(Al2O3)-(10 + x)PbF2-zREF(3) (x, y = 0, 10, 0 <= z <= 0.5, RE = Eu, Yb). Starting from glasses with a fixed PbF2 content of 10 mol %, we explore the effects of (1) increasing PbF2 content to 20 mol % and (2) incorporating the intermediate oxide Al2O3 at the expense of GeO2 or B2O3. The emission characteristics studied on Eu-doped glasses are rationalized on the basis of structural information obtained by Raman, nuclear magnetic resonance (NMR), and pulsed electron paramagnetic resonance (EPR) spectroscopies on Yb-doped samples. In the Ge-oxyfluoride glasses, increasing PbF2 content results in enhanced excited-state lifetimes of the rare-earth ions, and for this system, Eu3+ emission profiles, NMR, and EPR results suggest an increased average number of fluoride ions in the first coordination sphere of the rare-earth ions. In contrast, the effect is much less apparent in the fluoroborate glasses. In both systems, Al2O3 incorporation results in pronounced changes in the fluorine speciation, indicating the formation of aluminum-fluorine bonds. (AU)

FAPESP's process: 17/06649-0 - New Optical Materials based on Rare-Earth Doped Oxyfluoride Glasses and Ceramics: Structural Studies by Electron Paramagnetic Resonance Methods
Grantee:Carsten Doerenkamp
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