Structure-property relations in rare-earth doped GeO2-B2O3-Al2O3-PbO-PbF2 glasses by modern magnetic resonance techniques

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Abstract
10-077 Eduar Enrique Carvajal Carvajal, E.E.(Universidade Federal de São Carlos); Doerenkamp, C.(Universidade de São Paulo); Donoso, J.P.(Universidade de São Paulo); de Camargo, A.(Universidade de São Paulo); Eckert, H.(University of Sao Paulo); Rare earth doped oxyfluoride glasses are of great interest for optical applications due to their low phonon energy and high ionic character compared to pure oxide glasses. A prominent example of RE doped oxyfluoride glasses is the composition GeO2-PbO-10PbF2, which is already used for optical amplifier applications in telecommunication systems. Additionally, their crystallization is of interest for glass ceramic laser design. Replacement of the expensive GeO2 component by B2O3 has been shown to produce glasses with a similar application spectrum, while being more economically priced. In this work, we report the preparation and characterization of RE doped (Eu3+, Yb3+) oxyfluoride glasses with the composition (40?x)B2O3-xGeO2-10Al2O3-40PbO-10PbF2 (x= 0 to 40), where the addition of Al2O3 serves to improve the optical properties. Modern Solid-State NMR and pulsed and continuous-wave EPR techniques are used to develop a structural rationale for the design of materials with optimized optical properties. While the NMR spectra of the 11B, 19F, 27Al and 207Pb nuclear probes give information about the structure of the glassy matrix, EPR studies of the paramagnetic Yb3+ dopants give insight into the local environments of the luminescent rare-earth ions. Based on further characterization via XRD and DSC measurements as well as the functional characterization by UV/vis absorption and luminescence spectroscopies we develop a consistent picture of the structure-property relation in this class of materials.
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