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Yb-Er codoped Na2O-Al2O3-P2O5-xSiO2 glasses containing 0 - 20 mol% SiO2 were prepared successfully. The addition of SiO2 to the phosphate glass not only lengthens the bond between pS+ and non-bridging oxygen but also reduces the number of P=O bond. In contrast with silicate glass in which there is only four-fold coordinated Si4+, most probably there coexist [SiO4] tetrahedron and [SiO6] oetahedron in our glasses. Within the range of 0 - 20 mol% SiO2 addition, the stimulated emission cross-section of Era+ ion only decreases no more than 10%. The Judd-Ofelt intensity parameters of Er3+, Ω2 does not change greatly, but Ω4 and Ω6 decrease obviously with increasing SiO2 addition, because the bond between Er3+ and O2- is more strongly eovalently bonded. 相似文献
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The structural and spectroscopic properties of Na2O-Al2O3-SiO2-xP2O5 glasses(x = 0 to 7 mol%) are investigated.Both Raman and IR spectra reveal that discrete phosphate species([PO4]-3,[PO3O1/2]-2) with low polymerization degree can be formed in the silicate glass.These phosphate structures scavenge non-bridging oxygen ions and cations from the silicate network,resulting in an increase of the glass transition temperature.According to the Judd-Ofelt intensity parameters(Ω2,Ω4,Ω6) of Er3+.the asymmetry of local environment around Er3+ becomes higher,and the bond covalency between Er3+ and O2-decreases after P2O5 is introduced.In the emission spectra,photo-luminescence intensity increases with increasing P2O5 concentration and the spectra are inhornogeneously broadened,revealing that the ligand electric field around Er3+ is dramatically changed,and the glass matrix becomes disordered. 相似文献
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