Chinese Optics Letters · 2012 · 32 citations · 0 references
Natural SciencesChemistryMaterials ScienceCeramic MaterialsInorganic ChemistrySpectroscopyAluminum OxidesGlass MaterialsOptical GlassesEmission SpectraGlass StructureGlass TransitionPhotoluminescencePhotoluminescence SpectroscopyPolymerization DegreeSilicate Glass StructureSilicate Glasses
The structural and spectroscopic properties of Na 2 O-Al 2 O 3 -SiO 2 -xP 2 O 5 glasses (x = 0 to 7 mol%) are investigated. Both Raman and IR spectra reveal that discrete phosphate species ([PO 4 ] -3 , [PO 3 O 1/2 ] -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 (2,4,6) of Er 3+ , the asymmetry of local environment around Er 3+ becomes higher, and the bond covalency between Er 3+ and O 2-decreases after P2O5 is introduced. In the emission spectra, photoluminescence intensity increases with increasing P2O5 concentration and the spectra are inhomogeneously broadened, revealing that the ligand electric field around Er 3+ is dramatically changed, and the glass matrix becomes disordered.