Rietveld refinement and optical properties of SrWO4:Eu3+ powders prepared by the non-hydrolytic sol-gel method
作者： PFS Pereira , IC Nogueira , E Longo , EJ Nassar , ILV Rosa
DOI: 10.1016/S1002-0721(14)60391-4
关键词:
摘要: Abstract We investigated the effect of annealing time on structure and optical properties SrWO4:Eu3+ powders prepared by non-hydrolytic sol-gel method heat treated at 800 °C for 2, 4, 8 16 h. Thermogravimetric differential thermal analyses revealed that were obtained about °C. X-ray diffraction patterns Rietveld refinement data confirmed all had a scheelite-type tetragonal structure. Micro-Raman Fourier transform infrared spectra indicated structural order short range anti-symmetric stretching vibrations O–W–O bonds associated with tetrahedral [WO4] clusters. Optical ultraviolet-visible (UV-vis) diffuse reflectance, photoluminescence (PL) which provided evolution quantum efficiency (η) lifetime (τ). UV-vis spectroscopy evidenced intermediate energy levels within band gap powders. PL validated Eu3+ electric-dipole (5D0→7F2) transition in emission was dominant proved ions positioned site without an inversion center. [(5D0→7F2)/(5D0→7F1)] ratios showed located low symmetry environment. The emission, η τ dependence behavior higher relative intensity as well values related to other samples when
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