Photophysical properties of RE3+ (RE = Pr, Sm, Eu, Tb, Dy and Tm) doped Ag2WO4

Reference	Presenter	Authors (Institution)	Abstract
08-084	Ivo Mateus Pinatti	Pinatti, I.M.(Federal University of São Carlos); Longo, E.(Federal University of São Carlos); Rosa, I.L.(Federal University of São Carlos);	Metal Tungstates have been extensively studied due to their outstanding properties which permits be employed in various fields, including phosphors, laser, catalysis and other functional materials based on their electronic, optical, and chemical characteristics. Silver Tungstate is an example of this class of materials which has many applications due to its photoluminescent and photocatalytic properties. Emission bands of Rare Earth (RE) ions are easy to study in the visible region due to the structure of the energy levels, such as fine lines of absorption and emission. Rare Earth (RE = Pr, Sm, Eu, Tb, Dy and Tm) doped Silver Tungstate (?-Ag2WO4:RE3+) powders were synthesized by the coprecipitation method at 90 °C for 30 minutes. X-ray diffraction presented a single phase indexed as orthorhombic structure with space group Pn2n. The emission spectra showed the characteristic RE transitions in the visible region of electromagnetic spectrum. The color coordinates of the system were evaluated and plotted on a standard CIE index diagram. Micro-Raman were used to analyze the degree of structural order?disorder at short-range and revealed the presence of at least 14 high intensity Raman-active vibrational modes. The FE-SEM micrograph showed hexagonal rod-like ?-Ag2WO4 microcrystals with agglomerate nature and average length of 1 ?m and width of 90 nm. These results show novel and interesting properties for these new materials.
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