Abstract

The structural, electronic and luminescent properties of the tetragonal phase of Y(2)WO(6)phosphors doped with different amounts of Eu(3+)have been studied. All samples were synthesized via solid-state methods, using NaCl as mineralizer. Through Rietveld refinement was found that the Eu(3+)cations only occupy the Y1 (2c) sites of the host-matrix. The thermal stability of the undoped sample was investigated using simultaneous TG-DSC thermal analyses. The SEM analysis revealed that the doped and the undoped samples have tendency to form microcrystals with smooth surfaces and in both cases it is possible to observe some agglomerates of nanoparticles. Periodic Density Functional Theory calculations (DFT) were carried out to investigate the electronic properties of the undoped material; these results show good agreement with the experimental ones. The emission spectra of all doped-samples are dominated by the electric dipole transition (ED)D-5(0)->(7)F(2)located at 613 nm, which indicates that the Eu(3+)ions are located in non-centrosimetric sites in the host-structure.