Site selective luminescence of Eu3+ ions in K2Mg(SO4)2⋠6H2O crystal

Eu3+ doped K2Mg(SO4)2⋅6H2O crystal was prepared by evaporation method at room temperature. A complete structure characterization including X-ray diffraction, Raman and infrared was carried out. The results reveal that this crystal crystallizes in a monoclinic structure and the most active phonons are associated with vibrations of molecular water and sulfate environments. On the other hand, the emission spectrum indicates that Eu3+ ions occupy two different sites. Therefore, a study about the luminescence from each local environment is presented. The emission spectra and luminescence decays of Eu3+ ions indicate than there are not energy transfer processes between both sites.