Synthesis, structural characterization and optical study of Dy3+-doped langbeinite salts

This work highlights some physical properties on langbeinite K2Mg2(SO4)(3):Dy3+ sulfates which were prepared by high temperature solid state reaction technique. X-ray powder diffraction confirmed the high purity of the obtained phases. These sulfates crystallize in the cubic phase with space group P2(1)3. Several spectroscopic measurements on the synthesized samples were carried out: Fourier transform infrared spectroscopy showed the different vibration modes of sulfate group, the ultraviolet-visible-near infrared absorption spectroscopy revealed Dy3+ transitions from the ground state H-6(15/2) to different excited levels and the emission spectra in the visible region revealed four emission bands originated from the F-4(9/2) level to the H-6(15/2), H-6(13/2), H-6(11/2) and H-6(9/2) + F-6(11/2) levels of Dy3+ ions. Moreover, the temperature dependence lifetime of this emitting level can be explained in terms of the thermalization effect. (c) 2016 Elsevier B.V. All rights reserved.