Modulation of the optical properties of Na2ZnGexSi1-xO4 polycrystals doped with Eu3+ ions

The Na 2 ZnGeO 4 and Na 2 ZnSiO 4 as well as the solid solution of the Na 2 ZnGe x Si 1-x O 4 polycrystals doped with Eu 3+ ions were successfully synthesized with using the solid-state reaction method. The crystal structures were analyzed with using powder diffractometry XRD. Absorption, excitation, luminescence spectra and emission decay time were measured. Investigated material possess high thermal stability. Depending on the crystal symmetry, the Eu 3+ emission possess different maxima of its orange/red emission, in both cases, with high color purity. Energy bandgaps were obtained with using the Kubelka-Munk method. By changing the structural properties it is possible to modulate the energy bandgaps of these compounds, and change their optical properties. • The new Na 2 ZnGe x Si 1-x O 4 polycrystals doped with Eu 3+ ions were successfully synthesized • Luminescence dominate in the orange/red or deep red region • Emission of the investigated samples was excited in UV-VIS regions • By changing the Ge/Si ratio it is possible to tune bandgap of these materials • Obtained novel structure possess the original spectroscopic properties