Synthesis and spectroscopic characterization of the K4BaSi3O9:Eu3+

K4BaSi3O9:Eu3+ polycrystals were synthesized by solid state method. X-ray powder diffraction measurements confirmed structure of the samples. The excitation and the emission spectra of orthorhombic K4BaSi3O9 doped with Eu3+ were investigated. The excitation spectrum exhibits a broad band with maximum at 220 nm corresponding to the charge transfer (CT) transition between O2- and Eu3+ ions and smaller 4f-4f transitions. The emission of investigated phosphor was excited at 395 nm and has quantum efficiency (QE) equal 27%. The emission maximum at 616.5 nm was assigned to the D-5(0) -> F-7(2) transition of Eu3+ ions. The luminescence decay profiles as well as the thermal quenching were measured and analyzed. K4BaSi3O9:Eu(3+)has high temperature quenching of the emission T-0.5 = 335 degrees C. (C) 2014 Elsevier B.V. All rights reserved.