Luminescence and structure of Eu2+-doped Ba2CaMg2Si6O17

Eu2+-activated Ba2CaMg2Si6O17 phosphors were synthesized by conventional solid-state reaction. The phase formation was confirmed by X-ray powder diffraction measurement. The photoluminescence excitation and emission spectra were investigated. The phosphor presents blue-emitting luminescence. The crystallographic sites of Eu2+ ions in Ba2CaMg2Si6O17 host were discussed on the base of luminescence properties and the crystal structure. The lightly Eu2+-doped sample shows one luminescence center for the Eu2+ ions on Ba2+ sites, while there are two luminescence centers for the Eu2+ ions on both the Ba and Ca sites in heavily Eu2+-doped sample. The dependence of luminescence intensity on temperatures and the activation energy (Delta E) for the thermal quenching were reported. The phosphor shows an excellent thermal stability on temperature quenching because of the special layered structure of Ba2+ ions in the interlayer between SiO4 layers. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.