Structural consideration on the emission properties of Eu2+-doped Ba(Sr, Ca)2MgSi2O8

Emission properties of Eu2+-doped Ba(Sr, Ca)2MgSi2O8 are discussed in terms of the crystal structure refined by Rietveld method. Ba(Sr, Ca)2MgSi2O8 has glaserite-type layered structure. In response to Sr/(Sr+Ca) ratio, the layer-framework build up by corner-sharing of MgO6 octahedra and SiO4 tetrahedra twists around C3C3 axes to match the size of B-site cation (Sr2+/Ca2+). This twist significantly affects the unit cell size and the coordination environment around B-site.Eu2+-doped Ba(Sr, Ca)2MgSi2O8 exhibited blue emission under ultraviolet irradiation. The emission spectra have been characterized by two emission components derived from Eu2+ ions occupying A- and B-site. Both components showed similar wavelength shift for different Sr/(Sr+Ca), in response to Si–O1 polarization and to the structural change.

Emission properties of Eu2+-doped Ba(Sr, Ca)2MgSi2O8 are discussed in terms of the crystal structure refined by Rietveld method. Figure optionsDownload as PowerPoint slideHighlights·
► Glaserite-type Ba(Sr, Ca)2MgSi2O8 has been prepared by a solid state reaction.·
► Ba(Sr, Ca)2MgSi2O8 changes the crystal structure, depending on Sr/(Sr+Ca) ratio.·
► Eu2+-doped Ba(Sr, Ca)2MgSi2O8 exhibits blue emission under ultraviolet irradiation.·
► Emission from Ba(Sr, Ca)2MgSi2O8 is characterized by two Eu2+ emission components.·
► The two emissions show wavelength shift in a similar manner against Sr/(Sr+Ca).