Combined Rietveld refinement of CaMgSi2O6:Eu2+ using X-ray and neutron powder diffraction data

The structural parameters for the blue-emitting phosphor, CaMgSi 2O6 (CMS):Eu2+, synthesized by a conventional solid-state reaction, such as lattice parameters, mass fractions, the occupancy of Eu2+ ions, atomic coordinates, isotropic thermal parameters were determined. The combined Rietveld refinement with the crystal structural model was used. These refined structural parameters might be applied to calculate the critical distance for energy transfer between sensitizer and activator, which is necessary to understand the energy transfer mechanism of CMS:Eu2+. The PL excitation and emission spectra of the CMS:Eu2+ sample under 147 nm excitation were shown.