Efficient Multiphase Green Phosphor Based On Strontium Thiogallate

Efficient multiphase green phosphors based on strontium thiogallate were synthesized by solid state reaction at 900-1000 degrees C with carbon as a reduction atmosphere. The detailed x-ray diffraction analysis, energy dispersive spectroscopy, Raman spectroscopy, and photoluminescence were carried out in order to enlarge the understanding of the radiative processes in multiphase green phosphors based on strontium thiogallate. The crystal field splitting, Stokes shift, redshift, and centroidal shift were estimated, and the results are in good agreement with mathematical calculations. Our study confirms that the proposed multiphase green phosphor based on strontium thiogallate is a good candidate for solid state lighting and display devices with higher intensity and better chromaticity coordinates in comparison with the known commercial phosphors. (C) 2009 American Institute of Physics. [DOI:10.1063/1.3093932]