The detailed XRD analysis, EDS, Raman spectroscopy and PL study were achieved in order to enlarge the understanding of the radiative processes in multiphase green phosphors, based on strontium thiogallate. These phosphors were synthesized by solid state reaction at 900 –1000°C with carbon as a reduction atmosphere. The crystal field splitting, Stokes shift, Red shift, and centroidal shift were estimated and they are in a good agreement with mathematical calculations. Our study confirms that 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 known commercial phosphors.