The crystal growth of CsSrBr3: Eu with improved energy resolution for use in gamma-ray detection applications is reported. CsSrBr3 boules doped with 5% Eu were grown by the vertical Bridgman method in quartz ampoules of 17 mm and 22 mm diameter. It was observed that the addition of an excess of CsBr in the melt improved the optical transparency and energy resolution of the scintillator crystals. The energy resolution of the gamma-ray spectra recorded with crystals measuring circle divide 22 mm x 15 mm was 7.4% at 662 keV (for a crystal with non-optimized stoichiometry) and 6.2% at 662 keV (for a crystal with optimized stoichiometry i.e. excess CsBr in the melt), which is a significant improvement over previous reports. Temperature dependent powder XRD measurements were also carried out to study the solid solid phase transition which occurs as the crystals are cooled after growth. (C) 2016 Elsevier B.V. All rights reserved.