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PurposeTo evaluate the effect of flux, activator and co‐activator on solid state synthesis of SrAl2O4: Eu2 + , Dy3 +  phosphor, where boric oxide, europium oxide and dispersium oxide were used, respectively.Design/methodology/approachTo optimise synthesis condition of long lasting phosphorescence SrAl2O4 phosphor, boric oxide was used as a flux. To improve relative intensity of SrAl2O4: Eu2 +  phosphor, the critical concentration of Eu2 +  was determined. The effect of various concentration of co‐activator on afterglow properties, the effect of Dy3 +  ion on the emission and excitation spectra were examined.FindingsThe SrAl2O4: Eu2 + , Dy3 +  phosphor powders have been synthesised by solid state reaction method. The result of XRD patterns indicated that, addition of 5 mol% B2O3 enhanced the formation of SrAl2O4 at 1,200°C. Investigation on the variation of emission intensity of different phosphors containing different amounts of Eu2 +  revealed that after 6 mol% of Eu2 +  concentration, quenching process occurred. Dy3 +  formed trap levels and results demonstrated that increasing concentration of Dy3 +  up to 5 mol% reduced the relative intensity and increased the decay time.Originality/valueUsing B2O3 as a flux and solid state reaction method for preparation of this phosphor is in good agreement with industrial production and make it economic, because of reduced sintering temperature.