Effects of NaCl flux on microstructure and luminescent characteristics of KSrPO4:Eu2+ phosphors

► The fluxes affected the formation of the phosphors in the high temperature sintering. ► Flux method has potential advantages and the ability to control the particle size of products. ► The particle size of the KSr0.99PO4:0.01Eu2+ phosphors can be enhanced with addition of NaCl flux. ► The maximum photoluminescence intensity of KSr0.99PO4:0.01Eu2+ phosphors was 6 wt.%.