Structure dependent luminescence characterization of green-yellow emitting Sr2SiO4:Eu2+ phosphors for near UV LEDs

► Mixtures of α- and β-Sr2SiO4:Eu2+ phosphors were prepared by 3 different synthesis methods. ► Emission peak blue-shifts as the amount of β phase increases. ► Emission intensity and QE of the α+β powders are greater than those of single α phase. ► Phosphors prepared by sol-gel/Pechini have the highest emission intensity and QE.