In this work, we made five samples of SrA12O4: Eu2+, Dy3+, the α phase and β phase SrAI2O4:Eu2+,Dy3+ powder and pellet samples, and α phase single crystal. We have measured the emission spectra of all the samples. All the emission peaks are around 520 nm, which correspond to the transition from 4f65d1(2Eg) to 4f7(8S7/2) of Eu2+ in SrAI2O4 host. The intensity of emission of theβ phase is stronger than that of the α phase. We believe that it is because the Eu2+ ions have occupied the two types of sites in the α phase SrAI2O4 host and the lifetime of the transition of Eu2+ in the A site is longer than that in the B site. This result also proves that the β phase of the material is brighter than the α phase. In addition, the β phase can be achieved by quenching technique.