Synthesis of Sr2MgSi2O7:Eu, Dy and Sr2MgSi2O7:Eu, Dy, Nd by a modified solid-state reaction and their luminescent properties

Long afterglow phosphors Sr2MgSi2O7:Eu, Dy were synthesized by a modified solid-state reaction using H3BO3 and CO(NH2)2 as auxiliary reagents. Photoluminescence spectra showed that Sr2MgSi2O7:Eu, Dy phosphors hold a better afterglow properties when the molar ratio of Eu to Dy was 2:5. When a certain amount of Nd ion was introduced and employed NH4NO3 and citric acid instead of CO(NH2)2, the phosphors can emit red light. The analytical results indicated that there is a broader emission band centered at between 502 and 635 nm when excited by 340 nm, which is ascribed to the luminescent emission of the Eu3+. The results of characterization showed that both of the phosphors have a single-phase Sr2MgSi2O7 structure and the particle sizes are in nanophase.