Luminescent and magnetic properties of the afterglow phosphors GdSr2AlO5:RE3+ (RE3+ = Eu3+, Sm3+, Pr3+ and Dy3+)

Abstract

Novel afterglow phosphors based on the GdSr₂AlO₅ host were prepared by solid-state reaction under reductive atmosphere. The photoluminescence, afterglow, thermoluminescence and magnetism properties of GdSr₂AlO₅:RE³⁺ (RE³⁺ = Eu³⁺, Sm³⁺, Pr³⁺ and Dy³⁺) were discussed in detail for the first time in this paper. By doping appropriate rare earth ions into the GdSr₂AlO₅ host, all phosphors showed a satisfactory long-wavelength afterglow phenomenon and excellent paramagnetism characteristics. The mass magnetic susceptibility value was determined to be approximately 4.4052 × 10⁻⁵ emu g⁻¹ Oe⁻¹.