Core-Shell Structure and Luminescence of SrMoO4:Eu3+ (10%) Phosphors

SrMoO4:Eu3+ (10%) phosphors were produced via hydrothermal synthesis and co-precipitation. We systematically analyzed how the morphology and luminescence properties of the phosphors were affected by the synthesis conditions, including the pH of the precursor solution, stirring speed, and post-sintering temperature. The samples synthesized at pH = 8 and 9 were spindle-like rods with a core-shell structure. When the stirring speed increased to Vs=150 r/min, the core-shell structure disappeared. Photoluminescence measurements indicated that the SrMoO4:Eu3+ samples under ultraviolet radiation produced strong red emission centered at 616 nm. The luminescence properties were greatly affected by the pH, stirring during hydrothermal reaction, and use of post-annealing. The related mechansim is discussed.