Search

Using Gd2O3 :Pr,Ce synthesized by ammonium oxalate coprecipitation method as a raw material, sulfur as a vulcanizing agent and anhydrous Na2CO3 as a fluxing agent, Gd2 O2S:Pr an d Gd2O2S :Pr,Ce were prepared by solid phase method at 1000°C in vacuum atmosphere. XRD confirmed that the reaction product was the target product. The prepared Gd2O2 S: Pr was a hexagonal single phase with a particle size distribution of 1µm-10 µm. Under the excitation of 313 nm ultraviolet light, the main emission peak was at 511 nm, which belonged to the ³P0 → ³H4 transition of Pr3+. The intensity of the main emission light changed with the content of Pr3+. When the content of Pr3+ was 0.80%, the main emission intensity was the largest. The addition of Ce3+ could significantly reduce the fluorescence after glow of Gd2O2 S: Pr, but reduce the intensity of emitted light at the same time. The amount of Ce3+ added should be balanced between afterglow control, fluorescence intensity and lifetime of scintillator. [ABSTRACT FROM AUTHOR]