Studies on SrAl_2O_4:Eu~(2+),Dy~(3+) Long Afterglow Luminescence Glass

The long afterglow luminescence powders of Eu2+ and Dy3+ activated SrAl2O4 were synthesized by solid-state reactions under a weak reductive atmosphere.The long afterglow luminescence glass were synthesized by SrAl2O4:Eu2+,Dy3+long afterglow luminescence powders and low melting point PbOZnO-B2O3-SiO2 glass,and systematically characterized by photoluminescence excitation and emission spectra and the concentration of the long afterglow luminescence powders,etc.The results of experiments show that the long afterglow luminescence glass maintained the phosphorescence properties of SrAl2O4:Eu2+,Dy3+ long afterglow luminescence powders.After the irradiation with ultraviolet light,the long afterglow luminescence glass emitted yellowish-green long-lasting phosphoresecence(LLP) with a spectrum peaking at about 520 nm ascribed to the characteristic 4f65d1→4f7 transition of Eu2+.As the luminescence powders concentrations at 30 %,the long afterglow luminescence glass with high brightness and long persistent phosphorescence were obtained under the temperature of the experiment.With the melt temperature increasing,the luminescent intensity and the afterglow time of the long afterglow luminescence glass decreased.