Optimizing after-glow luminescent parameters of Sr 4 Al 14 O 25 :Eu 2+ , Dy 3+ , by sol–gel method and combustion process

Strontium aluminates are viewed as a promising persistent luminescent materials. There are many researches on strontium aluminates, including SrAl 2 O 4 , Sr 4 Al 14 O 25 . Between these two phases, Sr 4 Al 14 O 25 shows much better properties than SrAl 2 O 4 . The traditional way to synthesize Sr 4 Al 14 O 25 is the solid state reaction. However, it exists few problems, especially non-homogeneous product. As a result, there are two methods chosen to make homogeneous precursor. One is sol–gel method, the other is combustion with Urea as a fuel. Boric acid is added as a flux in both method. In this study, combustion process is found to be a better way for synthesizing Sr 4 Al 14 O 25 . We change the temperature, synthetic method. The samples are finely grinded and used for XRD analysis, photoluminescence measurement, and after-glow decay curve to figure out the optimizing luminescent parameters.