Effect of additives on luminescence properties of long-persistence phosphor $SrAl_2O_4:Eu^{2+}$,$Dy^{3+}$

Long afterglow $SrAl_2O_4:Eu^{2+}$,$Dy^{3+}$ is synthesized by a solid state reaction. The effect of flux $B_2O_3$ on the sintering dynamic process, the optimum concentrations of $Eu^{2+}$ and $Dy^{3+}$ for long lasting bright luminescence property and the effect of charge compensators like $Mg^{2+}$, $Zn^{2+}$, $Na^+$, $K^+$ on long persistence have been investigated.