Effect of H3BO3 on phases, micromorphology and persistent luminescence properties of SrAl2O4: Eu2+, Dy3+ phosphors

Long afterglow material SrAl 2 O 4 : Eu 2+ , Dy 3+ were synthesized by solution combustion method, and the effects of the concentration of H 3 BO 3 on phases, micromorphology, photoluminescence properties, long afterglow properties and thermoluminescence glow curves of the phosphors were studied systematically. Phosphor with SrAl 2 O 4 pure phase can be obtained when the concentration of H 3 BO 3 is 2 mol%. The micromorphology of the phosphors changed a lot due to the varied amount of H 3 BO 3 , and nanoflower like phosphors was formed when the concentration of H 3 BO 3 is 10 mol%. With the continue increasing of H 3 BO 3 , the nanoflower aggregate together to form irregular particles with a larger size and the petal gradually disappear while the luminescence intensity shows a linear increase. The decay curves and the Thermoluminescence glow curves were also measured, and the depth of traps were calculated. The results show that with the increasing concentration of H 3 BO 3 , the trap depth increasing gradually. However, the trap depth decrease gradually when the content of H 3 BO 3 beyond 20 mol%, which caused by the diffusion of surplus B 3+ in the interstitial sites.