Effect of H3BO3 on phases, micromorphology and persistent luminescence properties of SrAl_20_4: Eu~(2+), Dy~(3+) phosphors

摘要

Long afterglow material SrAl_20_4: Eu~(2+), Dy~(3+) were synthesized by solution combustion method, and the effects of the concentration of H_3BO_3 on phases, micro-morphology, photoluminescence properties, long afterglow properties and thermoluminescence glow curves of the phosphors were studied systematically. Phosphor with SrAl_20_4 pure phase can be obtained when the concentration of H_3BO_3 is 2 mol%. The micromorphology of the phosphors changed a lot due to the varied amount of H_3BO_3, and nanoflower like phosphors was formed when the concentration of H_3BO_3 is 10 mol%. With the continue increasing of H_3BO_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_3BO_3, the trap depth increasing gradually. However, the trap depth decrease gradually when the content of H_3BO_3 beyond 20 mol%, which caused by the diffusion of surplus B~(3+) in the interstitial sites.