Y3Al5-xGaxO12:Cr ~(3+) : a novel red persistent ceramic phosphor with high brightness

摘要

Jian Xu, Jumpei Ueda, and Setsuhisa Tanabe (Kyoto University) / We report red persistent phosphors of Y3Al5-xGaxO12:Cr ~(3+) garnet (YAGG:Cr ~(3+) , x from 0 to 5). In this material, Cr ions act both as emission centers and electron traps, the electron trap depth can be optimized via modifying the Ga~(3+) substitution content x. After ceasing UV (250-380 nm) irradiation for 1 h, the persistent luminescence intensity of the YAGG:Cr ~(3+) (x=3) ceramic phosphor was nearly 5 times higher than that of the widely used ZnGa2O4:Cr ~(3+) red persistent phosphor. Such novel red persistent phosphors possess a great potential for an improved in vivo bio-imaging application.