A NIR long persistent Cr³⁺:SrGa₁₂O₁₉ phosphor with persistent time lasting formore than 2 hhas been successfully fabricated.The doped Cr³⁺ ions prefer to occupy the octahedral sites of Ga³⁺with the intermediate crystal field strength. The NIR LPP can be effectively realized by UV (250~400 nm) illumination, but is hardly achieved by visiblelight (400~650 nm) irradiation. The realization of LPP in Cr³⁺: SrGa₁₂O₁₉is believed ascribing to the persistent energy transfer from the SrGa₁₂O₁₉host to the Cr³⁺ ions, and the filling/releasing of electronsinto/from the shallow and deep traps assisted by the conduction band.

Chem. Asian J.全文链接：http://onlinelibrary.wiley.com/doi/10.1002/asia.201400009/abstract