Abstract
We investigated the persistent luminescence (PersL) properties of a rare earth-free Mn2+ doped AlN (AlN:Mn) red phosphor together with a commercial SrAl2O4:Eu2+, Dy3+ green persistent phosphor as a reference. Similar to its photoluminescence (PL) spectrum, the PersL spectrum of the AlN:Mn phosphor exhibited a red emission band centered at 600nm due to the Mn2+: 4T1(4G)→6A1(6S) transition with a relatively narrow full width at half maximum (FWHM) of 43nm. The luminance of AlN:Mn powders was 0.65mcd/m2 at 60min after ceasing ultraviolet (UV) illumination, and its duration upon 0.32mcd/m2 could reach over 110min. An extremely broad thermoluminescence (TL) glow curve was observed ranging from 100K to 600K and peaked at around 310K, indicating a wide trap distribution in this material.
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