Unusual near-infrared luminescence from Ti-doped MgSiF6·6H2O powder

Abstract We prepared Ti-doped MgSiF 6 ·6H 2 O powder through a chemical synthesis method and observed Ti-related near-infrared (NIR) photoluminescence (PL), resulting from the dehydration due to vacuum evacuation. The NIR PL characteristics have unusual features: its emission intensity nonlinearly increases with the excitation laser power and a slow (∼1 s) increase of the emission intensity is observed under the continuous irradiation of the excitation laser light. These results indicate that the NIR PL band is activated by a heating effect due to the laser irradiation.