A Novel Near‐Infrared Emitting Sr 2 LuSbO 6 :Fe 3+ Phosphor with Persistent Luminescence Performance

The near‐infrared (NIR) persistent luminescence (PersL) materials have attracted widespread attention owing to the unique self‐sustained light with good penetrability. Currently, most of the reported NIR PersL materials are activated by Cr 3+ . Considering the potential toxicity of chromium ions, there is an urgent requirement to explore the Cr 3+ ‐free NIR phosphors. Herein, a novel NIR phosphor Sr 2 LuSbO 6 :Fe 3+ (SLSO:Fe 3+ ) is prepared and its luminescence properties are systematically studied. The Fe 3+ ‐activated Sr 2 LuSbO 6 exhibits a long‐wavelength NIR emission band centered at 890 nm with a 110 nm full‐width at half maximum (FWHM), and its PersL can last over 18 h. The phosphor shows excellent PersL stability even after being dispersed in solutions of different environments for 7 days. Furthermore, the PersL emitted by the phosphor can penetrate the 2 cm thickness beef, evidencing its good NIR PersL penetration property. This work provides a novel NIR PersL materials based on Fe 3+ luminescence for technological applications and also contributes to accelerate the development of new‐generation Fe 3+ ‐doped NIR PersL phosphor toward versatile applications.