Fe3+‐activated magnetoplumbite persistent luminescence phosphor by modulating the oxygen vacancy

Abstract Broadband near‐infrared (NIR) spectroscopy has gained significant attention due to its versatile application in various fields. In the realm of NIR phosphors, Fe 3+ ion is an excellent activator known for its nontoxic and harmless nature. In this study, we prepared an Fe 3+ ‐activated SrGa 12 O 19 (SGO) NIR phosphor and analyzed its phase and luminescence properties. Upon excitation at 326 nm, the SGO:Fe 3+ phosphor exhibited a broadband emission in the range 700–1000 nm, peaking at 816 nm. The optical band gap of SGO:Fe 3+ was evaluated. To enhance the long‐lasting phosphorescence, an oxygen vacancy‐rich SGO:Fe 3+ (V O ‐SGO:Fe 3+ ) sample was prepared for activation. Interestingly, the increase in the oxygen‐vacancy concentration indeed contributed to the activation of persistent luminescence of Fe 3+ ions. The V O ‐SGO:Fe 3+ sample has a long duration and high charge storage capacity, allowing it to perform efficiently in various applications. This work provides the foundation for further design of Cr 3+ ‐free PersL phosphors with efficient NIR PersL.