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Mn 4+ -activated phosphors are emerging as a novel class of deep red/near-infrared emitting persistent luminescence materials for medical imaging as a promising alternative to Cr 3+ -doped nanomaterials. Currently, it remains a challenge to improve the afterglow and photoluminescence properties of these phosphors through a traditional high-temperature solid-state reaction method in air. Herein we propose a charge compensation strategy for enhancing the photoluminescence and afterglow performance of Mn 4+ -activated LaAlO₃ phosphors. LaAlO₃:Mn 4+ (LAO:Mn 4+ ) was synthesized by high-temperature solid-state reaction in air. The charge compensation strategies for LaAlO₃:Mn 4+ phosphors were systematically discussed. Interestingly, Cl - /Na⁺/Ca 2+ /Sr 2+ /Ba 2+ /Ge 4+ co-dopants were all found to be beneficial for enhancing LaAlO₃:Mn 4+ luminescence and afterglow intensity. This strategy shows great promise and opens up new avenues for the exploration of more promising near-infrared emitting long persistent phosphors for medical imaging.

LaAlO3:Mn4+ as Near-Infrared Emitting Persistent Luminescence Phosphor for Medical Imaging: A Charge Compensation Study