ABSTRACT As pivotal functional materials for enhancing energy utilization efficiency, electron‐trapping materials (ETMs) have garnered significant scientific attention due to their exceptional energy harvesting and releasing capabilities. However, the radiative luminescence processes of ETMs are fundamentally constrained by the inherent defect stochasticity in matrix lattices. Herein, X‐ray‐induced defect regulation strategy in KMgF 3 have been developed to regulate the generation of K‐ and F‐vacancies ( and ), achieving dual‐band emission at 600 nm (X‐ray irradiation) and 460 nm (UV‐stimulated) through respective defect‐mediated luminescence pathways. Notably, it is found that trap‐state will reset and the luminescence recovers the initial radiative properties after a convenient thermal treatment process. Based on these results, the ratio in the material can be precisely regulated by adjusting the irradiation dose of X‐rays. The time‐delayed optical imaging and reprogrammable anti‐counterfeiting model have been constructed. Furthermore, based on such precise regulation, a novel approach for radiation dose detection is proposed. This work has established an innovative defect regulation in inorganic phosphors, opening up a new avenue for designing ETMs to achieve precise X‐ray detection.
Guo et al. (Sun,) studied this question.