Reproducible X‐ray Imaging with a Perovskite Nanocrystal Scintillator Embedded in a Transparent Amorphous Network Structure

Abstract Metal halide perovskites are emerging scintillator materials in X‐ray detection and imaging. However, the vulnerable structure of perovskites triggers unreliable performance when they are utilized in X‐ray detectors under cumulative dose irradiation. Herein, a self‐limited growth strategy is proposed to construct CsPbBr 3 nanocrystals that are embedded in a transparent amorphous network structure, featuring X‐imaging with excellent resolution (≈16.8 lp mm −1 ), and fast decay time (τ = 27 ns). Interestingly, it is found that the performance degradation of the scintillator, caused by the damage from high‐dose X‐ray irradiation, can be fully recovered after a facile thermal treatment process. This indicates a superior recycling behavior of the explored perovskites scintillator for practical applications. The recoverability of the as‐explored scintillator is attributed to the low atom‐migration rate in the amorphous network with high‐viscosity (1 × 10 14 cP). This result highlights the practical settlement of the promising perovskites for long‐term, cost‐effective scintillator devices.