ABSTRACT The development of scintillators that combine strong X‐ray excited optical luminescence (XEOL) with minimal afterglow is pivotal for advancing dynamic X‐ray imaging applications. Herein, we report a facile strategy for the simultaneous optimization of scintillation properties in NaLuF 4 :Tb/Gd nanoscintillators (NSs) through precise control of co‐precipitation temperature. Elevating the reaction temperature from 300°C to 320°C yields a monotonic enhancement in XEOL intensity along with a significant reduction in X‐ray excited persistent luminescence (XEPL). This synergistic effect is attributed to temperature‐induced improvement in crystallinity and a substantial decrease in the number of charge‐trapping defects. The optimized NaLuF 4 :Tb/Gd NSs were fabricated into a flexible composite film, which exhibits excellent stability and enables high‐resolution (14.1 lp mm −1 ) dynamic X‐ray imaging. This work provides a scalable pathway for optimizing scintillation yield while suppressing afterglow in fluoride NSs.
Xu et al. (Tue,) studied this question.
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