Cuprous Halides Scintillator via Anion‐Substitution Strategy for X‐Ray Dynamic Imaging

Abstract The advancement of dynamic X‐ray imaging demands scintillators that combine high light yield, rapid decay kinetics, environmental sustainability, and operational stability. In recent years, low‐dimensional copper‐based halides, as a representative efficient luminescent material, shows great potential as a scintillator for X‐ray detection. Herein, a 0D organic copper(I) halide (TBA)CuI 1.6 Br 0.4 (TBA = C 16 H 36 N) single crystal scintillator is prepared through an anion‐substitution strategy. The addition of bromine increases the structural rigidity, reducing electronic repulsion between copper and iodine atoms and minimizing photon loss through non‐radiative recombination pathways, resulting in an impressive photoluminescence quantum yield of 91.93%. More importantly, it demonstrates an enhanced X‐ray response with a high light yield (45 369 photons MeV −1 ), a perfect linear relationship with the dose rate, a detection limit of 0.12 µGy s −1 , and a spatial resolution of 13.8 lp mm −1 . Moreover, after 60 on‐off cycles of X‐ray irradiation, it shows negligible intensity attenuation, indicating good operational stability. This study presents a highly emissive 0D organic copper(I) halide scintillator and highlights its potential in medical diagnostics and dynamic X‐ray imaging applications.