Rapid and Large‐Scale Synthesis of Ultra‐Stable and Highly Efficient Copper(I)‐Based Halides Microrods Scintillator for High‐Resolution X‑Ray Imaging

Copper(I)‐based halide scintillators have emerged as formidable candidates for X‐ray imaging, spanning applications from industrial inspection to medical diagnostics. However, achieving high‐performance scintillation screens remains challenging due to the difficulty in controlled synthesis of low‐dimensional copper(I)‐based halides, which often suffers from luminescence quenching and trap‐state‐induced instability. Herein, we report the successful synthesis of stable, one‐dimensional (1D) Cu 2 I 2 (bpp) 2 microrods via a facile chemical precipitation method. These microrods exhibit a broad blue‐green emission with a near‐unity photoluminescence quantum yield (PLQY) and exceptional structural stability. The resulting scintillator delivers a high light yield (∼25568 photons MeV −1 ) and an ultra‐low detection limit (127.97 nGy s −1 ), and maintains robust resistance to humidity and prolonged radiation. Furthermore, by incorporating these microrods into a polystyrene (PS) matrix, we fabricated large‐area ultrathin Cu 2 I 2 (bpp) 2 @PS composite scintillation screens. Benefiting from the unique 1D morphology which suppresses lateral light scattering, the screens achieve an outstanding spatial resolution exceeding 34.3 lp mm −1 , significantly surpassing conventional commercial scintillators. This work provides a strategic pathway for developing ultra‐high‐resolution X‐ray imaging screens based on low‐dimensional copper(I)‐based halides for advanced radiography and non‐destructive testing.