Chiral Hybrid Cu(I) Halide Scintillation Films with Polarization‐Engineered Light Management for High‐Resolution X‐ray Imaging

Abstract Scintillators are typically based on achiral structures, where the emitted light propagates isotropically, resulting in significant optical crosstalk and reduced image fidelity in X‐ray imaging. In this study, we design the synthesis of a pair of chiral hybrid Cu(I) halide scintillators, R‐2‐MePiCuI and S‐2‐MePiCuI (R/S‐2‐MePi = R/S‐2‐methylpiperazine), exhibiting near‐unity photoluminescence quantum yield (PLQY) of 99.08% ± 0.21% and 98.38% ± 0.19%, respectively, along with distinct circularly polarized luminescence (CPL) and dissymmetry factors ( g lum ) of + 0.82 × 10 −2 and −0.67 × 10 −2 . Furthermore, high‐quality chiral Cu(I) halide thin films have been fabricated using a multi‐source vacuum deposition (MSVD) technique, enabling dense and uniform scintillating layers. A polarized system is developed by combining the chiral thin film scintillator with polarization optics, enabling directional radioluminescence propagation and suppressing optical crosstalk. The resulting device achieves a high spatial resolution of 20 lp mm −1 and an ultralow detection limit of 99.22 nGy s −1 . These findings establish chiral hybrid Cu(I) halides as promising candidates for high‐resolution X‐ray imaging with synergetic light management.