Supramolecular‐Assembled Chiral Cu(I) Halide Scintillators With Near‐Unity Cyan Photoluminescence for High‐Resolution X‐Ray Imaging

ABSTRACT Chiral organic‐inorganic hybrid copper(I)‐based halides have attracted intense attention in optoelectronics due to their non‐toxicity and high photoluminescence quantum yields (PLQYs). Nevertheless, the simultaneously realizing outstanding scintillation performance and circularly polarized luminescence (CPL) remains challenging. Herein, we employed a supramolecular self‐assembly strategy, in which crown ether was anchored to the A‐site cation, and successfully synthesized zero‐dimensional chiral R / S ‐DAP(18‐crown‐6) 2 Cu 2 I 4 ( R / S ‐DAP = R / S ‐diaminopropane) halide scintillators. The coordination of crown ether ligands with amine groups formed large cations, facilitating the formation of [Cu 2 I 4 ] 2− units with effective CPL and near‐unity PLQYs. Furthermore, exceptional x‐ray absorption and responsivity were achieved, resulting in a light yield of 187835 photons MeV −1 , which is a new record among chiral copper(I)‐based halides. The scintillators also exhibited excellent self‐powered x‐ray detection performance, and the flexible scintillation films enabled spatial resolution of up to 18 lp mm −1 in x‐ray imaging. This work provides a new strategy for the design of chiral copper(I)‐based metal halide materials with high‐performance x‐ray detection and imaging capabilities.