Supramolecular Assembly of Organic Cu(I) Halides with Efficient Broad Emission for Real‐Time Dynamic High‐Resolution White Light and X‐Ray Image Fusion and 3D Image Reconstruction

Abstract 0D organic Cu(I) halides have gained much attention for their fascinating optical properties. However, the narrow excitation in the UV region, strong afterglow, and poor stability severely limit their applications. Herein, three 0D organic Cu(I) halides of [Ba 2 (18‐crown‐6) 2 ]Cu 4 Cl 8 ·H 3 PO 3 ·6H 2 O (Compound‐Cl), [Ba(18‐crown‐6) 2 ]Cu 4 Br 6 ·CH 3 OH·H 2 O (Compound‐Br), and [Ba(18‐crown‐6) 2 ]Cu 4 I 6 ·H 3 PO 2 ·H 2 O (Compound‐I) are synthesized via supramolecular assembly. Compared to Compound‐Cl with poor stability and Compound‐Br with feeble photoluminescence quantum yield (PLQY), Compound‐I exhibits broadband blue light excitation characteristics, excellent stability, and efficient yellow emission with a PLQY of 99.4%. A high‐performance single‐component white light emitting diode is fabricated by coating Compound‐I powders on a 460 nm chip, which shows ultra‐high luminous efficiency of 106 lm W −1 . Under X‐ray irradiation, Compound‐I has a high light yield of 87 100 photons MeV −1 and a low detection limit of 45.9 nG air y s −1 . Moreover, the Compound‐I scintillation screen is made using a cold pressing method, which shows a spatial resolution of 20.6 lp mm −1 . Based on the remarkable optical properties and short decay lifetime of 1.9 µs of Compound‐I, the 3D image reconstruction of screws wrapped in capsule by combining real‐time dynamic white light and X‐ray image fusion, as well as multi‐angle imaging is successfully demonstrated.