Thermally Activated Delayed Fluorescence Coinage Metal Cluster Scintillator

X-ray scintillators are widely used in medical imaging, industrial flaw detection, security inspection, and space exploration. However, traditional commercial usually associated with a high use cost because of their substantial toxicity easy deliquescence. In this work, an atomically precise Au–Cu cluster scintillator (1) thermally activated delayed fluorescence (TADF) property was facilely synthesized, which is environmentally friendly highly stable to water oxygen. The TADF 1 endows it ultrahigh exciton utilization rate. Combined the effective absorption caused by heavy-atom effect limited nonradiative transition close packing crystal state, exhibits excellent radioluminescence property. Moreover, has good processability for fabricating large, flexible thin-film device (10 cm × 10 cm) high-resolution can reach 40 μm (12.5 LP mm–1). properties mentioned earlier make coinage metal promising as substitute scintillators.