Flexible, fast decay and stable X-ray imaging through the pixelated CsCu2I3/PDMS scintillation array

Copper halides are widely used in X-ray imaging because of their green non-toxicity, excellent optical properties and simple preparation. Cs 3 Cu 2 I 5 has a higher high photoluminescence quantum yield (PLQY) than CsCu 2 I 3 , but its fluorescence decay time is up to 1.65 μs. Herein, we report a green non-toxicity and low-cost antisolvent preparation of CsCu 2 I 3 microcrystals with bright yellow emission. The fluorescence decay time of the product is as fast as 123 ns and the PLQY is 11.36 %. At the same time, the light yield obtained by this method is 13,454.3 photons/MeV, which is about twice that of the commercial scintillator single crystal Bi 4 Ge 3 O 12 (BGO). In order to avoid transverse light scattering of scintillation films and improve the spatial resolution of X-ray imaging, we also propose a template-assisted and negative pressure filling method for the pixelated CsCu 2 I 3 scintillation array based on Polydimethylsiloxane (PDMS) micropore template. The crosstalk of scintillation light between each column is effectively suppressed, and the spatial resolution of the pixelated CsCu 2 I 3 /PDMS scintillation array is improved. In conclusion, the CsCu 2 I 3 microcrystals with fast decay, high optical properties and good stability, as well as the pixelated CsCu 2 I 3 /PDMS scintillation array that further improve spatial resolution by avoiding transverse scattering of light, provide a feasible solution for guiding copper halide materials as scintillators for X-ray detection and imaging.