In situ preparation of ultrastable and flexible BA₂PbBr₄ nanocrystal films for X-ray imaging

Flexible imaging technology has attracted increasing interest in medical diagnosis, security inspection and non-destructive testing due to its operability for curved objects. Herein, we report an in situ fabrication strategy for a flexible BA₂PbBr₄ NC@PMMA film with an extraordinary stability and a high mechanical flexibility. This flexible film retains 90% and 97% of the initial radioluminescence (RL) intensity value after being immersed in water for 5 days and 600 cycles of bending, respectively. Furthermore, the scintillation film exhibits a favorable linear response correlation with the X-ray dose rate and a fast decay time of 2.07 ns. A series of well-resolved X-ray images of flat objects with a high spatial resolution of 5.5 lp mm⁻¹ are achieved, which can satisfy the demand of many application scenarios. The non-distortion X-ray image is successfully recorded for nonplanar objects using this flexible scintillation film. Thus, these results provide a feasible route for perovskite use in flexible medical imaging.