Ultra-flexible and highly sensitive scintillation screen based on perovskite quantum dots for non-flat objects X-ray imaging

A flexible and highly sensitive scintillation screen is urgently expected for X-ray imaging technology, especially for non-flat, flexible objects in medical and industrial applications. Here, we report a sandwich structure of polymer-perovskite quantum dots-polymer (PPP) scintillation screen. The outer polymer layer provides high mechanical stability and encapsulation for the internal perovskite quantum dots active layer. The relative light output remains 93 +/- 0.5% of its initial value after bending cycles up to 600 with a bending radius down to 2.5 mm. This PPP scintillation screen exhibits ultra-sensitivity to low energy X-ray with a detection limit of 1.57nGy(air)/s and fast decay time of 63.7ns. Well-resolved X-ray images are recorded with a common digital camera with a spatial resolution of 5.35 lp/mm at MTF 1/4 0.3 under the exposure dose of 12 mu Gy(air), which is much lower than the requirement of medical applications. These features demonstrate that this flexible scintillation screen can be applied for non-flat X-ray imaging applications under low-dose X-ray exposure. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A sandwich structure PPP scintillation screen with high mechanical stability and maintained high relative light output after bending cycles up to 600 times is reported. This screen exhibits ultra-sensitivity to low energy X-ray, fast decay time, and can produce clear X-ray images under low-dose X-ray exposure.