Abstract
Flexible copper halide films of 400 cm2 area were fabricated with outstanding mechanical stability, excellent film uniformity, nearly 100% photoluminescence quantum yields, and resistance to water and heat. The re-absorption-free X-ray imaging scintillators engineered based on these films exhibit superior scintillation performance with a detection limit as low as 48.6 nGy/s and 17 lp/mm X-ray imaging resolution, representing the highest imaging resolution for powder-based screens.
Highlights
X -ray imaging scintillation is a critical technology for medical diagnosis as well as industrial and security inspection.[1]
Lead halide perovskite X-ray imaging scintillators have attracted a great deal of attention since the initial report of using all-inorganic CsPbX3 (X = I−, Br−, Cl−, or mixed halides) solution-processed nanocrystals as multicolor scintillators.[2]
The lead-free Cs3Cu2I5 perovskite-related compound has emerged as a promising candidate for X-ray scintillators because it is eco-friendly and has a high light yield.[7−9] By virtue of its low-dimensional electronic structure, the Cs3Cu2I5 can form self-trapped excitons (STEs) due to the lattice’s Jahn−Teller distortion.[1,10,11]
Summary
X -ray imaging scintillation is a critical technology for medical diagnosis as well as industrial and security inspection.[1]. Stokes shift between emission and absorption spectra renders reabsorption-free candidate materials for high-performance X-ray imaging scintillators.
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