零维金属卤化物(C24H20P)CuI2的发光性能及X射线成像OA北大核心CSTPCD

Perovskite scintillator materials are widely used in the fields of medical CT,industrial safety and non-destructive testing.As a new generation of high-performance perovskite materials,copper-based(Ⅰ)metal halides have received widespread attention from researchers.This paper uses a simple antisolvent method to prepare a new type of copper-based scintillator(C24H20P)CuI2(C24H20P = tetraphenylphosphine).(C24H20P)CuI2 displays broad-band yellow luminescence with a high photoluminescence quantum yield(PLQY)of 45.84%and a large Stokes shift of 148 nm under blue light excitation at 414 nm.High PLQY and negligible self-absorption enable(C24H20P)CuI2 to exhibit impressive scintillation performance under X-ray excitation,with a light yield of～21 000 photons/MeV and a detection limit as low as 0.869 μGy/s,which is less than the medical radiation limit of 5.5 μGy/s.In addition,(C24H20P)CuI2 exhibits extraordinary thermal stability and can withstand high temperatures up to 415℃.The excellent luminescence properties ensure that(C24H20P)CuI2-based flexible films can be prepared by mixing it with poly-dimethylsiloxane(PDMS)for X-ray imaging,which has a great potential in the field of X-ray detection and imaging.This work highlights the multiple advantages of hybrid copper iodide halide as a highly desirable X-ray scintillator with low toxicity and cost,high light yields and good thermal stability,providing a promising solution for copper-based iodide scintillators in high-quality X-ray imaging.