Facilely Fabricated Bright Lead‐Free Perovskite Cs3Cu2I5 Scintillator Film for High‐Definition X‐Ray Imaging. Issue 12 (8th September 2022) - Guo, Heng
Abstract : Scintillator is a critical component to detect high‐energy particles or rays, which is widely used in deep space exploration, security inspection, and nondestructive testing and medical diagnosis, such as X‐ray imaging and computed tomography (CT). However, the wider application of traditional inorganic and organic scintillators is limited by the complex operation process or poor adaptability to changeable environment, and there remains a demand to develop green and stable scintillators with high sensitivity and low detection limit. Herein, the one‐step preparation of lead‐free perovskite Cs3 Cu2 I5 scintillator film for high‐definition X‐ray imaging by conventional chemical vapor deposition method is reported. Cs3 Cu2 I5 demonstrates good stability and bright‐blue emission at 445 nm and superhigh photoluminescence quantum yield (85.14%). Importantly, upon X‐ray irradiation, the Cs3 Cu2 I5 perovskite film exhibits light yield (≈39 251 photons MeV −1 ) as high as two times of the commercially available Ce:LuAG single‐crystal scintillator (≈22 000 photons MeV −1 ). Furthermore, the practical demonstration for a bamboo stick and insect specimens illustrates sensitive scintillation response to X‐ray signals with superior linearity and high‐quality images in X‐ray photography and CT. Overall, Cs3 Cu2 I5 film provides nontoxicity, high radioluminescence intensity, and good stability, it can be regarded as a competitive material for X‐ray imaging. Abstract : Lead‐free Cs3 Cu2 I5 scintillator films are prepared by chemical vapor deposition in one step and subsequently utilized as X‐ray screens for imaging. Polycrystalline scintillator films exhibit excellent optical properties and stability. Light yield and lowest detectable dose rate are superior to commercial Ce:LuAG. In addition to this, high‐definition X‐ray projections and CT images are expected to be used for medical diagnosis.