(1) Therefore, a high-performance scintillator material needs to meet at least two basic requirements: strong X-ray absorption and high photoluminescence quantum yield (PLQY). (1−6) In a typical X-ray scintillation process, X-ray absorption, photogeneration of charge carriers, and radiative carrier recombination are the key steps that lead to radioluminescence. X-ray imaging scintillators have been extensively used in the fields of medical diagnosis, defense security, and nondestructive inspection. We report a high-performance X-ray imaging scintillator based on a zero-dimensional organic copper halide-silicon arrays for applications in medical radiography and security screening. This design represents a new approach to fabricating high-performance X-ray imaging scintillators based on organic metal halides for applications in medical radiography and security screening. The pixelated CNCI-silicon array scintillation screen displays an impressive spatial resolution of 24.8 line pairs per millimeter (lp/mm) compared to the resolution of 16.3 lp/mm for CNCI-polymer film screens, representing the highest resolutions reported so far for organometallic-based X-ray imaging screens. Moreover, the spatial imaging resolution of the CNCI scintillator was further improved by using a silicon template due to the wave-guiding of light through CNCI-filled pores. In addition, an ultralow detection limit of 59.4 nGy/s was achieved, which is approximately 92 times lower than the dosage for a standard medical examination. In particular, we fabricated a CNCI/polymer composite scintillator with an ultrahigh light yield of ∼109,000 photons/MeV, representing one of the highest values reported so far for scintillation materials. Herein, the zero-dimensional organic copper halide (18-crown-6) 2Na 2(H 2O) 3Cu 4I 6 (CNCI) which exhibits negligible self-absorption and near-unity green-light emission was successfully deployed into X-ray imaging scintillators with outstanding X-ray sensitivity and imaging resolution. Lead-free organic metal halide scintillators with low-dimensional electronic structures have demonstrated great potential in X-ray detection and imaging due to their excellent optoelectronic properties.
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