Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.017
Publication date: 18th July 2023
Growing demand for ultralow detection limits in medical radiography, high-energy physics, and security screening has spurred extensive research on X-ray imaging scintillators and detectors. Current market offerings of high-performance ceramic scintillators require harsh and costly fabrication techniques. In contrast, perovskite nanosheets and copper nanoclusters offer unique optical properties and high X-ray absorption cross-sections, making them promising alternatives. This presentation will discuss the room-temperature synthesis of colloidal CsPbBr3 nanosheets, exhibiting superior scintillation performance due to efficient energy transfer processes between stacked thin and thick nanosheets. Moreover, by combining CsPbBr3 perovskite nanosheets with thermally activated delayed fluorescence (TADF), reabsorption-free organic X-ray imaging scintillators were developed, offering a low detection limit of 38.7 nGy/s and exceptional imaging resolution. Cu-based halide nanoclusters composed of Cu4I6 nanoparticles and nanorods exhibit ultrahigh photoluminescence quantum yields, low detection limits of 96.4 and 102.1 nGy/s - about 55 times lower than standard medical diagnosis doses (5.5 μGy s–1) - and extraordinary X-ray imaging resolutions exceeding 30 lp/mm, more than doubled compared to conventional CsI:Tl and Ga2O2S:Tb scintillators. This research paves new avenues for developing high-resolution X-ray imaging screens based on Cu-based halide nanoclusters for applications in medical radiography and non-destructive detection.
This work was supported by King Abdullah University of Science and Technology (KAUST).
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