Precision X-Ray Time-Lapse Flexible Imaging from Fluoride Nanocrystals with the Constructed Deep Traps

摘要

X-ray time-lapse imaging allows for precise radiographic imaging of the itemafter X-ray has been terminated, which is important for simplifying legacyX-ray detectors and avoiding health hazards caused by ionizing radiationduring the imaging process. However, the premature discharge of carriersfrom shallow traps at room temperature over time leads to the loss of imaginginformation, making an accurate representation of the recorded informationto achieve accurate time-lapse imaging still a challenge. Here, it isdemonstrated that monodispersed NaLuF4: Tb~（3+） nanocrystals with thereplacement of Na+ by Cs~+ ions in the lattice matrix realize a superior X-raytime-lapse imaging. It is found that the incorporation of Cs~+ ions amplifiesthe deep trap storage capacity, which ensures the stable presence of carriersunder thermal perturbation at room temperature. Imaging information with aspatial resolution of 12.0 lp mm~（?1） can be accurately represented even afterthe irradiation of the X-ray has been terminated for 192 h. X-ray time-lapseimaging not only allows accurate reading of long-term stored imaginginformation but also endows the visualization of X-ray imaging independentof the dangerous radiation, which will offer great opportunities for X-rayinspection on a larger scale.