Template-Assisted Fabrication of Flexible Perovskite Scintillators for X-Ray Detection and Imaging
Template-Assisted Fabrication of Flexible Perovskite Scintillators for X-Ray Detection and Imaging
复制标题
用于 X 射线检测和成像的柔性钙钛矿闪烁体的模板辅助制造
DOI：
10.1002/adom.202300169
复制
发表时间：
2023
影响因子：
9
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Li Y
金属卤化物钙钛矿最近已成为电离辐射探测装置的特殊闪烁体材料。它们的化学成分由具有高原子序数的元素组成，导致它们具有高衰减系数。它们的高衰减系数，结合其优异的光电性能，多功能化学可调谐性，以及简便和低成本的制造工艺，使其成为理想的闪烁体材料。然而，现有的基于钙钛矿的制冷剂存在材料稳定性差的问题，特别是在潮湿的气氛中。此外，目前的钙钛矿膜具有已经针对光致发光优化的形态，这导致相对长的电荷载流子寿命，这是对快速闪烁有害的性质。此外，现有的基于钙钛矿的增透剂的报道已经显示出有限的空间分辨率，这是由于来自钙钛矿晶粒的大聚集体的光散射引起的较差的透光率。为了解决这些问题，这项工作引入了一种基于模板辅助原位聚合的方法来制备钙钛矿/聚合物复合材料，同时减少余辉效应，提高钙钛矿稳定性，并具有工业规模。然后将优化的钙钛矿晶体纳入X射线检测设备中，以研究检测性能和设备稳定性。与现有的商业闪烁体相比，钙钛矿闪烁体显示出用于成像的上级检测性能指标，表明钙钛矿在下一代、大面积和柔性闪烁屏方面具有巨大潜力。
Metal halide perovskites have recently emerged as exceptional scintillator materials for ionizing radiation detection devices. Their chemical composition consists of elements with high atomic numbers, leading them to have a high attenuation coefficient. Their high attenuation coefficient, in combination with their excellent optoelectronic properties, versatile chemical tunability, and facile and low‐cost fabrication processes, makes them the ideal scintillator material. However, existing perovskite‐based scintillators suffer from poor material stability, especially in humid atmospheres. Moreover, current perovskite films have morphologies that have been optimized for photovoltaics, which results in the relatively long charge carrier lifetimes, a property that is detrimental for fast scintillation. Furthermore, existing reports of perovskite‐based scintillators have shown limited spatial resolution due to poor light transmittance that arises from light scattering from large aggregates of perovskite grains. To address these issues, this work introduces a template‐assisted in situ polymerization‐based process to prepare perovskite/polymer composite scintillators that simultaneously reduces afterglow effects, improves perovskite stability, and is industrially scalable. The optimized perovskite scintillators are then incorporated into X‐ray detection devices to investigate detection performance and device stability. Compared with existing commercial scintillators, the perovskite scintillators show superior detection performance metrics for imaging, indicating the great potential of perovskites for next‐generation, large‐area, and flexible scintillation screens.