Near-unity broadband luminescent cuprous halide nanoclusters as highly efficient X-ray scintillators
Source abstract
Abstract
闪烁体可以将高能辐射转化为可见光, 作为一种光电功能材料 已经广泛应用于各种放射探测领域. 虽然三维Pb基钙钛矿纳米晶可以 开发为X射线闪烁体材料, 但是其较低的光产额和铅毒性问题在一定程 度上限制了其应用. 为解决这一问题, 本文重点关注零维金属卤化物发 光材料, 合成了一系列基于孤立[Cu4X6]2−纳米团簇的零维卤化物, 并将 其开发应用为闪烁体发光材料. 在紫外线或蓝光激发下, 该卤化物纳米 团簇均显示出宽带光发射, 发光颜色可覆盖绿色、橙色到红色, 并且具 有近乎100%的光量子产率和较大的Stokes位移(>1.3 eV). 特别突出的 是, 该类卤化物纳米团簇由于较高的发光量子产率、较小的光学自吸 收和较强的X射线衰减效率, 表现出优异的X-射线闪烁发光性能, 光产 额最高可达到24,240 photons MeV−1. 材料的闪烁发光强度与X射线剂 量呈现线性关系, 检测范围较宽, 且检测极限(0.7563 µGyair s−1)远低于 常规医学诊断所要求的计量(5.5 µGyair s−1). X-射线成像结果表明该纳 米团簇余晖衰减时间较短(1.3 ms), 空间分辨率较高(14.83 lp mm−1), 在医学成像等领域具有潜在的应用价值. 该项工作表明, 亚铜卤化物纳 米团簇具有高效、稳定、无毒、发光效率高等优点, 有望成为一种优 异的新型闪烁体发光材料.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
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