近日，郑州大学单崇新团队研究了具有明亮单重态-三重态混合自捕获激子的可伸缩 X 射线闪烁体。该项研究成果发表在2025年7月22日出版的《光：科学与应用》杂志上。

具有高透明度和高光子产量的尺寸可扩展 X 射线闪烁体允许以更高的精度和细节成像大型物体。溶液可处理闪烁体通常由量子点（QDs）制成，是高效闪烁应用的有前景的候选者。然而，基于量子点闪烁体的有限尺寸和低透明度导致需要高分辨率的大型物体的 X 射线成像效率较低。

研究组展示了一个米尺度的ZnO QD闪烁体，其可见光范围透过率超过96%，具有明亮的单重态-三重态混合自捕获激子（STEs）。单重态激子和三重态激子的量子产率分别为44.7%和26.3%。得益于大的斯托克斯位移和明亮的三重态激子，闪烁体具有可忽略不计的自吸收和提高的光子产量。此外，闪烁体表现出交换不变性，在交换量子点坐标(r)时表现出相同的光学性能。该闪烁体具有明亮的单线-三重态混合STEs和高透明度，可在米尺度上实现每毫米42线对（42 lp mm^-1）的高分辨率x射线成像。

此外，该研究实现了 5000 cm²大面积 X 射线成像以及实时动态 X 射线成像演示。其 X 射线探测的最低可检测剂量率低至 37.63 ± 0.4 nGy·s^-1。研究组报道了一种具有明亮的单重态-三重态混合自陷激子 (STEs) 的新型大尺寸透明闪烁体，彰显了其在高分辨率、大尺寸物体 X 射线成像中的应用潜力。

附：英文原文

Title: Scalable X-ray scintillators with bright singlet-triplet hybrid self-trapping excitons

Author: Song, Shi-Yu, Gao, Chao-Jun, Zhou, Rui, Wang, Bing-Zhe, Zhao, Wen-Bo, Cao, Qing, Hu, Yan-Wei, Dong, Lin, Liu, Kai-Kai, Shan, Chong-Xin, Song, Shi-Yu, Gao, Chao-Jun, Zhou, Rui, Wang, Bing-Zhe, Zhao, Wen-Bo, Cao, Qing, Hu, Yan-Wei, Dong, Lin, Liu, Kai-Kai, Shan, Chong-Xin

Issue&Volume: 2025-07-22

Abstract: Size-scalable X-ray scintillators with high transparency and robust photon yield allow for imaging large objects with greater precision and detail. Solution-processable scintillators, typically crafted from quantum dots (QDs), are promising candidates for highly efficient scintillation applications. However, the restricted size and low transparency in QD-based scintillators lead to less efficient X-ray imaging for large objects requiring high resolution. Herein, we demonstrate a meter-scale ZnO QD scintillator with a visible range transmittance exceeding 96%, featuring bright singlet-triplet hybrid self-trapping excitons (STEs). The quantum yields (QYs) of singlet excitons and triplet excitons are 44.7% and 26.3%. Benefiting from a large Stokes shift and bright triplet excitons, the scintillator has a negligible self-absorption and elevated photon yields. Additionally, the scintillator exhibits exchange invariance, demonstrating identical optical performance upon exchanging the coordinates (r) of the QDs. Featuring bright singlet-triplet hybrid STEs and high transparency, the scintillator achieves high resolution X-ray imaging of 42-line pairs per millimeter (42lpmm1) at a meter scale. Moreover, demonstrations of 5000cm2 X-ray imaging and real-time dynamic X-ray imaging are presented. The lowest detectable dose rate for X-ray detection is as low as 37.63±0.4nGys1. This work presents a novel sizable and transparent scintillator with bright singlet-triplet hybrid STEs, showcasing their potential in high-resolution and sizable object X-ray imaging.

DOI: 10.1038/s41377-025-01869-z

Source: https://www.nature.com/articles/s41377-025-01869-z