Lisi Zhan, Yalun Xu, Tianhao Chen, Yang Tang, Cheng Zhong, Qianqian Lin, Chuluo Yang, Shaolong Gong
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引用次数: 0
摘要
最近,有机闪烁体在 X 射线探测领域获得了相当多的关注,因为它们在生物医学射线照相和安全检查方面具有潜在的应用价值。然而,有机闪烁体对 X 射线的微弱吸收和/或对激子的低效利用限制了其发展和商业化。目前,高性能的 X 射线有机闪烁体还很稀缺,而具有双三重捕获通道的有机闪烁体还没有被探索过。在此,我们利用不同的烷氧基链操纵分子堆积模式,开发出几种概念验证型砜基有机分子(C1-C7)。这些材料在聚集状态下表现出热激活延迟荧光(TADF)和室温磷光(RTP)的双重三重收集通道。令人鼓舞的是,这些分子在 X 射线刺激下显示出不同的辐射发光。其中,C6 的光产率最高,达到 16,558 光子 MeV-1。此外,聚合态和单分子水平都显示了清晰的 X 射线图像。刚性和柔性闪烁体屏幕的空间分辨率分别达到了 15.0 和 10.6 线对/毫米(lp mm-1),超过了大多数已报道的有机和传统无机闪烁体。这些结果凸显了具有 TADF 和 RTP 性质的有机分子在高效 X 射线闪烁和成像方面的巨大潜力。
Organic molecules with dual triplet-harvesting channels enable efficient X-ray scintillation and imaging
Organic scintillators have recently gained considerable attentions in X-ray detection for their potential applications in biomedical radiograph and security inspection. However, the weak X-ray absorption and/or inefficient exciton utilization have limited the development and commercialization of organic scintillators. Currently, high-performance X-ray organic scintillators are scarce and organic scintillators with dual triplet-harvesting channels have not been explored before. Here, we develop several proof-of-concept sulfone-based organic molecules, C1–C7, using different alkoxy chains to manipulate molecular packing mode. These materials exhibit dual triplet-harvesting channels of thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) in aggregated state. Inspiringly, these molecules display distinct radioluminescence under the X-ray stimulation. Among them, C6 behaves the highest light yield of 16,558 photons MeV−1. Moreover, clear X-ray images are demonstrated in both aggregated state and single-molecule level. High spatial resolutions of 15.0 and 10.6 line pairs per millimeter (lp mm−1) are achieved for rigid and flexible scintillator screens, exceeding most reported organic and conventional inorganic scintillators. These results highlight the great potential of organic molecules with TADF and RTP nature for efficient X-ray scintillation and imaging.