Cao Ruo-Yu, Si Yu-Bing, Yang Qi, Gao Zi-Ying, Yuan Jia-Wang, Zhao Yi, Peng Qiu-Chen, Li Kai, Zang Shuang-Quan, Tang Ben Zhong
Tianjian Laboratory of Advanced Biomedical Sciences, Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Lab of Theoretical and Computational Chemistry, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Natl Sci Rev. 2025 Feb 12;12(5):nwaf045. doi: 10.1093/nsr/nwaf045. eCollection 2025 May.
Organic scintillators are among the most promising due to their inherent merits in terms of heavy metal-free constituents, synthesis designability, affordability of raw materials, and low usage costs. However, the limited X-ray excited luminescence (XEL) property of organic scintillators affects their application. To date, the main approaches for improving the XEL property of organic scintillators have focused on introducing heavy atoms to increase the absorbance of X-rays and establishing new luminescence pathways, such as thermally activated delayed fluorescence (TADF), to increase the exciton utilization efficiency. Even so, the XEL property of organic scintillators is not ideal compared with that of commercial inorganic scintillators. In this work, a highly stable charge separation (CS) state trap was introduced into the design of an organic scintillator. Combined with a unique thermally activated delayed phosphorescence (TADP) process, highly efficient capture and conversion of high-energy carriers are realized. As a result, the exciton generation efficiency dramatically increases, with an ultrahigh XEL intensity, and X-ray afterglow imaging at room temperature is achieved for the first time. This work provides a brand-new strategy for the design of high-performance organic scintillators.
有机闪烁体因其在无重金属成分、合成可设计性、原材料可承受性和低使用成本方面的固有优点而成为最有前途的材料之一。然而，有机闪烁体有限的X射线激发发光（XEL）性能影响了它们的应用。迄今为止，提高有机闪烁体XEL性能的主要方法集中在引入重原子以增加对X射线的吸收以及建立新的发光途径，如热激活延迟荧光（TADF），以提高激子利用效率。即便如此，与商用无机闪烁体相比，有机闪烁体的XEL性能仍不理想。在这项工作中，一种高度稳定的电荷分离（CS）态陷阱被引入到有机闪烁体的设计中。结合独特的热激活延迟磷光（TADP）过程，实现了对高能载流子的高效捕获和转换。结果，激子产生效率显著提高，具有超高的XEL强度，并首次实现了室温下的X射线余辉成像。这项工作为高性能有机闪烁体的设计提供了一种全新的策略。
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