Dong Mengyang, Lv Anqi, Zou Xin, Gan Nan, Peng Chenxi, Ding Meijuan, Wang Xiao, Zhou Zixing, Chen Huan, Ma Huili, Gu Long, An Zhongfu, Huang Wei
Frontiers Science Center for Flexible Electronics, MIIT Key Laboratory of Flexible Electronics (KLoFE), Northwestern Polytechnical University (NPU), Xi'an, 710072, P. R. China.
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, P. R. China.
Adv Mater. 2024 May;36(18):e2310663. doi: 10.1002/adma.202310663. Epub 2024 Jan 31.
Organic phosphorescent scintillating materials have shown great potential for applications in radiography and radiation detection due to their efficient utilization of excitons. However, revealing the relationship between molecule stacking and the phosphorescent radioluminescence of scintillators is still challenging. This study reports on two phenothiazine derivatives with polymorphism-dependent phosphorescence radioluminescence. The experiments reveal that molecule stacking significantly affects the non-radiation decay of the triplet excitons of scintillators, which further determines the phosphorescence scintillation performance under X-ray irradiation. These phosphorescent scintillators exhibit high radio stability and have a low detection limit of 278 nGys. Additionally, the potential application of these scintillators in X-ray radiography, based on their X-ray excited radioluminescence properties, is demonstrated. These findings provide a guideline for obtaining high-performance phosphorescent scintillating materials by shedding light on the effect of crystal packing on the radioluminescence of organic molecules.
有机磷光闪烁材料由于能有效利用激子，在射线照相和辐射探测领域展现出巨大的应用潜力。然而，揭示分子堆积与闪烁体磷光辐射发光之间的关系仍然具有挑战性。本研究报道了两种具有多晶型依赖性磷光辐射发光的吩噻嗪衍生物。实验表明，分子堆积显著影响闪烁体三重态激子的非辐射衰变，进而决定了X射线照射下的磷光闪烁性能。这些磷光闪烁体具有高辐射稳定性，检测限低至278 nGys。此外，基于其X射线激发的辐射发光特性，展示了这些闪烁体在X射线照相中的潜在应用。这些发现通过揭示晶体堆积对有机分子辐射发光的影响，为获得高性能磷光闪烁材料提供了指导。
