Lighting the Invisible: Tailoring Hot Exciton AIE Scintillators via Heavy-Atom Engineering for X-ray Detection
Hong Chen , Minghui Zhang , Ziyu Cui , Guiyi Yang , Jingwen Chen , Zonghang Liu , Yifan Wang , Huilin Xie , Haoran Lin , Xiuze Hei , Jianquan Zhang , Ben Zhong Tang
Chinese Journal of Chemistry ›› 2025, Vol. 43 ›› Issue (23) : 3093 -3101.
Hot exciton organic scintillators, a class of materials that utilize triplet excitons through high-energy reverse intersystem crossing (hRISC), have attracted significant attention due to their high exciton utilization efficiency and ultrafast fluorescence lifetime. However, the limited X-ray absorption capacity of organic molecules has restricted the diversity of organic scintillators exhibiting high radioluminescence intensity. In this study, we demonstrate strong scintillation emission by constructing a simple D-A architecture with heavy- atom modification on the donor periphery, while emphasizing the critical balance between photoluminescence quantum yield (PLQY) and X-ray absorption capability. Notably, the crystalline powder of 4-(benzo[c][1,2,5]thiadiazol-4-yl)-N,N-bis(4-bromophenyl)aniline (BT-TPA-2Br) achieves a maximum radioluminescence intensity 8.76 times that of anthracene and 1.75 times that of BGO (relative light yield of ∼33460 MeV−1.), along with a rapid decay lifetime of 5.37 ns. This work provides a straightforward molecular design strategy for developing hot exciton organic scintillators that simultaneously possess good solubility, crystallinity, and high radioluminescence intensity.
Hot exciton / Scintillator / Heavy atom / Aggregation-induced emission / X-ray detection / Radioluminescence / Halogenation / Crystallization
2025 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
/
| 〈 |
|
〉 |
PDF
