Near-infrared organic scintillators for efficient X-ray imaging via singlet and triplet to doublet energy transfer  

基于单重态和三重态到双重态的能量转移构建的高效近红外有机X射线成像闪烁体

作　　者：Jiawei He Tianhao Chen Bin Yu He Zhang Zhengin Jia Qianqian Lin Shaolong Gong 何家伟;陈天浩;余斌;张贺;贾正林;林乾乾;龚少龙

机构地区：[1]College of Chemistry and Molecular Sciences,Hubei Key Lab on Organic and Polymeric Optoelectronic Materials,Wuhan University,Wuhan 430072,China [2]Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan 430072,China

出　　处：《Science China Materials》2025年第4期1057-1063,共7页中国科学(材料科学)(英文版)

基　　金：financial support from the National Natural Science Foundation of China(52022071)。

摘　　要：Near-infrared(NIR)organic scintillating materials are in high demand in a variety of fields,such as radiography,X-ray radiation therapy,and medical diagnosis.However,efficient organic NIR materials with high X-ray absorption are rarely reported.Here,we developed NIR organic X-ray imaging scintillators based on a typical organic radical with emission from a spin doublet excited state.The energy transfer strategy from thermally activated delayed fluorescence(TADF)sensitizers to the radical emitter was exploited to enhance X-ray absorption capability.The optimized scintillators with an Au(III)-TADF complex as the sensitizer exhibited intense NIR radioluminescence peaking at 746 nm upon X-ray excitation.High-quality X-ray imaging with a high spatial resolution of 15.3 lp mm-1 was demonstrated,suggesting great potential for real applications.This work provides an effective strategy for the development of NIR organic scintillators.近红外(NIR)有机闪烁体材料在放射成像、X射线诊疗和医学诊断等多个领域需求旺盛.然而,具有高X射线吸收能力的有机NIR材料鲜有报道.在本工作中,我们基于具有双重态发射的典型有机自由基材料,开发了一类新型的近红外有机X射线闪烁体.我们利用从热活化延迟荧光敏化剂到自由基发光材料的高效能量转移策略来增强该自由基材料对X射线的吸收能力.在X射线激发下,以Au(Ⅲ)-TADF配合物作为敏化剂、以发光自由基TTM-3PCz作为客体的闪烁体展现出746 nm的NIR辐射发光.该体系获得了高质量的X射线成像,实现了高达15.3 lp mm-1的空间分辨率,显示出较大的实际应用潜力.本研究为近红外有机闪烁体材料的开发提供了一种有效的策略.

关 键 词：organic scintillators organic radical doublet emission RADIOLUMINESCENCE NEAR-INFRARED 

分 类 号：O482.31[理学—固体物理]