Organic molecules with dual triplet-harvesting channels enable efficient X-ray scintillation and imaging  

作　　者：Lisi Zhan Yalun Xu Tianhao Chen Yang Tang Cheng Zhong Qianqian Lin Chuluo Yang Shaolong Gong 

机构地区：[1]Department of Chemistry,Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials,Wuhan University,Wuhan,China [2]Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan,China [3]Shenzhen Key Laboratory of New Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen,China

出　　处：《Aggregate》2024年第3期232-238,共7页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:52022071;Shenzhen Science and Technology Program,Grant/Award Number:ZDSYS20210623091813040。

摘　　要：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 delayedfluorescence(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 andflexible 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.

关 键 词：alkoxy chain engineering organic scintillators RADIOLUMINESCENCE room-temperature phosphorescence thermally activated delayedfluorescence X-ray imaging 

分 类 号：O62[理学—有机化学]