Binaphthol diimide scintillators for X-ray imaging

被引:2
作者
Chen, Jingru [1 ,2 ]
Liu, Guangsheng [1 ]
Chen, Fuhai [1 ]
Chen, Yong [1 ]
Fang, Xin [1 ]
Chen, Hongming [2 ]
Lin, Mei-Jin [1 ,2 ]
机构
[1] Fuzhou Univ, Coll Chem, Fuzhou 350116, Peoples R China
[2] Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Peoples R China
基金
中国国家自然科学基金;
关键词
organic scintillators; molecular structures; crystal packing; fluorescence; X-ray imaging; CHARGE-TRANSFER; DETECTORS;
D O I
10.1007/s40843-024-2906-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Rylene diimides are an attractive class of organic dyes owing to their exceptional optical properties and optoelectronic applications. Herein, we extend their applications to the realm of X-ray imaging. The emissive 1,1 '-bi(2-naphthol-4,5-dicarboximide) (BiND-OH) and its phenyl/methyl derivatives, BiND-OPh and BiND-OMe, have been selected to investigate the structure-activity relationships between their crystal packing and X-ray scintillation properties. Single crystal X-ray diffraction results indicate that BiND-OH forms a tightly structured conformation with two interlocks by hydrogen bonding, leading to a charge transfer state and resulting in nearly non-scintillation. In contrast, the radioluminescence intensities of BiND-OPh and BiND-OMe have increased by about 73 and 537 times, respectively, owing to the disruption of hydrogen bonding control and the formation of a J-aggregation fraction dominated by pi-pi interactions. Remarkably, BiND-OMe displays superior scintillation properties, marked by reduced non-radiative transitions, attributed to greater pi-pi plane distances, extended slip distances, and diminished pi-plane overlap areas. It demonstrates a low detection limit of 70.68 nGy s(-1) and a short decay time of 4.37 ns. When applied to X-ray imaging, it produces a high spatial resolution of 11.0 lp mm(-1). This finding provides valuable insights into the profound impact of molecular structure and aggregation state on the organic scintillation properties.
引用
收藏
页码:2583 / 2589
页数:7
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