Diastereomeric Effect Modulates the Optical Activity of Benzo[ ghi ]perylenetriimides Microwire Arrays Toward High‐Performance Ultraviolet Circularly Polarized Light Detection
Zhiwei Wang, Chao Zhang, Wenkai Zhao, Zibo Meng, Ke Gao, Zhuofan Wang, Jinhang Liu, Sicheng Li, Kunning Jia, Pei Zhou, Hanfei Gao, Xiaobo Shang, Guankui LongABSTRACT
Ultraviolet circularly polarized light (UV‐CPL) has significant applications in chiral optoelectronics however its sensitive detection is hindered by the challenge of designing wide‐bandgap chiral organic semiconductors. Herein, we synthesized two diastereomeric benzo[ ghi ]perylenetriimides (( S,S,S )/( S,S,R )‐BPTI‐Ph) and assembled them into ordered microwire arrays. ( S,S,S )‐BPTI‐Ph microwire arrays show higher absorption dissymmetry factor ( g abs = 2.3 × 10 −3 ) than ( S,S,R )‐BPTI‐Ph microwire arrays ( g abs = 1.3 × 10 −3 ) at 365 nm. Theoretical calculations revealed this enhancement originates from the optimized angle between electric and magnetic transition dipole moments. The organic phototransistors based on ( S,S,S )‐BPTI‐Ph microwire arrays achieved high photocurrent dissymmetry factor ( g ph = 0.46), which was higher than that of ( S,S,R )‐BPTI‐Ph ( g ph = 0.16), representing one of the highest values among the reported UV‐CPL detectors. Furthermore, a 50 × 50 pixel high‐resolution UV‐CPL star pattern imaging was demonstrated based on the favorable CPL detecting properties of ( S,S,S )‐BPTI‐Ph microwire arrays. This work provides a rational design strategy for chiral organic materials with high‐performance UV‐CPL detection via diastereomeric effect.