Robust singlet fission process in strong absorption π-expanded diketopyrrolopyrroles
Long Wang, Wenlin Jiang, Shaoting Guo, Senhao Wang, Mengfan Zhang, Zuyuan Liu, Guo‐Liang Wang, Yanqin Miao, Lingpeng Yan, Jiang‐Yang Shao, Yu‐Wu Zhong, Zitong Liu, Deqing Zhang, Hongbing Fu, Jiannian Yao
Abstract
a π-expanded strategy, we presented a new series of robust SF chromophores based on polycyclic DPP derivatives, Ex-DPPs. Compared to conventional DPP molecules, Ex-DPPs feature strong absorption with a fivefold extinction coefficient, good molecular rigidity to effectively restrain non-radiative deactivation, and an expanded π-skeleton which endow them with well-suited intermolecular packing geometries for achieving efficient SF process. These results not only provide a new type of high-efficiency SF chromophore but also address some basic guidelines for the design of potential SF materials targeting practical light harvesting applications.