Excitonic-coupling enhancement in double π-helical dimers for highly efficient and robust circularly polarized luminescence
Abstract
Developing circularly polarized luminescence (CPL) materials with high brightness (BCPL) remains a central challenge, as it demands the synergistic optimization of both chiral response and luminescence efficiency. Through a comparative study of an N-annulated double π-helical perylene diimide dimer and its unmodified counterpart, this work demonstrates that strong excitonic coupling serves as a key strategy for achieving bright and robust CPL. The enhanced excitonic coupling promotes BCPL through a dual pathway: statically, it elevates the luminescence dissymmetry factor (glum) by markedly suppressing the electric transition dipole moment under H-aggregation while keeping the rotational strength essentially unchanged; dynamically, it suppresses excited-state symmetry-breaking charge transfer in polar dielectric environments, thereby sustaining a high photoluminescence quantum yield (ΦPL). Consequently, this work establishes the targeted enhancement of excitonic coupling as an effective design paradigm for developing high-brightness CPL materials with concurrently high glum and ΦPL.
Article Details
Journal Info
The Journal of Chemical Physics
American Institute of Physics
Authors (12)
Rui Jing
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology
Junji Zhao
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology
Yang Li
Jiangtao Chan
Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry
Yuhang Yang
Department of Chemistry
Yuanyuan Guo
Gang-Hua Deng
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology, Beijing University of Posts and Telecommunications (BUPT) 1 , Beijing 100876,
Hongmei Zhao
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology
Wei Jiang
Zhaohui Wang
Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry
Andong Xia
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology
Zhuoran Kuang
State Key Laboratory of Information Photonics and Optical Communications, and School of Physical Science and Technology