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Interface-Confined Triplet Sensitization and Photon Upconversion in Pyrene-Tetracyanobenzene Charge-Transfer Cocrystals

Year: 2025
Type: article
Abstract: Micro-cocrystals of the intermolecular charge-transfer (CT) complex formed from pyrene and tetracyanobenzene can be fabricated via a solution-based method. Intersystem crossing of the directly excited CT exciton in the cocrystal is observed, yielding a CT triplet exciton that undergoes efficient triplet-triplet energy transfer to a diphenylanthracence (DPA)-based triplet acceptor. For the first time, we demonstrate that these micro-cocrystals can act as triplet sensitizers to upconvert the emission of liquid-state DPA triplet acceptors, enabling highly efficient triplet-triplet annihilation photon upconversion (TTA-UC) from 532 to 430 nm. This work demonstrates the utilization of CT excitons as triplet sensitizers in a TTA-UC process, providing a novel approach for efficient and heavy-atom-free UC systems.
DOI: 10.1021/jacs.5c17410
Authors: Jianlei Han, Zhiying Bai, Jiao Mu, Xue Jin, Xuefeng Yang, Tonghan Zhao, Yonghong Shi, Pengfei Duan, Zihao Xu
Institutions: Jiaxing University, Chinese Academy of Sciences, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, National Center for Nanoscience and Technology, Northwest Institute For Non-Ferrous Metal Research, University of Chinese Academy of Sciences
Language: English
Field: Chemistry
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G1865658891, G3441782353, G3896809160, G3958743606, G469238344, G555473677, G5664051234, G5857582427, G5923869547, G6007472573, G645061664, G7089360643, G7246119094
OpenAlex ID: W4416510328
FWCI: 4.061
Cites: 30
Cited by: 9
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