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Deuterated Covalent Organic Frameworks with Significantly Enhanced Luminescence
Author(s) -
Yuan Mengjia,
Ma Fuyin,
Dai Xing,
Chen Lixi,
Zhai Fuwan,
He Linwei,
Zhang Mingxing,
Chen Junchang,
Shu Jie,
Wang Xiaomei,
Wang Xia,
Zhang Yugang,
Fu Xiaobin,
Li Zhenyu,
Guo Chenglong,
Chen Long,
Chai Zhifang,
Wang Shuao
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202108650
Subject(s) - deuterium , luminescence , quenching (fluorescence) , covalent bond , chemical physics , kinetic isotope effect , quantum yield , isotope , chemistry , photochemistry , yield (engineering) , nanotechnology , materials science , optoelectronics , atomic physics , physics , fluorescence , organic chemistry , optics , quantum mechanics , metallurgy
Luminescent covalent organic frameworks (COFs) find promising applications in chemical sensing, photocatalysis, and optoelectronic devices, however, the majority of COFs are non or weakly emissive owing to the aggregation‐caused quenching (ACQ) or the molecular thermal motion‐based energy dissipation. Here, we report a previously unperceived approach to improve luminescence performance of COFs by introducing isotope effect, which is achieved through substitution of hydrogen from high‐frequency oscillators X‐H (X=O, N, C) by heavier isotope deuterium. Combining the “bottom‐up” and in situ deuteration methods generates the first deuterated COF, which exhibits an impressively 19‐fold enhancement in quantum yield over that of the non‐deuterated counterpart. These results are interpreted by theoretical calculations as the consequence of slower C/N‐D and OD⋅⋅⋅O vibrations that impede the nonradiative deactivation process. The proposed strategy is proved applicable to many other types of emissive COFs.