Tuneable near white-emissive two-dimensional covalent organic frameworks

Xing Li, Qiang Gao, Juefan Wang, Yifeng Chen, Zhi-Hui Chen, Hai-Sen Xu, Wei Tang, Kai Leng, Guo-Hong Ning, Jishan Wu, Qing-Hua Xu, Su Ying Quek, Yixin Lu and Kian Ping Loh ()
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Xing Li: National University of Singapore, 3 Science Drive 3
Qiang Gao: National University of Singapore, 3 Science Drive 3
Juefan Wang: National University of Singapore, 6 Science Drive 2
Yifeng Chen: National University of Singapore, 6 Science Drive 2
Zhi-Hui Chen: National University of Singapore, 3 Science Drive 3
Hai-Sen Xu: National University of Singapore, 3 Science Drive 3
Wei Tang: A*STAR, 2 Fusionopolis Way, Innovis
Kai Leng: National University of Singapore, 3 Science Drive 3
Guo-Hong Ning: National University of Singapore, 3 Science Drive 3
Jishan Wu: National University of Singapore, 3 Science Drive 3
Qing-Hua Xu: National University of Singapore, 3 Science Drive 3
Su Ying Quek: National University of Singapore, 6 Science Drive 2
Yixin Lu: National University of Singapore, 3 Science Drive 3
Kian Ping Loh: National University of Singapore, 3 Science Drive 3

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Most two-dimensional (2D) covalent organic frameworks (COFs) are non-fluorescent in the solid state even when they are constructed from emissive building blocks. The fluorescence quenching is usually attributed to non-irradiative rotation-related or π–π stacking-caused thermal energy dissipation process. Currently there is a lack of guiding principle on how to design fluorescent, solid-state material made of COF. Herein, we demonstrate that the eclipsed stacking structure of 2D COFs can be used to turn on, and tune, the solid-state photoluminescence from non-emissive building blocks by the restriction of intramolecular bond rotation via intralayer and interlayer hydrogen bonds among highly organized layers in the eclipse-stacked COFs. Our COFs serve as a platform whereby the size of the conjugated linkers and side-chain functionalities can be varied, rendering the emission colour-tuneable from blue to yellow and even white. This work provides a guide to design new solid-state emitters using COFs.

Date: 2018
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DOI: 10.1038/s41467-018-04769-6

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