Tuneable Near White-emissive Two-dimensional Covalent Organic Frameworks

Overview

Journal Nat Commun

Specialty Biology

Date 2018 Jun 15

PMID 29899332

Citations 29

Authors

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

Kian Ping Loh

Affiliations

Soon will be listed here.

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.

Citing Articles

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