Abstract
The design and synthesis of three-dimensional covalent organic frameworks (3D COFs) have still been considered as a big challenge. Here we report the design and synthesis of an AIEgen-based 3D COF (3D-TPE-COF), with a high surface area (1084 m2 g−1). According to powder X-ray diffraction and continuous rotation electron diffraction analyses, 3D-TPE-COF is identified to adopt a seven-fold interpenetrated pts topology. Interestingly, 3D-TPE-COF emits yellow fluorescence upon excitation, with a photoluminescence quantum yield of 20%. Moreover, by simply coating 3D-TPE-COF onto a commercial blue light-emitting diode (LED), a prototype white LED (WLED) under continuously driving without degradation for 1200 h was demonstrated. The present work suggests the possibility of using COF materials for stable WLEDs, which will greatly inspire us to design and synthesize fluorescent 3D COFs and facilitate the development of COF-based WLEDs in future.
Highlights
The design and synthesis of three-dimensional covalent organic frameworks (3D Covalent organic frameworks (COFs)) have still been considered as a big challenge
Our result clearly shows that the 3D-TPE-COF is a microporous material with high surface area, and by using the newly developed continuous rotation electron diffraction method, 3D-TPE-COF is identified to adopt a sevenfold interpenetrated pts topology with P2/c space group
The 13C cross-polarization with total suppression of sidebands (CPTOSS) NMR spectrum of 3D-TPE-COF confirmed the formation of the expected C=N bond at 158.3 ppm (Supplementary Figure 3)
Summary
The design and synthesis of three-dimensional covalent organic frameworks (3D COFs) have still been considered as a big challenge. 1234567890():,; Covalent organic frameworks (COFs) represent an emerging class of crystalline porous polymers with periodic two- or three-dimensional (2D or 3D) structure[1,2,3,4] Due to their permanent porosity, high stability, and designable functionality, COFs have gained considerable attention as promising applications in gas storage and separation[5,6], catalysis[7,8,9,10], sensing[11,12,13], optoelectronics[14,15,16,17], energy storage[18,19,20,21], etc. This WLED exhibited no degradation after aging for 1200 h at ambient condition
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