Interface preassembly oriented growth strategy towards flexible crystalline covalent organic framework films for OLEDs

Xiang-Chun Li, Hao Sun, Zuqiang Wang, Weijie Yang, Qiaoyu Wang, Chuanrui Wu, Jiajun Chen, Qinchen Jiang, Ling-Jun He, Qian Xue, Wei Huang and Wen-Yong Lai ()
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Xiang-Chun Li: Nanjing University of Posts & Telecommunications
Hao Sun: Nanjing University of Posts & Telecommunications
Zuqiang Wang: Nanjing University of Posts & Telecommunications
Weijie Yang: Nanjing University of Posts & Telecommunications
Qiaoyu Wang: Nanjing University of Posts & Telecommunications
Chuanrui Wu: Nanjing University of Posts & Telecommunications
Jiajun Chen: Nanjing University of Posts & Telecommunications
Qinchen Jiang: Nanjing University of Posts & Telecommunications
Ling-Jun He: Nanjing University of Posts & Telecommunications
Qian Xue: Nanjing University of Posts & Telecommunications
Wei Huang: Nanjing University of Posts & Telecommunications
Wen-Yong Lai: Nanjing University of Posts & Telecommunications

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract The synthesis of flexible crystalline films for optoelectronic applications remains a significant chemical challenge due to the inherent contradiction between flexibility and crystallinity. The delicate balance between flexibility and crystallinity has long constituted a barrier to the development of high-performance optoelectronic materials. Herein, an interface preassembly oriented growth (IPOG) strategy has been explored to fabricate flexible crystalline covalent organic framework (COF) films with controllable thickness. By synergistically modulating hydrophilic and hydrophobic interactions along with interfacial confinement, a set of uniform and flexible crystalline COF films were successfully synthesized. This achievement unlocks the potential of COFs for device applications in organic light-emitting diodes, leading to unprecedented high-efficiency electroluminescence from COFs. This groundbreaking advancement not only lays the foundation for the progress of COF-based OLEDs but also signifies the advent of an era in the synthesis of flexible crystalline materials, wherein exceptional mechanical properties are seamlessly integrated with superior electronic performance, thus heralding a transformative impact on the landscape of flexible electronics.

Date: 2025
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DOI: 10.1038/s41467-025-58534-7

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