近日，香港中文大学（深圳）唐本忠团队研究了二维共价有机框架中光致发光的动态操纵。这一研究成果发表在2026年3月16日出版的《自然—光子学》杂志上。
二维共价有机框架因其独特的聚集结构而备受科学界关注——这种结构由扩展的分子片层堆叠构成周期性柱状π阵列与开放多孔通道。二维共价有机框架中可配置的官能团与可控的分子堆叠，为开发先进发光系统提供了可编程平台。然而，精确调控其光物理性质并深入理解激发态动力学仍面临根本性挑战。
研究组报道了两种显示热激活延迟荧光的亚胺连接型二维共价有机框架粉末，其长程有序性与致密堆叠特性最小化了单重态-三重态能隙，促进了反系间窜越。通过调控层间堆叠模式与外部环境，在二维共价有机框架中实现了从延迟荧光到磷光的动态光物理调控。具体而言，溶剂分子的层间插入与低温刚性化增强了二维共价有机框架在77开尔文下的磷光发射。
研究组观察到，通过原位聚合将二维共价有机框架分散体嵌入三维交联环氧树脂基质后，材料展现出光激活的室温磷光行为，寿命长达1.26秒，且具有超过20个月的卓越长期稳定性。这些共价有机框架@环氧树脂复合材料在三维制造、抗菌处理和可擦除光打印领域的应用潜力已通过实验验证。
附：英文原文
Title: Dynamic manipulation of photoluminescence in two-dimensional covalent organic frameworks
Author: Guo, Jingjing, Bi, Shuai, He, Ting, Cheng, Yu, Wang, Shihuai, Wang, Zhifang, Dong, Xiaobin, Zhao, Yue, Zhao, Zujin, Tang, Ben Zhong, Zhao, Yanli
Issue&Volume: 2026-03-16
Abstract: Two-dimensional covalent organic frameworks (2D COFs) have garnered considerable scientific interest on account of their special aggregated structures consisting of extended molecular sheets stacked in layers to form periodic columnar π arrays and open porous channels. The configurable functional groups and controllable molecular stacks in 2D COFs offer a programmable platform for developing advanced luminescent systems. However, precise manipulation of their photophysical properties and thorough understanding of their excited state dynamics remain fundamentally challenging. Here we report two imine-linked 2D COF powders that exhibit thermally activated delayed fluorescence, in which long-range order and dense stacking minimize the singlet–triplet splitting energy and promote reverse intersystem crossing. By engineering interlayer stacking modes and external environments, dynamic manipulation of photoluminescence from delayed fluorescence to phosphorescence is established in 2D COFs. Specifically, the interlayer insertion of solvent molecules and cryogenic rigidification enhance phosphorescence emissions of 2D COFs at 77K. We observe photoactivated room temperature phosphorescence behaviour with lifetimes of up to 1.26s and exceptional long-term stability exceeding 20months from embedded COF dispersions in three-dimensional crosslinked epoxy matrix by in situ polymerization. The potential applications of these COF@epoxy composites in three-dimensional manufacturing, antibacterial treatment and erasable light printing are demonstrated.
DOI: 10.1038/s41566-026-01875-6
Source: https://www.nature.com/articles/s41566-026-01875-6