Affiliation:
1. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
2. University of the Chinese Academy of Sciences Beijing 100049 China
3. Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108 China
Abstract
AbstractCovalent organic frameworks (COFs), with their accessible nanoscale porosity, selectable building blocks, and precisely engineered topology, offer unique benefits in the design of room‐temperature phosphorescent (RTP) materials. However, their potential has been limited by phosphorescence quenching caused by interlayer π–π stacking interactions. This paper presents a novel strategy to enhance RTP in heavy‐atom‐free COFs by employing a donor–acceptor (D–A) system that leverages the Förster resonance energy transfer (FRET) and Dexter energy transfer (DET) mechanisms. Among the materials investigated, the best‐performing COF exhibits a phosphorescence lifetime of 4.35 ms at room temperature. Spectral analysis, structural analysis, and theoretical calculations indicate the presence of intralayer FRET processes as well as interlayer DET processes within the D–A COF system. Potential anti‐counterfeiting applications are explored by exploiting the unique phosphorescent properties of these materials. Additionally, the inherent permanent porosity of COFs presents new opportunities for future development and application. This strategy offers many promising prospects for advancing the RTP technology in COF materials and broadens their potential applications in various fields.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province