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Solid-State Photoluminescent Imine-Linked Two-Dimensional Covalent Organic Frameworks.

Changsheng Du1,2, Wenjing Na2,3, Haojie Huang1,2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 24, 2025
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Summary

Researchers developed highly luminescent covalent organic frameworks (COFs) for advanced applications. These novel 2D COFs exhibit exceptional solid-state photoluminescence quantum yields (PLQY), overcoming previous limitations.

Keywords:
2D covalent organic frameworksbioimagingdonor–acceptor–donor structureiminesolid‐state photoluminescence

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Efficient solid-state luminescent covalent organic frameworks (COFs) are vital for sensing, imaging, and optoelectronics.
  • Imine-linked COFs often suffer from low photoluminescent quantum yields (PLQY) due to nonradiative quenching pathways.

Purpose of the Study:

  • To design and synthesize novel solid-state photoluminescent imine-linked 2D COFs with enhanced PLQY.
  • To investigate the structural and electronic properties contributing to high luminescence in these COFs.

Main Methods:

  • Condensation of rigid building blocks to form 2D COFs.
  • Characterization of crystallinity, porosity, and solid-state photoluminescence.
  • Analysis of donor-acceptor-donor structures to understand excitation and charge transfer mechanisms.

Main Results:

  • Successful synthesis of highly crystalline and porous imine-linked 2D COFs.
  • Achieved remarkable solid-state PLQY up to 39%.
  • Identified a donor-acceptor-donor structure that bypasses imine bonds, suppressing nonradiative decay.

Conclusions:

  • The novel 2D COFs exhibit superior solid-state luminescence due to optimized electronic structures.
  • These materials hold significant potential for applications in bioimaging and optoelectronics.
  • The findings provide a pathway for designing high-performance luminescent COFs.