A general design approach toward covalent organic frameworks for highly efficient electrochemiluminescence

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Electrochemiluminescence (ECL) is a sensitive analytical technique with low background noise.
• Current applications of ECL are limited by the availability of tunable ECL luminophores.
• Developing new luminophores is crucial for advancing ECL-based sensing technologies.

Purpose of the Study:

• To develop a scalable method for designing tunable ECL emitters based on covalent organic frameworks (COFs).
• To achieve efficient intramolecular charge transfer and strong ECL signals in aqueous media.
• To create COF-based luminophores that do not require toxic co-reactants.

Main Methods:

• Synthesized olefin-linked donor-acceptor conjugated COFs using non-ECL active monomers with C2v or C3v symmetry.
• Restricted electron configurations within COFs to enhance donor-acceptor interactions.
• Constructed high-speed charge transport networks via olefin linkages.

Main Results:

• The synthesized COFs exhibited strong electrochemiluminescence (ECL) signals.
• ECL intensity was boosted by increasing the chain length and conjugation of the monomers.
• The COF-based emitters demonstrated efficient intramolecular charge transfer in aqueous solutions.

Conclusions:

• Precisely designed COF-based ECL luminophores offer high efficiency and tunability.
• The developed method provides a promising route for creating advanced COF-based ECL phosphors.
• This work advances the field of ECL sensing by introducing novel, high-performance luminophores.