Solid-state luminous magnetic carbon dot fluorescent material as well as preparation method and application thereof

By preparing magnetic carbon dot fluorescent materials with magnetic Fe3O4 linked to carbon dots, the problem of luminescence quenching of carbon dots in solids was solved, achieving efficient fingerprint extraction on dark matter.

CN120966469APending Publication Date: 2025-11-18WENZHOU MEDICAL UNIV
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Patent Information

Application Number
CN202510854063.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-24
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing carbon dots exhibit low fluorescence quantum efficiency due to aggregation-induced emission quenching (AIQ) in solid or high-concentration conditions, and commercially available magnetic powders lack fluorescence properties, making them difficult to effectively extract fingerprints from dark-colored bodies.

Method used

Magnetic carbon dot fluorescent materials with magnetic Fe3O4 linked to carbon dots were prepared by microwave hydrothermal method using ferric ammonium citrate (AFC) as the iron source, basic fuchsin (BasF) as the carbon source, and polyethyleneimine (PEI) as the crosslinking agent. This ensured that the carbon dots and magnetic Fe3O4 were dispersed and did not come into contact, thus forming a solid-state luminescent material.

Benefits of technology

Solid-state luminescence of magnetic carbon dot fluorescent materials was achieved, improving the resolution of fingerprint extraction on dark matter while maintaining the magnetic and fluorescent properties of the materials.

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Abstract

The invention provides a solid-state luminous magnetic carbon dot fluorescent material as well as a preparation method and application thereof. Ammonium ferric citrate is taken as an iron source, basic fuchsin is taken as a carbon source, polyethyleneimine is taken as a cross-linking agent, and magnetic Fe3O4 is formed through reaction of polyethyleneimine and ammonium ferric citrate; magnetic Fe3O4 and carbon dots formed by a carbon source are connected through dehydration condensation of amino of polyethyleneimine and carboxyl on the surface of basic fuchsin, the solid-state light-emitting magnetic carbon dot fluorescent material in which the carbon dots and the magnetic Fe3O4 are dispersed and are not in contact is obtained, AIQ does not occur in the aggregate, solid-state light emitting of the magnetic carbon dot fluorescent material can be achieved, and the magnetic carbon dot fluorescent material has good application prospects. The magnetic carbon dot fluorescent material can be applied to fingerprint extraction.
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