Water-soluble carbon dot-based afterglow luminescent material based on multi-carboxyl carbon source and preparation method of water-soluble carbon dot-based afterglow luminescent material

By combining a multi-carboxylated carbon source with NaYF4 nanocrystals, a structurally stable, nanoscale, water-soluble carbon dot-based afterglow luminescent material was prepared. This solved the problem of limited afterglow lifetime and wavelength controllability in existing technologies, and improved the stability and performance of the material, making it suitable for a wider range of applications.

CN120966470APending Publication Date: 2025-11-18SOUTH CHINA AGRICULTURAL UNIVERSITY
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Patent Information

Application Number
CN202510877013.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-27
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing carbon dot-based afterglow luminescent materials have limited afterglow lifetime and wavelength tunability, and their performance is unstable in complex solution environments, which limits their application range.

Method used

Using a multi-carboxyl carbon source as the carbon source, a stable, nanoscale, water-soluble carbon dot-based afterglow luminescent material was prepared by combining it with NaYF4 nanocrystals via a high-temperature co-precipitation method. The carboxyl groups of organic acids were complexed with yttrium ions and carbonized, then embedded into the nanocrystals to form CDs@NaYF4-OA nanoparticles. The water-soluble CDs@NaYF4 composite material was obtained by acid washing and centrifugation.

Benefits of technology

The structure stability and dispersibility of water-soluble carbon dot-based afterglow luminescent materials have been achieved, extending the afterglow lifetime and expanding the controllable range of afterglow emission wavelength, thus adapting to more complex application scenarios.

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Abstract

The invention relates to the field of luminescent carbon nanomaterials, in particular to a water-soluble carbon dot-based afterglow luminescent material based on a multi-carboxyl carbon source and a preparation method of the water-soluble carbon dot-based afterglow luminescent material. The preparation method comprises the following steps: step 1, uniformly mixing a Y (CH3CO2) 3 solution, oleic acid and 1-octadecene according to a formula ratio; 2, heating to 120-160 DEG C, reacting for 20-50 minutes, then cooling to 40-60 DEG C, preserving heat, and adding a NaOH methanol solution and an NH4F methanol solution; step 3, adding organic acid, wherein the organic acid contains at least two carboxyl groups; and 4, heating to 90-120 DEG C, vacuumizing, then heating to 280-320 DEG C, reacting for 1-3 hours in a nitrogen atmosphere, naturally cooling to room temperature, and carrying out post-treatment to obtain the water-soluble CDs (at) NaYF4 composite material. According to the preparation method, the water-soluble carbon dot-based afterglow luminescent material based on the multi-carboxyl carbon source, which is stable in structure and good in dispersity, can be prepared, and the water-soluble carbon dot-based afterglow luminescent material has the advantages of long service life and wide application range.
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