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Visible light excited dual-mode long-afterglow carbon dot compound as well as preparation method and application thereof

A compound and dual-mode technology, applied in the field of materials, can solve the problems of limited applications, achieve the effects of promoting intersystem crossing, realizing long afterglow emission excited by visible light, and high optical stability

Pending Publication Date: 2020-12-29
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the constructed CDs composite systems cannot simultaneously generate room temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) emission.
Moreover, most of the reported afterglow materials based on CDs can only be excited under UV light, which severely limits their further applications.

Method used

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  • Visible light excited dual-mode long-afterglow carbon dot compound as well as preparation method and application thereof
  • Visible light excited dual-mode long-afterglow carbon dot compound as well as preparation method and application thereof
  • Visible light excited dual-mode long-afterglow carbon dot compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Weigh 100mg of safranine T and dissolve it in 20mL of 0.5M sodium hydroxide solution, and sonicate for 10min to completely dissolve the safflower T; After heating at 200° C. for 5 hours, the CDs solution was obtained and stored in a 4° C. refrigerator.

[0040] 2) Take different volumes (100 μL, 500 μL, 1000 μL, 2000 μL, 3000 μL, 3500 μL) of the CDs solution and 2 g of boric acid prepared in step 1), add them into 40 mL of secondary water, and sonicate for 10 min to make them fully mixed. The mouth of the beaker was sealed with tin foil to prevent the water from evaporating too quickly.

[0041] 3) The mixed solution of CDs and boric acid in step 2) was placed in an oven at 180° C. for 5 hours and then cooled to room temperature.

[0042] 4) Grinding the sample prepared in step 3) into powder to finally obtain CDs / B 2 o 3 Compound powder, stored in a desiccator.

Embodiment 2

[0044] 1) Weigh 100mg of safranine T and dissolve it in 20mL of 0.5M sodium hydroxide solution, and sonicate for 10min to completely dissolve the safflower T; After heating at 200°C for 5 hours, the CDs solution was obtained and stored in a refrigerator at 4°C.

[0045]2) Take 2000 μL of the CDs solution prepared in step 1) and boric acid of different masses (0.5 g, 1 g, 2 g, 3 g, 4 g), add it into 40 mL of secondary water, and sonicate it for 10 min to make it fully mixed. The mouth of the beaker was sealed with tin foil to prevent the water from evaporating too quickly.

[0046] 3) The mixed solution of CDs and boric acid in step 2) was placed in an oven at 180° C. for 5 hours and then cooled to room temperature.

[0047] 4) Grinding the sample prepared in step 3) into powder to finally obtain CDs / B 2 o 3 Compound powder, stored in a desiccator.

Embodiment 3

[0049] 1) Weigh 100mg of safranine T and dissolve it in 20mL of 0.5M sodium hydroxide solution, and sonicate for 10min to completely dissolve the safflower T; After heating at 200° C. for 5 hours, the CDs solution was obtained and stored in a 4° C. refrigerator.

[0050] 2) Take 2000 μL of the CDs solution prepared in step 1) and 2 g of boric acid, add it into 40 mL of secondary water, and sonicate it for 10 min to make it fully mixed. The mouth of the beaker was sealed with tin foil to prevent the water from evaporating too quickly.

[0051] 3) Put the mixed solution of CDs and boric acid in step 2) in an oven at different temperatures (140°C, 160°C, 180°C, 200°C, 220°C) for 6 hours, then cool to room temperature.

[0052] 4) Grinding the sample prepared in step 3) into powder to finally obtain CDs / B 2 o 3 Compound powder, stored in a desiccator.

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Abstract

The invention discloses a visible light excited dual-mode long-afterglow carbon dot compound as well as a preparation method and application thereof. The prepared carbon dots are doped into boron oxide grids in the high-temperature heating process, carbon-boron bonds are formed, inter-system jump is promoted, and the obtained CDs / B2O3 compound can obtain long-afterglow delayed fluorescence and room-temperature phosphorescence emission at the same time under visible light excitation, and the CDs / B2O3 compound with visible light excited delayed fluorescence and room-temperature phosphorescence has potential in the aspect of potential fingerprint identification.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to carbon dot composites. Background technique [0002] Due to its unique and lifetime characteristics, fingerprints have been used by investigative agencies in various countries as the most direct, reliable and fastest way to discover and identify criminals. Therefore, various luminescent materials have been developed for visual identification of latent fingerprints. Compared with conventional semiconductor quantum dots and organic dyes, carbon dots (CDs) have been widely used in fluorescence sensing, light-emitting devices, photocatalysis, biological in the field of imaging. At present, the research on the fluorescence properties of carbon dots has been in-depth, but there are few reports on the long-lasting properties of carbon dots. Incorporation of CDs into zeolites, organic polymers, layered double hydroxides, urea / biuret, and silica can produce afterglow emission. Howev...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02A61B5/1172
CPCC09K11/65C09K11/025A61B5/1172
Inventor 孙向英何维
Owner HUAQIAO UNIVERSITY
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