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Preparation of matrix-free long-afterglow carbon dots, adjustment and control method of afterglow types and application thereof

A long-lasting, matrix-free technology, applied in the field of materials, can solve the problems of difficult realization of CDs, limit the application of long-lasting CDs, complex environmental toxicity in the preparation process, etc., and achieve delayed fluorescence and room temperature phosphorescence, long afterglow life, and cheap and easy raw materials The effect

Pending Publication Date: 2021-09-28
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these methods is usually complicated, there is a certain degree of environmental toxicity, and it takes a lot of time to screen suitable matrices, which severely limits the application of long-lasting CDs in various fields.
In addition, the regulation of the type of afterglow of CDs is currently difficult to achieve

Method used

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  • Preparation of matrix-free long-afterglow carbon dots, adjustment and control method of afterglow types and application thereof
  • Preparation of matrix-free long-afterglow carbon dots, adjustment and control method of afterglow types and application thereof
  • Preparation of matrix-free long-afterglow carbon dots, adjustment and control method of afterglow types and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Weigh 1.0 g of benzoic acid derivative and 500 μL of ethylenediamine solution into 10 mL of ultrapure water, then transfer the above solution to a 50 mL autoclave lined with Teflon, and heat at 200 °C for 12 hours After cooling to room temperature, the CDs solution was obtained and stored in a refrigerator at 4°C.

[0035] 2) Treat the CDs solution obtained in step 1) with a 0.22 μm filter membrane to remove large particles;

[0036] 3) The CDs solution obtained in step 2) is vacuum freeze-dried to obtain solid long-lasting CDs powder, which is stored in a desiccator.

[0037] In said step 1), benzoic acid derivatives are respectively selected from phthalic acid (prepared product is denoted as Pht-CDs), isophthalic acid (prepared product is denoted as Iso-CDs), terephthalic acid (prepared product is denoted as Iso-CDs), terephthalic acid (prepared product The product is denoted as Ter-CDs), diphthalic acid (the product prepared is denoted as Hem-CDs), trimellitic ac...

Embodiment 2

[0039] 1) Weigh 1.0g of benzoic acid derivative and 500μL of ethylenediamine solution into 10mL of ultrapure water, then transfer the above solution to a 50mL autoclave lined with polytetrafluoroethylene, and heat at 200°C for 12h , cooled to room temperature to obtain a CDs solution, and stored in a refrigerator at 4°C.

[0040] 2) Treat the CDs solution obtained in step 1) with a 0.22 μm filter membrane to remove large particles;

[0041] 3) The CDs solution obtained in step 2) is vacuum freeze-dried to obtain solid long-lasting CDs powder, which is stored in a desiccator.

[0042] 4) The CDs powder prepared in step 3) is used for information anti-counterfeiting and encryption.

[0043] In the step 1), benzoic acid derivatives are respectively selected from phthalic acid, isophthalic acid, terephthalic acid, phthalic acid, trimellitic acid, and trimellitic acid to prepare CDs respectively.

[0044] figure 1 TEM images of the six kinds of CDs prepared in the examples, it c...

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Abstract

The invention discloses preparation of matrix-free long-afterglow carbon dots (CDs), an adjustment and control method of afterglow types and the application thereof. According to the invention, the matrix-free long afterglow CDs of six kinds of polymers are prepared by a one-step hydrothermal method. Due to the structure of the polymer, a rigid matrix is provided for the CDs, so that triplet excitons of the CDs are protected from being quenched by oxygen and moisture in the environment. By adjusting and controlling the rigid structure of the prepared CDs, adjustment and control between room-temperature phosphorescence and delayed fluorescence can be effectively realized. The CDs with long afterglow emission show potential in the aspects of information anti-counterfeiting, encryption and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to long afterglow carbon dots and applications thereof. Background technique [0002] Counterfeit goods such as currency, fuel, microelectronics, and clothing are proliferating in contemporary markets, causing financial loss to customers and copyright owners. At present, various anti-counterfeiting and information encryption technologies have been developed and widely used in the economic and military fields and our personal daily life. Among the existing anti-counterfeiting and information encryption technologies, fluorescent labeling technology has attracted extensive attention due to its convenient identification process. However, similar emission characteristics can be obtained by using some substitutes or simply mixing different fluorescent materials, thus showing poor anti-counterfeiting and information encryption performance. The afterglow material can effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15C01P2004/04
Inventor 孙向英何维刘斌
Owner HUAQIAO UNIVERSITY
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