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Anti-counterfeiting and information security method based on near-infrared luminescent quantum dots

A technology of luminescent quantum and information security, applied in chemical instruments and methods, luminescent materials, printing of special varieties of printed matter, etc., can solve the problem of inability to obtain anti-counterfeiting effects, and achieve the goal of increasing the difficulty of copying, difficult to crack, and easy to popularize and apply. Effect

Active Publication Date: 2022-07-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The single visible fluorescence emitted by ordinary quantum dot materials after being excited will be imitated by some alternative materials, and excellent anti-counterfeiting effects cannot be obtained

Method used

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  • Anti-counterfeiting and information security method based on near-infrared luminescent quantum dots
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  • Anti-counterfeiting and information security method based on near-infrared luminescent quantum dots

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preparation example Construction

[0044] The doped quantum dots are preferably shell passivation metal-doped core-shell quantum dots prepared by a cyclic thermal injection method. The preparation method of the shell passivation metal-doped core-shell quantum dots comprises the following steps:

[0045] S11. Disperse the metal-doped quantum dots into a solvent, add a predetermined content of the ligand solution containing the metal ions doped in the metal-doped quantum dots into the solvent, and then evacuate until the low-boiling solvent is completely extracted;

[0046] S12. The reaction system treated in step S11 is heated to 160-200°C, and a solution containing the metal element of the passivation layer is injected into it. After the reaction is performed for 5-15 minutes, the sulfur powder solution is injected again and the temperature is continued to be raised to 220-260°C. This temperature reaction 15-30 is recorded as the first cycle heat injection;

[0047] S13. Cool the reaction system processed in s...

Embodiment 1

[0054] An anti-counterfeiting and information security method based on near-infrared light-emitting quantum dots, comprising the following steps:

[0055] S1. adding the prepared Cu-doped CdSe / CdS quantum dots to an appropriate amount of toluene, mixing evenly to obtain a printable anti-counterfeiting ink, and printing it according to a preset pattern to obtain an anti-counterfeiting mark;

[0056] S2. Under the excitation of ultraviolet light, the fluorescence emitted by the anti-counterfeiting label obtained in step S1 is transmitted through a filter with the ability to filter out visible light, and then an infrared observation device (such as a simple device such as a smartphone camera) is used to obtain pattern information, Authentication is based on whether a fluorescent pattern can be observed or not, or confidential information is determined based on the observed fluorescent pattern.

Embodiment 2

[0058] An anti-counterfeiting and information security method based on near-infrared light-emitting quantum dots, comprising the following steps:

[0059] (1) Printing of interference information: Put the intrinsic CdSe / CdS quantum dot toluene ink into the ink cartridge, then put the ink cartridge into the printer, and print on parchment paper without fluorescent whitening agent according to the pre-designed second preset pattern information , get the interference pattern.

[0060] Preparation of Intrinsic CdSe / CdS Quantum Dot Ink:

[0061] (11) Put 0.6 mmol of cadmium oxide, 3 mmol of stearic acid and 12 ml of octadecene into a 50 ml three-necked flask, feed nitrogen and heat up to 250°C. Then inject 1.5ml suspension of 0.1M selenium powder octadecene, add 0.3ml 0.1M selenium powder octadecene suspension after 10 minutes, add 0.15ml 0.1M 3-4 minutes later Then add 0.15 ml of 0.1M selenium powder octadecene suspension at intervals of 3-4 minutes until the position of the fir...

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Abstract

The invention provides an anti-counterfeiting and information security method based on near-infrared light-emitting quantum dots. The anti-counterfeiting mark is obtained by printing the doped quantum dot ink with dual-mode fluorescence emission characteristics of visible light and near-infrared light; Infrared observation equipment is used to obtain pattern information, and the authenticity is identified according to whether the fluorescence pattern can be observed, or the confidential information is determined according to the observed fluorescence pattern. The invention also increases the difficulty of copying or deciphering anti-counterfeiting and confidentiality by printing the interference pattern on the basis of the anti-counterfeiting mark. The doped quantum dots selected in the present invention are obtained by coating the passivation shell layer by the cyclic thermal injection method, and the fluorescence performance is more stable. Therefore, the present invention is simple to operate, can achieve strong anti-counterfeiting and security functions, can identify and obtain confidential information only through the camera of the mobile phone, is simple and fast, and is convenient for popularization and application.

Description

technical field [0001] The invention relates to the technical field of quantum dot anti-counterfeiting, in particular to an anti-counterfeiting and information security method based on near-infrared light-emitting quantum dots. Background technique [0002] With the continuous development of the social economy, a variety of commodities continue to improve people's living standards. At the same time, counterfeit and shoddy products are also flooding the commodity market. Fake and shoddy goods and market fraud have become an important factor restricting the sustainable, rapid and healthy development of China's national economy. At the same time, in the information society, the confidentiality of text and picture information is becoming more and more important. The leakage of these information often gives criminals an opportunity to cause economic and personal harm. In recent years, with the continuous development of science and technology, quantum dot materials have been gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09F3/00B41M3/14C09K11/88C09K11/02C09K11/70
CPCG09F3/0294B41M3/14C09K11/883C09K11/02C09K11/70
Inventor 张加涛张书萍徐萌李建中白冰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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