Multimode anti-counterfeiting method based on luminescence doped quantum dots

A technology doped with quantum dots and silver, which is applied in instruments, inks, household appliances, etc., can solve the problems of not being able to achieve good anti-counterfeiting effects, and the anti-counterfeiting technology is easy to be imitated, so as to improve the difficulty of imitation, easy identification, and improve confidentiality Effect

Active Publication Date: 2019-01-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-mode anti-counterfeiting method based on luminescent doped quantum dots in order to solve the problem that the existing luminescent quantum dot anti-counterfeiting technology is easy to be imitated and cannot achieve good anti-counterfeiting effect

Method used

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  • Multimode anti-counterfeiting method based on luminescence doped quantum dots
  • Multimode anti-counterfeiting method based on luminescence doped quantum dots
  • Multimode anti-counterfeiting method based on luminescence doped quantum dots

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Embodiment 1

[0032] A multimode anti-counterfeiting method based on luminescent doped quantum dots, said method comprising the following steps:

[0033] Step 1: Prepare 40 mg of silver-doped cadmium sulfide quantum dots and disperse them into 0.5 ml of water by ligand exchange. Add 0.1 ml of ethylene glycol as a viscosity modifier to obtain a printable luminescent ink that emits red fluorescence under ultraviolet light, as figure 1 shown. Inject the luminescent ink into the clean ink cartridge, connect it to the computer, design the mark pattern to be printed on the computer, and then print it on white paper, coins, PET film, such as figure 2 shown. Under ultraviolet light, the anti-counterfeiting mark emits red fluorescence, such as image 3 shown.

[0034] Step two, will be as Figure 4 The anti-counterfeiting mark shown is immersed in the methanol solution of saturated silver nitrate, and after cation exchange, the fluorescence of the anti-counterfeiting mark disappears under ultr...

Embodiment 2

[0037] A multimode anti-counterfeiting method based on luminescent doped quantum dots, said method comprising the following steps:

[0038] In step 1, 40 mg of copper-doped cadmium sulfide quantum dots were prepared and dispersed into 0.5 ml of water by ligand exchange. Add 0.1 ml of ethylene glycol as a viscosity modifier to obtain a printable luminous ink. Inject the luminescent ink into the clean ink cartridge, connect it to the computer, design the mark pattern to be printed on the computer, and then print it on white paper, coins, or PET film. Under ultraviolet light, the anti-counterfeiting mark emits orange-red fluorescence.

[0039] Step 2, immerse the above-mentioned anti-counterfeit mark in methanol solution of saturated copper nitrate trihydrate, and perform cation exchange, and the fluorescence of the anti-counterfeit mark disappears under ultraviolet light.

[0040] Step 3, immerse the above-mentioned anti-counterfeiting mark after the fluorescence disappears in...

Embodiment 3

[0042] A multimode anti-counterfeiting method based on luminescent doped quantum dots, said method comprising the following steps:

[0043] Step 1: Prepare 40 mg of silver-doped cadmium sulfide quantum dots and disperse them into 0.5 ml of water by ligand exchange. Add 0.1 ml of ethylene glycol as a viscosity modifier to obtain a printable luminescent ink. Inject the luminescent ink into the clean ink cartridge, connect it to the computer, design the mark pattern to be printed on the computer, and then print it on white paper, coins, or PET film. Under ultraviolet light, the security markings fluoresce red.

[0044] In the second step, the anti-counterfeit mark is immersed in a methanol solution of saturated copper nitrate trihydrate, and after cation exchange, the fluorescence of the anti-counterfeit mark disappears under ultraviolet light.

[0045] In the present invention, different luminescent doped quantum dots can be used for different needs, and can contain certain in...

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Abstract

The invention relates to a multimode anti-counterfeiting method based on luminescent doped quantum dots, belonging to the technical field of anti-counterfeiting. The method comprises the following steps of selecting luminescent doped quantum dots which can emit fluorescence by excitation, preparing printable luminescent ink and printing it as anti-counterfeit label, and emitting fluorescence by the anti-counterfeit label under excitation; immersing the anti-counterfeit label in solution A, and the fluorescence disappearing after the cation exchange reaction; immersing the anti-counterfeit label after fluorescence disappearance in solution B, and recovering the fluorescence after cation exchange reaction. When cation exchange reaction is adopt, the reaction temperature is low, the reactiontime is short, the operation is simple, and the change of the fluorescence signal is easy to identify. The identification process provides further anti-counterfeit verification means, which improves the confidentiality of anti-counterfeit and the difficulty of imitation. After the fluorescence signal disappears, the recovery of the fluorescence signal can be realized, and the anti-counterfeit identification can be further carried out. The recognition process requires the use of specific cationic solution to react, which further increases the security of anti-counterfeiting.

Description

technical field [0001] The invention relates to a multi-mode anti-counterfeiting method based on luminescence-doped quantum dots, which belongs to the field of anti-counterfeiting technology, and specifically relates to the characteristics of using luminescence-doped quantum dots to generate fluorescence after being excited and realize the disappearance and recovery of fluorescence through a reversible ion exchange process , used in anti-counterfeiting and information encryption and other fields. Background technique [0002] With the development of the global economy and society, people's demand for high-quality goods has increased significantly. In order to effectively curb the appearance of fake and shoddy products, a variety of anti-counterfeiting technologies have emerged as the times require. Traditional anti-counterfeiting technologies such as computer anti-counterfeiting, material anti-counterfeiting, packaging anti-counterfeiting, and printing anti-counterfeiting h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/02C09D11/50
CPCC09D11/50G09F3/0291
Inventor 张加涛黄文艺徐萌
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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