Anti-counterfeiting identification method by aid of quantum points

An anti-counterfeiting label and quantum dot technology, which is applied in the field of anti-counterfeiting labeling based on the difference in wavelength and emission peak intensity, can solve the problems of complex process, low precision, and narrow anti-counterfeiting range, and achieve large information capacity, good stability, and difficulty in imitation effect

Inactive Publication Date: 2012-09-26
GUANGDONG POLY OPTOELECTRONICS
View PDF9 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, patent CN102296486A applies photoluminescence materials, magnetic materials, pressure-sensitive materials and bio-anti-counterfeiting materials containing quantum dot materials only to anti-counterfeiting paper, and the anti-counterfeiting range is relatively narrow; while patent CN 102002365A combines quantum dots with inorganic Nano-oxide phosphors, organic dyes containing unsaturated bonds, organic light-emitting small molecules, and organometallic complex molecules containing rare earth elements are used in the field of invisible anti-counterfeiting, which are mainly identified by fluorescent colors and spectral scanners, but due to It contains a variety of fluorescent materials, and its fluorescence emission intensity and characteristic spectrum need to be measured through optical filters or gratings. The process is relatively complicated, the accuracy is not high, and the amount of anti-counterfeiting information is not rich enough

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anti-counterfeiting identification method by aid of quantum points
  • Anti-counterfeiting identification method by aid of quantum points
  • Anti-counterfeiting identification method by aid of quantum points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of cadmium selenide (CdSe) quantum dots

[0039] Step 1: Add 0.1mmol of cadmium oxide (CdO) and 0.4mmol of stearic acid (SA) into a three-necked flask, use Schlenk technology, degas and inflate several times, heat to 150°C, and keep for 25min to fully dissolve CdO to Colorless, then cooled to 50 ° C.

[0040] Step 2: Add 1.94 g of tri-n-octylphosphine oxide (TOPO) with a purity greater than 90% and 1.94 g of hexadecylamine (HDA) with a purity greater than 90% into a three-necked flask. Using Schlenk technology, after the water and oxygen are exhausted through the vacuum system, it is heated to 320°C under an argon atmosphere. At this time, use a syringe to quickly inject the stock solution prepared with 1mmol selenium (Se) and 2ml tri-n-butylphosphine (TBP), and quickly cool down to 260°C, keep the reaction for 30min, and finally withdraw the heating device to cool the product to room temperature .

[0041] Step 3: Add chemically pure chlorofor...

Embodiment 2

[0045] Two kinds of CdSe quantum dots with different particle sizes A and B are separately excited, and the obtained fluorescence spectrum is as follows figure 2 and image 3 As shown, the central wavelength of quantum dot A is 567nm, and the central wavelength of quantum dot B is 621nm. Two kinds of CdSe quantum dots A and B are mixed in molar percentages of 2:1 and 4:1 respectively, and the fluorescence spectrum of the mixed quantum dot mixture is as follows Figure 4 shown. Depend on Figure 4 It can be seen that after quantum dot A and quantum dot B are mixed in different proportions, the wavelengths of the emission peaks of the two are unchanged, the fluorescence characteristic peaks of each quantum dot can be clearly distinguished, and the emission peak intensity ratio of quantum dots and its mixing ratio exist. Correspondence, and has relative specificity. This shows that after mixing quantum dot materials with different emission wavelengths together, the emission ...

Embodiment 3

[0047] Dissolve CdSe quantum dots of different sizes in chloroform, the particle size of the quantum dots is preferably 2~8nm, make a CdSe chloroform mixture with a mass concentration of 10%, and then impregnate the membrane material (the membrane material has multiple cavities) into In the above mixed solution, the above-mentioned CdSe quantum dots of different sizes are adsorbed in the cavity of the film material, such as Figure 5 As shown, then use this film to make an anti-counterfeit mark, and then load the target product through pasting, packaging, etc. Optical information such as the central wavelength of each quantum dot in the cavity of the membrane material and the luminous intensity of each quantum dot is read by a spectral detection instrument such as a fiber optic spectrometer, and the obtained emission wavelength of each quantum dot and the luminescence of each emission wavelength are read. Intensity ratios are transformed by coding rules. For example: the emis...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
wavelengthaaaaaaaaaa
wavelengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to an anti-counterfeiting identification method by the aid of quantum points. The anti-counterfeiting identification method includes preparing quantum point ink: dispersing the quantum points in different structures and / or with different sizes into an organic solvent, adding transparent ink into the organic solvent, and uniformly mixing the organic solvent containing the quantum points with the transparent ink to prepare the quantum point ink capable of transmitting light with different wavelengths; loading an anti-counterfeiting identification: loading the prepared quantum point ink into a target product to be marked, forming the anti-counterfeiting identification in such a manner that at least partial areas in various component of the anti-counterfeiting identification contain more than one type of quantum points; detecting and converting the anti-counterfeiting identification: reading the central wavelength of each quantum point in the various components and ratios of luminescence intensities of the various quantum points by a spectrum detecting instrument; and converting the central wavelengths and the luminescence intensities of the various quantum points according to a coding rule to obtain a group of specific identification information, and judging the identification by the information. The anti-counterfeiting identification method has the advantages of difficulty in copying, high information capacity and fine stability.

Description

technical field [0001] The invention belongs to the field of anti-counterfeiting marks, specifically relates to a method for anti-counterfeiting marks by using quantum dots, and more specifically relates to a method for carrying out anti-counterfeiting marks according to the difference in emission wavelength and emission peak intensity of each quantum dot. Background technique [0002] Today, with the surge in information volume, the security and accurate identification of information has become a topic of widespread concern in society. Especially with the increasing prosperity of the commodity economy and the continuous development of science and technology, anti-counterfeiting has become a brand-new and constantly developing field. At present, the existing security identification technology generally has various technical defects such as complex production process, high price, poor precision, easy cracking, instability, and susceptibility to interference from external fact...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/02G01N21/64G06K7/10
Inventor 刘江国廖杰进
Owner GUANGDONG POLY OPTOELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap