CN112428646A - Double-layer identifiable quantum dot anti-counterfeiting label based on optical convex surface and preparation method - Google Patents
Double-layer identifiable quantum dot anti-counterfeiting label based on optical convex surface and preparation method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/14—Printing or colouring
- B32B38/145—Printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
Abstract
The invention relates to an optical convex surface-based quantum dot anti-counterfeiting label capable of realizing double-layer identification and a preparation method thereof. Comprises a substrate layer, an optical convex surface layer and a quantum dot light-emitting layer which are arranged on the substrate layer, and a cover plate layer on the top. The quantum dot light-emitting layer is prepared on the optical protrusions which are randomly distributed and controllable in density by adopting a printing or printing process, and after the quantum dot light-emitting layer is packaged through the cover plate layer, different patterns which cannot be copied can be collected at different heights in the same plane area by utilizing the light uniformizing capacity of optical particles and the space drop caused by the optical protrusion surface. The double-layer identifiable quantum dot anti-counterfeiting label provided by the invention has the advantages of simple process, low cost, stable chemical property, adaptability to flexible stretchable application, realization of double-layer progressive anti-counterfeiting of various colors by combining rich colors of quantum dots, and realization of image identification by establishing two sets of intelligent label learning libraries. The double-layer identification design of the quantum dot anti-counterfeiting label has both easy detection and anti-counterfeiting capability, and the first layer of identification only needs the portable lens matched with the excitation light source to be connected with the electronic equipment, so that the daily detection is easy; the accuracy of the second layer identification pattern can reach the nanometer level, and the anti-counterfeiting capability can be ensured to be strong enough.
Description
Technical Field
The invention belongs to the field of anti-counterfeiting, and particularly relates to an optical convex surface-based quantum dot anti-counterfeiting label capable of realizing double-layer identification and a preparation method thereof.
Background
A Physically Unclonable Function (PUF) is often accompanied by a random process, which means that it may not be duplicated per se, if it is sufficiently complex. This process is like sanding on the same surface to create a pattern. The more sand, the closer the probability of obtaining the same pattern to zero. To date, many anti-counterfeit labels based on PUF schemes have been reported, such as random cockle patterns with tunable fluorescence, randomly distributed nanoparticle patterns, and the like.
Currently, the predominant printing techniques that rely on printed security labels are prone to being copied by counterfeiters due to their uniform pattern and predictable decoding mechanisms. However, the combination of inkjet printing technology with quantum dot luminescent inks has great potential in a wide range of security applications. Ink jet printing technology itself has significant advantages in terms of reduced production costs, mass production, efficient use of materials, nearly unlimited graphic design capabilities, and good compatibility with a variety of ink materials and support materials.
Photoluminescence (PL) is not in contact with and does not damage the material. Light impinges directly on the material, is absorbed by the material and transfers excess energy to the material, a process called photoexcitation. This excess energy can be dissipated in the form of luminescence. The process of luminescence due to light excitation is called photoluminescence. Quantum Dots (QDs) are zero-dimensional semiconductor crystal nanoparticles having a nano effect, and are semiconductor nanocrystals composed of several hundreds to several thousands of atoms, and have a particle size of about 10 nm. The quantum dots have internal quantum efficiency of up to 100 percent and high energy efficiency, and can also obtain the absorption and emission of photons with different wavelengths by controlling the particle size of the quantum dots.
The rapid development of image processing technology has promoted the generation and development of image recognition technology, and has gradually become an important component in the field of artificial intelligence. Here, the computer is used for processing, analyzing and understanding the label image, classifying and extracting important features on the label, and effectively eliminating useless redundant features, so that the identification of the anti-counterfeit label is realized. Whether the identified image is from the tag library can be rapidly judged through the learning of the tag library.
With the increasing frequency of global business activities, the hazards of counterfeiting do not vary in a small amount. The use experience of consumers is influenced by counterfeit daily consumer goods, the counterfeit medicines pose a great threat to the safety of patients and public health, and the counterfeit high-tech products cause great economic loss in developed countries and under-developed countries. The update and upgrade of the anti-counterfeiting technology are powerful attacks on counterfeit products. The demand for the next generation of anti-counterfeiting technology is enormous and growing in global economy, security, and human health. At this time, a graphical anti-counterfeit label which can achieve both easy detection and anti-counterfeit capability is developed, and the requirements of the times are met.
Disclosure of Invention
The invention aims to provide a quantum dot anti-counterfeiting label capable of realizing double-layer identification based on an optical convex surface and a preparation method thereof, the quantum dot anti-counterfeiting label is simple in process, low in cost, stable in chemical property, capable of adapting to flexible stretchable application, capable of realizing double-layer progressive anti-counterfeiting of various colors by combining rich colors of quantum dots, and capable of realizing image identification by establishing two sets of intelligent label learning libraries. The double-layer identification design of the quantum dot anti-counterfeiting label has both easy detection and anti-counterfeiting capability, and the first layer of identification only needs the portable lens matched with the excitation light source to be connected with the electronic equipment, so that the daily detection is easy; the accuracy of the second layer identification pattern can reach the nanometer level, and the anti-counterfeiting capability can be ensured to be strong enough.
In order to achieve the purpose, the technical scheme of the invention is as follows: a quantum dot anti-counterfeiting label capable of being identified in double layers based on an optical convex surface comprises a substrate layer, an optical convex surface layer and a quantum dot light-emitting layer which are arranged on the substrate layer, and a cover plate layer positioned on the uppermost layer; the optical convex surface layer and the quantum dot light-emitting layer are in mutual contact, embedding or coating relation.
In an embodiment of the present invention, the material used for the substrate layer is a light-transmitting material or a transparent base material, the light-transmitting material includes, but is not limited to, glass and indium tin oxide, and the transparent base material includes, but is not limited to, a polydimethylsiloxane film.
In one embodiment of the present invention, the optical convex surface layer is prepared by a surface spreading process including, but not limited to, drop coating and spin coating.
In an embodiment of the present invention, the optical protrusion surface layer is obtained by dropping and spin-coating individual optical particles, the optical particles are randomly distributed on the substrate layer and have controllable density, the material of the optical particles includes but is not limited to optical glass, optical crystal, and optical plastic, the shape of the optical particles includes but is not limited to spherical, hemispherical, square, or other irregular shapes, the light uniformizing effect of the optical particles is good, and the particle diameter of the optical particles is 1-50 μm.
In an embodiment of the invention, the quantum dot light emitting layer is prepared by a solution patterning process including, but not limited to, inkjet printing and screen printing.
In an embodiment of the present invention, the luminescent material of the quantum dot luminescent layer includes, but is not limited to, perovskite quantum dots, cadmium selenide quantum dots, indium phosphide quantum dots, and graphene quantum dots, the quantum dots are dispersed in a single or mixed solvent, a polymer or a gel material may be added to the quantum dot dispersion liquid, the particle size of the quantum dot luminescent core is 1-30 nm, and the quantum dots may be coated with a shell or have a ligand thickness of 1-1000 nm.
In an embodiment of the present invention, the cover plate layer is made of a transparent material including, but not limited to, glass, indium tin oxide, and a polydimethylsiloxane film, and is made of a material compatible with the substrate layer, and the cover plate layer covers the quantum dot light emitting layer in a protective gas environment, has a size consistent with that of the substrate layer, and can be sealed with an ultraviolet light curing adhesive.
The invention also provides a preparation method of the quantum dot anti-counterfeiting label based on the optical convex surface and capable of realizing double-layer identification, which comprises the following steps:
step S1, preparing and cutting a transparent material of a substrate layer;
step S2, preparing an optical convex surface layer on the substrate layer;
step S3, preparing a quantum dot light-emitting layer on the optical convex surface layer;
step S4, covering a cover plate layer on the quantum dot light-emitting layer;
s5, collecting the luminous patterns on the upper surface of the optical convex surface as first layer of anti-counterfeiting information;
and step S6, collecting the luminous patterns around the optical convex surface as the second layer of anti-counterfeiting information.
In an embodiment of the present invention, in step S5, the shape of the surface light-emitting pattern on the optical protrusion surface is adapted to the shape of the optical protrusion, including but not limited to a sphere, a hemisphere, a square, or other shapes.
In an embodiment of the invention, in step S6, the light-emitting pattern around the optical protrusion surface is a dot-like, filament-like, net-like, or maze-like pattern deposited after evaporation of a solvent used for the quantum dot light-emitting layer.
Compared with the prior art, the invention has the following beneficial effects:
(1) the light-homogenizing and light-condensing capacity of the optical particles is utilized, so that the whole luminescent particles can emit light, and meanwhile, different patterns which cannot be copied can be acquired at different heights of the same plane area by matching the space difference caused by the optical convex surface with different light excitation intensities.
(2) The quantum dot anti-counterfeiting label is prepared by combining the space convex surface with a solution method, the process is simple, the cost is low, the chemical property is stable, the quantum dot anti-counterfeiting label can be adapted to flexible stretching application, and double-layer progressive anti-counterfeiting of various colors can be realized by combining rich colors of quantum dots.
(3) The double-layer identification design of the quantum dot anti-counterfeiting label has both easy detection and anti-counterfeiting capability, the first layer of identification main body is micron-sized optical particles, and the portable lens is only required to be matched with an excitation light source to be connected with electronic equipment, so that the daily detection is easy; the accuracy of the second layer of identification patterns can reach the nanometer level, the texture has stronger randomness and carries more identification characteristics, and enough strong anti-counterfeiting capability can be ensured.
Drawings
Fig. 1 is a flow chart of preparation of a quantum dot anti-counterfeit label capable of double-layer identification.
Fig. 2 is a schematic diagram of a cross-sectional structure of a quantum dot anti-counterfeit label capable of double-layer identification.
Fig. 3 is a bright-field image of randomly scattered optical particles on a double-layer identifiable quantum dot anti-counterfeiting label substrate.
FIG. 4 is a surface light-emitting pattern on an optical convex surface of a quantum dot anti-counterfeit label capable of being identified in a double-layer mode.
FIG. 5 is a light-emitting pattern on a substrate around an optical convex surface of a double-layer recognizable quantum dot anti-counterfeiting label.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides an optical convex surface-based quantum dot anti-counterfeiting label capable of realizing double-layer identification, which comprises a substrate layer, an optical convex surface layer and a quantum dot light-emitting layer, wherein the optical convex surface layer and the quantum dot light-emitting layer are arranged on the substrate layer, and a cover plate layer is positioned on the uppermost layer; the optical convex surface layer and the quantum dot light-emitting layer are in mutual contact, embedding or coating relation.
The invention also provides a preparation method of the quantum dot anti-counterfeiting label based on the optical convex surface and capable of realizing double-layer identification, which comprises the following steps:
step S1, preparing and cutting a transparent material of a substrate layer;
step S2, preparing an optical convex surface layer on the substrate layer;
step S3, preparing a quantum dot light-emitting layer on the optical convex surface layer;
step S4, covering a cover plate layer on the quantum dot light-emitting layer;
s5, collecting the luminous patterns on the upper surface of the optical convex surface as first layer of anti-counterfeiting information;
and step S6, collecting the luminous patterns around the optical convex surface as the second layer of anti-counterfeiting information.
The invention relates to a quantum dot anti-counterfeiting label capable of being identified in double layers based on an optical convex surface and a preparation method thereof. The present invention provides preferred embodiments, but should not be construed as being limited to the embodiments set forth herein. In the figures, the thicknesses of layers and regions are exaggerated for clarity, but as a schematic illustration should not be considered to reflect strictly the geometric scaling.
This reference figure is a schematic illustration of an idealized embodiment of the present invention which should not be construed as limited to the particular shapes of regions illustrated in the figures but are to include resulting shapes such as deviations caused by manufacturing. In the present embodiments, all are represented by rectangles, and the representation in the figures is schematic, but this should not be construed as limiting the scope of the invention.
Example 1
As shown in fig. 1 and 2, the double-layer identifiable quantum dot anti-counterfeit label based on the optical convex surface comprises the following specific preparation steps:
step 1: preparation of quantum dot light emitting layer dispersion
500mg of yellow light quantum dot light-emitting powder is accurately weighed by an electronic balance and put into a sample bottle containing about 3mL of toluene solvent. Stirring for about 1 hour at normal temperature by using a constant-temperature magnetic stirrer, and transferring the mixture into a small culture dish after the mixture is uniformly dispersed. 1.5g of CR-168A thermal gel is weighed by an electronic balance and added into a small culture dish, and after stirring for about 1 hour on a constant-temperature magnetic stirrer, the toluene solvent is continuously evaporated during the stirring, so that the gallium nitride dispersion liquid with moderate viscosity is prepared. The product is sealed and stored.
Step 2: a substrate layer transparent material 110 is prepared. Polydimethylsiloxane (PDMS) was prepared and cut as the stretchable substrate layer transparent material 110.
And step 3: preparation of the optically convex facing layer 120.
Luminescent glass microspheres with a diameter of about 50 μm were added to a mixed solvent of ethanol and a surfactant to prepare an optical particle dispersion of 4 mg/ml. As shown in fig. 3, the luminescent glass microspheres are randomly dispersed on the surface of the substrate layer by a drop coating method to complete the preparation of the optical convex surface layer 120.
And 4, step 4: and (3) preparing the quantum dot light emitting layer 130. The quantum dot light-emitting layer 130 is prepared on the surface of the optical convex surface layer 120 by a screen printing method and has a thickness of about 20 μm.
And 5: a cover plate layer 140 is coated on the quantum dot light emitting layer. The cover plate layer 140 is also made of polydimethylsiloxane material, and is disposed parallel to the substrate layer 110, and is cured and encapsulated with UV glue around in a glove box nitrogen environment.
Step 6: the surface luminous pattern and the surrounding luminous pattern on the optical convex surface are collected.
As shown in fig. 4 and 5, when the fluorescence microscope is used to collect the light pattern on the upper surface of the optical protrusion, the blue light with lower light intensity is used for excitation, and the objective lens with lower magnification is used for focusing on the upper surface of the optical protrusion. When a fluorescence microscope is used for collecting luminous patterns around the optical convex surface, the luminous patterns are excited by blue light with strong light intensity, and the high-magnification objective lens is used for focusing on the surface of the substrate around the optical convex surface.
Therefore, the identification of the images can be realized by establishing two sets of intelligent label learning libraries.
Example 2
As shown in fig. 1 and 2, the double-layer identifiable quantum dot anti-counterfeit label based on the optical convex surface comprises the following specific preparation steps:
step 1: preparation of quantum dot light emitting layer dispersion
30mg of red light quantum dot light-emitting powder was accurately weighed by an electronic balance and put into a sample bottle containing about 3mL of a mixed solvent of toluene and o-dichlorobenzene in a ratio of 4: 1.
Step 2: a substrate layer transparent material 110 is prepared. Indium Tin Oxide (ITO) was prepared and cut as the substrate layer transparent material 110.
And step 3: preparation of the optically convex facing layer 120.
Luminescent glass microspheres with a diameter of about 5 μm were added to a mixed solvent of ethanol and a surfactant to prepare an optical particle dispersion of 4 mg/ml. As shown in fig. 3, the luminescent glass microspheres are randomly dispersed on the surface of the substrate layer by spin coating at 1000RPM for 40s, the optical particle dispersion is ultrasonically treated before each spin coating, the density can be controlled by multiple spin coatings, and the optical bump surface layer 120 is prepared after drying.
And 4, step 4: and (3) preparing the quantum dot light emitting layer 130. The quantum dot light-emitting layer 130 is prepared on the surface of the optical convex surface layer 120 by an ink-jet printing method. The piezoelectric nozzle used for ink-jet printing is 30 μm, the distance between ink drops is 400 μm, and each ink drop can cover 10-100 optical particles.
And 5: a cover plate layer 140 is coated on the quantum dot light emitting layer. The cover plate layer 140 is made of glass or indium tin oxide, the cover plate layer 140 is arranged parallel to the substrate layer 110, and the periphery of the cover plate layer is cured and packaged by UV glue in a glove box nitrogen environment.
Step 6: the surface luminous pattern and the surrounding luminous pattern on the optical convex surface are collected.
As shown in fig. 4 and 5, when the fluorescence microscope is used to collect the light pattern on the upper surface of the optical protrusion, the blue light with lower light intensity is used for excitation, and the objective lens with lower magnification is used for focusing on the upper surface of the optical protrusion. When a fluorescence microscope is used for collecting luminous patterns around the optical convex surface, the luminous patterns are excited by blue light with strong light intensity, and the high-magnification objective lens is used for focusing on the surface of the substrate around the optical convex surface.
Therefore, the identification of the images can be realized by establishing two sets of intelligent label learning libraries.
The above examples mainly illustrate a double-layer identifiable quantum dot anti-counterfeit label based on an optical convex surface. Although only a few embodiments of the present invention have been described, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (10)
1. The quantum dot anti-counterfeiting label capable of being identified in double layers based on the optical convex surface is characterized by comprising a substrate layer, the optical convex surface layer and a quantum dot light-emitting layer which are arranged on the substrate layer, and a cover plate layer positioned on the uppermost layer; the optical convex surface layer and the quantum dot light-emitting layer are in mutual contact, embedding or coating relation.
2. The optical raised surface-based double-layer identifiable quantum dot anti-counterfeiting label according to claim 1, wherein the material adopted by the substrate layer is a light-transmitting material or a transparent base material, the light-transmitting material includes but is not limited to glass and indium tin oxide, and the transparent base material includes but is not limited to polydimethylsiloxane film.
3. The optical convex surface-based double-layer identification quantum dot anti-counterfeiting label according to claim 1, wherein the optical convex surface layer is prepared by a surface spreading treatment process including but not limited to drop coating and spin coating.
4. The double-layer identifiable quantum dot anti-counterfeiting label based on the optical convex surface as claimed in claim 1, wherein the optical convex surface layer is obtained by dropping and spin-coating individual optical particles, the optical particles are randomly distributed on the substrate layer and have controllable density, the material of the optical particles includes but is not limited to optical glass, optical crystal and optical plastic, the shape of the optical particles includes but is not limited to spherical, hemispherical, square or other irregular shape, the light homogenizing effect of the optical particles is good, and the particle diameter is 1-50 μm.
5. The optical convex surface-based double-layer identification quantum dot anti-counterfeiting label according to claim 1, wherein the quantum dot light-emitting layer is prepared by a solution patterning process including but not limited to inkjet printing and screen printing.
6. The double-layer identifiable quantum dot anti-counterfeiting label based on the optical convex surface as claimed in claim 1, wherein the luminescent material of the quantum dot luminescent layer includes but is not limited to perovskite quantum dots, cadmium selenide quantum dots, indium phosphide quantum dots, and graphene quantum dots, the quantum dots are dispersed in a single or mixed solvent, a polymer or a gel material can be added into the quantum dot dispersion liquid, the particle size of the quantum dot luminescent core is 1-30 nm, and the quantum dots can be coated with a shell or ligand with the thickness of 1-1000 nm.
7. The optical raised surface-based double-layer identifiable quantum dot anti-counterfeiting label according to claim 1, wherein the cover plate layer is made of a transparent material including but not limited to glass, indium tin oxide and polydimethylsiloxane film, the cover plate layer is made of a material compatible with the substrate layer, the cover plate layer covers the quantum dot light emitting layer under a protective gas environment, the size of the cover plate layer is consistent with that of the substrate layer, and the periphery of the cover plate layer can be sealed by ultraviolet light curing glue.
8. The preparation method of the double-layer identifiable quantum dot anti-counterfeiting label based on the optical convex surface as claimed in any one of claims 1 to 7 is characterized by comprising the following steps:
step S1, preparing and cutting a transparent material of a substrate layer;
step S2, preparing an optical convex surface layer on the substrate layer;
step S3, preparing a quantum dot light-emitting layer on the optical convex surface layer;
step S4, covering a cover plate layer on the quantum dot light-emitting layer;
s5, collecting the luminous patterns on the upper surface of the optical convex surface as first layer of anti-counterfeiting information;
and step S6, collecting the luminous patterns around the optical convex surface as the second layer of anti-counterfeiting information.
9. The method for preparing the double-layer recognizable quantum dot anti-counterfeit label based on the optical protrusion surface as claimed in claim 8, wherein in step S5, the shape of the surface light-emitting pattern on the optical protrusion surface is adapted to the shape of the optical protrusion, including but not limited to spherical, hemispherical, square or other irregular shapes.
10. The method for preparing the quantum dot anti-counterfeit label based on the optical convex surface and capable of being identified in the double-layer manner as claimed in claim 8, wherein in step S6, the light-emitting pattern around the optical convex surface is a dot-like, thread-like, net-like or labyrinth-like pattern deposited after the solvent of the solution used for the quantum dot light-emitting layer is evaporated.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113147215A (en) * | 2021-05-24 | 2021-07-23 | 中钞印制技术研究院有限公司 | Transparent anti-counterfeiting element, manufacturing method and detection method thereof, detection equipment thereof and security article |
| CN113758956A (en) * | 2021-08-23 | 2021-12-07 | 中国科学院上海光学精密机械研究所 | PUF device based on microcavity laser |
| CN114045165A (en) * | 2021-12-03 | 2022-02-15 | 福州大学 | Method for realizing multi-color variable pattern by long afterglow/quantum dot composite luminescent material |
| CN114842736A (en) * | 2022-05-12 | 2022-08-02 | 重庆大学 | Quantum dot material-based encoding label and packaging method thereof |
| CN116002689A (en) * | 2022-12-15 | 2023-04-25 | 浙江大学 | Silicon-based optical PUF, preparation method and application thereof |
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