CN113956869A - Manufacturing method of dielectric microsphere patterned array up-conversion luminescence flexible film applied to anti-counterfeiting mark - Google Patents
Manufacturing method of dielectric microsphere patterned array up-conversion luminescence flexible film applied to anti-counterfeiting mark Download PDFInfo
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- 239000004005 microsphere Substances 0.000 title claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 32
- 238000004020 luminiscence type Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000059 patterning Methods 0.000 claims abstract description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 77
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 77
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 42
- 239000000203 mixture Substances 0.000 claims description 31
- 238000004528 spin coating Methods 0.000 claims description 25
- 239000002105 nanoparticle Substances 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 24
- 239000000654 additive Substances 0.000 claims description 18
- 230000000996 additive effect Effects 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 239000002390 adhesive tape Substances 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 230000005284 excitation Effects 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 9
- 239000011258 core-shell material Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 238000005411 Van der Waals force Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 5
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000001748 luminescence spectrum Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
- G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
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Abstract
The invention discloses a manufacturing method of a dielectric microsphere patterning array up-conversion luminescence flexible film applied to an anti-counterfeiting mark. The existing preparation method of the anti-counterfeiting mark has the defects of complex preparation process, high cost, insufficient protection of the authenticity of goods and the like. The excellent flexibility and optical performance of the dielectric microsphere patterned array upconversion luminescent flexible film in the manufacturing method provide an alternative scheme for the application of the wearable near-infrared anti-counterfeiting mark.
Description
Technical Field
The invention relates to the technical field of optical anti-counterfeiting, and provides a preparation method of a dielectric microsphere patterned array up-conversion luminescent flexible film applied to an anti-counterfeiting mark.
Background
With the development of commodity economy, the appearance of counterfeit and shoddy products has had serious adverse effects on various aspects of the market. It is important to develop advanced anti-counterfeit strategies and anti-counterfeit security technologies to combat counterfeit goods and to avoid a series of problems caused by counterfeit products. As a unique identification mode, the anti-counterfeiting mark is convenient to identify and difficult to copy, and has attracted social attention. However, the existing preparation method of the anti-counterfeiting mark has the defects of complex preparation process, high cost, insufficient protection of the authenticity of the commodity and the like. The development of low-cost, high-yield anti-counterfeit labels has become an urgent practical need for various goods.
In order to solve the existing problems, optical anti-counterfeiting marks based on optical materials such as semiconductor quantum dots, organic dyes and the like commonly used in traditional anti-counterfeiting ink are produced. Although these optical materials have good fluorescence properties, their further applications in the field of security are limited due to their disadvantages of strong photobleaching, high toxicity and easy replication. The up-conversion nanoparticle (UCNP) material as a new luminescent material has the characteristics of high optical stability, long fluorescence lifetime, low toxicity and the like, and a near infrared source for exciting up-conversion luminescence is difficult to obtain, so that the up-conversion anti-fake label is difficult to copy, and the up-conversion anti-fake label becomes a research hotspot in the current safety anti-fake technical field. At present, a QR code based on RGB up-conversion ink and a multicolor anti-counterfeiting pattern encrypted by using a core-shell up-conversion fluorescent material are prepared by using printing or photolithography, however, the existing up-conversion anti-counterfeiting technology has many limitations, a complex thermal decomposition preparation process of core-shell up-conversion nanoparticles requires a higher reaction temperature and a longer reaction period, and the photolithography and the inkjet printing technology have the disadvantage of high cost, which further hinders the wide application thereof. Although the upconversion luminescent material has a wide application potential, the luminescence efficiency is usually very low, and the efficient luminescence is usually realized by raising the excitation power, so it is very important to find a structure for effectively raising the upconversion luminescence efficiency under low power.
The dielectric microsphere array structure has the advantages of convenience in preparation, simple structure, good stability, low price and the like, plays an important role in mesoscopic light field regulation and control, becomes an effective way for realizing up-conversion luminescence regulation and control, realizes the application of the anti-counterfeiting mark under low power by combining with high-concentration up-conversion ink, has extremely important scientific research significance and potential application value, and has no report on the preparation method of the up-conversion luminescence flexible film for patterning dielectric microspheres.
Disclosure of Invention
The invention aims to provide a preparation method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark by utilizing the function of dielectric microsphere optical field regulation.
Another objective of the present invention is to provide an excitation power dependent up-conversion luminescence anti-counterfeit mark.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark comprises the following steps:
step 1: NaYF is added4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Core-shell upconversion nanoparticles (UCNPs) are suspended in the dispersion;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution;
and step 3: mixing the UCNP suspension and the PMMA solution, and then placing the mixture solution in a vacuum chamber to remove air bubbles;
and 4, step 4: spin-coating a UCNP/PMMA mixture solution on a glass substrate, standing in air and curing to obtain a UCNP/PMMA mixture film;
and 5: using UCNP solution as ink to draw a required anti-counterfeiting pattern on the UCNP/PMMA film;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA film, spraying dried transparent dielectric microspheres at the patterned positions of the mold, mechanically pressurizing through a 3M low-viscosity adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for multiple times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape. Obtaining a single-layer patterned dielectric microsphere array through multiple pressing and stripping;
and 7: and irradiating the patterned UCNP/PMMA film by using laser to realize the application of the upconversion luminous flexible film on the dielectric microsphere patterned array depending on the excitation power.
In the above technical scheme, in step 1, the average size of the upconversion nanoparticles is 30-40nm, the dispersion solvent is cyclohexane, and the concentration of the upconversion nanoparticles is 5 mg/mL.
In the technical scheme, in the step 2, the PMMA solution consists of powder, solvent and additive, wherein the crystal grain size of the PMMA powder is 70-100 mu m, and the PMMA powder is dissolved in toluene according to the mass ratio of 0.3-1 wt%; the additive in the PMMA solution is acetone, and the mass of the additive is 0.05-0.6% of that of the solvent.
In the above technical solution, in step 3, the UCNP suspension and the PMMA solution are mixed by repeatedly pumping, so that a uniform mixture solution is obtained.
In the above technical scheme, in step 4, the concentration of UCNP in the mixture solution is 0.02-0.1mg/mL, the spin-coating speed is set to 1500-3000r/min, and the rotation time is set to 15-30 s.
In the above technical solution, in step 5, the UCNP solution with a concentration of 5mg/mL for drawing the anti-counterfeit pattern is used as ink.
In the above technical scheme, in step 7, the excitation light source is a 980nm laser with adjustable power, and the infrared dual-mode anti-counterfeiting function is realized by adjusting the power.
Compared with the prior art, the invention has the following advantages:
(1) the manufacturing method of the dielectric microsphere patterned array up-conversion luminescence flexible film applied to the anti-counterfeiting mark, provided by the invention, has the advantages of simple preparation method, low cost, no limitation of substrate materials, high stability and convenience in recycling;
(2) according to the manufacturing method of the upconversion luminous flexible film applied to the dielectric microsphere patterned array of the anti-counterfeiting mark, provided by the invention, according to different requirements of practical application, a drawn pattern can be adjusted or the pattern of the dielectric microsphere array can be changed so as to realize anti-counterfeiting requirements of different scenes;
(3) the dielectric microsphere patterned array up-conversion luminescence flexible film applied to the anti-counterfeiting mark combines the regulation and control effect of the dielectric microspheres on the optical field, has stable physical and chemical properties in the air, realizes anti-counterfeiting application under low-power near infrared light excitation, and has good application prospect in the technical field of optical anti-counterfeiting.
Drawings
FIG. 1 is a schematic view showing a process for manufacturing a dielectric microsphere patterned array upconversion luminescent flexible film for use in an anti-counterfeit label;
FIG. 2 shows the power density at 43mW/cm2The 980nm near infrared light excites the dielectric microsphere patterned array to convert the anti-counterfeiting pattern photo of the luminous flexible film;
FIG. 3 shows the power density at 56mW/cm2The 980nm near infrared light excites the dielectric microsphere patterned array to convert the anti-counterfeiting pattern photo of the luminous flexible film;
FIG. 4 shows an upconversion luminescence spectrum of an upconversion luminescent flexible film after enhancement by a patterned array of dielectric microspheres;
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark comprises the following steps:
step 1: NaYF with average size of 40nm4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Suspending core-shell type upconversion nanoparticles (UCNPs) in dispersion liquid cyclohexane to obtain upconversion nanoparticles with the concentration of 5 mg/mL;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution, wherein the PMMA solution consists of powder, a solvent and additives, the crystal grain size of the PMMA powder is 100 mu m, the PMMA powder is dissolved in the toluene according to the mass ratio of 0.5 wt%, the additive in the PMMA solution is acetone, and the mass of the additive is 0.2% of the mass of the solvent;
and step 3: uniformly mixing the UCNP suspension and the PMMA solution in a repeated suction mode, and then placing the mixture in a vacuum chamber to remove bubbles to obtain a mixture solution with the upconversion nano particle concentration of 0.02 mg/mL;
and 4, step 4: and spin-coating the mixture solution with the concentration of the upconversion nanoparticles of 0.02mg/mL on a glass substrate, wherein the spin-coating speed is 1000rpm/min at a low speed, the spin-coating time is 15s and 2000rpm/min at a high speed, and the spin-coating time is 20 s. Standing and curing in the air after the spin coating is finished to obtain a UCNP/PMMA mixture film;
and 5: drawing a required anti-counterfeiting pattern on the UCNP/PMMA mixture film by using a UCNP solution of 5mg/mL as ink;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA film, spraying dried transparent dielectric microspheres at the patterned positions of the mold, mechanically pressurizing through a 3M low-viscosity adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for multiple times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape. Obtaining a single-layer patterned dielectric microsphere array through multiple pressing and stripping;
and 7: irradiating the patterned UCNP/PMMA film by 980nm laser with adjustable power, and realizing the application of the dielectric microsphere patterned array up-conversion luminescence flexible film depending on the excitation power.
Example 2
A manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark comprises the following steps:
step 1: NaYF with average size of 40nm4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Suspending core-shell type upconversion nanoparticles (UCNPs) in dispersion liquid cyclohexane to obtain upconversion nanoparticles with the concentration of 5 mg/mL;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution, wherein the PMMA solution consists of powder, a solvent and additives, the crystal grain size of the PMMA powder is 100 mu m, the PMMA powder is dissolved in the toluene according to the mass ratio of 0.7 wt%, the additive in the PMMA solution is acetone, and the mass of the additive is 0.3% of the mass of the solvent;
and step 3: uniformly mixing the UCNP suspension and the PMMA solution in a repeated suction mode, and then placing the mixture in a vacuum chamber to remove bubbles to obtain a mixture solution with the upconversion nano particle concentration of 0.04 mg/mL;
and 4, step 4: and spin-coating the mixture solution with the concentration of the upconversion nanoparticles of 0.04mg/mL on a glass substrate, wherein the spin-coating speed is 1000rpm/min at a low speed, the spin-coating time is 15s and 2000rpm/min at a high speed, and the spin-coating time is 20 s. Standing and curing in the air after the spin coating is finished to obtain a UCNP/PMMA mixture film;
and 5: drawing a required anti-counterfeiting pattern on the UCNP/PMMA mixture film by using a UCNP solution of 5mg/mL as ink;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA film, spraying dried transparent dielectric microspheres at the patterned positions of the mold, mechanically pressurizing through a 3M low-viscosity adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for multiple times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape. Obtaining a single-layer patterned dielectric microsphere array through multiple pressing and stripping;
and 7: irradiating the patterned UCNP/PMMA film by 980nm laser with adjustable power, and realizing the application of the dielectric microsphere patterned array up-conversion luminescence flexible film depending on the excitation power.
Embodiment 3
A manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark comprises the following steps:
step 1: NaYF with average size of 40nm4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Suspension of core-shell type upconversion nanoparticles (UCNPs) in cyclohexane dispersion to obtain upconversion nanoparticlesThe concentration is 5 mg/mL;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution, wherein the PMMA solution consists of powder, a solvent and additives, the crystal grain size of the PMMA powder is 100 mu m, the PMMA powder is dissolved in the toluene according to the mass ratio of 0.9 wt%, the additive in the PMMA solution is acetone, and the mass of the additive is 0.4% of the mass of the solvent;
and step 3: uniformly mixing the UCNP suspension and the PMMA solution in a repeated suction mode, and then placing the mixture in a vacuum chamber to remove bubbles to obtain a mixture solution with the upconversion nano particle concentration of 0.06 mg/mL;
and 4, step 4: and spin-coating the mixture solution with the concentration of the upconversion nanoparticles of 0.06mg/mL on the glass substrate, wherein the spin-coating speed is 1000rpm/min at a low speed, the spin-coating time is 15s and 2000rpm/min at a high speed, and the spin-coating time is 20 s. Standing and curing in the air after the spin coating is finished to obtain a UCNP/PMMA mixture film;
and 5: drawing a required anti-counterfeiting pattern on the UCNP/PMMA mixture film by using a UCNP solution of 5mg/mL as ink;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA film, spraying dried transparent dielectric microspheres at the patterned positions of the mold, mechanically pressurizing through a 3M low-viscosity adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for multiple times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape. Obtaining a single-layer patterned dielectric microsphere array through multiple pressing and stripping;
and 7: irradiating the patterned UCNP/PMMA film by 980nm laser with adjustable power, and realizing the application of the dielectric microsphere patterned array up-conversion luminescence flexible film depending on the excitation power.
Example 4
A manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark comprises the following steps:
step 1: NaYF with average size of 40nm4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Suspending core-shell type upconversion nanoparticles (UCNPs) in dispersion liquid cyclohexane to obtain upconversion nanoparticles with the concentration of 5 mg/mL;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution, wherein the PMMA solution consists of powder, a solvent and additives, the crystal grain size of the PMMA powder is 100 mu m, the PMMA powder is dissolved in the toluene in a mass ratio of 1 wt%, the additive in the PMMA solution is acetone, and the mass of the additive is 0.6% of the mass of the solvent;
and step 3: uniformly mixing the UCNP suspension and the PMMA solution in a repeated suction mode, and then placing the mixture in a vacuum chamber to remove bubbles to obtain a mixture solution with the upconversion nano particle concentration of 0.07 mg/mL;
and 4, step 4: and spin-coating the mixture solution with the concentration of the upconversion nanoparticles of 0.07mg/mL on a glass substrate, wherein the spin-coating speed is low and the spin-coating speed is high and the speed is 1000rpm/min, the spin-coating time is 15s and the high speed is 2500rpm/min, and the spin-coating time is 20 s. Standing and curing in the air after the spin coating is finished to obtain a UCNP/PMMA mixture film;
and 5: drawing a required anti-counterfeiting pattern on the UCNP/PMMA mixture film by using a UCNP solution of 5mg/mL as ink;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA film, spraying dried transparent dielectric microspheres at the patterned positions of the mold, mechanically pressurizing through a 3M low-viscosity adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for multiple times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape. Obtaining a single-layer patterned dielectric microsphere array through multiple pressing and stripping;
and 7: irradiating the patterned UCNP/PMMA film by 980nm laser with adjustable power, and realizing the application of the dielectric microsphere patterned array up-conversion luminescence flexible film depending on the excitation power.
The anti-counterfeiting luminous effect of the embodiment 1, namely the anti-counterfeiting luminous effects of the figures 2 and 3 in the description of the attached drawings are similar to those of the embodiments 2-4, and only the difference in the excitation power dependence is generated in the anti-counterfeiting application.
Finally, the above examples of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This is not exhaustive of all embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A manufacturing method of a dielectric microsphere patterned array up-conversion luminescence flexible film applied to an anti-counterfeiting mark is characterized by comprising the following steps:
step 1: NaYF is added4:Yb3+/Tm3+@NaYF4:Yb3+/Nd3+Suspending core-shell type up-conversion nanoparticles (UCNPs) in the dispersion liquid to obtain UCNP suspension;
step 2: dissolving polymethyl methacrylate (PMMA) powder in toluene to obtain a PMMA solution; the PMMA solution consists of powder, solvent toluene and additive, wherein the PMMA powder is dissolved in the toluene with the mass ratio of 0.3-1 wt%; the additive in the PMMA solution is acetone, and the mass of the additive is 0.05-0.6 wt% of that of the solvent toluene.
And step 3: mixing the UCNP suspension and PMMA solution, and then placing the mixture in a vacuum chamber to remove air bubbles; the concentration of UCNP in the mixture is 0.02-0.1 mg/mL;
and 4, step 4: spin-coating a UCNP/PMMA mixture solution on a glass substrate, standing in air and curing to obtain a UCNP/PMMA mixture film;
and 5: using UCNP solution as ink to draw a required anti-counterfeiting pattern on the UCNP/PMMA mixture film;
step 6: attaching a patterned mold to the surface of a UCNP/PMMA (unified micro-porous network)/PMMA (polymethyl methacrylate) film, spraying dried transparent dielectric microspheres at the patterning position of the mold, mechanically pressurizing by using a 3M adhesive tape, adhering the microspheres to the surface of the film through electrostatic contact and van der Waals force, repeatedly pressing for many times, and removing the microspheres which are not adhered to the surface of the film after peeling off the 3M adhesive tape; and pressing and stripping for multiple times to obtain a single-layer patterned dielectric microsphere array.
2. The method for manufacturing the upconversion luminescent flexible film applied to the dielectric microsphere patterned array of the anti-counterfeiting mark according to claim 1, wherein the method comprises the following steps: in the step 1, the average size of the upconversion nanoparticles is 30-40nm, the dispersion solvent is cyclohexane, and the concentration of the upconversion nanoparticles is 5 mg/mL.
3. The manufacturing method according to claim 1, characterized in that: the PMMA powder has a grain size of 70-100 μm.
4. The manufacturing method according to claim 1, characterized in that: in step 4, the spin coating speed is set to 1500-.
5. The manufacturing method according to claim 1, characterized in that: in the step 5, the UCNP solution with the concentration of 5mg/mL for drawing the anti-counterfeiting pattern is used as ink, and the concentration of the upconversion nano particles in the mixture film is 0.02-0.1 mg/mL.
6. Use of the film prepared by the method of claim 1, wherein the patterned UCNP/PMMA film is irradiated with a laser to achieve the use of an excitation power dependent flexible film for upconversion luminescence in a patterned array of dielectric microspheres.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686227A (en) * | 2022-03-24 | 2022-07-01 | 华南理工大学 | Single-matrix rare earth-based multimode luminescent flexible film and preparation method and application thereof |
| CN114708789A (en) * | 2022-04-17 | 2022-07-05 | 西北工业大学 | Method for regulating morphology of amorphous silicon polymer with variable flower shape and method for preparing unclonable anti-counterfeiting mark |
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