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Asymmetric photonic crystal film capable of changing colors along with angles as well as preparation method and application of asymmetric photonic crystal film

A photonic crystal and varicolor technology, which is applied in the field of asymmetrical photonic crystal film and its preparation, and achieves the effects of improving anti-counterfeiting ability, easy operation and simple preparation method.

Active Publication Date: 2022-02-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently prepared photonic crystal anti-counterfeiting patterns show a symmetrical blue shift change law with the change of viewing angle.

Method used

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  • Asymmetric photonic crystal film capable of changing colors along with angles as well as preparation method and application of asymmetric photonic crystal film
  • Asymmetric photonic crystal film capable of changing colors along with angles as well as preparation method and application of asymmetric photonic crystal film
  • Asymmetric photonic crystal film capable of changing colors along with angles as well as preparation method and application of asymmetric photonic crystal film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Fe with a particle size of 160nm 3 o 4 @PVP magnetic nanoparticles are dispersed into a mixture composed of monomer hydroxyethyl methacrylate (HEMA), crosslinker ethylene glycol dimethacrylate (EGDMA), photoinitiator 2-hydroxy-2-methyl-1-benzene In the prepolymerization liquid that hydroxyacetone (HMPP) forms, the concentration of HEMA in the prepolymerization liquid is 0.899g / mL, and the concentration of HMPP is 3.84% of monomer HEMA quality, and the concentration of EGDMA is 14.6% of monomer HEMA monomer, Fe 3 o 4The concentrations of @PVP magnetic nanoparticles are 3.12mg / ml, 6.24mg / ml, 9.36mg / ml, 12.48mg / ml, 15.60mg / ml, 18.72mg / ml respectively.

[0044] (2) Coating different Fe on the surface of the substrate 3 o 4 The pre-polymerization solution with the concentration of @PVP magnetic nanoparticles is cured with a UV lamp for 60s in a vertical uniform magnetic field of 300 Gs (the direction of the magnetic field is perpendicular to the surface of the subst...

Embodiment 2

[0047] (1) Fe with a particle size of 160nm 3 o 4 @PVP magnetic nanoparticles are dispersed into a mixture composed of monomer hydroxyethyl methacrylate (HEMA), crosslinker ethylene glycol dimethacrylate (EGDMA), photoinitiator 2-hydroxy-2-methyl-1-benzene In the pre-polymerization liquid composed of methyl acetone (HMPP), Fe 3 o 4 The concentration of @PVP is 15.60mg / ml, the concentration of HEMA is 0.899g / mL, the concentration of HMPP is 3.84% of the monomeric HEMA mass, and the concentration of EGDMA is 14.6% of the monomeric HEMA monomer.

[0048] (2) Coat the pre-polymerization liquid on the surface of the substrate, in a vertical uniform magnetic field of 300 Gs (the direction of the magnetic field is perpendicular to the surface of the substrate), and cure it with a UV lamp for 60 seconds. 90µm, 100µm, 110µm, 120µm, 130µm bottom film, in which the bottom film is embedded with a vertically arranged 1D photonic crystal structure.

[0049] figure 2 It is the spectrog...

Embodiment 3

[0051] (1) The method in Example 2 was used to prepare a bottom film with a thickness of 100 μm.

[0052] (2) The surface of the bottom layer film obtained in (1) is coated with pre-polymerization solution, and cured by a UV lamp for 60 seconds in a uniform magnetic field of the same strength inclined at 30° to the surface of the substrate to obtain thicknesses of 30µm, 40µm, and 50µm respectively. , 60µm, and 70µm top film, the bottom film is embedded with a vertically arranged 1D photonic crystal structure, and the top film is embedded with photonic crystal films of different thicknesses arranged at an angle of 30°. The thickness of the photonic crystal film The order is 130µm, 140µm, 150µm, 160µm, 170µm.

[0053] image 3 It is an actual picture of the bottom layer film with a thickness of 100 μm obtained in Example 3 during the deflection of the observation angle from -60° to 60°, taking pictures at intervals of 15° deflection.

[0054] Figure 4 It is the reflectance s...

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Abstract

The invention relates to the technical field of preparation of optical anti-counterfeiting materials, in particular to an asymmetric photonic crystal film capable of changing colors along with angles as well as preparation method and application of the asymmetric photonic crystal film. The photonic crystal film comprises a top layer film and a bottom layer film which are connected, and photonic crystals embedded in the top layer film and the bottom layer film respectively; the photonic crystal is of a 1D chain-shaped structure formed by superparamagnetic nano crystal cluster particles, and the 1D chain-shaped photonic crystal in the top layer film is obliquely oriented relative to the film surface; and the 1D chain-shaped photonic crystal in the bottom layer film is oriented perpendicular to the film surface. According to the asymmetric photonic crystal film capable of changing colors along with the angles, the asymmetry of the color changing along with the angle can be regulated and controlled by changing the inclination angle between the 1D chain-shaped photonic crystal in the top layer film and the film surface, and compared with a traditional photonic crystal anti-counterfeit label, the asymmetric photonic crystal film shows more complex optical change behaviors and higher imitation difficulty; and the anti-counterfeiting capability can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of preparation of optical anti-counterfeiting materials, in particular to an asymmetric photonic crystal film with different colors depending on the angle and its preparation method and application. Background technique [0002] Photonic crystals are composed of periodic arrangements of at least two materials with different refractive indices, and their periodic lattice structures can diffract wavelengths that match visible light, thereby exhibiting bright structural colors. Compared with chemical colors based on dyes or pigments, structural colors eliminate the fading caused by photobleaching, especially without external stimuli, and can also show the characteristics of different colors, so they have great potential in the fields of anti-counterfeiting, camouflage and color display. important application prospects. [0003] At present, researchers using the angle dependence of photonic crystals have develo...

Claims

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Application Information

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IPC IPC(8): G02B1/00
CPCG02B1/005
Inventor 马会茹李家国李刚罗巍官建国
Owner WUHAN UNIV OF TECH
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