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A low-angle-dependent real-time color-changing film based on electric field manipulation

A color-changing film and low-angle technology, which is applied in the field of color-changing materials, can solve the problems of not realizing real-time color changing, and can not achieve real-time color changing, and achieves the effect of low cost and simple manufacturing process

Active Publication Date: 2021-07-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also cannot achieve real-time color change
In the current research on photonic crystal structural color-changing materials, almost no research team considers solving the problem of angle dependence. In the research on solving the angle dependence of photonic crystals, most research teams only produce structural colors with low angle dependence, and do not To realize the function of real-time color change

Method used

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  • A low-angle-dependent real-time color-changing film based on electric field manipulation
  • A low-angle-dependent real-time color-changing film based on electric field manipulation
  • A low-angle-dependent real-time color-changing film based on electric field manipulation

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0038] Due to the complexity of the irregular surface morphology, theoretical calculation and multi-parameter optimization are quite difficult when studying the interaction between light and this irregular surface. Therefore, numerical simulation methods are used to simulate the best parameters for film design. In the simulation process, first design a curve with random fluctuations, and then generate a rough film. The degree of fluctuation of this curve is controllable. By changing the parameters, different degrees of fluctuation can be obtained, that is, the roughness of the film can be simulated. In this simulation, when the roughness parameter N is 30, b is 5, and the film thickness is 122nm, the position of the reflection peak can move within 30 degrees, and the position of the reflection peak can move less than 10nm. When observed in a small angle range, the color is almost no change. Achieve stealth effect.

[0039] Such as figure 2 As shown, prepare the BST target m...

Embodiment 3

[0044] Continue to optimize the roughness of the BST film. When N=20, b=1.4, the film thickness is 121nm, but at this time the required refractive index changes, so the components of strontium and barium should be adjusted to achieve the required refractive index. It can be achieved that within 30 degrees, the position of the reflection peak moves less than 10nm, and when observed in a small angle range, the color hardly changes. Achieve stealth effect.

[0045] Such as figure 2 As shown, prepare the BST target material with the desired composition of strontium and barium, and adjust the composition of strontium and barium so that the initial refractive index of the BST material is 2.5 when no electric field is applied. The silicon substrate is roughened to form uneven and irregular surface micro-nano structures. A layer of transparent electrode is grown on the roughened silicon substrate, and the transparent electrode continues to use indium tin oxide (ITO) material, and i...

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Abstract

The invention relates to a low-angle-dependent color-changing film controlled by an electric field, which belongs to the field of color-changing materials. The present invention mainly realizes discoloration by changing the dielectric constant (refractive index), and realizes multiple diffraction and scattering through uneven and irregular surfaces, so that the light reflected by the film has low angle dependence, so that it can not only change color in real time but also Can greatly reduce the angular dependence of color. When the viewing angle is from 0° to 30°, the reflection peak moves within 10nm, and the color reflected by the film hardly changes; and it can change color in real time; the invention can be used in stealth because the detection is long-distance, that is, the target and the detection The equipment has a considerable distance, and the detection equipment has a small field of view in this case, that is, the detection is also the detection of a small angle range. If an angle-independent color is achieved within a small angle range (0° to 30°), camouflage and stealth can be achieved.

Description

technical field [0001] The invention relates to a low-angle-dependent color-changing film controlled by an electric field, which belongs to the field of color-changing materials. Background technique [0002] Due to the application requirements of color-changing materials in military and civilian aspects, color-changing technology has become a hot topic in current scientific research. Scientists divide the color types in nature into two categories, one is chemical color and the other is structural color. Chemical colors use chemical colorants and pigments to achieve coloring purposes. This method may cause problems such as resource destruction and environmental pollution. Compared with pigmented colors, structural colors have the advantages of corrosion resistance, no environmental pollution and never fade. Structural colors are structurally sensitive. Structural sensitivity means that it will show different colors for different structural parameters and material paramet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1514G02F1/153G02F1/15
CPCG02F1/15G02F1/1533G02F1/1514
Inventor 张金英王瑞李卓王欣杨苏辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY