Wide-temperature-range low-energy-consumption multistable photonic crystal film as well as preparation method and application thereof

Abstract

The invention relates to the technical field of photonic crystal materials, in particular to a wide-temperature-range low-energy-consumption multistable photonic crystal film and a preparation method and application thereof.The photonic crystal film is composed of a physical crosslinking type hydrogel matrix and magnetic response type photonic crystals fixed in the physical crosslinking type hydrogel matrix, the photonic crystal film has magnetic field adjustability of colors in a sol state above a phase change point of the hydrogel, and magnetic assembly colors in the sol state can be recorded and developed in a gel state at the temperature of the phase change point. According to the wide-temperature-range low-energy-consumption multistable photonic crystal film, the element for regulating and controlling the optical property is the magnetic photonic crystal, the color is changed based on magnetic field response, compared with other external fields such as light, electricity and chemical stimulation, the magnetic field has the properties of non-contact, controllability and the like, and adjustment is easy and convenient. The photonic crystal film is rich in color change variety, energy loss only occurs in the color regulation and control stage, color stable display does not need external field assistance, and therefore the photonic crystal film is a low-energy-consumption multistable photonic crystal film.

Description

Technical Field

[0001] The present invention relates to the technical field of photonic crystal materials, and in particular to a multi-stable photonic crystal film with a wide temperature range and low energy consumption, and a preparation method and application thereof. Background Art

[0002] Responsive photonic crystals are ordered structural materials that can respond to external stimuli such as electric field, magnetic field, temperature, pressure / tension, humidity, pH, biological groups, etc. As the intensity of external stimuli changes, the diffraction spectrum and structural color of responsive photonic crystals change accordingly, which makes them have broad application prospects in many fields such as display, sensing, anti-counterfeiting, and decoration. Most of the responsive photonic crystal materials reported so far are based on responsive chemical cross-linked hydrogels, which have the characteristics of sensitive response to external field stimuli, wide color change range, and good reversibility. However, continuous application of external field stimulation is required to maintain a specific structural color, which not only leads to the complexity of the structure of its application device but also generates a large amount of energy loss, limiting its application in outdoor advertising, camouflage and other fields with multi-stable display characteristics. Summary of the invention

[0003] One of the purposes of the present invention is to provide a multi-stable photonic crystal film with a wide temperature range and low energy consumption, which can solve the problem that the current responsive photonic crystal film needs external field assistance to stably display specific colors and the common hydrogel photonic crystal film has poor freezing resistance due to its high freezing point.

[0004] The second object of the present invention is to provide a method for preparing a multi-stable photonic crystal film with a wide temperature range and low energy consumption. The preparation method is simple and easy to control.

[0005] The third object of the present invention is to provide a multi-stable photonic crystal screen with a wide temperature range and low energy consumption.

[0006] A fourth object of the present invention is to provide an application of a multi-stable photonic crystal film with a wide temperature range and low energy consumption.

[0007] The solution adopted by the present invention to achieve one of the purposes is: a wide temperature range, low energy consumption, multi-stable photonic crystal film, which is composed of a physically cross-linked hydrogel matrix and a magnetically responsive photonic crystal fixed therein. The photonic crystal film has magnetic field adjustability of color in a sol state above the hydrogel phase transition point, and the gel state at the phase transition point temperature can record the magnetic assembly color in the sol state and display the color, and has multiple stable display states with different colors.

[0008] Preferably, the physically cross-linked hydrogel is obtained by polymerizing gelatin or agarose in a mixture of water and an organic solvent, and the organic solvent has a low freezing point and is a good dispersion liquid for magnetically responsive photonic crystals.

[0009] Preferably, the volume percentage of the organic solvent in the mixed solution is 30%-70%, and the concentration of gelatin or agar in the mixed solution is 2-30 mg / mL.

[0010] Preferably, the organic solvent includes at least one of dimethyl sulfoxide, ethylene glycol and dimethylformamide.

[0011] Preferably, the crystal assembly unit of the magnetically responsive photonic crystal is Fe3O4@PVP colloidal nanoparticles, the particle size is 120-300 nm, and the concentration of the particles in the gel matrix is ​​2-10 mg / mL.

[0012] Preferably, the wide temperature range is -20°C-40°C. The wide temperature range low energy consumption multi-stable photonic crystal film can stably display colors in a wide temperature range of -20°C-40°C without external field assistance.

[0013] Unlike chemically cross-linked hydrogels, physically cross-linked hydrogels have a reversible sol-gel phase transition, and the phase transition temperature is usually much higher than room temperature. In the present invention, a physically cross-linked hydrogel is used as a matrix, and a magnetically responsive photonic crystal is fixed therein. When the physically cross-linked hydrogel is composited with the magnetically responsive photonic crystal, the magnetic tunability of the color of the magnetically responsive photonic crystal can be retained in the sol state, and the color can be adjusted as needed; in the gel state, the photonic crystal structure is locked by the physical cross-linked network, so that the photonic band gap can be kept fixed and its structural color can be stably displayed without the need for a magnetic field. The composite material based on physically cross-linked hydrogel and magnetic photonic crystal of the present invention can exhibit low energy consumption and multi-stable display characteristics in a wide temperature range.

[0014] The wide temperature range, low energy consumption, multi-stable photonic crystal film of the present invention has multi-optical stable state properties, which is manifested in that in the gel state, the color of the photonic crystal film does not change with external stimuli such as magnetic fields, and the color switching in the sol state can be fixed with the change of the gel, thereby realizing multi-optical stable state display.

[0015] Furthermore, the phase transition temperature of the hydrogel can be controlled by regulating the type and concentration of different natural polymers and the type and content of organic solvents, thereby regulating the temperature range for stable color development of the photonic crystal film.

[0016] The intrinsic color of the photonic crystal film can be controlled by adjusting the content of superparamagnetic Fe3O4@PVP colloidal nanoparticles, and the color can be controlled by adjusting the spacing of superparamagnetic Fe3O4@PVP colloidal nanoparticles in the sol state by changing the magnetic field strength.

[0017] The second object of the present invention is to provide a method for preparing the wide temperature range low energy consumption multi-stable photonic crystal film, comprising the following steps:

[0018] (1) preparing a sol of a physically cross-linked hydrogel matrix;

[0019] (2) adding a magnetically responsive photonic crystal raw material to the sol of step (1) and mixing them uniformly to obtain a photonic crystal sol;

[0020] (3) The photonic crystal sol of step (2) is placed in a magnetic field of a certain intensity to produce a certain color, the magnetic field intensity is kept unchanged until it cools to form a film, and the magnetic field is removed to obtain a multi-stable photonic crystal film with a wide temperature range and low energy consumption.

[0021] Preferably, the magnetic field strength ranges from 0 to 700 Gs.

[0022] By repeating the operation of step (3) and changing the magnetic field strength, a multi-stable photonic crystal film with a wide temperature range and low energy consumption and different color rendering can be obtained.

[0023] In the preparation method of the present invention, a physically cross-linked hydrogel in a sol state is first prepared; Fe3O4@PVP colloidal nanoparticles are added to the sol and mixed evenly to obtain a photonic crystal sol, wherein there is a physical bond between the Fe3O4@PVP colloidal nanoparticles and the hydrogel matrix; a magnetic field is applied to produce the desired color, and the magnetic field strength is maintained unchanged until it is cooled to form a gel film. When the magnetic field is removed, the gel film exhibits the magnetic assembly color in the sol state, and the color remains stable in a wide temperature range of -20°C to 40°C. When only the magnetic field strength in the sol state is changed, the color of the photonic crystal gel film changes accordingly, thereby obtaining a wide temperature range, low energy consumption, and multi-stable photonic crystal film.

[0024] The third object of the present invention is to provide a wide temperature range, low energy consumption, multi-stable photonic crystal screen, and encapsulate the wide temperature range, low energy consumption, multi-stable photonic crystal film in a non-magnetic transparent cavity to achieve the magnetic field adjustability of the color of the wide temperature range, low energy consumption, multi-stable photonic crystal screen in the sol state above the hydrogel phase transition point, and the gel state can record the magnetic assembly color in the sol state and display the color at the phase transition point temperature.

[0025] The specific preparation method comprises the following steps: A1, preparing a sol of a physically cross-linked hydrogel matrix;

[0026] A2, adding magnetically responsive photonic crystal raw materials to the sol in step A1 and mixing them evenly to obtain photonic crystal sol;

[0027] A3, injecting the photonic crystal sol of step A2 into a non-magnetic transparent cavity and sealing it; generating a certain color in a magnetic field of a certain intensity, maintaining the magnetic field intensity unchanged until the sol cools and forms a film, and removing the magnetic field to obtain a wide temperature range, low energy consumption, multi-stable photonic crystal screen.

[0028] Repeating the operation of step A3 and changing the magnetic field strength can obtain a multi-stable photonic crystal screen with a wide temperature range and low energy consumption and different color rendering.

[0029] A fourth object of the present invention is to provide an application of the wide temperature range, low energy consumption, multi-stable photonic crystal film, and to apply the wide temperature range, low energy consumption, multi-stable photonic crystal film to the fields of outdoor display, sensing, and camouflage.

[0030] The present invention has the following advantages and beneficial effects:

[0031] The wide temperature range, low energy consumption, multi-stable photonic crystal film of the present invention has a magnetic photonic crystal as the basic unit for regulating optical properties. The color changes based on the magnetic field response. Compared with other external fields, such as light, electricity, and chemical stimulation, the magnetic field has the properties of being contactless and controllable, and is relatively simple and convenient to adjust.

[0032] The wide temperature range, low energy consumption, multi-stable photonic crystal film of the present invention is different from the existing multi-stable color-changing materials. The wide temperature range, low energy consumption, multi-stable photonic crystal film of the present invention has a rich variety of color changes, and energy loss only occurs in the color regulation stage. The color stable display does not require external field assistance. Therefore, it is a low-energy consumption multi-stable photonic crystal film.

[0033] The wide temperature range, low energy consumption, multi-stable photonic crystal film of the present invention can stably display colors in a wide temperature range of -20°C to 40°C without external field assistance.

[0034] The preparation method of the invention is simple, easy to control and suitable for batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The reflectance spectrum curve (a) of the multistable photonic crystal film in the sol state as it changes with the magnetic field in Example 1, wherein the inset is a digital photo of the sol state, and the temperature-varying rheological curve of the multistable photonic crystal film (b);

[0036] Figure 2 The digital photographic images of the multistable photonic crystal film in Example 1 after being subjected to magnetic fields of different strengths for a certain period of time and then having the magnetic field removed;

[0037] Figure 3 The reflectance spectrum contour map (a) of the multi-stable photonic crystal film during the cyclic color change process in Example 1 and the magnetic field and temperature changes during the corresponding process (b);

[0038] Figure 4 The scanning electron microscope image (a) of the multi-stable photonic crystal film in Example 1 and the change of the reflection peak position under different magnetic fields in the gel state (b), wherein the built-in illustrations are digital photos under the corresponding magnetic fields;

[0039] Figure 5 is a reflection spectrum curve of the multistable photonic crystal film in Example 2 in the sol state as the magnetic field changes;

[0040] Figure 6 This is the reflection spectrum curve of the multistable photonic crystal film in Example 3 in the sol state as the magnetic field changes. DETAILED DESCRIPTION

[0041] For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

[0042] Example 1

[0043] A method for preparing a multi-stable photonic crystal film with a wide temperature range and low energy consumption comprises the following steps:

[0044] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 150 nm) were dispersed in a sol composed of agarose, dimethyl sulfoxide (DMSO) and water, where the concentration of agarose was 30 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of DMSO to water was 1:1.

[0045] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 700 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0046] (3) The magnetic field strength in (2) is adjusted, and the multistable photonic crystal film shows different structural colors in the gel state. When the magnetic field strength decreases from 700 Gs to 110 Gs, the diffraction wavelength of the photonic crystal film gradually redshifts from 550nm to 601nm. If the magnetic field is further reduced, the intrinsic color of the particle is displayed.

[0047] Figure 1 : This is the reflection spectrum curve (a) of the multistable photonic crystal film in Example 1 in the sol state as the magnetic field changes, wherein the built-in illustration is a digital photo of the sol state, and the temperature-varying rheological curve (b) of the multistable photonic crystal film; from Figure (a), it can be seen that the multistable photonic crystal film has a color change range from orange-red to yellow-green, and the corresponding magnetic field intensity increases from 0Gs to 700Gs during the change of the reflection peak position from right to left. From Figure (b), it can be seen that the sol temperature point of the multistable photonic crystal film is 67°C, and the gel temperature point is 40°C.

[0048] Figure 2 These are digital photographs of the multistable photonic crystal film in Example 1 after being subjected to magnetic fields of different strengths for a certain period of time and then having the magnetic field removed; it can be seen from the figure that as the magnetic field strength increases, the time required to achieve stable color display becomes shorter.

[0049] Figure 3(a) is a contour diagram of the reflection spectrum of the multistable photonic crystal film in the cyclic color change process in Example 1, and (b) is a corresponding change in the magnetic field and temperature in the process; it can be seen from the figure that the reflection spectrum remains almost unchanged until the temperature reaches 67°C, and when the temperature drops below 40°C, the reflection peak shows a certain blue shift and the reflectivity decreases to a certain extent.

[0050] Figure 4 Figure 1 is a scanning electron microscope image of the multistable photonic crystal film in Example 1 (a) and the change in the reflection peak position of the multistable photonic crystal film in the gel state under different magnetic fields (b). The built-in illustrations are digital photos under the corresponding magnetic fields. It can be seen from the figure that the reflection peak position of the multistable photonic crystal film in the gel state is not affected by the external magnetic field, and is also not affected by the magnetic field when displaying its intrinsic chemical color.

[0051] Example 2

[0052] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0053] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 180 nm) were dispersed in a sol composed of agarose, dimethyl sulfoxide (DMSO) and water, where the concentration of agarose was 30 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of DMSO to water was 1:1.

[0054] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 700 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0055] (3) The magnetic field strength in (2) is adjusted, and the multistable photonic crystal film shows different structural colors in the gel state. When the magnetic field strength decreases from 700 Gs to 110 Gs, the diffraction wavelength of the photonic crystal film gradually redshifts from 660 nm to 700 nm. If the magnetic field is further reduced, the intrinsic color of the particle is displayed.

[0056] Figure 5 This is a reflection spectrum curve of the multistable photonic crystal film in the sol state in Example 2 as the magnetic field changes. When the reflection peak position changes from right to left, the corresponding magnetic field intensity increases from 0 Gs to 700 Gs.

[0057] Example 3

[0058] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0059] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 120 nm) were dispersed in a sol composed of agarose, dimethyl sulfoxide (DMSO) and water, where the concentration of agarose was 30 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of DMSO to water was 1:1.

[0060] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 700 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0061] (3) The magnetic field strength in (2) is adjusted, and the multistable photonic crystal film shows different structural colors in the gel state. When the magnetic field strength decreases from 700 Gs to 110 Gs, the diffraction wavelength of the photonic crystal film gradually redshifts from 448 nm to 480 nm. If the magnetic field is further reduced, the intrinsic color of the particle is displayed.

[0062] Figure 6 This is a reflection spectrum curve of the multistable photonic crystal film in the sol state in Example 3 as the magnetic field changes. When the reflection peak position changes from right to left, the corresponding magnetic field intensity increases from 0 Gs to 700 Gs.

[0063] Example 4

[0064] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0065] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 150 nm) were dispersed in a sol composed of agarose, dimethylformamide and water, wherein the concentration of agarose was 30 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of DMSO to water was 1:1.

[0066] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 700 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0067] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0068] Example 5

[0069] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0070] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 150 nm) were dispersed in a sol composed of agarose, ethylene glycol and water, wherein the concentration of agarose was 5 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of ethylene glycol to water was 1:1.

[0071] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 700 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0072] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0073] Example 6

[0074] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0075] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 150 nm) were dispersed in a sol composed of gelatin, dimethyl sulfoxide and water, wherein the gelatin concentration was 20 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of dimethyl sulfoxide to water was 3:7.

[0076] (2) After preheating the glass substrate, the sol is coated on it and placed in a magnetic field of 400 Gs for 2 minutes. After cooling to room temperature, it shows bright structural colors.

[0077] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0078] Example 7

[0079] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0080] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 150 nm) were dispersed in a sol composed of agarose, gelatin, dimethyl sulfoxide and water, wherein the concentration of agarose was 5 mg / mL, the concentration of gelatin was 15 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 8 mg / mL, and the volume ratio of dimethyl sulfoxide to water was 1:1.

[0081] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 500 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0082] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0083] Example 8

[0084] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0085] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 120 nm) were dispersed in a sol composed of gelatin, dimethyl sulfoxide and water, wherein the gelatin concentration was 2 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 2 mg / mL, and the volume ratio of dimethyl sulfoxide to water was 7:3.

[0086] (2) After preheating the glass substrate, the sol is coated on it and placed in a magnetic field of 100 Gs for 2 minutes. After cooling to room temperature, it shows bright structural colors.

[0087] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0088] Example 9

[0089] A multi-stable photonic crystal film prepared based on magnetic colloidal nanoparticles comprises the following steps:

[0090] (1) Superparamagnetic Fe3O4@PVP colloidal nanoparticles (particle size of 300 nm) were dispersed in a sol composed of agarose, gelatin, dimethyl sulfoxide and water, wherein the concentration of agarose was 15 mg / mL, the concentration of gelatin was 10 mg / mL, the concentration of superparamagnetic Fe3O4@PVP colloidal nanoparticles was 10 mg / mL, and the volume ratio of dimethyl sulfoxide to water was 6:4.

[0091] (2) After preheating the glass substrate, the sol was coated on it and placed in a magnetic field of 600 Gs for 2 minutes. After cooling to room temperature, it showed bright structural colors.

[0092] (3) By adjusting the magnetic field strength in (2), the multistable photonic crystal film shows different structural colors in the gel state, and further reducing the magnetic field will show the intrinsic color of the particles.

[0093] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A multi-stable photonic crystal film with a wide temperature range and low energy consumption, characterized in that: The photonic crystal film is composed of a physically cross-linked hydrogel matrix and magnetically responsive photonic crystals fixed therein. The photonic crystal film has magnetic field adjustability of color in a sol state above the hydrogel phase transition point, and the gel state at the phase transition point temperature can record and display the magnetic assembly color in the sol state.

2. The wide temperature range low energy consumption multi-stable photonic crystal film according to claim 1, characterized in that: The physically cross-linked hydrogel is obtained by polymerizing gelatin or agarose added to a mixed solution of water and an organic solvent, wherein the organic solvent has a low solidification point and is a good dispersion liquid for magnetically responsive photonic crystals.

3. The wide temperature range low energy consumption multi-stable photonic crystal film according to claim 2, characterized in that: The volume percentage of the organic solvent in the mixed solution is 30%-70%, and the concentration of gelatin or agar in the mixed solution is 2-30 mg / mL.

4. The wide temperature range low energy consumption multistable photonic crystal film according to claim 2, characterized in that: The organic solvent includes at least one of dimethyl sulfoxide, ethylene glycol and dimethylformamide.

5. The wide temperature range low energy consumption multistable photonic crystal film according to claim 1, characterized in that: The crystal assembly unit of the magnetic responsive photonic crystal is Fe3O4@PVP colloidal nanoparticles, the particle size is 120-300nm, and the concentration of the particles in the gel matrix is ​​2-10mg / mL.

6. The wide temperature range low energy consumption multistable photonic crystal film according to claim 1, characterized in that: The wide temperature range is -20°C to 40°C.

7. A method for preparing a wide temperature range, low energy consumption multi-stable photonic crystal film according to any one of claims 1 to 6, characterized in that: The steps include: (1) preparing a sol of a physically cross-linked hydrogel matrix; (2) adding a magnetically responsive photonic crystal raw material to the sol of step (1) and mixing them uniformly to obtain a photonic crystal sol; (3) The photonic crystal sol of step (2) is placed in a magnetic field of a certain intensity to produce a certain color, the magnetic field intensity is kept unchanged until it cools to form a film, and the magnetic field is removed to obtain a multi-stable photonic crystal film with a wide temperature range and low energy consumption.

8. The method for preparing a wide temperature range, low energy consumption multi-stable photonic crystal film according to claim 7, characterized in that: The magnetic field strength ranges from 0 to 700 Gs.

9. A multi-stable photonic crystal screen with a wide temperature range and low energy consumption, characterized in that: The wide temperature range, low energy consumption multistable photonic crystal film described in any one of claims 1 to 6 or the wide temperature range, low energy consumption multistable photonic crystal film prepared by the preparation method described in any one of claims 7 to 8 is encapsulated in a non-magnetic transparent cavity, so that the wide temperature range, low energy consumption multistable photonic crystal screen has magnetic field adjustability of color in the sol state above the hydrogel phase transition point, and the gel state can record the magnetic assembly color in the sol state and display the color at the phase transition point temperature.

10. An application of the wide temperature range low energy consumption multi-stable photonic crystal film according to any one of claims 1 to 6 or the wide temperature range low energy consumption multi-stable photonic crystal film prepared by the preparation method according to any one of claims 7 to 8, characterized in that: The wide temperature range, low energy consumption, multi-stable photonic crystal film is applied to the fields of outdoor display, sensing, and camouflage.

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