CN113442618A - Photonic crystal color printing method and photonic crystal color printed matter - Google Patents

Photonic crystal color printing method and photonic crystal color printed matter Download PDF

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Publication number
CN113442618A
CN113442618A CN202110302927.0A CN202110302927A CN113442618A CN 113442618 A CN113442618 A CN 113442618A CN 202110302927 A CN202110302927 A CN 202110302927A CN 113442618 A CN113442618 A CN 113442618A
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Prior art keywords
photonic crystal
solvent
crystal particles
color
printing solution
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Granted
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CN202110302927.0A
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CN113442618B (en
Inventor
朱显禹
朱显瑞
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Yingkusida Co ltd
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Yingkusida Co ltd
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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
    • B41M3/003—Printing processes to produce particular kinds of printed work, e.g. patterns on optical devices, e.g. lens elements; for the production of optical devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0009—Obliterating the printed matter; Non-destructive removal of the ink pattern, e.g. for repetitive use of the support
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Abstract

The invention relates to a photonic crystal color printing method and a photonic crystal color printed matter. The invention relates to a photonic crystal color printing method, which comprises the following steps: (a) a step of preparing a printing solution including photonic crystal particles whose reflected light changes according to an arrangement form and a solvent in which the photonic crystal particles are dispersed; (b) a step of forming a printing solution on a substrate; (c) a step of adjusting the color of the printing solution by inputting energy to the printing solution; in the step (c), the volume of the solvent is changed according to the input amount of energy, thereby adjusting the arrangement pitch of the photonic crystal particles.

Description

Photonic crystal color printing method and photonic crystal color printed matter
Technical Field
The invention relates to a photonic crystal color printing method and a photonic crystal color printed matter. And more particularly, to a photonic crystal color printing method and a photonic crystal color printed matter in which a plurality of colors can be printed using a solution containing photonic crystal particles and the color of the photonic crystal can be changed according to time, environment, and the like.
Background
A photonic crystal refers to a substance or a crystal that reflects only light of a specific wavelength among incident light and passes light of the remaining wavelengths, thereby exhibiting a color corresponding to the specific wavelength. Representative examples of photonic crystals are the wings of butterflies, shells of beetles, and the like. They contain no pigment but can exhibit a specific color because they contain a specific photonic crystal structure.
Recently, according to studies on photonic crystals, compared to conventional photonic crystals existing in the natural world that reflect only light having a specific wavelength, photonic crystals that include a specific substance and are artificially synthesized can arbitrarily change the crystal structure of the photonic crystals based on various external stimuli, and as a result, the wavelengths of reflected light in the visible light band, and even in the ultraviolet or infrared band can be flexibly adjusted.
In the prior art, a technology for realizing a plurality of colors in a display device by using a magnetic field and an electric field by using the photonic crystal is proposed. The present inventors have focused on the fact that a printing method and a printed matter are realized by utilizing the characteristic of reflecting light of an arbitrary wavelength by controlling the pitch between photonic crystal particles, to realize the present invention.
Disclosure of Invention
Technical problem
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a method for printing a photonic crystal color and a photonic crystal color printed matter, which can realize a plurality of colors by using a solution containing photonic crystal particles.
Further, the present invention is directed to a photonic crystal color printing method and a photonic crystal color printed matter, which can change color depending on time, environment, and the like.
Technical scheme
The above object of the present invention can be achieved by a photonic crystal color printing method comprising: (a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed; (b) a step of forming a printing solution on a substrate; (c) and (c) adjusting the color of the printing solution by inputting energy to the printing solution, wherein the volume of the solvent is changed according to the input amount of the energy, thereby adjusting the arrangement pitch of the photonic crystal particles.
The above object of the present invention can be also achieved by a photonic crystal color printing method including (a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed; (b) a step of forming a printing solution on a substrate; (c) and (c) adjusting a color of the printing solution by inputting energy into the printing solution, wherein at least one of a size of the photonic crystal particle, a refractive index of the photonic crystal particle, and a refractive index of the solvent is changed according to the input amount of the energy, thereby adjusting a characteristic of the photonic crystal reflected light by the photonic crystal particle.
Further, the above object of the present invention can be achieved by a photonic crystal color printing method including (a) a step of preparing a printing solution and a reaction solution, the printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed, the reaction solution reacting with at least one of the photonic crystal particles and the solvent when energy is input; (b) a step of forming a printing solution and a reaction liquid on a substrate; (c) and (c) adjusting the color of the printing solution by inputting energy to the reaction solution, wherein in the step (c), the reaction solution reacts with at least one of the photonic crystal particles and the solvent to change at least one of the size of the photonic crystal particles, the volume of the solvent, the refractive index of the photonic crystal particles, and the refractive index of the solvent.
Further, the above object of the present invention can be achieved by a photonic crystal color printing method including (a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed; (b) a step of forming a printing solution on a substrate; (c) and a step of forming an anti-vaporization film for preventing vaporization of a solvent on the printing solution, the solvent containing a substance vaporized in a use environment, and if the anti-vaporization film is removed, the solvent is vaporized, and an amount of vaporization of the solvent is changed according to at least one of an exposure time in the use environment and external energy, thereby adjusting an arrangement pitch of the photonic crystal particles.
Further, the above object of the present invention can be achieved by a photonic crystal color printing method comprising: (a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed; (b) a step of forming a printing solution on a substrate; (c) and a step of forming an anti-reaction film on the printing solution for preventing a solvent from reacting with the detection object in the use environment, the solvent containing a substance that reacts with the detection object in the use environment, and if the anti-reaction film is removed, the solvent reacting with the detection object in the use environment, thereby adjusting the arrangement pitch of the photonic crystal particles.
The photonic crystal particles may include polystyrene, polymethyl methacrylate (PMMA), SiOx、TiOx、FeOxAt least one of Fe, Ni, Co and Ag.
The photonic crystal particles may have a size of 10nm to 1 μm.
The energy may be at least one of light energy and thermal energy.
At least two energies are input, one of which can be used to cure the solvent.
The surface of the substrate may be formed with a light absorbing film or a black layer.
Before the step (b), a black solution for forming a light absorption film or a black layer is formed on the substrate, and the black solution may be cured and the light absorption film or the black layer may be formed based on the energy input in the step (c).
In the step (b), the printing solution may be formed on the substrate in the form of a QR code, a barcode, an image, a pattern, text, a graphic, or a combination thereof.
In the step (b), the color may be adjusted according to a mixing ratio of the printing solution and the reaction liquid.
Further, the above object of the present invention can be achieved by a photonic crystal color printed matter formed on a substrate by a printing solution comprising: photonic crystal particles that change reflected light according to an arrangement form; and a solvent in which the photonic crystal particles are dispersed, the volume of the solvent being changed according to an input amount of energy, thereby changing the color of reflected light by adjusting the arrangement pitch of the photonic crystal particles.
Further, the above object of the present invention can be achieved by a photonic crystal color printed matter formed on a substrate by a printing solution comprising: photonic crystal particles in which reflected light changes according to an arrangement form; and a solvent in which the photonic crystal particles are dispersed, at least one of a size of the photonic crystal particles, a refractive index of the photonic crystal particles, and a refractive index of the solvent being varied according to an input amount of energy to adjust a characteristic of the photonic crystal reflected light based on the photonic crystal particles.
Further, the above object of the present invention can be achieved by a photonic crystal color printed matter in which a printing solution and a reaction solution are formed on a base material, the printing solution comprising: photonic crystal particles in which reflected light changes according to an arrangement form; and a solvent in which the photonic crystal particles are dispersed, wherein the reaction solution reacts with at least one of the photonic crystal particles and the solvent, and at least one of the size of the photonic crystal particles, the volume of the solvent, the refractive index of the photonic crystal particles, and the refractive index of the solvent is changed to change the color of the printing solution.
Further, the above object of the present invention can be achieved by a photonic crystal color printed matter formed on a substrate by a printing solution, the photonic crystal color printed matter being formed on the substrate by the printing solution, the printing solution comprising: photonic crystal particles in which reflected light changes according to an arrangement form; and a solvent in which photonic crystal particles are dispersed, an anti-vaporization film for preventing vaporization of the solvent being formed on the printing solution, the solvent containing a substance vaporized in a use environment, the solvent being vaporized if the anti-vaporization film is removed, and a vaporization amount of the solvent being varied according to at least one of an exposure time in the use environment and an external energy, thereby changing a color of reflected light by adjusting an arrangement pitch of the photonic crystal particles.
Further, the above object of the present invention can be achieved by a photonic crystal color printed matter formed on a substrate by a printing solution comprising: photonic crystal particles in which reflected light changes according to an arrangement form; and a solvent in which the photonic crystal particles are dispersed, an anti-reaction film for preventing the solvent from reacting with the detection object in the use environment being formed on the printing solution, the solvent containing a substance that reacts with the detection object in the use environment, the solvent reacting with the detection object in the use environment if the anti-reaction film is removed, thereby changing the color of the reflected light by adjusting the arrangement pitch of the photonic crystal particles.
The detection object of the use environment can be pH, UV and O3Any one of them.
Further, the object of the present invention can be achieved by a color change sensor including the photonic crystal color print.
Effects of the invention
According to the present invention as described above, there is an effect that a plurality of colors can be realized by using a solution containing photonic crystal particles. The same photonic crystal solution can be used for printing various colors, so that the method can be applied to color printers, anti-counterfeiting patterns and the like.
Further, according to the present invention, there is an effect that the color can be changed according to time or environment, etc. Thereby, the color can be changed by the external exposure environment, so that the distribution period/valid period or the maturity/decay degree of the product can be visually identified.
Drawings
Fig. 1 is a schematic diagram exemplarily showing adjustment of a wavelength of light reflected by a solution containing photonic crystal particles according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a first embodiment of the present invention.
FIG. 3 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a second embodiment of the present invention.
FIG. 4 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a third embodiment of the present invention.
Fig. 5 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a fourth embodiment of the present invention.
Fig. 6 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a fifth embodiment of the present invention.
Reference numerals:
10. 110, 210, 310, 410, 510: photonic crystal particle
20. 120, 220, 320, 420, 520: solvent(s)
330: reaction solution
50: injection mechanism
60. 70: base material
80: gasification-proof film and anti-reaction film
Detailed Description
The following detailed description of the invention refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. These embodiments are described in detail below in order to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention, although different, are not mutually exclusive. For example, particular shapes, structures and features of one embodiment described herein may be implemented with other embodiments without departing from the spirit and scope of the invention. In addition, the location or arrangement of individual components within each disclosed embodiment may be modified without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims, along with the full scope of equivalents to which such claims are entitled. Like reference numerals in the drawings denote the same or similar functions in various aspects, and the length and area, thickness, etc., and the shape thereof may be enlarged for convenience of description.
The singular expressions "a", "an" and "the" in the present specification include plural expressions unless a specific interpretation thereof is made. The terms "comprises/comprising" or "having" and the like as used in the specification are used to indicate the presence of stated features, integers, steps, operations, elements, components or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components or groups thereof.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the present invention.
Fig. 1 is a schematic diagram exemplarily showing adjustment of a wavelength of light reflected by a solution containing photonic crystal particles according to an embodiment of the present invention.
As shown in fig. 1, the photonic crystal particles 10 dispersed in the solvent 20 with uniform size may exhibit a specific color by Self-alignment (Self-alignment) or alignment via external magnetic/electric/optical/chemical energy, etc. Each particle 10 can adjust the relative strength of the attractive force and repulsive force between the particles based on the inherent magnetic/electrical/optical/chemical characteristics of the material constituting the particle, the electrical/magnetic/optical/chemical characteristics of the substance coated on the surface of the particle, the magnetic/electrical/optical/chemical characteristics of the medium in which the particle is dispersed, the electric energy/magnetic energy/optical energy/chemical energy input from the outside, and the like, thereby determining the distance between the particles. Thus, the particles 10 arranged while maintaining a certain pitch may perform the function of a photonic crystal reflecting a certain reflected light. That is, the wavelength of the light reflected by the particles 10 is determined based on the pitch between the particles 10 according to Bragg's law, and thus the wavelength of the light reflected by the particles 10 can be adjusted by controlling the pitch between the particles 10.
Here, the wavelength pattern of the reflected light may take various forms based on factors such as the size and form of the particles, the interval between the particles, the refractive indices of the particles and the solvent, and the concentration of the particles dispersed in the solvent.
Referring to fig. 1 (a), initially, the photonic crystal particles 10 dispersed in the solvent 20 may be irregularly arranged, in which case the particles 10 do not exhibit a specific color. Then, referring to fig. 1 (b), photonic crystal particles 10 may be Self-aligned based on inherent characteristics, or attractive and repulsive forces between particles 10 may be balanced and uniformly aligned in a form of maintaining a specific interval based on specific energy inputted from the outside. Thereby, the plurality of particles 10 whose pitch is controlled reflect light of a specific wavelength. Referring to fig. 1 (c) and 1 (d), if the energy inputted from the outside is changed so that the attractive force between the particles exerts a stronger action, the pitch between the particles 10 becomes narrower, and thus the wavelength of the reflected light of the particles 10 becomes shorter. That is, according to an embodiment of the present invention, the wavelength of light reflected by the particle 10 may be adjusted by adjusting the inherent magnetic/electrical characteristics of the particle 10 and the intensity of externally inputted magnetic/electrical energy. For application to printed matter, sensors, and the like, the wavelength of light reflected by such a photonic crystal is preferably about 360nm to 760nm, i.e., the visible light band. But not limited thereto, the interval between the particles 10 may be adjusted according to the application wavelength band to reflect the wavelength of the infrared band or the ultraviolet band.
Fig. 2 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a first embodiment of the present invention.
According to a first embodiment of the present invention, a photonic crystal color printing method is characterized by including: (a) a step of preparing a printing solution including photonic crystal particles 110 that change reflected light according to an arrangement form and a solvent 120 in which the photonic crystal particles 110 are dispersed; (b) a step of forming a printing solution on the substrate 60; (c) a step of adjusting a color L1- > L2 of the printing solution by inputting energy E to the printing solution; in step (c), the volume of the solvent 120 is changed by 120- >120' according to the input amount of energy, thereby adjusting the arrangement pitch of the photonic crystal particles 110.
First, referring to fig. 2 (a), a printing solution may be prepared by dispersing photonic crystal particles 110 in a solvent 120.
The photonic crystal particles 110 are uniform in size and may preferably be 10nm to 1 μm in size. The photonic crystal particle 110 preferably contains polystyrene, polymethyl methacrylate (PMMA), SiOx、TiOx、FeOxAt least one of Fe, Ni, Co and Ag, but not limited thereto,the photonic crystal particles 110 of the present invention can be used as long as they have the characteristics of the photonic crystal shown in fig. 1.
The solvent 120 may be composed of a substance having a similar specific gravity to the photonic crystal particles 110 to uniformly disperse the photonic crystal particles 110, and may also be composed of a substance suitable for stable dispersion of the particles 110 in the solvent 120. For example, halocarbon oil, dimethylsilicone oil, or the like having a low dielectric constant may be included.
The solvent 120 is preferably a medium that is solidified based on external energy and changes in volume according to the input amount of the external energy. For example, the solvent 120 may include a curing material that is cured by input of external energy E such as light energy and thermal energy. Further, the solvent 120 may contain a substance that changes in shrinkage [ or changes in volume ] according to the input amount of energy E, which depends on the input time, intensity, and the like.
In addition, according to an embodiment of the present invention, the photonic crystal particles 110 and the solvent 120 may reflect light of a specific wavelength, i.e., have a specific color. More specifically, the photonic crystal particles 110 and the solvent 120 of the present invention may contain a substance having an inorganic pigment, a dye, or the like. Thus, a plurality of color combinations based on self-arrangement can be performed on the basis of the inherent color.
Then, referring to fig. 2(b), a printing solution may be formed on the base material 60.
The printing solution may be formed on the substrate 60 by the spray mechanism 50. The ejection mechanism 50 may be a mechanism for forming the printing solution on the entire surface of the substrate 60, or may be a mechanism for forming the printing solution only on a specific position or a specific region of the substrate 60. For example, the ejection mechanism 50 may be a micro nozzle, preferably a micro nozzle of a piezoelectric (piezo) inkjet printing apparatus, but is not particularly limited thereto, and any printing apparatus, spraying apparatus, or the like may be used as long as it can form a printing solution on the substrate 60.
The substrate 60 may be a carrier for supporting the printing solution and for printing. The base material 60 may be made of a hard material or a flexible material, and may be made of a transparent material, a translucent material, or an opaque material. The surface of the substrate 60 may be flat or may have a shape having a specific curvature or unevenness, but for convenience of description, the description will be made assuming that the shape of the substrate 60 is flat.
The base material 60 may have various forms as long as it can support a printing solution (printing material) and is attached to a product or is incorporated in a product. For example, the sheet-like member may be in the form of a plate, a card, a film, a label, a patch, a textile, or the like. Further, a light absorbing film (not shown) or a black layer (not shown) may be formed on the surface of the substrate 60. The substrate 60 itself may be a light-absorbing film or a black layer. Alternatively, the light absorbing film and the black layer may be formed by ejecting a black solution for forming the light absorbing film and the black layer independently of the printing solution by using another ejection mechanism. Before forming the printing solution on the substrate 60, the light absorption film and the black layer may be formed in advance, and may be cured together when energy E is input to the printing solution. This can further improve the characteristics of the color to be displayed by overlapping or canceling the wavelength reflected by the photonic crystal particle 110.
The printing solution may be formed by patterning on the substrate 60. For example, the printing solution may have a QR code, a barcode, an image, a pattern, text, a graphic, or a combination thereof, and may be formed on the substrate 60. Thereby, the final printed matter can present the specific information to the user more efficiently.
If the printing solution is sprayed onto the substrate 60, the photonic crystal particles 110 of the printing solution will adjust the balance of attractive and repulsive forces to each other to achieve self-alignment (self-alignment). The photonic crystal particles 110 arranged at a predetermined interval in the solvent 120 may reflect a specific wavelength L1[ a specific color ].
Then, referring to fig. 2 (c), the color L1- > L2 of the printing solution can be adjusted by inputting energy E to the printing solution. The method of inputting the energy E to the printing solution includes not only inputting the energy after printing the printing solution on the substrate 60 but also inputting the energy during printing the printing solution on the substrate 60.
The energy E may be light energy, thermal energy, or the like. The method of inputting the energy E includes, in addition to direct input, a method of inputting energy after the substrate 60 on which the printing solution is formed is placed in a specific environment [ for example, an external environment exposed to high temperature, sunlight, ultraviolet rays, or the like ].
In one embodiment of the present invention, Ultraviolet (UV) rays can be used as the energy input, and a UV curing solvent can be used for the solution, but the present invention is not limited to light energy, and heat energy, chemical energy, electric energy, magnetic energy, etc. can be used.
With the input of energy E, the volume changes 120- >120' while the solvent 120 is solidified [ or the shrinkage rate changes ]. It should be noted that (c) of fig. 2 illustrates the case where the solvent 120 contracts, but this is not meant to exclude the case where the solvent expands. As the solvent 120 shrinks and solidifies, the spacing between the photonic crystal particles 110 narrows, and the reflected wavelength changes L1- > L2. Thereby, the printing color can be changed.
While the solvent 120 may cure based on external energy E, it may also cure itself in the use environment. The energy used to cure the solvent 120 may be different from the energy input to change the light characteristics. For example, the light energy for the solvent 120 and the light energy for changing the light characteristics may be light energy of different wavelengths, respectively, or heat energy may be used when the solvent 120 is cured and light energy may be used when the light characteristics are changed.
The reflection wavelength of the photonic crystal can be adjusted according to the intensity and time of the input energy E. When the external energy is light energy, the input amount of the energy can be adjusted by light intensity, light wavelength, light irradiation time, and the like. As an example, for a printing solution that exhibits a specific color L1 when a specific energy E1 is input within a specific time t1, if an energy E2 having an intensity greater than or equal to that of a specific energy E1 is input during a time t2 greater than the specific time t1, the solvent 120 is further shrunk, with the result that the spacing between the photonic crystal particles 110 is further shrunk, thereby becoming a wavelength L2 having a shorter wavelength. If the energy E2 of the intensity less than or equal to the specific energy E1 is inputted during the time t2 less than the specific time t1, the solvent 120 shrinks relatively less and, as a result, the pitch between the photonic crystal particles 110 shrinks relatively less, thereby becoming the wavelength L2 having a longer wavelength.
As described above, if the input amount of external energy is adjusted, the shrinkage rate of the cured and shrunk solvent 120 can be adjusted while changing the color based on the change in the pitch of the photonic crystal particles 110, and thus, fixed printing can be performed. To print a plurality of colors, different energies E may be inputted according to different regions. For example, on the substrate 60, area one may print red, area two may print yellow, area three may print green, area four may print blue, and area five may print violet. Thus, the present invention can have an effect of realizing various colors by using one printing solution and only by adjusting the input amount of the energy E.
FIG. 3 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a second embodiment of the present invention.
According to a second embodiment of the present invention, a photonic crystal color printing method is characterized by including: (a) a step of preparing a printing solution including photonic crystal particles 210 that change reflected light according to an arrangement form and a solvent 220 in which the photonic crystal particles 210 are dispersed; (b) a step of forming a printing solution on the substrate 60; (c) a step of adjusting a color L1- > L3 of the printing solution by inputting energy E to the printing solution; in step (c), at least one of the size of the photonic crystal particle 210, the refractive index of the photonic crystal particle 210, and the refractive index of the solvent 220 is changed by 210- >210' according to the input amount of energy to adjust the characteristics of the photonic crystal reflected light.
First, referring to fig. 3 (a), a printing solution may be prepared by dispersing photonic crystal particles 210 in a solvent 120. Then, referring to fig. 3(b), a printing solution may be formed on the substrate 60. Fig. 3 (a) and 3(b) are the same as fig. 2 (a) and 2(b), and thus a detailed description thereof is omitted.
However, in the second embodiment, the photonic crystal particles 210 may be a substance whose size and refractive index are changed based on the external energy E, and the solvent 220 may be a substance whose refractive index is changed and is curable based on the external energy E. Of course, the photonic crystal particles 110 and the solvent 120 of the first embodiment may be used in combination with the photonic crystal particles 210 and the solvent 220 of the second embodiment. Fig. 3 illustrates and illustrates an example of a change in the size of photonic crystal particle 210.
Then, referring to fig. 3 (c), the color L1- > L3 of the printing solution can be adjusted by inputting energy E to the printing solution.
With the input of energy E, the solvent 220 is cured while the photonic crystal particles 210 change their size 210- > 210'. It should be noted that although fig. 3 (c) illustrates a case where the size of the photonic crystal particle 210 is reduced, this is not meant to exclude a case where the size is increased. If the solvent 220 is cured and the size of the photonic crystal particles 210 becomes smaller, the spacing between the photonic crystal particles 210 becomes relatively larger and the reflected wavelength changes by L1- > L3. Thereby, the printing color can be changed.
The reflection wavelength of the photonic crystal can be adjusted according to the intensity and time of the input energy E. For example, if a weak intensity and a short time of energy E is inputted to a printing solution exhibiting blue color L1, the size of photonic crystal particles 210 becomes small and the wavelength of reflected light becomes slightly longer, so that the color can be changed from blue color L1 to yellow color L3. In contrast, if a stronger intensity, longer time energy E is input, the size of the photonic crystal particle 210 becomes significantly smaller and the wavelength of reflected light becomes significantly longer, so that it can be changed from blue L1 to red L3.
As described above, if the input amount of external energy is adjusted, the solvent 220 is cured while the pitch is changed according to the change in the size of the photonic crystal particles 210 to change the color, and thus, the fixed printing can be performed. Thus, the present invention can have an effect of realizing various colors by using one printing solution and only by adjusting the input amount of the energy E.
FIG. 4 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a third embodiment of the present invention.
According to a third embodiment of the present invention, a photonic crystal color printing method is characterized by including: (a) a step of preparing a printing solution including photonic crystal particles 310 that change reflected light according to an arrangement form and a solvent 320 in which the photonic crystal particles 310 are dispersed, and a reaction solution 330, the reaction solution 330 reacting with at least one of the photonic crystal particles 310 and the solvent 320 when energy is input; (b) a step of forming a printing solution and a reaction liquid on the substrate 60; (c) a step of adjusting the printing solution color L1- > L4 by inputting energy E to the reaction liquid; in step (c), the reaction solution 330 reacts with at least one of the photonic crystal particles 310 and the solvent 320, and at least one of the size of the photonic crystal particles 310, the volume of the solvent 320, the refractive index of the photonic crystal particles 310, and the refractive index of the solvent 320 is changed to adjust the color of the printing solution.
First, referring to fig. 4 (a), a printing solution may be prepared by dispersing photonic crystal particles 310 in a solvent 320. In addition, a reaction liquid 330 that reacts with at least one of the photonic crystal particles 310 of the printing solution and the solvent 320 when energy is input may be prepared. The reaction liquid 330 may change the optical properties on the substrate 60 by reacting 340 with the photonic crystal particles 310 of the printing solution and the solvent 320.
Then, referring to fig. 4(b), a printing solution and a reaction liquid 330 may be formed on the substrate 60. Fig. 4(b) is the same as the process of fig. 2(b), and thus a detailed description thereof is omitted. In the third embodiment, the photonic crystal particles 110 and the solvent 120 of the first embodiment may also be used in combination with the photonic crystal particles 210 and the solvent 220 of the second embodiment.
The reaction liquid 330 may be formed on the substrate 60 by the same ejection mechanism and method as the printing solution, or may be formed on the substrate 60 by another ejection mechanism and method. Thereby, printing can be simultaneously performed on the substrate 60, and thus an effect of printing a mixed solution by a spray mechanism can be obtained. The printing solution and the reaction solution 330 are preferably formed at the same position, but may be formed in a contact region where they can react with each other.
In addition, when the reaction liquid 330 and the printing solution are printed by different mechanisms, it is possible to realize a plurality of colors by adjusting the input amount of external energy and the mixing ratio of the reaction liquid and the printing solution.
Then, referring to fig. 4(c), the color L1- > L4 of the printing solution can be adjusted by inputting energy E to the reaction liquid 330. When the reaction solution 330 and the printing solution are formed in the same region, energy E may be input to the printing solution.
With the input of the energy E, the solvent 320 is cured while at least one of the size of the photonic crystal particle 310, the volume of the solvent 320, the surface optical property of the photonic crystal particle 310, the refractive index of the photonic crystal particle 310 or the solvent 320, and the shrinkage rate of the solvent 320 is changed. This is caused by the reaction liquid 330 reacting with at least one of the photonic crystal particles 310 and the solvent 320 as energy is input. Fig. 4(c) shows an example in which the refractive indices of the photonic crystal particles 310 and the solvent 320 are changed by the reaction solution 330 with the input of the energy E. The principle that the change in the size of the photonic crystal particle 310 or the change in the shrinkage of the solvent 320 causes the change in the wavelength of reflection is the same as that described in the first and second embodiments. If the refractive index of the photonic crystal particle 310 or the solvent 320 changes, the wavelength of the reflected light changes by L1- > L4. Thereby, the printing color can be changed.
As described above, the color changes according to the curing of the solvent 320, the size of the photonic crystal particle 310, the refractive index of the photonic crystal particle 310 or the solvent 320, and the shrinkage of the solvent 320, and thus, the fixed printing can be performed. Thus, the present invention can realize a plurality of colors by using one printing solution and by only adjusting the input amount of the energy E.
Fig. 5 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a fourth embodiment of the present invention.
According to a fourth embodiment of the present invention, a photonic crystal color printing method is characterized by including: (a) a step of preparing a printing solution including photonic crystal particles 410 that change reflected light according to an arrangement form and a solvent 420 in which the photonic crystal particles 410 are dispersed; (b) a step of forming a printing solution on the substrate 70; (c) a step of forming an anti-vaporization film 80 for preventing vaporization of the solvent 420 on the printing solution, the solvent 420 containing a substance that vaporizes in the use environment, and if the anti-vaporization film 80 is removed, the solvent 420 vaporizes, and the vaporization amount of the solvent 420 varies according to at least one of an exposure time in the use environment and external energy, thereby adjusting the arrangement pitch of the photonic crystal particles 410.
First, referring to fig. 5 (a), a printing solution may be prepared by dispersing photonic crystal particles 410 in a solvent 420. Then, referring to fig. 5 (b), a printing solution may be formed on the substrate 70. Fig. 5 (a) and 5 (b) are the same as fig. 2 (a) and 2(b), and thus a detailed description thereof is omitted.
However, in the fourth embodiment, the solvent 420 may contain a substance that is vaporized in the use environment. The use environment is understood to mean the ambient environment in which the product is present from after its manufacture until its use. In particular, the most important factors related to the vaporization of the solvent 420 in the change of the external environment may be temperature and humidity.
In addition, the substrate 70 may prevent vaporization of the solvent 420. The substrate 70 itself may be a substrate 70 coated with a layer-by-layer sealable material that does not leak out even if the solvent 420 is vaporized, or a film (not shown) that prevents vaporization.
Referring further to fig. 5 (b), after the printing solution is formed on the substrate 70, an evaporation prevention film 80 for preventing evaporation of the solvent 420 may be further formed on the printing solution. The vaporization preventing film 80 may be the same material as the substrate 70, or may be the same material as the vaporization preventing film applied to the substrate 70. The printing solution may be sealed between the substrate 70 and the anti-gassing film 80.
Then, referring to fig. 5 (c), the V solvent 420 may be vaporized by removing the vaporization preventing film 80. The solvent 420 starts to vaporize V if the evaporation prevention film 80 is removed, and the amount of evaporation of the solvent 420 is changed to adjust the arrangement pitch of the photonic crystal particles 410 based on at least one of the exposure time in the use environment and the external energy, so that the color L1- > L5 of the printing solution can be adjusted. On the other hand, the color L1- > L5 of the printing solution can be adjusted by removing the evaporation prevention film 80 and inputting energy E that can evaporate V the solvent 420 of the printing solution.
As the exposure time in the use environment increases, a greater amount of solvent 420 will vaporize V. Further, a larger amount of the solvent 420 is vaporized V with the input of external energy E such as heat, light, and air for vaporizing the solvent 420. As the volume of the solvent 420 gradually shrinks 420- >420 'as V vaporizes, the spacing between the self-aligned photonic crystal particles 410 in the solvent 420' becomes smaller. Thus, the reflected wavelength can be gradually changed by L1- > L5.
For example, in the initial stage of removing the evaporation preventing film 80, the distance between the photonic crystal particles 410 is large, and the wavelength of reflected light is long, so that red L1 appears. As time goes by, the solvent 420 is vaporized to V, and the volume shrinks 420- >420', the distance between the photonic crystal particles 410 is relatively reduced, and the wavelength of the reflected light is shortened, so that the light can gradually appear as yellow, turquoise, blue, or purple L5.
As described above, as the solvent 420 is evaporated V, the interval between the photonic crystal particles 410 is changed, thereby changing the color. Thus, the present invention can have an effect of realizing various colors by using one printing solution and only by adjusting the input amount of the energy E. In addition, since the color gradually changes according to the change of the use environment, the present invention has an effect of reflecting a considerable portion of the recording of the factors having high correlation with the vaporization of the solvent 420, i.e., temperature, humidity, light intensity, etc., during the change of the external environment. Using the principle, the photonic crystal color print can be applied in a color change sensor (sensor) reflecting an exposure environment.
Fig. 6 is a schematic diagram showing a photonic crystal color printing process and a color change process according to a fifth embodiment of the present invention.
According to a fifth embodiment of the present invention, a photonic crystal color printing method is characterized by including: (a) a step of preparing a printing solution including photonic crystal particles 510 that change reflected light according to an arrangement form and a solvent 520 in which the photonic crystal particles 510 are dispersed; (b) a step of forming a printing solution on the substrate 70; (c) a step of forming an anti-reaction film 80 for preventing the solvent 520 from reacting with the detection object in the use environment on the printing solution; the solvent 520 contains a substance that can react with the detection object in the use environment, and if the reaction prevention film 80 is removed, the solvent reacts with the detection object in the use environment to adjust the arrangement pitch of the photonic crystal particles.
First, referring to fig. 6 (a), a printing solution may be prepared by dispersing photonic crystal particles 510 in a solvent 520. Then, referring to fig. 6 (b), a printing solution may be formed on the substrate 70. Fig. 6 (a) and 6 (b) are the same as fig. 2 (a) and 2(b), and thus detailed descriptions thereof are omitted.
However, in the fifth embodiment, the solvent 520 may contain a substance that can react with the detection object in the use environment. The use environment is understood to mean the ambient environment in which the product is present from after its manufacture until its use. The detection object can be pH, UV, O of use environment3And the like.
In addition, the base material 70 prevents the solvent 520 from reacting with the detection object in the use environment. The substrate 70 itself may be a substrate 70 coated with a layer-by-layer sealable material that does not leak out even if the solvent 520 is vaporized, or a film (not shown) that prevents vaporization.
Referring further to (b) of fig. 6, after the printing solution is formed on the substrate 70, an anti-reaction film 80 for preventing the solvent 520 from reacting with the detection object in the use environment may be further formed on the printing solution. The anti-reaction film 80 may be the same material as the substrate 70, or may be the same material as an anti-vaporization film coated on the substrate 70. The printing solution may be sealed between the substrate 70 and the anti-reflection film 80.
Then, referring to fig. 6 (c), the solvent 520 is exposed to the use environment by removing the reaction preventing film 80. If the anti-reaction film 80 is removed, the solvent 520 is exposed to the use environment and reacts with the detection object of the use environment, so that the color L1 of the printing solution can be adjusted by adjusting the arrangement pitch of the photonic crystal particles 510>L6. pH, UV, O with the environment of use3The detection target reacts, and the size of the photonic crystal particles 510, the refractive index of the photonic crystal particles 510 or the solvent 520, the shrinkage rate of the solvent 520, and the like are changed, so that the arrangement pitch of the photonic crystal particles 510 can be adjusted. On the other hand, in the case of a liquid,the solvent 520 of the printing solution can be reacted [ with the object to be detected ] by removing the anti-reaction film 80 and inputting]The energy of (A) can adjust the color L1 of the printing solution>L6。
As the existence ratio, intensity, concentration, and time of the detection object of the use environment increase, more solvents 520 will react. As the reaction amount of the solvent 520 increases 520- >520', the distance between the self-aligned photonic crystal particles 510 becomes smaller 510- > 510'. Thus, the reflected wavelength L1- > L6 can be changed.
For example, after the substrate 70 is immersed in an acidic solution, the pitch between the photonic crystal particles 510 is large and the wavelength of reflected light is long at the initial stage of removing the antireflection film 80, so that red L1 appears. With the gradual progress of time, the acidic solution reacts with the solvent 520, the volume is shrunk 520- >520', the distance between the photonic crystal particles 510 is relatively reduced, the wavelength of reflected light is shortened, and therefore the photonic crystal particles can gradually appear yellow, green, blue and purple L6.
As described above, as the solvent 520 reacts with the detection object of the use environment, the pitch of the photonic crystal particles 510 changes, and thus the color can be changed. Thus, the present invention can have an effect of realizing various colors by using one printing solution and only by adjusting the input amount of the energy E. In addition, since the color gradually changes with the change of the use environment, the pH, UV, and O, which are the detection objects, can be reflected in the change process of the external environment3Etc., the intensity of the recording, the effect of a significant portion of the recording. Using the principle, the photonic crystal color print can be applied in a color change sensor (sensor) reflecting an exposure environment.
As described above, the present invention has an effect that a plurality of colors can be realized by a printing solution containing only one kind of photonic crystal particles. In addition, the present invention has an effect of allowing a user of a product to visually observe a color change accompanying a change in a use environment or an exposure environment, thereby visually confirming a numerical change amount of a test object.
According to the embodiment of the present invention, the printing method for realizing various colors can be applied to color printing, decorative film/overcoating/printing, surface treatment of solar cells, and the like in the field of fashion. Further, the color change sensor based on the change in color of the use environment can be applied to a forgery prevention element/genuine product authentication element, a product history display element, a distribution/expiration date display element, an external environment change detection element, and the like.
As described above, the present invention has been described by way of examples of preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art to which the present invention pertains without departing from the technical spirit of the present invention. Such variations and modifications are to be considered within the purview and scope of the claims appended hereto.

Claims (20)

1. A photonic crystal color printing method, the method comprising:
(a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed;
(b) a step of forming a printing solution on a substrate;
(c) a step of adjusting the color of the printing solution by inputting energy to the printing solution,
in the step (c), the volume of the solvent is changed according to the input amount of energy, thereby adjusting the arrangement pitch of the photonic crystal particles.
2. A photonic crystal color printing method, the method comprising:
(a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed;
(b) a step of forming a printing solution on a substrate;
(c) a step of adjusting the color of the printing solution by inputting energy to the printing solution,
in the step (c), at least one of a size of the photonic crystal particle, a refractive index of the photonic crystal particle, and a refractive index of the solvent is changed according to the input amount of the energy, thereby adjusting a characteristic of the photonic crystal reflected light based on the photonic crystal particle.
3. A photonic crystal color printing method, the method comprising:
(a) preparing a printing solution and a reaction solution, wherein the printing solution comprises photonic crystal particles which change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed, and the reaction solution reacts with at least one of the photonic crystal particles and the solvent when energy is input;
(b) a step of forming a printing solution and a reaction liquid on a substrate;
(c) a step of adjusting the color of the printing solution by inputting energy to the reaction liquid,
in the step (c), the reaction solution reacts with at least one of the photonic crystal particles and the solvent to change at least one of the size of the photonic crystal particles, the volume of the solvent, the refractive index of the photonic crystal particles, and the refractive index of the solvent, thereby adjusting the color of the printing solution.
4. A photonic crystal color printing method, the method comprising:
(a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed;
(b) a step of forming a printing solution on a substrate;
(c) a step of forming an anti-vaporization film for preventing vaporization of the solvent on the printing solution,
the solvent contains a substance that vaporizes in the environment of use,
when the evaporation preventing film is removed, the solvent is evaporated, and the amount of evaporation of the solvent is changed according to at least one of the exposure time in the use environment and the external energy, thereby adjusting the arrangement pitch of the photonic crystal particles.
5. A photonic crystal color printing method, the method comprising:
(a) a step of preparing a printing solution including photonic crystal particles that change reflected light according to an arrangement form and a solvent in which the photonic crystal particles are dispersed;
(b) a step of forming a printing solution on a substrate;
(c) a step of forming an anti-reaction film for preventing a solvent from reacting with an object of detection in a use environment on the printing solution,
the solvent contains a substance that reacts with the detection object in the use environment,
if the anti-reaction film is removed, the solvent reacts with the detection object in the use environment, thereby adjusting the arrangement pitch of the photonic crystal particles.
6. The photonic crystal color printing method of any one of claims 1 to 5, wherein the photonic crystal particles comprise polystyrene, polymethylmethacrylate, SiOx、TiOx、FeOxAt least one of Fe, Ni, Co and Ag.
7. The photonic crystal color printing method of any one of claims 1 to 5, wherein the photonic crystal particles have a size of 10nm to 1 μm.
8. The photonic crystal color printing method of any one of claims 1 to 3, wherein the energy is at least one of optical energy and thermal energy.
9. The photonic crystal color printing method of claim 8, wherein at least two energies are input, one of the energies being used to cure the solvent.
10. The photonic crystal color printing method of any one of claims 1 to 5, wherein a light absorbing film or a black layer is formed on a surface of the substrate.
11. The photonic crystal color printing method of claim 10, wherein a black solution for forming a light absorption film or a black layer is formed on the substrate before the step (b), and the black solution is cured based on the energy input in the step (c) and the light absorption film or the black layer is formed.
12. The photonic crystal color printing method of any one of claims 1 to 5, wherein, in the step (b), the printing solution is formed on the substrate in the form of a QR code, a barcode, an image, a pattern, a letter, a figure, or a combination thereof.
13. The photonic crystal color printing method of claim 3, wherein in the step (b), the color is adjusted according to a mixing ratio of the printing solution and the reaction liquid.
14. A photonic crystal color print, a printing solution formed on a substrate, wherein the printing solution comprises:
photonic crystal particles that change reflected light according to an arrangement form; and
a solvent in which photonic crystal particles are dispersed,
the volume of the solvent is changed according to the input amount of energy, and the color of the reflected light is changed by adjusting the arrangement pitch of the photonic crystal particles.
15. A photonic crystal color print, a printing solution formed on a substrate, wherein the printing solution comprises:
photonic crystal particles that change reflected light according to an arrangement form; and
a solvent in which photonic crystal particles are dispersed,
at least one of a size of the photonic crystal particle, a refractive index of the photonic crystal particle, and a refractive index of the solvent is changed according to an input amount of the energy to adjust a characteristic of the photonic crystal reflected light based on the photonic crystal particle.
16. A photonic crystal color printed matter, a printing solution and a reaction liquid are formed on a substrate, wherein the printing solution comprises:
photonic crystal particles that change reflected light according to an arrangement form; and
a solvent in which photonic crystal particles are dispersed,
the reaction liquid reacts with at least one of the photonic crystal particles and the solvent to change at least one of the size of the photonic crystal particles, the volume of the solvent, the refractive index of the photonic crystal particles, and the refractive index of the solvent, thereby changing the color of the printing solution.
17. A photonic crystal color print, a printing solution formed on a substrate, wherein the printing solution comprises:
photonic crystal particles that change reflected light according to an arrangement form; and
a solvent in which photonic crystal particles are dispersed,
an anti-vaporization film for preventing vaporization of the solvent is formed on the printing solution,
the solvent contains a substance that vaporizes in the environment of use,
the solvent is vaporized if the vaporization preventing film is removed, and the amount of vaporization of the solvent is changed according to at least one of an exposure time in a use environment and external energy, thereby changing the color of reflected light by adjusting the arrangement pitch of the photonic crystal particles.
18. A photonic crystal color print, a printing solution formed on a substrate, wherein the printing solution comprises:
photonic crystal particles that change reflected light according to an arrangement form; and
a solvent in which photonic crystal particles are dispersed,
an anti-reaction film for preventing the solvent from reacting with the detection object in the use environment is formed on the printing solution,
the solvent contains a substance that reacts with the detection object in the use environment,
if the reaction preventing film is removed, the solvent reacts with the detection object of the use environment, thereby changing the color of the reflected light by adjusting the arrangement pitch of the photonic crystal particles.
19. The photonic crystal color print of claim 18, wherein the detection target of the usage environment is pH, UV, O3Any one of them.
20. A color change sensor comprising the photonic crystal color print of claim 18 or claim 19.
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