CN113589573A - Intelligent liquid crystal dimming film capable of sensing ambient light change - Google Patents
Intelligent liquid crystal dimming film capable of sensing ambient light change Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F1/13345—Network or three-dimensional gels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Dispersion Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention belongs to the technical field of building decoration, intelligent home furnishing, electronic curtains, automobile dimming windows and the like, and relates to an intelligent liquid crystal dimming film capable of sensing ambient light changes. The intelligent liquid crystal dimming film comprises a first transparent conductive substrate layer, a cholesteric liquid crystal composition/polymer network composite layer and a second transparent conductive substrate layer which are sequentially overlapped, wherein the cholesteric liquid crystal composition/polymer network composite layer is formed by photoinitiating and polymerizing nematic liquid crystal molecules, photopolymerizable monomers, visible light initiators and chiral optical switch molecules with reversible photoresponse and chiral dopants to form photoinitiating and polymerizing. According to the invention, by doping chiral molecules with the reversible photoisomerization characteristic, the common liquid crystal dimming film has the characteristic of sensing ambient light, so that the novel energy-saving light-regulated liquid crystal intelligent dimming film is realized.
Description
Technical Field
The invention belongs to the technical fields of building decoration, intelligent home furnishing, electronic curtains, automobile dimming windows and the like, and particularly relates to a photoresponse liquid crystal intelligent window and a preparation method thereof.
Background
Since the last century, the widespread use of liquid crystal devices has greatly changed people's lives, liquid crystal molecules have attracted the attention of researchers in various countries due to their unique physicochemical properties, and further exploration and improvement of liquid crystal device performance has become one of the hot spots of research. Among them, a liquid crystal/polymer composite material obtained by compounding liquid crystal molecules with a polymer network is preferred because of its excellent mechanical properties and stability. The liquid crystal/polymer composite material has various functions and can be used in the fields of intelligent windows, electronic paper, displays and the like. When the liquid crystal intelligent window is used, most of the current mainstream technologies utilize dielectric anisotropy of liquid crystal molecules to regulate and control the optical performance of the intelligent window by controlling the existence of an electric field applied to two poles of the liquid crystal intelligent window. The methods can realize the function of the intelligent window, but the intelligent window regulated by the electric field usually needs higher driving voltage, and the electric field needs to be continuously applied to maintain the transparent state of the intelligent window, which undoubtedly increases the consumption of energy, is not energy-saving enough, limits the application occasions of the intelligent window, also increases the risk of short circuit, and is not safe enough.
Disclosure of Invention
The invention aims to provide an intelligent liquid crystal light adjusting film which can change the light transmittance of the intelligent liquid crystal light adjusting film by sensing the intensity change of ambient light and can realize artificial light transmittance adjustment and privacy shielding effects by the presence or absence of an external electric field. By using green light or incandescent lamp for illumination, the light adjusting film can be in a transparent state, and no scattering effect is exerted on incident light; the light adjusting film is irradiated by sunlight, blue-violet light or ultraviolet light, and becomes a scattering state, so that incident light is blocked; the dimming film can be restored to the original transparent state by again using a green light or an incandescent lamp for illumination. When an external electric field is applied to the positive electrode and the negative electrode of the substrate, the liquid crystal film can generate a strong scattering effect on incident light, the light transmittance is reduced at the moment, and the applied electric field is removed, so that the light transmittance of the liquid crystal film can be restored to an initial transparent state. The above cyclic variation may be repeated a plurality of times.
In order to achieve the above object, the invention provides an intelligent liquid crystal dimming film for sensing ambient light changes, which includes a first transparent conductive substrate layer, a cholesteric liquid crystal composition/polymer network composite layer, and a second transparent conductive substrate layer, which are sequentially stacked, wherein the cholesteric liquid crystal composition/polymer network composite layer is formed by photoinitiating and polymerizing nematic liquid crystal molecules, photopolymerizable monomers, visible light initiators, chiral optical switch molecules with reversible optical responsivity, and chiral dopants to form photoinitiating and polymerizing;
based on the total weight of the cholesteric liquid crystal composition/polymer network composite layer, the content of the liquid crystal molecules is 79-97.8 wt%, the content of the photopolymerizable monomers is 1-10 wt%, the content of the photoinitiator is 0.1-1 wt%, the content of the chiral optical switch molecules with the reversible optical responsivity is 1-5 wt%, and the content of the chiral agent is 0.1-5 wt%;
the chiral optical switch molecule and the chiral dopant with the reversible optical responsivity are selected from a left-handed chiral optical switch molecule and a right-handed chiral dopant or a right-handed chiral switch molecule and a left-handed chiral dopant.
The invention also provides a preparation method of the intelligent liquid crystal dimming film for sensing the change of the ambient light, which comprises the following steps:
the method comprises the following steps: arranging an orientation layer with the function of vertically orienting liquid crystals in advance on one surface of the indium tin oxide transparent conductive substrate layer by using a vertical orientation agent;
step two: the alignment surfaces of the indium tin oxide transparent conductive substrate layers are opposite, an empty liquid crystal box is obtained by bonding glue doped with spacing balls, the empty liquid crystal box is placed on a hot table, a light-shading effect is achieved, a light-polymerizable monomer, liquid crystal molecules, chiral optical switch molecules with reversible light responsiveness, a photoinitiator and a dopant with opposite chirality are uniformly mixed to obtain a mixed solution, and the mixed solution is uniformly distributed in the liquid crystal box by utilizing a capillary effect; and
step three: irradiating the liquid crystal box by using visible light with the wavelength of 365-550 nanometers to initiate polymerization reaction to form a cholesteric liquid crystal composition/polymer network composite layer;
the vertical alignment agent is DMOAP or PI.
The technical scheme of the invention has the following beneficial effects:
(1) the invention prepares a liquid crystal dimming film with light transmittance regulated and controlled along with the change of environmental light intensity and an external electric field, and the common liquid crystal dimming film has the characteristic of sensing environmental light by doping chiral molecules with reversible light isomerization characteristic, thereby realizing a novel energy-saving light regulation and control liquid crystal intelligent dimming film.
(2) When the regulation and control process is realized, the expected effect can be achieved through common natural light and incandescent lamps, the use condition is loose, and the regulation and control mode is simple.
(3) The invention can realize the regulation and control process by inducing the change of the external environment light intensity and regulating and controlling the optical performance of the liquid crystal film by an external electric field.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of a smart liquid crystal dimming film.
Fig. 2(a) is a schematic structural diagram illustrating a smart liquid crystal dimming film for sensing ambient light changes in a transparent state after being illuminated by green light or an incandescent lamp according to an embodiment of the present invention.
Fig. 2(b) is a schematic structural diagram illustrating a smart liquid crystal dimming film for sensing ambient light changes in a scattering state after receiving blue-violet light, ultraviolet light, solar light and thermal effects caused by the light according to an embodiment of the present invention.
Fig. 3(a) shows a schematic diagram of a power-off state of the intelligent liquid crystal dimming film for sensing ambient light changes according to an embodiment of the present invention.
Fig. 3(b) shows a schematic diagram of the power-on state of the intelligent liquid crystal dimming film for sensing ambient light changes according to one embodiment of the invention.
Fig. 4 is a schematic diagram of the effect of the intelligent liquid crystal dimming film under different lights:
the intelligent liquid crystal dimming film is characterized by comprising a light source, a light source controller and a light source controller, wherein (a) shows an effect schematic diagram that the intelligent liquid crystal dimming film for sensing the change of ambient light is in a transparent state in an initial state in the regulation process, and corresponds to early morning hours with weak light and low temperature in real life;
(b) the effect schematic diagram of the intelligent liquid crystal dimming film for sensing the change of ambient light, which is disclosed by the embodiment of the invention, is shown, along with the gradual enhancement of sunlight and the gradual rise of temperature in the regulation and control process, the light transmittance of the dimming film is reduced and the color is deepened after the dimming film is illuminated by the sun and the dimming film is converted into a scattering state, and the intelligent liquid crystal dimming film corresponds to midday time with stronger light and higher temperature in real life;
(c) the effect schematic diagram that the light transmittance of the intelligent liquid crystal dimming film for sensing the change of the ambient light increases and the color becomes lighter and the intelligent liquid crystal dimming film is changed into a transparent state after being illuminated by an incandescent lamp along with the gradual reduction of sunlight and the gradual reduction of temperature in the regulation and control process of the intelligent liquid crystal dimming film for sensing the change of the ambient light is shown, and corresponds to the time division at night when the light is weaker and the temperature is lower in real life.
Fig. 5(a) is a diagram illustrating a smart liquid crystal dimming film for sensing ambient light changes in a transparent state after being illuminated by an incandescent lamp according to an embodiment of the invention.
Fig. 5(b) is a diagram illustrating a smart liquid crystal dimming film for sensing ambient light changes in a scattering state after being illuminated by the sun according to an embodiment of the present invention.
Reference numerals
001 first transparent conductive substrate layer
002 first transparent substrate orientation layer
003 cholesteric liquid crystal composition/polymer network composite layer
A Polymer network
B liquid crystal molecule
Chiral optical switch molecule with reversible optical responsivity C
D chiral dopant
004 second transparent substrate alignment layer
005 second transparent conductive substrate layer
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The invention provides an intelligent liquid crystal dimming film for sensing environmental light change, which is characterized by comprising a first transparent conductive substrate layer, a cholesteric liquid crystal composition/polymer network composite layer and a second transparent conductive substrate layer which are sequentially superposed, wherein the cholesteric liquid crystal composition/polymer network composite layer is formed by photoinitiating and polymerizing nematic liquid crystal molecules, photopolymerizable monomers, visible light initiators, chiral light switch molecules with reversible light responsiveness and chiral dopants;
based on the total weight of the cholesteric liquid crystal composition/polymer network composite layer, the content of the liquid crystal molecules is 79-97.8 wt%, the content of the photopolymerizable monomers is 1-10 wt%, the content of the photoinitiator is 0.1-1 wt%, the content of the chiral optical switch molecules with the reversible optical responsivity is 1-5 wt%, and the content of the chiral agent is 0.1-5 wt%;
the chiral optical switch molecule and the chiral dopant with the reversible optical responsivity are selected from a left-handed chiral optical switch molecule and a right-handed chiral dopant or a right-handed chiral switch molecule and a left-handed chiral dopant.
In the technical scheme, after the intelligent liquid crystal dimming film for sensing the change of the ambient light is irradiated by sunlight, blue-violet light or ultraviolet light, when the light is incident, the transmitted light is distributed in a wider angle range and is in an opaque scattering state; when the intelligent liquid crystal dimming film for sensing the change of the ambient light is irradiated by green light or an incandescent lamp and the light is incident, the transmitted light is distributed in a narrow angle range and is in a transparent state.
According to the invention, by utilizing the characteristic that cholesteric liquid crystals present different optical properties in different phase states, two different chiral dopants with opposite handedness are added into a system, wherein one is a non-photosensitive chiral agent, and the other is an optical switch molecule with opposite handedness and reversible optical responsivity, at the beginning, the chiral effects of the two chiral dopants are mutually offset by controlling the contents of the two chiral agents, liquid crystal molecules are vertically arranged under the action of the orientation layers of the first and second transparent conductive substrate layers, and a liquid crystal dimming film presents a transparent state in macroscopic view; when sunlight, blue-violet light or ultraviolet light is used for irradiating the light, the chiral optical switch molecules with reversible optical responsivity are subjected to photoisomerization, the chiral action of the chiral optical switch molecules is enhanced, the original chiral action balance in the system is broken, the nematic liquid crystal is changed into cholesteric liquid crystal under the chiral action, the texture of the liquid crystal is a typical focal conic texture of the cholesteric liquid crystal, and macroscopically, the liquid crystal light-adjusting film has a strong scattering effect on incident light, so that the light adjustment and control are realized; when the dimming film is irradiated again by a green light or an incandescent lamp, the chiral contribution of the chiral optical switch molecules with the reversible optical responsivity can be recovered to the initial state, the phase state of the liquid crystal is recovered to the vertical field state, and macroscopically, the liquid crystal dimming film is recovered to the transparent state. As the chiral optical switch molecules used have reversible optical responsivity, the prepared liquid crystal light adjusting film also has the repeatability of adjustment and control. In addition, when the liquid crystal used in the cholesteric liquid crystal composition/polymer network composite layer is pure negative liquid crystal, liquid crystal molecules tend to be arranged in a direction perpendicular to an electric field when the negative liquid crystal is in the electric field due to dielectric anisotropy of the negative liquid crystal, the long axes of the molecules are parallel to the substrate, so that the liquid crystal has a strong scattering effect on incident light, and after the electric field is removed, the liquid crystal molecules return to an initial vertical state under the action of a vertical orientation layer on the surface of the substrate layer, and the light transmittance is increased. The regulation is also reproducible.
In the invention, the cholesteric liquid crystal is limited in each polymer grid, so that the scattering state of the liquid crystal dimming film can be improved, and the stability of the liquid crystal dimming film can be improved.
According to the present invention, preferably, the first transparent conductive substrate layer and the second transparent conductive substrate layer are indium tin oxide transparent conductive substrate layers made of the same material;
preferably, one side of the indium tin oxide transparent conductive substrate layer is provided with an orientation layer.
Preferably, the substrate is made of at least one of glass, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate and polyethylene terephthalate.
In the invention, in the initial state, under the condition that the cholesteric liquid crystal composition/polymer network composite layer is not stimulated by an external field, the liquid crystal mixture is in ordered vertical orientation, the blocking effect on incident light is not generated, and the light adjusting film is in a transparent state; when the film is irradiated by sunlight, blue-violet light or ultraviolet light and the heating effect caused by the illumination, the light transmittance is reduced, and the light adjusting film is in a scattering state; when the light is irradiated by an incandescent lamp or green light, the light transmittance is increased again, and the light adjusting film is in a transparent state.
In the invention, if the current environmental conditions are not enough to enable the cholesteric liquid crystal composition/polymer network composite layer to be converted from a transparent state to a scattering state, but actual requirements for reducing the light transmittance of the light modulation film or actual applications such as need of shielding privacy scenes and the like are met, the light modulation film can realize required functions through an external electric field.
According to the present invention, preferably, the nematic liquid crystal molecules are selected from positive liquid crystals, preferably selected from at least one of SLC1717, E7, E44, E48 and SLC7011, or negative liquid crystals, preferably selected from SLC10V520-200 and/or SLC12V 620-200.
The liquid crystal light adjusting film made of positive liquid crystal can realize the basic effect of self light transmittance regulation and control along with light-heat, and the liquid crystal light adjusting film made of negative liquid crystal can realize the effect of self light transmittance regulation and control along with light-heat, and can further regulate and control the light transmittance of the liquid crystal film through an external electric field so as to deal with the condition that certain environments are not suitable for regulating and controlling the light transmittance of the liquid crystal film, and a user can select one of two types of liquid crystal films according to the actual requirements of the user.
According to the present invention, preferably, the photo-polymerizable monomer is a liquid crystalline photo-polymerizable monomer, and is at least one selected from the group consisting of C6M, LC242, and LC 756.
According to the present invention, preferably, the visible light initiator is any one of bis 2, 6-difluoro-3-pyrrol-ylphenyltitanocene, 1-aryl-2- (triisopropylsilyl) ethane-1, 2-dione, and tetrakis (2,4, 6-trimethylbenzoyl) silane.
According to the invention, preferably, the chiral optical switch molecule with reversible optical responsiveness is synthesized by a laboratory, preferably, as shown in a general formula I, M is selected from a group shown in a general formula II or a general formula III, wherein n is an integer of 1-6; or as shown in a general formula IV, M in the general formula IV is selected from a general formula V and a general formula VI, N is selected from a group shown in a general formula VII, and M is an integer of 5-7.
The chiral optical switch molecule with the reversible optical responsivity can generate the isomeric reversible change of light from left to right as shown in a formula 1 under the illumination of green light or an incandescent lamp; the photoisomerization reaction from right to left as shown in formula 1 can occur under blue-violet light, ultraviolet light or solar illumination.
According to the present invention, preferably, the optical switch molecule is selected from at least one chiral compound of the structure shown in the general formula a-1 or the general formula a-2, and the chirality of the optical switch molecule is related to the spatial conformation characteristics of the molecules of the following general formula; wherein R represents C1-C4N is an integer of 1 to 6, m is an integer of 5 to 7;
preferably, the chiral optical switch molecule with reversible optical responsivity is synthesized by a laboratory.
Preferably, the right-handed chiral optical switch molecules have right-handed chirality, which can convert common nematic liquid crystal into right-handed helical cholesteric liquid crystal.
Preferably, the left-handed chiral optical switch molecule has left-handed chirality, which can convert common nematic liquid crystal into left-handed helical cholesteric liquid crystal
According to the present invention, preferably, the left-handed chiral dopant may be self-synthesized or selected from at least one of the commercial products S811, S1011, S2011 or S5011.
Preferably, the left-handed chiral dopant is selected from at least one of the commercial products S811, S1011, S2011 and S5011.
According to the present invention, preferably, the right-handed chiral dopant may be synthesized by itself or selected from at least one of the commercial products R811, R1011, R2011 or R5011.
Preferably, the right-handed chiral dopant is selected from at least one of the commercial products R811, R1011, R2011 and R5011.
The invention provides a preparation method of an intelligent liquid crystal dimming film for sensing the change of ambient light, which comprises the following steps:
the method comprises the following steps: arranging an orientation layer with the function of vertically orienting liquid crystals in advance on one surface of the indium tin oxide transparent conductive substrate layer by using a vertical orientation agent;
step two: the alignment surfaces of the indium tin oxide transparent conductive substrate layers are opposite, an empty liquid crystal box is bonded by glue doped with spacing balls and placed on a hot bench, a light-shielding layer is used for uniformly and uniformly mixing a light-polymerizable monomer, liquid crystal molecules, chiral optical switch molecules with reversible light responsiveness, a photoinitiator and a chiral agent to obtain a mixed solution, and the mixed solution is uniformly distributed in the liquid crystal box by utilizing the capillary action; and
step three: irradiating the liquid crystal box by using visible light with the wavelength of 365-550 nanometers to initiate polymerization reaction to form a cholesteric liquid crystal composition/polymer network composite layer;
the vertical alignment agent is DMOAP or PI.
According to the invention, preferably, the spacing balls are polystyrene microspheres, the particle size is controlled to be 6-20 micrometers, and the dosage is 0.1-1.0 wt% of the content of the mixed solution;
preferably, the temperature of the hot table is 90-120 ℃;
preferably, the visible light is green light.
The invention is further illustrated by the following examples:
example 1
According to an embodiment of the present invention, referring to fig. 1, the intelligent liquid crystal dimming film for sensing ambient light changes includes a first transparent conductive substrate layer 001, a first transparent substrate orientation layer 002, a cholesteric liquid crystal composition/polymer network composite layer 003, a second transparent substrate orientation layer 004 and a second transparent conductive substrate layer 005, which are stacked; the material for forming the cholesteric liquid crystal composition/polymer network composite layer comprises a polymer network A, liquid crystal molecules B, chiral optical switch molecules C with reversible optical responsivity and a left-handed chiral dopant D.
Cutting a first transparent conductive substrate and a second transparent conductive substrate made of glass materials to proper sizes, washing and drying, then uniformly spreading a polyimide vertical orientation agent on the surfaces of the substrates by using a spin coater, wherein the polyimide vertical orientation agent is a common commercial product, curing at a high temperature of 200 ℃ to obtain the first transparent conductive substrate layer and the second transparent conductive substrate layer with vertical orientation layers, oppositely placing orientation planes, bonding the two substrates by using glue doped with polystyrene spacers with the particle size of 6 microns to obtain an empty liquid crystal box, and placing the empty liquid crystal box on a heating table at 90-120 ℃.1, 4-bis [4- (6-acryloyloxy hexyloxy) benzoyloxy ] -2-methylbenzene, 2 wt% of chiral optical switch molecules with reversible optical responsiveness, 0.4 wt% of left-handed chiral dopant S5011, 0.1 wt% of bis 2, 6-difluoro-3-pyrrol-phenyl titanocene and 96.5 wt% of nematic liquid crystal slc1717 are uniformly mixed in a dark place and filled into a liquid crystal box by utilizing the capillary action. And initiating a polymerization reaction under the irradiation of green light with the wavelength of 520nm to prepare the intelligent liquid crystal dimming film 1 for sensing the change of ambient light. When the obtained light adjusting film is irradiated by sunlight, blue light or ultraviolet light, the light adjusting film is changed into a scattering state from a transparent state; when the resulting film is illuminated with green light or an incandescent lamp, the film changes from a scattering state to a transparent state.
Example 2
Cutting a first transparent conductive substrate and a second transparent conductive substrate made of glass materials to proper sizes, washing, drying, soaking for 2 hours at 80 ℃ by using 5 wt% of DMOAP solution, drying to obtain a first transparent conductive substrate layer and a second transparent conductive substrate layer with vertical orientation layers, placing the orientation layers in an opposite mode, bonding the two substrates by using glue doped with polystyrene spacers with the particle size of 12 microns to obtain an empty liquid crystal box, and placing the empty liquid crystal box on a hot bench at 90-120 ℃.3 weight percent of 1, 4-bis [4- (6-acryloyloxy hexyloxy) benzoyloxy ] -2-methylbenzene, 3 weight percent of chiral optical switch molecules with reversible optical responsiveness, 0.3 weight percent of left-handed chiral dopant S5011, 0.1 weight percent of bis 2, 6-difluoro-3-pyrrolylphenyltitanocene and 93.6 weight percent of nematic liquid crystal slc1717 are uniformly mixed in a dark place and filled into a liquid crystal box by utilizing the capillary action. The polymerization reaction is initiated under the irradiation of green light with the wavelength of 520nm to prepare the intelligent liquid crystal dimming film 2 for sensing the change of ambient light, and the internal structure of the dimming film is shown in figure 1. When the obtained light adjusting film is irradiated by sunlight, blue light or ultraviolet light, the light adjusting film is changed into a scattering state from a transparent state; when the resulting film is illuminated with green light or an incandescent lamp, the film changes from a scattering state to a transparent state. The regulation principle is shown in fig. 3(a) -3(b), and the real object effect is shown in fig. 5(a) -5 (b).
Example 3
Cutting a first transparent conductive substrate and a second transparent conductive substrate made of glass materials to proper sizes, washing, drying, soaking for 2 hours at 80 ℃ by using 5 wt% of DMOAP solution, drying to obtain a first transparent conductive substrate layer and a second transparent conductive substrate layer with vertical orientation layers, placing the orientation layers in an opposite mode, bonding the two substrates by using glue doped with polystyrene spacers with the particle size of 12 microns to obtain an empty liquid crystal box, and placing the empty liquid crystal box on a hot bench at 90-120 ℃.3 weight percent of 1, 4-bis [4- (6-acryloyloxy hexyloxy) benzoyloxy ] -2-methylbenzene, 3 weight percent of chiral optical switch molecules with reversible optical responsiveness, 5 weight percent of left-handed chiral dopant S811, 0.1 weight percent of bis 2, 6-difluoro-3-pyrrolylphenyltitanocene and 93.6 weight percent of nematic liquid crystal SLC12V620-200 are uniformly mixed in a dark place and filled into a liquid crystal box by utilizing capillary action. The polymerization reaction is initiated under the irradiation of green light with the wavelength of 520nm to prepare the intelligent liquid crystal dimming film 3 for sensing the change of ambient light, and the internal structure of the dimming film is shown in figure 1. When a sufficiently large electric field is applied to the substrate, the negative liquid crystal is prone to have the molecular long axis arranged parallel to the substrate under the action of the electric field, so that the negative liquid crystal has a strong scattering effect on incident light, the light transmittance is greatly reduced, and the light adjusting film is in an opaque state; if the electric field is removed, under the anchoring action of the orientation layer on the inner surface of the substrate and the polymer network, the liquid crystal molecules are restored to the prior vertical state by field, and the light modulation film is in a transparent state, and the regulation principle is shown in fig. 4.
According to the embodiment of the invention, the intelligent liquid crystal dimming film for sensing the change of the ambient light has good optical performance, the thickness of the cholesteric liquid crystal composition/polymer network composite layer 003 in the intelligent liquid crystal dimming film can be 6-20 microns, and the intelligent liquid crystal dimming film changes along with the change of the content of the added chiral optical switch molecules with the reversible optical responsiveness. If the thickness of the cholesteric liquid crystal composition/polymer network composite layer 003 is less than 6 microns, the scattering effect of the cholesteric liquid crystal composition/polymer network composite layer 003 in a scattering state is not obvious; if the thickness of the cholesteric liquid crystal composition/polymer network composite layer 003 is greater than 20 microns, the transmissive effect of the cholesteric liquid crystal composition/polymer network composite layer 003 in the transparent state is not significant.
According to the embodiment of the present invention, referring to fig. 3(a) -3(b), when the intelligent liquid crystal dimming film for sensing the change of ambient light realizes the reversible light regulation, the specific type of the external light source used is not limited, as long as the chiral optical switch molecule with reversible light responsiveness contained in the cholesteric liquid crystal composition/polymer network composite layer is subjected to photoisomerization, the liquid crystal phase changes accordingly, and finally the optical characteristics of the dimming film change, and a person skilled in the art can correspondingly select the type of the light source used according to the actual light regulation and control effect required by the display.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An intelligent liquid crystal dimming film capable of sensing ambient light change is characterized by comprising a first transparent conductive substrate layer, a cholesteric liquid crystal composition/polymer network composite layer and a second transparent conductive substrate layer which are sequentially superposed, wherein the cholesteric liquid crystal composition/polymer network composite layer is formed by photoinitiating and polymerizing nematic liquid crystal molecules, a photopolymerizable monomer, a visible light initiator, chiral optical switch molecules with reversible optical responsivity and a chiral dopant;
based on the total weight of the cholesteric liquid crystal composition/polymer network composite layer, the content of the nematic liquid crystal molecules is 79-97.8 wt%, the content of the photopolymerizable monomers is 1-10 wt%, the content of the photoinitiator is 0.1-1 wt%, the content of the chiral optical switch molecules with the reversible optical responsivity is 1-5 wt%, and the content of the chiral dopant is 0.1-5 wt%;
the chiral optical switch molecule and the chiral dopant with the reversible optical responsivity are selected from a left-handed chiral optical switch molecule and a right-handed chiral dopant or a right-handed chiral switch molecule and a left-handed chiral dopant.
2. The intelligent liquid crystal dimming film for sensing ambient light changes of claim 1, wherein the first transparent conductive substrate layer and the second transparent conductive substrate layer are indium tin oxide transparent conductive substrate layers made of the same material;
and one surface of the indium tin oxide transparent conductive substrate layer is provided with an orientation layer.
3. An intelligent liquid crystal dimming film for sensing ambient light changes according to claim 1, wherein the nematic liquid crystal molecules are selected from positive liquid crystal, preferably at least one selected from SLC1717, E7, E44, E48 and SLC7011, or negative liquid crystal, preferably selected from SLC10V520-200 and/or SLC12V 620-200.
4. An intelligent liquid crystal dimming film for sensing ambient light changes as claimed in claim 1, wherein the photo-polymerizable monomer is a liquid crystalline photo-polymerizable monomer selected from at least one of C6M, LC242 and LC 756.
5. The intelligent liquid crystal dimming film for sensing ambient light changes of claim 1, wherein the visible light initiator is at least one of bis 2, 6-difluoro-3-pyrrol-ylphenyltitanocene, 1-aryl-2- (triisopropylsilyl) ethane-1, 2-dione, and tetrakis (2,4, 6-trimethylbenzoyl) silane.
6. The intelligent liquid crystal dimming film for sensing the change of ambient light according to claim 1, wherein the chiral optical switch molecule with the reversible optical responsivity is shown as a general formula I, wherein M in the general formula I is selected from a group shown as a general formula II or a general formula III, and n is an integer of 1-6; or shown as a general formula IV, M in the general formula IV is selected from a group shown as a general formula V or a general formula VI, N is selected from a group shown as a general formula VII, and M is an integer of 5-7;
7. the intelligent liquid crystal dimming film for sensing the change of the ambient light according to claim 6, wherein the optical switch molecules are selected from at least one chiral compound with a structure shown in a general formula a-1 or a general formula a-2, and the chirality of the optical switch molecules is related to the spatial conformation characteristics of the molecules with the following general formula; wherein R represents C1-C4N is an integer of 1 to 6, m is an integer of 5 to 7;
8. the intelligent ambient light change perceiving liquid crystal dimming film as claimed in claim 1, wherein said left-handed chiral dopant is preferably selected from at least one of S811, S1011, S2011 and S5011, and said right-handed chiral dopant is preferably selected from at least one of R811, R1011, R2011 and R5011.
9. A method for preparing an intelligent liquid crystal light adjusting film for sensing the change of ambient light according to any one of claims 1 to 8, comprising the following steps:
the method comprises the following steps: arranging an orientation layer with the function of vertically orienting liquid crystals in advance on one surface of the indium tin oxide transparent conductive substrate layer by using a vertical orientation agent;
step two: the surfaces, provided with the orientation layers, of the indium tin oxide transparent conductive substrate layer are opposite, an empty liquid crystal box is obtained by bonding glue doped with spacing balls, the liquid crystal box is placed on a hot table, a light-shielding layer is used for uniformly mixing a light-polymerizable monomer, liquid crystal molecules, chiral optical switch molecules with reversible light responsiveness, a photoinitiator and a dopant with opposite chirality to obtain a mixed solution, and the mixed solution is uniformly distributed in the liquid crystal box by utilizing capillary action; and
step three: irradiating the liquid crystal box by using visible light with the wavelength of 365-550 nanometers to initiate polymerization reaction to form a cholesteric liquid crystal composition/polymer network composite layer;
the vertical alignment agent is DMOAP and/or PI.
10. The preparation method of claim 9, wherein the spacer beads are polystyrene microspheres with a particle size of 6-20 microns, and the amount of the spacer beads is 0.1-1.0 wt% of the content of the mixed solution;
the temperature of the heating table is 90-120 ℃;
the visible light is green light.
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