CN106646985B - Infrared reflecting device with tunable wave band and preparation method thereof - Google Patents
Infrared reflecting device with tunable wave band and preparation method thereof Download PDFInfo
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- CN106646985B CN106646985B CN201611008519.XA CN201611008519A CN106646985B CN 106646985 B CN106646985 B CN 106646985B CN 201611008519 A CN201611008519 A CN 201611008519A CN 106646985 B CN106646985 B CN 106646985B
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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
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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
- G02F1/137—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
-
- 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
Abstract
The invention discloses an infrared reflecting device with tunable wave band and a preparation method thereof, chiral dopant, photopolymerisable liquid crystal monomer, photoinitiator and negative liquid crystal are mixed to obtain liquid crystal mixture, the liquid crystal mixture is filled into two transparent substrates which can be connected with voltage, the photoinitiator initiates the photopolymerisable liquid crystal monomer to polymerize into a polymer network under the action of ultraviolet light, the chiral dopant enables the negative liquid crystal to form cholesteric liquid crystal with a spiral structure, the cholesteric liquid crystal has a single screw pitch, the specific screw pitch structure reflects the wave band of infrared light with specific wavelength, the polymer network can capture impurity cations, when the light-transmitting substrate is electrified, the impurity cations move to the light-transmitting substrate electrically connected with the negative electrode of the power supply, and the polymer network drives the cholesteric liquid crystal to move, so that the pitch of the cholesteric liquid crystal is changed, and the infrared reflection bandwidth is widened from narrow to wide.
Description
Technical Field
The invention relates to an infrared reflection device, in particular to an infrared reflection device with tunable wave band and a preparation method thereof.
Background
Modern buildings create indoor environments for people to work, study and live, and the comfort level of the indoor environment is closely related to the life health of people. The buildings and automobiles widely adopt cooling or heating devices to keep the comfort of the environment, and meanwhile, the harm to human beings and the environment caused by the emission of harmful gases cannot be measured. With the change of climate and the continuous change of people's demand, the traditional mechanical heat insulation and refrigeration methods, such as: the shutter and the air conditioning equipment cannot achieve intelligent regulation and control along with the requirements of people and the change of climate.
Disclosure of Invention
The invention aims to provide an infrared reflecting device with tunable wave band and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
an infrared reflection device with a tunable waveband comprises a first light-transmitting substrate, a second light-transmitting substrate and a power supply assembly which are oppositely arranged, wherein the first light-transmitting substrate is electrically connected with the positive electrode of the power supply assembly, the second light-transmitting substrate is electrically connected with the negative electrode of the power supply assembly, a regulation area is formed between the first light-transmitting substrate and the second light-transmitting substrate in a packaging mode, a liquid crystal mixture is filled in the regulation area, the liquid crystal mixture comprises negative liquid crystal, chiral dopants, photoinitiators and a polymer network, the polymer network is a network-shaped polymer formed by polymerization of photopolymerizable liquid crystal monomers initiated by the photoinitiators, the negative liquid crystal is dispersed in the polymer network, and the negative liquid crystal is cholesteric liquid crystal with a single pitch under the condition that the first light-transmitting substrate and the second light-transmitting substrate are not electrified, the polymer network can capture impurity cations in the liquid crystal mixture, and the cations move towards the second light-transmitting substrate under the action of an electric field in the state that the first light-transmitting substrate and the second light-transmitting substrate are electrified to drive the polymer network to move towards the second light-transmitting substrate, so that the pitch of the cholesteric liquid crystal is changed.
In some specific embodiments, in a state where the first transparent substrate and the second transparent substrate are powered on, the cations move toward the second transparent substrate under the action of the electric field, and drive the polymer network to move toward the second transparent substrate, so that the pitch of the cholesteric liquid crystal near the first transparent substrate is increased, and the pitch of the cholesteric liquid crystal near the second transparent substrate is decreased.
In some specific embodiments, two of the light-transmitting substrates are provided with parallel alignment layers on opposite surfaces thereof.
In some embodiments, the photopolymerizable monomer is RM82 or RM 257.
In some embodiments, the negative liquid crystal is LC-2079 or BL 109.
In some specific embodiments, the chiral dopant is S811 or S1011.
In some embodiments, the photoinitiator is Irgacure-369 or Irgacure-651.
The invention also provides a preparation method of the infrared reflecting device with tunable wave band, which comprises the following steps:
s1: preparing a first light-transmitting substrate and a second light-transmitting substrate, wherein the first light-transmitting substrate and the second light-transmitting substrate are oppositely arranged;
s2: spin-coating an alignment layer on the opposite surfaces of the first light-transmitting substrate and the second light-transmitting substrate, and rubbing the alignment layer for orientation;
s3: preparing the first light-transmitting substrate and the second light-transmitting substrate into a liquid crystal box;
s4: weighing negative liquid crystal, chiral dopant, photopolymerisable liquid crystal monomer and photoinitiator, mixing, and heating to convert the liquid crystal into isotropic liquid state to obtain a liquid crystal mixture;
s5: injecting the liquid crystal mixture into the liquid crystal cell, wherein the chiral monomer and the chiral dopant enable the negative liquid crystal to form a cholesteric spiral structure;
s6: the first light-transmitting substrate is electrically connected with the positive electrode of the power supply assembly, and the second light-transmitting substrate is electrically connected with the negative electrode of the power supply assembly.
In some embodiments, the liquid crystal cell is irradiated with ultraviolet light, and the photoinitiator initiates polymerization of the photopolymerizable liquid crystal monomers to form a polymer network.
In some specific embodiments, the alignment layer is a parallel alignment layer.
In some specific embodiments, the mass ratio of the negative liquid crystal, the chiral dopant, the photopolymerizable liquid crystal monomer and the photoinitiator in the liquid crystal mixture is (80-90): (3-13): (5-15): (0.1-0.8).
The invention has the beneficial effects that:
the method comprises the steps of mixing a chiral dopant, a photopolymerisable liquid crystal monomer, a photoinitiator and negative liquid crystal to obtain a liquid crystal mixture, filling the liquid crystal mixture into two light-transmitting substrates which can be connected with voltage, initiating the photopolymerisable liquid crystal monomer to polymerize into a polymer network under the action of ultraviolet light by the photoinitiator, enabling the negative liquid crystal to form cholesteric liquid crystal with a spiral structure by the chiral dopant, wherein the cholesteric liquid crystal has a single pitch, and a specific pitch structure reflects the waveband of infrared light with a specific wavelength. Ester groups on the polymer network can capture impurity cations in the liquid crystal mixed material, under the state that the first light-transmitting substrate and the second light-transmitting substrate are electrified, the polymer network adsorbs the impurity cations in the mixed liquid crystal material to move towards the second light-transmitting substrate electrically connected with the negative electrode of the power supply under the action of an electric field, the polymer network near the negative electrode of the power supply drives the pitch of the cholesteric liquid crystal to be reduced, and the polymer network near the positive electrode of the power supply drives the pitch of the cholesteric liquid crystal to be increased, so that a certain pitch gradient is generated, and the infrared reflection bandwidth is widened from narrow to narrow. The pitch gradient can be regulated and controlled by regulating the voltage between the two light-transmitting conductive substrates, so that the infrared reflection bandwidth is regulated.
Drawings
Fig. 1 is a schematic cross-sectional view of a band-tunable infrared reflecting device.
Fig. 2 is a partial cross-sectional schematic view of a band-tunable infrared reflecting device in an unpowered state.
Fig. 3 is a partial cross-sectional schematic view of a band-tunable infrared reflecting device in an energized state.
Fig. 4 is a graph of infrared reflection spectra of a band-tunable infrared reflecting device at different voltages.
Detailed Description
Example 1:
referring to fig. 1, fig. 1 is a schematic cross-sectional view of an infrared reflection device with tunable wavelength band, and the present invention provides a power supply assembly 3 including a first transparent substrate 1 and a second transparent substrate 2 that are disposed opposite to each other, and is characterized in that the first transparent substrate 1 is electrically connected to an anode of the power supply assembly 3, the second transparent substrate 2 is electrically connected to a cathode of the power supply assembly 3, an adjustment region 4 is formed between the first transparent substrate 1 and the second transparent substrate 2 by packaging a package frame 6, the adjustment region 4 is filled with a liquid crystal mixture, a spacer 5 for supporting the thickness of the infrared reflection device is further disposed in the adjustment region 4, and the height of the spacer 5 is equal to the thickness of the adjustment region 4. Parallel alignment layers 7 are arranged on the opposite surfaces of the first light-transmitting substrate 1 and the second light-transmitting substrate 2.
Referring to fig. 2, fig. 2 is a schematic partial cross-sectional view of a band-tunable infrared reflection device in a non-energized state, the liquid crystal mixture includes a negative liquid crystal, a chiral dopant, a photoinitiator, and a polymer network 9, the polymer network 9 is a network polymer formed by polymerization of the photopolymerizable liquid crystal monomer initiated by the photoinitiator, in the non-energized state of the first transparent substrate 1 and the second transparent substrate 2, the negative liquid crystal is a cholesteric liquid crystal having a helical structure 10, the cholesteric liquid crystal has a single pitch, the liquid crystal mixture includes an impurity cation 11 and an impurity anion 8, and the polymer network 9 can capture the impurity cation 11 in the liquid crystal mixture.
Referring to fig. 3, fig. 3 is a schematic partial cross-sectional view of the band-tunable infrared reflection device in a powered state, and in the powered state of the first transparent substrate 1 and the second transparent substrate 2, the cations 11 move toward the second transparent substrate 2 under the action of an electric field to drive the polymer network 9 to move toward the second transparent substrate 2, so that the pitch of the cholesteric liquid crystal changes, the pitch of the cholesteric liquid crystal near the first transparent substrate 1 becomes larger, and the pitch of the cholesteric liquid crystal near the second transparent substrate 2 becomes smaller. According to the following formula: λ ═ P × n, where P denotes a pitch at which a director of the chiral nematic liquid crystal rotates by 2 pi in the helical axis direction, i.e., one pitch, λ is a cholesteric liquid crystal reflection wavelength of a single pitch, and n is an average light refractive index of the liquid crystal; Δ λ ═ (ne-no) × P ═ Δ nxp, where Δ λ is the reflection spectral bandwidth and Δ n is the birefringence; when the value of P is changed from a single value to a range, the reflected wavelength and the reflected bandwidth of the liquid crystal mixture are widened.
The infrared reflecting device with the tunable waveband is prepared by the following steps: preparing a first light-transmitting substrate and a second light-transmitting substrate, wherein the first light-transmitting substrate and the second light-transmitting substrate are oppositely arranged; spin-coating a parallel alignment layer on the opposite surfaces of the first and second light-transmitting substrates, and rubbing to orient; preparing the first light-transmitting substrate and the second light-transmitting substrate into a liquid crystal box; preparing a liquid crystal mixture, weighing 81.4 parts by mass of negative liquid crystal LC-2079, 12.6 parts by mass of chiral dopant S811, 5 parts by mass of photopolymerisable liquid crystal monomer RM82 and 1 part by mass of photoinitiator Irgacure-651, and mixing the negative liquid crystal LC-2079, the dielectric constant delta epsilon of which is-6.7, the birefringence delta n of which is 0.15, and the structural formula of the chiral dopant S811 is shown in the specification
The structural formula of the liquid crystal monomer RM82 is shown in the specification
The structural formula of the photoinitiator Irgacure-651 is shown in the specification
Then stirring for 5min at the temperature of 60 ℃ at 50r/s in a hot bench, and uniformly mixing to obtain a liquid crystal mixed material; heating the mixed liquid crystal material to 60 ℃ under the condition of yellow light to ensure that the liquid is dissolvedThe crystal mixed material is converted into a cholesteric liquid crystal mixture; injecting the liquid crystal mixture into the liquid crystal cell, wherein the chiral monomer and the chiral dopant enable the negative liquid crystal to form a cholesteric spiral structure; the first light-transmitting substrate is electrically connected with the positive electrode of the power supply assembly, and the second light-transmitting substrate is electrically connected with the negative electrode of the power supply assembly; and irradiating the liquid crystal box by using ultraviolet light, wherein the photoinitiator initiates the photopolymerizable liquid crystal monomer to polymerize to form a polymer network.
Example 2:
this embodiment is substantially the same as embodiment 1 except that: the photopolymerisable monomer is RM257 and has a structural formula
The negative liquid crystal is BL109, the dielectric constant delta epsilon of the negative liquid crystal is-6 to-14, the birefringence delta n of the negative liquid crystal is 0.1 to 0.15, the chiral dopant is S1011, and the structural formula of the chiral dopant is
The photoinitiator is Irgacure-369, and the structural formula is
Claims (8)
1. An infrared reflection device with tunable waveband comprises a first light-transmitting substrate, a second light-transmitting substrate and a power supply assembly which are oppositely arranged, and is characterized in that the first light-transmitting substrate is electrically connected with the positive pole of the power supply assembly, the second light-transmitting substrate is electrically connected with the negative pole of the power supply assembly, a regulation area is formed between the first light-transmitting substrate and the second light-transmitting substrate in a packaging mode, a liquid crystal mixture is filled in the regulation area, the liquid crystal mixture is composed of negative liquid crystal, chiral dopant, photoinitiator and polymer network, the polymer network is network polymer formed by polymerization of photopolymerisable liquid crystal monomers initiated by the photoinitiator, the negative liquid crystal is dispersed in the polymer network, and the negative liquid crystal is cholesteric liquid crystal with single screw pitch under the condition that the first light-transmitting substrate and the second light-transmitting substrate are not electrified, the polymer network can capture impurity cations in the liquid crystal mixture, under the state that the first light-transmitting substrate and the second light-transmitting substrate are electrified, the impurity cations move towards the second light-transmitting substrate under the action of an electric field to drive the polymer network to move towards the second light-transmitting substrate, the pitch of cholesteric liquid crystals close to the first light-transmitting substrate is increased, the pitch of cholesteric liquid crystals close to the second light-transmitting substrate is decreased, and the photopolymerisable liquid crystal monomer is RM82 or RM 257.
2. A band tunable infrared reflecting device according to claim 1, wherein said first transparent substrate and said second transparent substrate are provided with parallel alignment layers on opposite surfaces thereof.
3. A band tunable infrared reflecting device according to claim 1, wherein said negative liquid crystal is LC-2079 or BL 109.
4. A band tunable infrared reflecting device according to claim 1, wherein said chiral dopant is S811 or S1011.
5. A band tunable infrared reflecting device according to claim 1, wherein said photoinitiator is Irgacure-369 or Irgacure-651.
6. A preparation method of an infrared reflecting device with tunable wave band is characterized by comprising the following steps:
s1: preparing a first light-transmitting substrate and a second light-transmitting substrate, wherein the first light-transmitting substrate and the second light-transmitting substrate are oppositely arranged;
s2: spin-coating an alignment layer on the opposite surfaces of the first light-transmitting substrate and the second light-transmitting substrate, and rubbing the alignment layer for orientation;
s3: preparing the first light-transmitting substrate and the second light-transmitting substrate into a liquid crystal box;
s4: weighing negative liquid crystal, chiral dopant, photopolymerisable liquid crystal monomer and photoinitiator, mixing, and heating to convert the liquid crystal into isotropic liquid state to obtain a liquid crystal mixture;
s5: injecting the liquid crystal mixture into the liquid crystal cell, wherein the chiral dopant enables the negative liquid crystal to form a cholesteric helix structure;
s6: the first light-transmitting substrate is electrically connected with the positive electrode of the power supply assembly, and the second light-transmitting substrate is electrically connected with the negative electrode of the power supply assembly.
7. The method of claim 6, wherein the liquid crystal cell is irradiated with UV light, and the photoinitiator initiates polymerization of the photopolymerizable liquid crystal monomers to form a polymer network.
8. The method according to claim 6, wherein the alignment layer is a parallel alignment layer.
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| CN201611008519.XA CN106646985B (en) | 2016-11-16 | 2016-11-16 | Infrared reflecting device with tunable wave band and preparation method thereof |
| PCT/CN2017/109809 WO2018090858A1 (en) | 2016-11-16 | 2017-11-08 | Infrared reflection device with tunable wave band, and manufacturing method therefor |
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| CN106646985B (en) * | 2016-11-16 | 2021-06-22 | 深圳市国华光电科技有限公司 | Infrared reflecting device with tunable wave band and preparation method thereof |
| CN106997133A (en) * | 2017-05-17 | 2017-08-01 | 华南师范大学 | A kind of preparation method of infrared external reflection device |
| CN107272277A (en) * | 2017-06-15 | 2017-10-20 | 华南师范大学 | A kind of adjustable infrared external reflection device of reflection ratio |
| CN107346084B (en) * | 2017-07-21 | 2020-10-16 | 华南师范大学 | Total reflection infrared reflection device and preparation method thereof |
| CN108319059B (en) * | 2018-01-25 | 2020-01-07 | 华南师范大学 | Electric response infrared reflection device |
| CN108398825A (en) * | 2018-03-06 | 2018-08-14 | 合肥工业大学 | A kind of the liquid crystal light modulation device and its preparation process of tunable IR |
| CN108363237B (en) * | 2018-03-15 | 2021-03-05 | 京东方科技集团股份有限公司 | Reflecting film, preparation method thereof, reflecting assembly and display device |
| CN109001930B (en) * | 2018-07-13 | 2021-11-02 | 华南师范大学 | Electric response infrared reflection device and preparation method thereof |
| CN109143623B (en) * | 2018-08-27 | 2021-08-10 | 华南师范大学 | Infrared reflection device and preparation method thereof |
| CN110373016B (en) * | 2019-06-25 | 2021-03-19 | 东南大学 | Liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating network liquid crystal elastomer |
| CN112909719A (en) * | 2020-12-31 | 2021-06-04 | 华南师范大学 | Polymer stabilized liquid crystal laser and method and apparatus for making same |
| CN113311625A (en) * | 2021-03-16 | 2021-08-27 | 合肥工业大学 | Polymer stabilized cholesteric liquid crystal color-changing glass and preparation method and application thereof |
| CN113655653A (en) * | 2021-07-29 | 2021-11-16 | 华南师范大学 | Liquid crystal dimming device and preparation method and application thereof |
| CN113641015A (en) * | 2021-07-30 | 2021-11-12 | 华南师范大学 | Infrared reflector and preparation method and application thereof |
| CN113759612A (en) * | 2021-08-19 | 2021-12-07 | 华南师范大学 | Reflective optical filter based on cholesteric liquid crystal and preparation method and application thereof |
| CN114879399A (en) * | 2022-04-28 | 2022-08-09 | 合肥工业大学 | Polymer stabilized cholesteric liquid crystal color-changing glass and preparation method and application thereof |
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| KR101711144B1 (en) * | 2010-10-05 | 2017-03-02 | 삼성전자주식회사 | Cholesteric liquid crystal display device and method of manufacturing the same |
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| CN106646985B (en) * | 2016-11-16 | 2021-06-22 | 深圳市国华光电科技有限公司 | Infrared reflecting device with tunable wave band and preparation method thereof |
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| JP2002357815A (en) * | 2001-06-01 | 2002-12-13 | Japan Science & Technology Corp | Infrared light control element |
| CN105676489A (en) * | 2015-12-17 | 2016-06-15 | 深圳市国华光电科技有限公司 | Infrared reflection device based on electrical response |
| CN106019754A (en) * | 2016-06-14 | 2016-10-12 | 深圳市国华光电科技有限公司 | Thermal-response infrared total reflection device and preparing method thereof |
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