CN114839760A - Light valve and preparation method thereof - Google Patents
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- CN114839760A CN114839760A CN202210486924.1A CN202210486924A CN114839760A CN 114839760 A CN114839760 A CN 114839760A CN 202210486924 A CN202210486924 A CN 202210486924A CN 114839760 A CN114839760 A CN 114839760A
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
Abstract
The invention relates to the technical field of light valves, in particular to a light valve and a preparation method thereof. The invention provides a scheme for preparing the light valve by using bismuth oxyhalide nanosheets, particularly BiOF nanosheets and BiOBr nanosheets as suspended particles, develops the new application of the bismuth oxyhalide nanosheets and expands the optional range of the SPD light valve. The light valve and the suspended particle bismuth oxyhalide nanosheet thereof provided by the invention can be prepared by adopting a conventional method, have simple process and are suitable for production and popularization; the prepared light valve has stable performance and good environmental adaptability, the visible light transmittance is about 5 percent in a closed state, the visible light transmittance is 25 to 32 percent in an open state, and the effect of regulating the luminous flux is good.
Description
Technical Field
The invention relates to the technical field of light valves, in particular to a light valve and a preparation method thereof.
Background
A light valve is a device that can adjust the luminous flux, and the light valve has been studied for half a century. Light valves are generally classified into three categories, depending on the dimming principle: polymer Dispersed Liquid Crystals (PDLCs), electrochrome devices (ECs) and Suspended Particle Devices (SPDs), all of which are realized by sandwiching an electroactive component between two transparent electrodes. In the electrochemical color-changing device, through obtaining and losing electrons to change color, the electroactive component is a chemical substance which can generate oxidation-reduction reaction in an electromagnetic field applied by two transparent electrodes, namely, the electrochromic material obtains and loses electrons to change color; in the liquid crystal device, the electric active component is liquid crystal molecules, and the regulation and control of the luminous flux are realized by applying electromagnetic fields on two transparent electrodes to change the crystal structure; in the suspended particle device, the electroactive component is suspended particles, and the light flux is regulated and controlled by changing the motion orientation of the suspended particles through applying an electromagnetic field to two transparent electrodes so as to rearrange the suspended particles.
Among the various light valves, the suspended particle device is favored by more researchers due to its advantages of excellent weather resistance, rich color, high transparency controllability, and the like. Generally, SPD light valves are composed of two transparent electrodes and a light modulating layer sandwiched between the transparent electrodes, typically comprising an insulating liquid phase organic polymer, and suspended particles having internal dipole moments suspended in the polymer. When the external voltage is not switched on, the suspended particles do random Brownian motion, the integral light transmission is poor, and the light valve is in an opaque state; when external voltage is connected, the suspended particles are directionally arranged into a straight line along the direction of the electric field under the action of the external electric field, so that the incident light can partially or almost completely penetrate through the light valve, and the aim of dimming is fulfilled. The technology is applied to the wave sound 787 airplane windows, the high-grade automobile windows and the showcases of certain museums, and the technology is increasingly brought into the field of vision of the masses with further research on light valves at home and abroad.
However, the suspended particles currently applied to the SPD light valve are mainly nanorods, and the preparation technology of the suspended particles based on the shapes of the nanorods is relatively mature, but the types of materials are limited, and the synthesis technology of the suspended particle nanorods is monopolized by technologies of the united states, israel and other countries, so that some high and new technology enterprises in China take steps in the research and development process, and the commercial and civil processes of the light valve products in China are greatly limited. The most widely used suspended particles in the prior art are quinine iodosulfate (Herapathite) nanorods, the chemical formula of which is 4C 20 H 24 N 2 O 2 ·3H 2 SO 4 ·2HI·I 4 ·6H 2 And O. From the chemical composition, quinine iodosulfate is unstable in various organic and inorganic solvents, and has poor thermal stability due to the existence of iodine element. This not only causes difficulty in the fabrication of the suspended media in the SPD, but also greatly constrains the environmental tolerance of the SPD. Although scholars have attempted to improve the stability of suspended particles by substituting iodine elements with other halogens, the presence of organic components in the product has left this approach to solve the problem essentially.
Therefore, it is important for those skilled in the art to develop a new suspended particle application to obtain a more stable SPD light valve device.
Disclosure of Invention
In order to solve the problems, the invention provides a light valve and a preparation method thereof, and an SPD light valve with good stability is prepared by taking bismuth oxyhalide nanosheets with proper internal dipole moments as suspended particles.
The invention provides a light valve, which comprises two layers of transparent electrodes and a dimming layer sandwiched between the two layers of transparent electrodes, wherein the dimming layer comprises a suspension liquid, suspension particles of bismuth oxyhalide nanosheets are uniformly dispersed in the suspension liquid, the chemical formula of the bismuth oxyhalide is BiOX, and X is selected from at least one of F, Cl, Br and I.
Preferably, the bismuth oxyhalide is selected from one of BiOF and BiOBr.
The molecule is electrically neutral, but due to the difference of spatial configuration, the positive and negative charge centers may or may not coincide, the former is called non-polar molecule, the latter is called polar molecule, in physics, the product of the distance r between the positive and negative charge centers and the charge amount q charged by the charge center is called dipole moment μ ═ r × q, the size of the molecular polarity can be measured by dipole moment μ, and the larger the dipole moment, the larger the molecular polarity is. Bismuth oxyhalide is easy to crystallize into a tetragonal nanosheet under the condition of a liquid phase, and the nanosheet has a layered property, namely atoms are orderly arranged in a long-range (along an a/b axis) crystal plane to form a nanosheet laminate. Because the density difference of electron clouds between anions and cations in the bismuth oxyhalide nano-sheet is large, and atoms are stacked on a nano-sheet laminate in a long range, the material has stronger dipole moment in the a/b crystal direction. Under the action of an external electric field, the bismuth oxyhalide nanosheets are polarized, are overturned from random Brownian motion and are directionally arranged along the a/b axis (namely the nanosheet laminate is perpendicular to the electric field), so that visible light can pass through, and the purpose of regulating and controlling the throughput of the visible light is achieved.
In some of these embodiments, the bismuth oxyhalide nanosheets have a planar dimension of less than 4 μm and a thickness of less than 300 nm.
Preferably, the planar size of the bismuth oxyhalide nanosheets is less than 1 μm, and the thickness is less than 50 nm.
In some of these embodiments, the mass fraction of bismuth oxyhalide nanoplates in the suspension is 0.05-4.0%.
Preferably, the mass fraction of the bismuth oxyhalide nanosheets in the suspension is 0.1-2.0%.
There are many factors that affect the turning of suspended particles in an electric field, and since suspended particles in SPD light valves are solid particles, the coordination of the dipole size of the suspended particles themselves and the particle size is crucial. When the particle size is too large, the moment effect of the particles in an electric field is insufficient to support the particles to turn, so that the control on the luminous flux cannot be realized; when the particle size is too small, the required concentration of suspended particles can increase significantly based on the rate of change of the light valve on and off light flux and the requirement for the dark state of the light valve.
In a second aspect, the present invention further provides a method for manufacturing the light valve, including the following steps: uniformly mixing bismuth oxyhalide nanosheets and a suspension medium to obtain a suspension, adding spacing balls into the suspension, and then packaging the suspension mixed with the spacing balls between two layers of transparent electrodes to obtain the target device.
In some embodiments, the bismuth oxyhalide nanosheets are prepared using a wet chemical process, which is a hydrothermal process, a precipitation process, a microwave process, or an interfacial process. The bismuth oxyhalide nanosheet of the present invention may also be prepared by other wet chemical methods, which are not limiting of the present invention. In addition, when the bismuth oxyhalide nanosheet is prepared by a wet chemical method, the bismuth source thereof may be selected from at least one of hydrated or non-hydrated salts such as bismuth nitrate, bismuth chloride, bismuth sulfate and the like.
In some of these embodiments, the suspension medium is selected from at least one of a siloxane, an acrylic, an alkylene oxide based monomer, or a polymer.
Preferably, the suspension medium is an acrylic polymer.
In some of these embodiments, the viscosity of the suspension medium is less than 2000 cp.
The suspension medium can keep the suspension state of the suspended particles in the suspension liquid, and when the viscosity of the suspension medium is proper, the bismuth oxyhalide nanosheets can be uniformly distributed in the suspension liquid, so that the prepared light valve is uniform in light transmission, and the nanosheets can be freely turned over in the suspension liquid under the action of an electric field, and the dimming effect is realized; and when the viscosity of the suspension is too high, the turnover of the nanosheets is limited, so that the device cannot embody the dimming function.
In some of these embodiments, the spacer balls have a size of 10-200 μm.
In some of the embodiments, the transparent electrode is selected from at least one of an ITO conductive glass, an ITO conductive film, a nano Ag wire conductive film, a nano Cu wire conductive film, a PEDOT conductive film, a graphene conductive film, and a carbon nanotube conductive film.
In a third aspect, the invention further provides an application of the bismuth oxyhalide nanosheet in a light valve.
The inventor of the invention utilizes the nano-sheet with internal dipole moment as the suspended particle, and the nano-sheet is overturned to be parallel to the electric field line under the action of the electric field, thereby realizing the control of the visible light transmittance. In the invention, the bismuth oxyhalide nanosheet has excellent shading effect in the initial state of the device, and the mass fraction of the bismuth oxyhalide nanosheet in the suspension is only 0.1-2.0%, which is significantly less than at least 2-10% of the mass fraction of the bismuth oxyhalide nanosheet when the nanorod is used as suspended particles; meanwhile, the reduction of the content of the particles can effectively avoid the occurrence of agglomeration phenomenon, further ensure the uniformity of the particles dispersed in the suspension, and further ensure the uniformity of shading and light transmission of the device.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a scheme for preparing the light valve by using bismuth oxyhalide nanosheets, particularly BiOF nanosheets and BiOBr nanosheets as suspended particles, develops the new application of the bismuth oxyhalide nanosheets and expands the optional range of the SPD light valve. The light valve provided by the invention has the advantages that the visible light transmittance is about 5% in the closed state and 25-32% in the open state, and the effect of regulating the luminous flux is good.
(2) The bismuth oxyhalide nanosheets with internal dipole moments are overturned in an electric field for directional distribution, so that the visible light transmittance is controlled, before electrification, the bismuth oxyhalide nanosheets move irregularly and are randomly distributed in positions, the absorption and reflection of visible light are large, and the light valve light transmittance is low; after the power is switched on, the bismuth oxyhalide nanosheets are overturned and directionally arranged under the action of an electric field due to dipole moments of the bismuth oxyhalide nanosheets and are perpendicular to the electrodes, so that the light valve device is changed from a shading state to a light-passing state. Because the bismuth oxyhalide nanosheets are all inorganic materials, the physical and chemical properties are relatively stable, and the SPD light valve prepared by taking the bismuth oxyhalide nanosheets as suspended particles has stable performance and good environmental adaptability.
(3) The suspended particle bismuth oxyhalide nanosheet used in the invention can be prepared by a conventional wet chemical method, the limitations of reaction mode, reaction raw materials, reaction conditions and the like are small, and the source of the raw materials is expanded. Meanwhile, the light valve can be prepared by a conventional method, a light valve device with good performance is obtained by selecting proper size, mass fraction and viscosity of the suspension medium of the bismuth oxyhalide nanosheet, and the preparation process is simple and is suitable for production and popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a light valve according to the present invention;
FIG. 2 is an SEM representation of BiOF nanosheets in example 1 of the present inventors;
FIG. 3 is a graph showing the transmittance of a light valve based on BiOF nanosheets after applying a voltage of 200V to light with a wavelength of 200-800nm in example 1 of the present inventors;
fig. 4 is an SEM characterization of the BiOBr nanoplates of example 2 of the present inventors;
FIG. 5 is a graph showing the transmittance of a light valve based on BiOBr nanosheets after applying a voltage of 200V to light with a wavelength of 200-800nm in example 2 of the present inventors;
FIG. 6 is a graph showing the transmittance of a light valve based on BiOF nanosheets after a voltage of 200V is applied to the light valve in comparative example 1 of the present inventors for light with a wavelength of 200-800 nm;
FIG. 7 is a graph showing the transmittance of a light valve based on BiOF nanosheets after a voltage of 200V is applied to the light valve in comparative example 2 of the present inventors for light with a wavelength of 200-800 nm;
in the figure: 100. a light valve; 101. a transparent electrode; 102. a dimming layer; 103. a suspension; 104. a suspension medium; 105. bismuth oxyhalide nanosheet suspended particles.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 schematically presents a light valve 100 according to the present invention, wherein the light valve 100 comprises two transparent electrodes 101 and a dimming layer 102 sandwiched between the two transparent electrodes, the dimming layer 102 comprises a suspension 103, and the suspension 103 comprises a suspension medium 104 and bismuth oxyhalide nanosheet suspension particles 105 uniformly dispersed in the suspension medium 104. Under the condition of no external electric field, that is, the light valve 100 is in an off state, at this time, the bismuth oxyhalide nanosheet suspended particles 105 in the suspending medium 104 are in random positions due to random brownian motion, the light beam incident into the light valve 100 is absorbed/scattered, the overall light transmittance is poor, and the light valve is in an opaque state. When an electric field is applied to the light valve 100, that is, the light valve 100 is in an on state, at this time, the two-dimensional structure bismuth oxyhalide nanosheet suspended particles 105 in the dimming layer 102 are polarized under the action of the electric field, and are converted from random brownian motion into a state of being directionally arranged along the direction of electric field lines, so that the light beams can pass through the light valve 100 according to the arrangement of the electric field lines in the direction parallel to each other, and the light valve is relatively transparent. Therefore, the motion state of the bismuth oxyhalide nanosheet suspended particles is controlled through closing of the electric field, and the purpose of controlling luminous flux to adjust light is achieved.
More specifically, the chemical formula of the bismuth oxyhalide is BiOX, wherein X is selected from at least one of F, Cl, Br and I; preferably, the bismuth oxyhalide is selected from one of BiOF and BiOBr.
And the plane size of the bismuth oxyhalide nano-sheets is less than 4 μm, and the thickness of the bismuth oxyhalide nano-sheets is less than 300nm, and preferably, the plane size of the bismuth oxyhalide nano-sheets is less than 1 μm, and the thickness of the bismuth oxyhalide nano-sheets is less than 50 nm.
Further, the mass fraction of the bismuth oxyhalide nano-sheets in the suspension is 0.05-4.0%; preferably, the mass fraction of the bismuth oxyhalide nanosheets in the suspension is 0.1-2.0%.
Meanwhile, the selection of the bismuth source may include, but is not limited to, at least one of hydrated and/or non-hydrated salts of bismuth nitrate, bismuth chloride, bismuth sulfate, bismuth chlorate, and the like.
Meanwhile, the transparent electrode is selected from one of ITO conductive glass, an ITO conductive film, a nano Ag wire conductive film, a nano Cu wire conductive film, a PEDOT conductive film, a graphene conductive film and a carbon nano tube conductive film.
The present invention will now be described in more detail with reference to the following examples.
Example 1
1) Preparation of BiOF nanosheet
1mmol of hydrated bismuth nitrate (Bi (NO) 3 ) 3 ·5H 2 O) was dissolved in 60mL of ethylene glycol, and10mL of NH with a concentration of 0.1mol/L was slowly dropped thereto while stirring 4 F solution; adjusting the pH value of the obtained mixed solution to 10 by adopting NaOH, continuously stirring for 30min, transferring the obtained liquid into a hydrothermal kettle, and then placing the hydrothermal kettle in a constant-temperature drying box at 200 ℃ for reaction for 24 h; after the reaction liquid is cooled to room temperature, firstly, a product is obtained by centrifugal separation at a rotating speed of 1000r/min, then, the upper layer turbid liquid is taken to continue to be subjected to centrifugal separation at 5000r/min, and then, the product is dried to obtain the BiOF nanosheet, as shown in the attached figure 2.
SEM characterization results show that the plane size of the prepared BiOF nanosheet is below 3 μm, and the thickness is below 300 nm.
2) Preparation of suspensions containing BiOF nanoplates
In a 250ml two-necked flask, 24g of lauryl methacrylate, 0.6g of hydroxypropyl methacrylate and 30g of toluene were uniformly mixed, and 2g of hexanethiol was added to the resulting mixture; a10 g toluene solution containing 0.2g azobisisobutyronitrile was uniformly mixed with the organic mixture solution and the mixture solution was subjected to N 2 Carrying out polymerization reaction for 18h at 60 ℃ under the protection to obtain a suspension medium, wherein the viscosity of the suspension medium is 1600 cp; weighing 0.2g of BiOF nanosheet, mixing the BiOF nanosheet with 19.8g of the suspension medium, ultrasonically stirring the mixed suspension medium for 10min, centrifuging at the rotating speed of 2000r/min for 2min, removing particles which are not completely dispersed at the lower layer, and obtaining a suspension containing the BiOF nanosheet, wherein the mass fraction of the BiOF nanosheet in the suspension is 1.0%.
3) Preparation of light valve containing BiOF nanosheet
Adding spacing balls with the mass fraction of 3 per mill and the diameter of 100 mu m into the obtained suspension, and uniformly stirring; and then coating a proper amount of suspension mixed with the spacing balls between the two layers of ITO conductive films, and packaging the periphery of the conductive films by adopting insulating glue to obtain the simple SPD light valve.
As shown in FIG. 3, the light valve has a transmittance of only 6% in the "OFF" state for light in the wavelength range of 200-800nm, and the transmittance of the light valve is increased to about 25% in the "ON" state after a voltage of 200V is applied.
Example 2
1) Preparation of BiOBr nanosheet
2mmol of hydrated bismuth nitrate (Bi (NO) 3 ) 3 ·5H 2 O) was dissolved in 100mL of ethylene glycol to give a clear solution, which was then warmed to 160 ℃; adding 6mmol NaOH into the solution, stirring for 10min to obtain a light yellow suspension, and adding 2mmol tetrabutylammonium bromide powder into the suspension; and continuously stirring the obtained mixed solution at 160 ℃, slowly cooling to room temperature after the mixed solution reacts for 12 hours, then carrying out centrifugal separation, and then drying to obtain the BiOBr nano sheet as shown in the attached figure 4.
SEM characterization results show that the plane size of the prepared BiOBr nanosheet is below 2 μm, and the thickness is below 100 nm.
2) Preparation of a suspension containing BiOBr nanoplates
In a 250ml two-necked flask, 24.4g of lauryl methacrylate, 0.6g of hydroxypropyl methacrylate and 30g of toluene were uniformly mixed, and 3g of hexanethiol was added to the resulting mixture; a10 g toluene solution containing 4.0g azobisisobutyronitrile was uniformly mixed with the organic mixture solution and the mixture solution was subjected to N 2 Carrying out polymerization reaction for 12h at 60 ℃ under the protection to obtain a suspension medium, wherein the viscosity of the suspension medium is 1300 cp; weighing 0.1g of BiOBr nano sheet, mixing the BiOBr nano sheet in 19.9g of the suspension medium, ultrasonically stirring the mixed suspension medium for 10min, centrifuging for 2min at the rotating speed of 2000r/min, removing particles which are not completely dispersed at the lower layer, and obtaining a suspension containing the BiOBr nano sheet, wherein the mass fraction of the BiOBr nano sheet in the suspension is 0.5%.
3) Preparation of light valve containing BiOBr nanosheet
Adding 3 per mill of spacing balls with the diameter of 100 mu m into the obtained suspension, and uniformly stirring; and then coating a proper amount of suspension mixed with the spacing balls between the two layers of ITO conductive films, and packaging the periphery of the conductive films by adopting insulating glue to obtain the simple SPD light valve.
As shown in FIG. 5, the transmittance of the light valve in the "OFF" state is only 5% for light in the wavelength range of 200-800nm, and the transmittance of the light valve in the "ON" state is increased to about 32% after the voltage of 200V is applied.
Comparative example 1
This comparative example comprises most of the operating steps of example 1, with the difference that the mass fraction of the BiOF nanoplates in the suspension is different. The preparation method comprises the following steps:
1) preparation of BiOF nanosheet
1mmol of hydrated bismuth nitrate (Bi (NO) 3 ) 3 ·5H 2 O) was dissolved in 60mL of ethylene glycol, and 10mL of NH with a concentration of 0.1mol/L was slowly dropped thereto while stirring 4 F solution; adjusting the pH value of the obtained mixed solution to 10 by adopting NaOH, continuously stirring for 30min, transferring the obtained liquid into a hydrothermal kettle, and then placing the hydrothermal kettle in a constant-temperature drying box at 200 ℃ for reaction for 24 h; after the reaction liquid is cooled to room temperature, firstly, centrifuging at a rotating speed of 1000r/min to obtain a product, then, taking the upper layer turbid liquid, continuously performing centrifugal separation at 5000r/min, and then, drying to obtain the BiOF nanosheets as shown in the attached figure 2.
SEM characterization results show that the plane size of the prepared BiOF nanosheet is below 3 μm, and the thickness is below 300 nm.
2) Preparation of suspensions containing BiOF nanoplates
In a 250ml two-necked flask, 24g of lauryl methacrylate, 0.6g of hydroxypropyl methacrylate and 30g of toluene were uniformly mixed, and 2g of hexanethiol was added to the resulting mixture; a10 g toluene solution containing 0.2g azobisisobutyronitrile was uniformly mixed with the organic mixture solution and the mixture solution was subjected to N 2 Carrying out polymerization reaction for 18h at 60 ℃ under the protection to obtain a suspension medium, wherein the viscosity of the suspension medium is 1600 cp; weighing 1g of BiOF nanosheet, mixing the BiOF nanosheet with 19g of the suspension medium, ultrasonically stirring the mixed suspension medium for 10min, centrifuging at the rotating speed of 2000r/min for 2min, removing particles which are not completely dispersed at the lower layer, and obtaining a suspension containing the BiOF nanosheet, wherein the mass fraction of the BiOF nanosheet in the suspension is 5%.
3) Preparation of light valve containing BiOF nanosheet
Adding 3 per mill of spacing balls with the diameter of 100 mu m into the obtained suspension, and uniformly stirring; and then coating a proper amount of suspension mixed with the spacing balls between the two layers of ITO conductive films, and packaging the periphery of the conductive films by adopting insulating glue to obtain the simple SPD light valve.
As shown in FIG. 6, the transmittance of the light valve in the "OFF" state for light in the wavelength range of 200-800nm is 6%, and the transmittance of the light valve in the "ON" state is not significantly changed after the voltage of 200V is applied.
Comparative example 2
This comparative example comprises most of the operating steps of example 1, with the difference that the viscosity of the suspension medium is different. The preparation method comprises the following steps:
1) preparation of BiOF nanosheet
1mmol of hydrated bismuth nitrate (Bi (NO) 3 ) 3 ·5H 2 O) was dissolved in 60mL of ethylene glycol, and 10mL of NH with a concentration of 0.1mol/L was slowly dropped thereto while stirring 4 F solution; adjusting the pH value of the obtained mixed solution to 10 by adopting NaOH, continuously stirring for 30min, transferring the obtained liquid into a hydrothermal kettle, and then placing the hydrothermal kettle in a constant-temperature drying box at 200 ℃ for reaction for 24 h; after the reaction liquid is cooled to room temperature, firstly, a product is obtained by centrifugal separation at a rotating speed of 1000r/min, then, the upper layer turbid liquid is taken to continue to be subjected to centrifugal separation at 5000r/min, and then, the product is dried to obtain the BiOF nanosheet, as shown in the attached figure 2.
SEM characterization results show that the plane size of the prepared BiOF nanosheet is below 3 μm, and the thickness is below 300 nm.
2) Preparation of suspensions containing BiOF nanosheets
In a 250ml two-necked flask, 24g of lauryl methacrylate, 0.6g of hydroxypropyl methacrylate and 30g of toluene were uniformly mixed, and 0.5g of hexanethiol was added to the resulting mixture; a10 g toluene solution containing 0.2g azobisisobutyronitrile was uniformly mixed with the organic mixture solution and the mixture solution was subjected to N 2 Carrying out polymerization reaction for 18h at 60 ℃ under the protection to obtain a suspension medium, wherein the viscosity of the suspension medium is 2500 cp; weighing 0.2g of BiOF nanosheet, mixing the BiOF nanosheet with 19.8g of the suspension medium, ultrasonically stirring the mixed suspension medium for 10min, centrifuging at the rotating speed of 2000r/min for 2min, removing particles which are not completely dispersed at the lower layer, and obtaining a suspension containing the BiOF nanosheet, wherein the mass fraction of the BiOF nanosheet in the suspension is 1%.
3) Preparation of light valve containing BiOF nanosheet
Adding 3 per mill of spacing balls with the diameter of 100 mu m into the obtained suspension, and uniformly stirring; and then coating a proper amount of suspension mixed with the spacing balls between the two layers of ITO conductive films, and packaging the periphery of the conductive films by adopting insulating glue to obtain the simple SPD light valve.
As shown in FIG. 7, the transmittance of the light valve in the "OFF" state for light in the wavelength range of 200-800nm is only 6%, and the transmittance of the light valve in the "ON" state is only increased to 8% after the voltage of 200V is applied.
Embodiments 1 to 2 are light valves prepared by respectively using a BiOF nanosheet and a BiOBr nanosheet as suspended particles, and the light valves have a visible light transmittance of 5% in a closed state and 25 to 32% in an open state, and have good effects of adjusting luminous flux. The light valve devices manufactured in comparative examples 1 and 2 have small changes in visible light transmittance in the closed state and the open state, and are poor in light flux adjusting effect. The suspension liquid of the comparative example 1 is high in BiOF nanosheet mass fraction, on one hand, raw material waste is caused, on the other hand, the concentration of the BiOF nanosheets is too high, turning is not facilitated after electrification, and meanwhile, the nanosheets are tightly arranged and are not conducive to transmission of visible light; the suspension medium in the suspension liquid of the comparative example 2 has high viscosity, which is also not beneficial to the overturning of the suspension particles of the nano-sheets, and simultaneously, the problem of uneven distribution of the BiOF nano-sheets in the suspension medium can be caused, and the light transmission uniformity of the light valve can be influenced.
In conclusion, the light valve provided by the invention has the advantages that the visible light transmittance is about 5% in the closed state and 25-32% in the open state, the effect of adjusting the luminous flux is good, the new application of the bismuth oxyhalide nanosheet is developed, the optional range of the SPD light valve is expanded, and the light valve has good popularization and application values.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. A light valve is characterized by comprising two layers of transparent electrodes and a dimming layer sandwiched between the two layers of transparent electrodes, wherein the dimming layer comprises a suspension liquid, and suspension particles of bismuth oxyhalide nanosheets are uniformly dispersed in the suspension liquid.
2. A light valve as recited in claim 1, wherein the bismuth oxyhalide nanoplates have a planar dimension of less than 4 μm and a thickness of less than 300 nm.
3. A light valve as claimed in claim 1, wherein the suspension comprises bismuth oxyhalide nanoplates in a mass fraction of 0.05-4.0%.
4. A method of manufacturing a light valve as claimed in any one of claims 1 to 3, comprising the steps of: uniformly mixing bismuth oxyhalide nanosheets and a suspension medium to obtain a suspension, adding spacing balls into the suspension, and then packaging the suspension mixed with the spacing balls between two layers of transparent electrodes to obtain the target device.
5. The method for preparing a light valve as claimed in claim 4, wherein the bismuth oxyhalide nanosheet is prepared by a wet chemical method, and the wet chemical method is a hydrothermal method, a precipitation method, a microwave method or an interfacial method.
6. The method of claim 4, wherein the suspension medium is at least one selected from the group consisting of silicone, acrylic, alkylene oxide based monomers and polymers.
7. A method for manufacturing a light valve as claimed in claim 6, wherein the suspending medium has a viscosity of less than 2000 cp.
8. The method of claim 4, wherein the spacer balls have a size of 10-200 μm.
9. The method of claim 4, wherein the transparent electrode is at least one selected from the group consisting of ITO conductive glass, ITO conductive film, Ag nanowire conductive film, Cu nanowire conductive film, PEDOT conductive film, graphene conductive film, and carbon nanotube conductive film.
10. Use of bismuth oxyhalide nanosheets in light valves.
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| CN115356882A (en) * | 2022-10-21 | 2022-11-18 | 合肥精卓光电有限责任公司 | Light valve device and preparation method thereof |
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