CN109337673B - Vanadium dioxide-based fluorescent composite material and application thereof - Google Patents
Vanadium dioxide-based fluorescent composite material and application thereof Download PDFInfo
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- CN109337673B CN109337673B CN201811339331.2A CN201811339331A CN109337673B CN 109337673 B CN109337673 B CN 109337673B CN 201811339331 A CN201811339331 A CN 201811339331A CN 109337673 B CN109337673 B CN 109337673B
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Abstract
The invention relates to a vanadium dioxide-based fluorescent composite material and application thereof, wherein the vanadium dioxide-based fluorescent composite material comprises a vanadium dioxide-based thermochromic material and a fluorescent material capable of absorbing ultraviolet rays and emitting blue light, and the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material capable of absorbing ultraviolet rays and emitting blue light is 1 (0.1-10), and preferably 2: 1-1: 2.
Description
Technical Field
The invention relates to a vanadium dioxide-based fluorescent composite material and application thereof, in particular to light transmittance and color of a vanadium dioxide-based thermochromic material film, and belongs to the technical field of film light transmittance and color adjustment.
Background
The global energy shortage problem is increasingly serious, the environment is increasingly worsened due to excessive carbon emission, and energy conservation and emission reduction become the primary tasks of all countries at present. The building energy consumption is estimated to be more than 1/3 of the total social energy consumption, so that the promotion of building energy conservation is one of key measures for energy conservation, emission reduction and sustainable development realization. Most of building energy consumption is used for air conditioning, and the glass window is used as a main channel for heat exchange between the building and the outside and becomes a main way for air conditioning energy loss. Therefore, various types of energy-saving windows are used, the energy consumption can be effectively reduced, and the purposes of energy conservation and environmental protection are achieved.
The mainstream products of the energy-saving window in the existing market are Low-emissivity (Low-E) glass, heat-reflecting glass and the like, and the energy-saving window is widely applied to building energy conservation due to mature technology, Low price and good heat-insulating property. However, the optical performance of the energy-saving window cannot be changed due to seasonal changes and artificial requirements, and the energy-saving window is difficult to adapt to the energy-saving requirements of most of the winter-cold and summer-hot areas in China and the requirements of people on higher and higher comfort degree of living environment. Therefore, a new energy-saving product called an intelligent energy-saving window is produced at the same time, and becomes a new generation of energy-saving glass product following Low-E.
The intelligent energy-saving window uses the photochromic material with variable optical performance, and achieves the purpose of controllable regulation of indoor environment photo-thermal by utilizing the change of the photochromic material to the transflection performance and the like generated by various physical stimuli. Obviously, the intelligent energy-saving window can meet the requirements of most of areas and different climatic conditions, and the indoor living environment is more suitable for people. According to the physical stimulation type and the color changing mechanism, the intelligent energy-saving window has multiple types of intelligent energy-saving windows such as electrochromism, gasochromism, photochromism, thermochromism and the like. Among various types of intelligent energy-saving windows, the thermochromic energy-saving window developed by utilizing the semiconductor-metal reversible phase change principle near the room temperature of vanadium dioxide has the remarkable advantages of simple structure, small material consumption, capability of following the change of environmental temperature without switch or artificial energy control to realize automatic photo-thermal regulation and the like, and is paid attention to and developed in succession in various countries. The temperature-control intelligent energy-saving film pasting technology using the nano vanadium dioxide is a breakthrough in China at first, and the prepared vanadium dioxide-based temperature-control intelligent energy-saving film pasting is about to be put on the market. However, as the main inventors of the above technology, the following drawbacks of the vanadium dioxide temperature-controlled intelligent energy-saving window are still noticed: (1) the solar radiation infrared band has higher adjusting amplitude, but has almost no adjusting effect on the visible light band which accounts for 50% of the total solar radiation energy, and the total solar radiation adjusting rate is reduced as a result; (2) because the visible light wave band has no obvious regulation function, enough visual change can not be generated by utilizing the regulation, so that the strong regulation effect demonstration of customers can not be facilitated, and the decisive adverse effect is caused on the propaganda and popularization of products; (3) has strong absorption effect on short-wave-band visible light, and leads the film to develop yellow color. No mature technology has been known to date to fundamentally solve several of the above problems.
Patent 1 (chinese publication No. CN106443854A) discloses a quantum dot film including a silicon dioxide layer, a vanadium dioxide layer, and a quantum dot layer, which has an effect of absorbing blue light on the one hand and an effect of reflecting blue light on the other hand through interaction between electrons. The quantum dot layer is prepared by adopting an electrostatic adsorption method, the vanadium dioxide layer is prepared by adopting a vacuum evaporation method, the film layer prepared by electrostatic adsorption has weak bonding force, the vacuum evaporation cost is high, and the industrial production is difficult. Moreover, the quantum dots used in the method absorb blue light and emit visible light of other colors, which also has a certain adverse effect on the screen view effect.
Disclosure of Invention
Aiming at the problems, the invention adopts the fluorescent material and the vanadium dioxide-based thermochromic material to form the composite material for the first time, and provides the vanadium dioxide-based fluorescent composite film and the preparation method thereof.
In a first aspect, the invention provides a vanadium dioxide-based fluorescent composite material, which comprises a vanadium dioxide-based thermochromic material and a fluorescent material capable of absorbing ultraviolet rays and emitting blue light, wherein the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material capable of absorbing ultraviolet rays and emitting blue light is 1 (0.1-10), and preferably 2: 1-1: 2.
According to the invention, ultraviolet light in sunlight is utilized to excite the fluorescent material to emit blue light (wherein the absorption of ultraviolet light and the emission of blue light are limited and explained on the particle size of the fluorescent material), on one hand, the absorption of the vanadium dioxide-based thermochromic material in a blue light region is supplemented, the color compensation of the vanadium dioxide-based base film is realized, the visible light transmittance of the vanadium dioxide-based base film is improved, on the other hand, the ultraviolet light is blocked (absorbed), and the ultraviolet resistance of the vanadium dioxide-based base film is improved. If the content of the vanadium dioxide-based thermochromic material is low, the energy regulation rate of the obtained composite membrane in an infrared region is too low, and the composite membrane is inconvenient to use; if the content of the fluorescent material absorbing ultraviolet rays and emitting blue light is low, the light-emitting effect is not obvious, the complementary color cannot be achieved, and the ultraviolet ray blocking effect is not obvious.
Preferably, the vanadium dioxide-based thermochromic material is vanadium dioxide, preferably rutile phase vanadium dioxide or/and monoclinic phase vanadium dioxide; the particle size of the vanadium dioxide-based thermochromic material is 10 nm-10 mu m, and preferably 20-80 nm.
Preferably, the fluorescent material absorbing ultraviolet light and emitting blue light is at least one of fluorescent brightener OB, quantum dots and quantum dots with a core-shell structure, preferably at least one of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgTe, GaN, GaAs, InP, InAs, CdSe @ ZnS core-shell quantum dots (core-shell quantum dots formed by coating ZnS with CdSe).
In a second aspect, the invention provides a vanadium dioxide-based fluorescent composite film, which is an organic polymer composite film formed by the vanadium dioxide-based fluorescent composite material.
Preferably, the mass ratio of the vanadium dioxide-based thermochromic material to the organic polymer is 1: (1 to 100), preferably 1: (3-50).
Preferably, the thickness of the vanadium dioxide-based fluorescent composite film is 1-200 μm.
Preferably, the organic polymer is at least one of a carbon chain polymer, a heterochain polymer and an element organic polymer, and is preferably at least one of a polycrystalline resin, a silicone resin, a polyacrylic acid resin, a polyethylene glycol resin, a polyvinyl butyral resin and a polyvinyl alcohol resin.
In a third aspect, the present invention also provides a vanadium dioxide-based fluorescent composite film, which comprises an organic polymer film containing a vanadium dioxide-based thermochromic material and an organic polymer film containing a fluorescent material (fluorescent material) that absorbs ultraviolet light and emits blue light, which are sequentially formed on a surface of a substrate.
The layered structure in the invention is the interface of the organic polymer resin, and the vanadium dioxide material and the fluorescent material on the interface do not have good contact, so that the interaction (or very weak) between electrons can not be generated. The vanadium dioxide-based thermochromic material and the fluorescent material have the capacity of absorbing ultraviolet rays, and are in a competitive relationship, so that sunlight can pass through the fluorescent material firstly to be converted into blue light, and only a very small amount (less than 1%) of ultraviolet rays can reach the vanadium dioxide film layer, so that the fluorescent complementary color effect and the ultraviolet protection effect are more obvious, and the light transmittance of the film is greatly improved.
Preferably, the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material which absorbs ultraviolet rays and emits blue light is 1 (0.1-10), and preferably 2: 1-1: 2.
Preferably, the mass ratio of the vanadium oxide-based thermochromic material to the organic polymer in the organic polymer film containing the vanadium dioxide-based thermochromic material is 1: (1 to 100), preferably 1: (3-50); the mass ratio of the fluorescent material to the organic polymer in the organic polymer film containing the fluorescent material capable of absorbing ultraviolet rays and emitting blue light is 1: (1 to 100), preferably 1: (2-10).
Preferably, the thickness of the organic polymer film containing the vanadium dioxide-based thermochromic material or the organic polymer film containing the fluorescent material absorbing ultraviolet rays and emitting blue light is 1-100 μm.
Preferably, the organic polymer is at least one of a carbon chain polymer, a heterochain polymer and an element organic polymer, and is preferably at least one of a polycrystalline resin, a silicone resin, a polyacrylic acid resin, a polyethylene glycol resin, a polyvinyl butyral resin and a polyvinyl alcohol resin.
Preferably, the vanadium dioxide-based thermochromic material is vanadium dioxide; preferably, the vanadium dioxide is rutile phase or/and monoclinic phase vanadium dioxide.
Preferably, the particle size of the vanadium dioxide-based thermochromic material is 10 nm-10 μm, and preferably 20-80 nm.
Preferably, the fluorescent material absorbing ultraviolet light and emitting blue light is at least one of fluorescent brightener OB, quantum dots and quantum dots with a core-shell structure, preferably at least one of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgTe, GaN, GaAs, InP, InAs and CdSe @ ZnS core-shell quantum dots.
Preferably, the organic polymer is at least one of a carbon chain polymer, a heterochain polymer and an element organic polymer, and is preferably at least one of a polycrystalline resin, a silicone resin, a polyacrylic acid resin, a polyethylene glycol resin, a polyvinyl butyral resin and a polyvinyl alcohol resin.
In a fourth aspect, the present invention also provides a preparation method of the vanadium dioxide-based fluorescent composite film (single-layer composite film) according to the above, including:
uniformly dispersing the vanadium dioxide-based fluorescent composite material in a solvent to obtain a mixed dispersion liquid;
adding an organic polymer to the obtained mixed dispersion to obtain slurry;
and coating the obtained slurry on the surface of the substrate, and curing to obtain the vanadium dioxide-based fluorescent composite film.
Preferably, the solvent is at least one of toluene, xylene, ethanol and acetone; the concentration of the mixed dispersion liquid is 0.1-10 wt%.
In a fifth aspect, the present invention also provides a method for preparing the vanadium dioxide-based fluorescent composite film (layered composite film) according to the above, comprising:
respectively and uniformly dispersing a vanadium dioxide-based thermochromic material and a fluorescent material which absorbs ultraviolet rays and emits blue light into a solvent to obtain a mixed dispersion liquid 1 and a mixed dispersion liquid 2;
adding an organic polymer into the obtained mixed dispersion liquid 1 and the mixed dispersion liquid 2 respectively to obtain slurry and slurry 2;
coating the obtained slurry 1 on the surface of a substrate, and curing to obtain a vanadium dioxide-based thermochromic material layer;
and coating the slurry 2 on the surface of the obtained vanadium dioxide-based thermochromism material layer, and then carrying out secondary curing to obtain the vanadium dioxide-based fluorescent composite film.
Preferably, the solvent is at least one of toluene, xylene, ethanol and acetone; the concentration of the mixed dispersion liquid 1 and the mixed dispersion liquid 2 is 0.1-10 wt%.
The invention has the beneficial effects that:
(1) according to the invention, the fluorescent material which absorbs ultraviolet light and emits blue light is adopted to supplement the absorption of the vanadium dioxide-based thermochromic material in a blue light region, so that the light transmittance of the film is increased;
(2) the ultraviolet photochromic material can absorb ultraviolet rays, so that the ultraviolet rays which are unfavorable to vanadium dioxide-based thermochromic absorption are reduced or even avoided, and the stability of ultraviolet irradiation resistance of the ultraviolet photochromic material is improved;
(3) the preparation method is simple, is easy for mass production, can be used in the aspects of thermochromic intelligent energy-saving films for buildings and vehicles, intelligent energy-saving windows and the like, and realizes a leap breakthrough on the application technology of the vanadium dioxide-based thermochromic energy-saving windows.
Drawings
FIG. 1 is a schematic structural view of a multi-layered composite membrane prepared in example 1;
FIG. 2 is a schematic structural view of a vanadium dioxide-based fluorescent composite film prepared in example 2;
FIG. 3 is a fluorescence spectrum of OB fluorescent whitening agent under 365nm excitation;
FIG. 4 is a transmission spectrum at room temperature of the vanadium dioxide-based fluorescent composite film prepared in example 1;
fig. 5 is a transmission spectrum at room temperature of the vanadium dioxide-based thermochromic film prepared in comparative example 1;
fig. 6 is a transmission spectrum at room temperature of the film containing the ultraviolet-absorbing blue-emitting fluorescent material prepared in comparative example 2.
Detailed Description
The present invention is further illustrated by the following examples, which are to be understood as merely illustrative and not restrictive.
In the disclosure, a vanadium dioxide-based thermochromic material (for example, vanadium dioxide nanoparticles) and a fluorescent material absorbing ultraviolet rays and emitting blue light are adopted to prepare a vanadium dioxide-based fluorescent composite material (wherein the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material absorbing ultraviolet rays and emitting blue light is 1 (0.1-10), preferably 2: 1-1: 2), and the vanadium dioxide-based fluorescent composite film is prepared. The fluorescent material supplements the absorption of the vanadium dioxide-based thermochromism in a blue light region, so that the complementary color of the vanadium dioxide-based film is realized, and the requirement of consumers on the film color is met. And the fluorescent material can also improve the light transmittance of the vanadium dioxide-based thermochromic film and adjust the color of the vanadium dioxide-based thermochromic film.
In one embodiment of the present invention, the vanadium dioxide-based fluorescent composite film is an organic polymer composite film comprising a vanadium dioxide-based thermochromic material and a fluorescent material that absorbs ultraviolet rays and emits blue light, and the thermochromic thereof is reversibly performed at about 40 ℃. The color of the vanadium dioxide-based fluorescent composite film is complemented by a fluorescent material which absorbs ultraviolet light and emits blue light.
In an alternative embodiment, the mass ratio of the vanadium dioxide-based thermochromic material to the organic polymer can be 1:100 to 1:1, and preferably 1:50 to 1: 3.
In another embodiment of the invention, the organic polymer uniform dispersion system containing vanadium dioxide solid phase nano particles and the organic polymer containing the fluorescent material absorbing ultraviolet emission blue light form a composite film, and the thermochromism of the composite film is reversibly performed at about 40 ℃. The color of the vanadium dioxide-based fluorescent composite film is complemented by a fluorescent material which absorbs ultraviolet light and emits blue light.
In the disclosure, the vanadium dioxide-based thermochromic material and the fluorescent material absorbing ultraviolet emission blue light form an organic polymer composite film, and the mass ratio of the vanadium dioxide particles to the fluorescent powder can be 1: 0.1-1: 10, preferably 2: 1-1: 2, regardless of whether the composite form is a single-layer composite film or a multi-layer composite film formed by directly mixing the two or a vanadium dioxide-based fluorescent composite material.
In the present disclosure, the vanadium dioxide particles are in the doped and/or undoped rutile phase (space group P4)2At mm) and/or monoclinic phase (space group P2)1V) vanadium dioxide, and vanadium dioxide particles with or without a coating. Wherein the particle size range of the vanadium dioxide particles can be 10 nm-10 μm, and preferably 20-80 nm.
In an optional embodiment, the thickness of the cured film layer can be 1-200 μm when the vanadium dioxide-based thermochromic material and the fluorescent material absorbing ultraviolet-emitted blue light are directly mixed. The thickness of each film layer after curing can be 1-100 mu m when the vanadium dioxide-based thermochromic material and the fluorescent material absorbing ultraviolet emission blue light are respectively prepared and compounded into the film layers.
In an alternative embodiment, the fluorescent material that absorbs blue light from ultraviolet emission is a fluorescent whitening agent (b
OB), quantum dots (e.g., ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgTe, GaN, GaAs, InP, InAs, etc.), quantum dots having a core-shell structure (a core-shell structure composed of at least two of the above quantum dots), preferably an optical brightener OB (OB optical brightener, whose formula C is26H26N2O2S) or CdSe @ ZnS core-shell quantum dots. The organic polymer material has certain film forming property and certain bonding strength after curing, and is at least one of carbon chain polymer, heterochain polymer and element organic polymer.
In the invention, the fluorescent material (fluorescent material) absorbing ultraviolet and emitting blue light can absorb ultraviolet harmful to the vanadium dioxide basal membrane, can enhance the photochemical stability of the material, and has low preparation cost, simplicity, reliability and easy realization of large-scale production. The method for preparing the vanadium dioxide-based fluorescent composite film is exemplarily described below.
The vanadium dioxide-based thermochromic material and the fluorescent material are uniformly dispersed in the organic polymer to form stable slurry. And then coating the prepared slurry on the surface of a substrate (such as glass, PET, PMMA polyester and other light-transmitting objects), and curing to form the organic polymer composite film emitting blue light under ultraviolet irradiation. Wherein, the slurry also comprises a solvent which can be at least one of toluene, xylene, ethanol and acetone.
Or, the vanadium dioxide-based thermochromic material and the fluorescent material are uniformly dispersed in the organic polymer to form the stable slurry 1 and the slurry 2, respectively. And then coating the prepared slurry 1 on the surface of the substrate, curing the slurry, coating the slurry 2, and performing secondary curing to finally form the organic polymer composite film emitting blue light under ultraviolet irradiation. Wherein, the slurry 1 and the slurry 2 also comprise a solvent, and the solvent can be at least one of toluene, xylene, ethanol and acetone.
The present invention will be described in detail by way of examples. It is also to be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention, and that certain insubstantial modifications and adaptations of the invention by those skilled in the art may be made in light of the above teachings. The specific process parameters and the like of the following examples are also only one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below. In the following examples, unless otherwise specified, the particle size of the vanadium dioxide particles is 30 to 60 nm; OB fluorescent whitening agent is fluorescent whitening agent
OB。
Example 1
0.1g of vanadium dioxide particles are weighed and ultrasonically dispersed in 2g of ethanol to form 5 wt% of dispersion liquid, 4g of silicon resin is added into the dispersion liquid, the uniform slurry is formed by magnetic stirring, the uniform slurry is coated on a substrate (glass and the like) by adopting a blade coating mode, the substrate is placed for 2h at room temperature for curing (or placed in an oven to be heated and accelerate the curing), and the vanadium dioxide-based thermochromic film is obtained, the thickness of the film is 80 mu m, and the film is yellow.
OB fluorescent whitening agent is dissolved in toluene to form 5 wt% solution, 2g of the dispersion is taken, 2.5g of polycrystalline resin and 1g of silicon resin are added into the dispersion, uniform slurry is formed by magnetic stirring, the uniform slurry is coated on a vanadium dioxide-based thermochromic film prepared in advance in a blade mode, and the film (the total thickness is 200 mu m) can emit blue light under the irradiation of sunlight after the uniform slurry is solidified.
Example 2
Adding vanadium dioxide particles and quantum dots CdSe @ ZnS ═ 1:1 in a mass ratio into a ball mill, using toluene as a solvent and matching with a proper dispersant to obtain a mixed dispersion liquid of the vanadium dioxide particles and photosensitive powder, wherein the concentration of the mixed dispersion liquid is 5 wt%, then taking 2g of the dispersion liquid, adding 4g of silicon resin into the dispersion liquid, forming uniform slurry through magnetic stirring, coating the uniform slurry on a substrate in a blade coating mode, and curing the uniform slurry to obtain the vanadium dioxide-based fluorescent composite film with the thickness of 120 mu m.
Example 3
A vanadium dioxide-based thermochromic film was prepared as in example 1, having a thickness of 80 μm;
the quantum dot powder CdSe @ ZnS is ball-milled by using toluene as a solvent to form 5 wt% of dispersion liquid, 0.5 g of dispersion liquid, 1g of dispersion liquid, 3 g of dispersion liquid and 4g of dispersion liquid are respectively taken, 2.5g of polycrystalline resin and 1g of silicon resin are added into the dispersion liquid, the mixture is magnetically stirred to form uniform slurry, and the uniform slurry is blade-coated on a vanadium dioxide-based thermochromic film prepared in advance to obtain a film with adjustable luminous brightness (the total thickness is 200 mu m).
Example 4
A vanadium dioxide-based thermochromic film was prepared as in example 1, having a thickness of 80 μm;
OB fluorescent whitening agent is dissolved in toluene to form 5 wt% solution, 0.5 g, 1g, 3 g and 4g of dispersion liquid are respectively taken, 2.5g of polycrystalline resin and 1g of silicon resin are added into the dispersion liquid, uniform slurry is formed by magnetic stirring, and the uniform slurry is blade-coated on a vanadium dioxide-based thermochromic film prepared in advance to obtain the film with adjustable luminous brightness (the total thickness is 200 mu m).
Example 5
Adding vanadium dioxide particles and OB fluorescent whitening agent into a ball mill according to the mass ratio of 1:1, adding toluene as a solvent with a proper dispersant to obtain mixed dispersion liquid containing the vanadium dioxide-based fluorescent composite material, wherein the concentration of the mixed dispersion liquid is 5 wt%, then taking 2g of the dispersion liquid, adding 4g of silicon resin into the dispersion liquid, forming uniform slurry through magnetic stirring, coating the uniform slurry on a substrate in a blade coating mode, and curing the uniform slurry to obtain the vanadium dioxide-based fluorescent composite film with the thickness of 120 mu m.
Comparative example 1
A vanadium dioxide-based thermochromic film was prepared as in example 1, and had a visible light transmittance of 74.4% (see FIG. 5) and a thickness of 80 μm.
Comparative example 2
OB fluorescent whitening agent is dissolved in toluene to form 5 wt% solution, 2g of the dispersion is taken, 2.5g of polycrystalline resin and 1g of silicone resin are added into the dispersion, the mixture is magnetically stirred to form uniform slurry, and the uniform slurry is blade-coated on a substrate to obtain a film containing the fluorescent material which absorbs ultraviolet light and emits blue light, wherein the transmittance of the film in the ultraviolet region corresponding to the spectrum is close to 0, and the transmittance of the blue region is more than 100%, as shown in FIG. 6.
FIG. 3 is a fluorescence spectrum of OB fluorescent whitening agent under 365nm excitation, from which it can be seen that the fluorescence generation peak is located between 400 and 600nm, the strongest peak is located at 440nm, and is just in the blue region;
fig. 4 is a transmission spectrum of the vanadium dioxide-based fluorescent composite film prepared in example 1 at room temperature, and it can be seen that the visible light transmittance of the vanadium dioxide-based thermochromic film covered with an OB fluorescent whitening agent film is increased from 74.4% to 80.8%.
The above examples are only for further illustration of the present invention and should not be construed as limiting the scope of the present invention, and the non-essential modifications and adaptations of the present invention by those skilled in the art based on the foregoing descriptions are within the scope of the present invention.
Claims (8)
1. A vanadium dioxide-based fluorescent composite film is characterized by comprising an organic polymer film containing a vanadium dioxide-based thermochromic material and an organic polymer film containing a fluorescent material which absorbs ultraviolet rays and emits blue light, which are sequentially formed on the surface of a substrate; the fluorescent material for absorbing ultraviolet rays and emitting blue light is a fluorescent whitening agent OB; the mass ratio of the vanadium dioxide-based thermochromic material to the organic polymer in the organic polymer film containing the vanadium dioxide-based thermochromic material is 1: (1-100); the mass ratio of the fluorescent material to the organic polymer in the organic polymer film containing the fluorescent material capable of absorbing ultraviolet rays and emitting blue light is 1: (1-100); the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material which absorbs ultraviolet rays and emits blue light is 1 (0.1-10).
2. The vanadium dioxide-based fluorescent composite film according to claim 1, wherein the organic polymer film containing the vanadium dioxide-based thermochromic material has a mass ratio of the vanadium dioxide-based thermochromic material to the organic polymer of 1: (3-50); the mass ratio of the fluorescent material to the organic polymer in the organic polymer film containing the fluorescent material capable of absorbing ultraviolet rays and emitting blue light is 1: (2-10).
3. The vanadium dioxide-based fluorescent composite film according to claim 1, wherein the organic polymer film containing the vanadium dioxide-based thermochromic material or the organic polymer film containing the fluorescent material that absorbs ultraviolet rays and emits blue light has a thickness of 1 to 100 μm.
4. The vanadium dioxide-based fluorescent composite film according to claim 1, wherein the vanadium dioxide-based thermochromic material is rutile-phase vanadium dioxide or/and monoclinic-phase vanadium dioxide; the particle size of the vanadium dioxide-based thermochromic material is 10 nm-10 mu m.
5. The vanadium dioxide-based fluorescent composite film according to claim 4, wherein the particle size of the vanadium dioxide-based thermochromic material is 20-80 nm.
6. The vanadium dioxide-based fluorescent composite film according to claim 1, wherein the mass ratio of the vanadium dioxide-based thermochromic material to the fluorescent material that absorbs ultraviolet rays and emits blue light is 2:1 to 1: 2.
7. The vanadium dioxide-based fluorescent composite film according to any one of claims 1 to 6, wherein the organic polymer is at least one of a carbon chain polymer, a heterochain polymer, and an elemental organic polymer.
8. The vanadium dioxide-based fluorescent composite film according to claim 7, wherein the organic polymer is at least one of a polycrystalline resin, a silicone resin, a polyacrylic acid resin, a polyethylene glycol resin, a polyvinyl butyral resin, and a polyvinyl alcohol resin.
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| CN110687693A (en) * | 2019-09-20 | 2020-01-14 | 宁波东旭成新材料科技有限公司 | Thermochromic film |
| CN111909684A (en) * | 2020-08-18 | 2020-11-10 | 西安交通大学 | Flexible and stretchable multi-mode ultraviolet response composite material and preparation and application thereof |
| CN113233782A (en) * | 2021-05-10 | 2021-08-10 | 济南大学 | Modified vanadium dioxide composite film and preparation method thereof |
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