Perovskite quantum dot / polymer dispersed liquid crystal film and preparation method thereof
By synthesizing and modifying perovskite quantum dots using a thermal injection method, the prepared perovskite quantum dot/polymer dispersed liquid crystal film solves the safety and aesthetic issues of electrically controlled dimming films, achieving high contrast, radiative cooling, and information encryption effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-04-03
AI Technical Summary
Existing electronically controlled dimming films have excessively high driving voltages, insufficient safety, low contrast, and their radiation-cooling materials neglect aesthetic features, failing to meet high application requirements.
Perovskite quantum dots were synthesized by thermal injection and then prepared as perovskite quantum dot/polymer dispersed liquid crystal films by dithiol modification and cleaning with toluene and ethyl acetate. Pattern design and information encryption were achieved by combining ultraviolet light masking.
It improves the contrast and electro-optic properties of the thin film, enhances the radiation cooling effect, realizes fluorescent patterns and information encryption, and meets higher application requirements.
Smart Images
Figure CN121779751A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of polymer-dispersed liquid crystal technology, specifically to a perovskite quantum dot / polymer-dispersed liquid crystal film and its preparation method. Background Technology
[0002] According to relevant research, buildings account for 36% of global energy consumption. Traditional temperature regulation, primarily relying on central heating, ventilation, and air conditioning (HVAC) systems, results in significant energy consumption. Ordinary windows are considered the least energy-efficient component, accounting for 60% of total building energy loss. Among existing technologies, electrically controlled dimming smart windows, with their rapid response and active dimming capabilities via an external electric field, are considered an economical, efficient, and rationally designed energy-saving solution, leading to their widespread application. The performance of smart windows depends on their light transmittance (360-780 nm) and solar transmittance (360-2500 nm). Furthermore, radiative cooling technology, utilizing long-wave infrared (2.5-25 micrometers) thermal radiation for surface cooling, has also been extensively studied due to its zero-energy consumption characteristics. Among numerous candidate materials, polymer-dispersed liquid crystal (PDLC) films, with their superior photoelectric properties and ease of mass production, represent an ideal solution to the challenges encountered in the development of smart windows. PDLC is a composite material in which droplet-shaped liquid crystals (LCs) are dispersed in a continuous polymer matrix. In the initial state, the liquid crystal molecules are randomly distributed, and the film exhibits a scattering state. After applying a voltage, the liquid crystal molecules align parallel to the electric field, and the film exhibits a transparent state, thereby achieving active dynamic light modulation.
[0003] However, existing electronically controlled dimming films have excessively high driving voltages, exceeding the safe voltage of 36V for the human body, and their contrast is too low, failing to achieve a good shielding effect. Furthermore, existing radiation cooling materials often focus only on improving cooling capacity, neglecting aesthetic requirements such as editable patterns and adjustable colors.
[0004] Furthermore, radiative cooling technology, which utilizes long-wave infrared thermal radiation to achieve surface cooling, has been extensively studied due to its zero-energy consumption characteristics. Therefore, radiative cooling smart windows can be used to significantly reduce building energy consumption, promote carbon neutrality, and contribute to sustainable development. Among numerous candidate materials, PDLC thin films, with their superior optoelectronic properties and ease of mass production, are considered an ideal solution to address the challenges encountered in the development of smart windows.
[0005] Therefore, it is necessary to develop a perovskite quantum dot / polymer dispersed liquid crystal film with enhanced long-wave infrared emissivity, fluorescent patterns, and information encryption to meet higher application requirements. Summary of the Invention
[0006] To address the aforementioned technical problems, the main objective of this invention is to provide a perovskite quantum dot / polymer dispersed liquid crystal film and its preparation method.
[0007] To achieve the above objectives, the present invention provides a method for preparing perovskite quantum dot / polymer dispersed liquid crystal films, characterized by comprising the following steps:
[0008] S1. Perovskite quantum dots were synthesized using the hot injection method;
[0009] S2. Prepare a toluene solution of perovskite quantum dots with a concentration of 1~4 mg / mL, and add 1.0~3.0 times the mass of perovskite quantum dots as a ligand to modify the surface of the perovskite quantum dots. Then, centrifuge and wash the perovskite quantum dots with a mixed solvent of toluene and ethyl acetate with a volume ratio of 1:2~2:1 to obtain the surface-modified perovskite quantum dots.
[0010] S2. The surface-modified perovskite quantum dots are mixed with UV-polymerizable monomers, crosslinking agents, liquid crystals and UV photoinitiators to prepare a liquid crystal mixture. Then, the mixture is injected into a liquid crystal cell formed by two transparent conductive films and cured under UV light to obtain a perovskite quantum dot / polymer dispersed liquid crystal film.
[0011] The components in the liquid crystal mixture are, by weight, 8-37.5 parts of UV-polymerizable monomer, 2-12.5 parts of crosslinking agent, 50-90 parts of liquid crystal material, 0.5-5 parts of UV photoinitiator, and 0.25-5 parts of surface-modified perovskite quantum dots.
[0012] As a further preferred embodiment of the present invention, the concentration of the toluene solution containing perovskite quantum dots is 1~4 mg / mL, and the mass ratio of perovskite quantum dots to dithiol is 1:1.0~3.0.
[0013] As a further preferred technical solution of the present invention, the dithiol is at least one selected from 1,2-ethanedithiol, 1,3-propanedithiol, 1,4-butanedithiol, 1,5-pentanedithiol, 1,6-hexanedithiol, 1,8-octanedithiol, and 1,10-decanedithiol.
[0014] And / or, the perovskite quantum dots are at least one of CsPbBr3, CsPbI3, CsPbCl3, MAPbBr3, and FAPbI3.
[0015] As a further preferred technical solution of the present invention, the liquid crystal material is a positive liquid crystal, which includes, but is not limited to, nematic liquid crystal, cholesteric liquid crystal or smectic liquid crystal material; wherein the nematic liquid crystal material can be selected from commercially available liquid crystal materials, such as SLC-1717, SLC-1718, SLC-7011, TEB30A, etc. of Yong Sheng Hua Qing Liquid Crystal Materials Co., Ltd., and E7, E8, E44, E48, ZLI-1275, etc. of Merck Liquid Crystal Materials Co., Ltd., but is not limited to these materials;
[0016] And / or, the UV-polymerizable monomer is an acrylic UV-polymerizable monomer, such as isobornyl acrylate, butyl acrylate, cyclohexyl methacrylate or trifluoroethyl acrylate;
[0017] And / or, the crosslinking agent is at least one of 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, and octafluoro-1,6-hexanediol diacrylate;
[0018] And / or, the ultraviolet photoinitiator is at least one of Irg651, Irg184, BME, 1173, and TPO.
[0019] As a further preferred embodiment of the present invention, the thickness of the perovskite quantum dot / polymer dispersed liquid crystal film is 1~100 μm.
[0020] As a further preferred technical solution of the present invention, the centrifugal washing speed is 5000~15000 rpm and the time is 1-15 min.
[0021] As a further preferred technical solution of the present invention, the amount of each component in the liquid crystal mixture by weight is as follows: 16 parts of UV-polymerizable monomer, 4 parts of crosslinking agent, 80 parts of liquid crystal material, 2 parts of UV photoinitiator, and 0.5 parts of surface-modified perovskite quantum dots.
[0022] As a further preferred embodiment of the present invention, the liquid crystal material is a mixed crystal material composed of the following five types of liquid crystals:
[0023]
[0024] .
[0025] As a further preferred embodiment of the present invention, the specific steps of the ultraviolet light curing are as follows:
[0026] The liquid crystal cell is directly irradiated under ultraviolet light until the liquid crystal mixture solidifies, resulting in a perovskite quantum dot / polymer dispersed liquid crystal film with enhanced long-wave infrared emissivity. Alternatively, the liquid crystal cell is first covered with a patterned mask and irradiated under ultraviolet light for 0.5 s to 30 s, then the mask is removed and irradiation continues under ultraviolet light until the liquid crystal mixture solidifies, resulting in a perovskite quantum dot / polymer dispersed liquid crystal film with enhanced long-wave infrared emissivity, fluorescent patterns, and information encryption capabilities.
[0027] As a further preferred embodiment of the present invention, the wavelength of the ultraviolet light is 365 nm and the intensity is 10~30 mW / cm².
[0028] According to a second aspect of the present invention, the present invention also provides a perovskite quantum dot / polymer dispersed liquid crystal film, which is prepared by the above-described preparation method and can be used as an electronically controlled dimming device in the fields of dimming film, radiation cooling, information encryption, information display and automotive decoration.
[0029] Compared with the prior art, the present invention can achieve the following beneficial effects:
[0030] (1) The perovskite quantum dots of the present invention are modified with dithiol and cleaned with toluene and ethyl acetate, which improves the fluorescence properties and stability of the perovskite quantum dots. Furthermore, the introduction of the modified quantum dots improves the contrast of the PDLC film and reduces the response time, thereby improving the electro-optic performance of the PDLC film to a certain extent.
[0031] (2) The modified perovskite quantum dots of the present invention improve the emissivity of the PDLC substrate, enhance the radiation cooling effect, and introduce green fluorescence, thus eliminating the white appearance and realizing fluorescence radiation cooling.
[0032] (3) This invention introduces editable patterns through a masking method;
[0033] (4) This invention optimizes the ultraviolet mask irradiation time to design a dynamic change process that can realize the disappearance-appearance-disappearance of the pattern as the applied voltage increases, thus giving the thin film information encryption effect.
[0034] In summary, the perovskite quantum dot / polymer dispersed liquid crystal film with enhanced long-wave infrared emissivity, fluorescent patterns, and information encryption provided by this invention has broad application prospects in liquid crystal displays, smart glass, energy-saving building materials, automotive decoration, and related fields. Attached Figure Description
[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0036] Figure 1Data were obtained to characterize the fluorescence properties of perovskite quantum dots using fluorescence spectroscopy.
[0037] Figure 2 The image shows the microstructure of the perovskite quantum dots synthesized by the hot-injection method in Example 1.
[0038] Figure 3 This is a schematic diagram of the perovskite quantum dot lattice synthesized by the hot injection method in Example 1.
[0039] Figure 4 The emissivity of the perovskite quantum dot / polymer dispersed liquid crystal films prepared in Examples 3-6 was tested in the mid-infrared band.
[0040] Figure 5 Voltage-transmittance curves for perovskite quantum dot / polymer dispersed liquid crystal film PQD-0.5.
[0041] Figure 6 Scanning electron microscope (SEM) image of perovskite quantum dot / polymer dispersed liquid crystal film PQD-0.5.
[0042] Figure 7 Transmittance curves of perovskite quantum dot / polymer dispersed liquid crystal film PQD-0.5 at different wavelengths.
[0043] Figure 8 Cyclic stability testing of perovskite quantum dot / polymer dispersed liquid crystal film PQD-0.5.
[0044] Figure 9 Patterns of perovskite quantum dot / polymer dispersed liquid crystal films obtained by UV curing for different black mask coverage times are shown.
[0045] Figure 10 The figures show three perovskite quantum dot / polymer dispersed liquid crystal films with different animal patterns introduced by a masking method. In the figure, Rabbit, Dragonfly, and Elephant are the names of the three animal patterns.
[0046] Figure 11 The figure shows the information encryption effect of patterned perovskite quantum dot / polymer dispersed liquid crystal films. In the figure, 0V-20V represent the applied voltages.
[0047] Figure 12 The figure shows the chemical structural formulas of the materials used in Examples 3-6. In the figure, the mixed crystal material E8 is prepared by mixing five liquid crystal materials in a mass percentage ratio.
[0048] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0049] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0050] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.
[0051] Example 1
[0052] The surface modification method for CsPbBr3 quantum dots provided in this embodiment is as follows:
[0053] S101: Synthesis of CsPbBr3 quantum dot nanoparticles via hot-injection method:
[0054] (1) Preparation of Cs source: Weigh 0.2 g Cs2CO3, 1 mL oleic acid (OA) and 10 mL octadecene (ODE) into a 50 mL three-necked flask. Place the three-necked flask on a magnetic stirring heating table, assemble the apparatus and ensure that the flask and condenser are firmly connected. Then turn on the vacuum pump to create a vacuum environment and continuously purge with nitrogen. Stir with a magnetic stirrer at room temperature to accelerate the reaction. When no more bubbles are generated in the flask, raise the temperature to 80 °C and continue the reaction. After the Cs2CO3 solid particles are completely dissolved, stop heating, remove the three-necked flask, and immediately use a disposable pipette to dispense the cesium oleate into glass bottles, seal them and store them in the refrigerator for later use.
[0055] (2) Preparation of perovskite quantum dots by hot injection method: Weigh 0.16 g PbBr2 and 10 mL ODE into a three-necked flask, place the three-necked flask on a magnetic stirring heating table, and gradually heat it to 70 °C. At this time, inject 2 mL OA and 1 mL OAm (oleylamine), and turn on the vacuum pump to evacuate. When the powder is completely dissolved and no more bubbles are generated, the reaction is complete. Continue to introduce nitrogen gas and gradually heat it to 170 °C. Then inject 0.8 mL Cs source. After reacting for 8 s, quickly put the three-necked flask into an ice-water bath for stirring to lower the solution temperature to room temperature, and the target CsPbBr3 quantum dots can be obtained.
[0056] S102: Surface modification and cleaning of perovskite quantum dots
[0057] (1) Take 4 mL of toluene solution containing 10 mg of pure perovskite quantum dots into a brown sample bottle, then add 14.8 mg of 1,8-octanedithiol ligand, and then stir the mixture at room temperature for half an hour.
[0058] (2) Add 20 mL of a 1:1 mixture of toluene and ethyl acetate to the crude solution obtained by the above stirring reaction, and centrifuge at 10,000 rpm for 5 min to obtain a precipitate, which is the surface-modified perovskite quantum dot, labeled as PQD.
[0059] It should be noted that the pure quantum dot products obtained in steps S101 and S102 above should be uniformly stored in toluene for later use, and exposure to air should be avoided as much as possible during the experiment.
[0060] Example 2
[0061] The only difference from Example 1 is that the amount of 1,8-octanedithiol ligand used in step S102 is increased from 14.8 mg to 24 mg. The rest of the process is the same as in Example 1.
[0062] Comparative Example 1
[0063] As a control experiment for Example 1, the only difference from Example 1 is that the solvent used for cleaning in step S102 is different, that is, the mixed solvent of toluene and ethyl acetate is replaced with a single 20 mL toluene.
[0064] Comparative Example 2
[0065] As a control experiment for Example 2, the only difference from Example 2 is that the solvent used for cleaning in step S102 is different, that is, the mixed solvent of toluene and ethyl acetate is replaced with a single 20 mL toluene.
[0066] The surface-modified perovskite quantum dots prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were characterized by fluorescence spectroscopy, and the results are as follows: Figure 1 As shown, Figure 1 In this context, pristine refers to the untreated initial CsPbBr3 quantum dots obtained in step S101, used as a blank control group; 24 mg and 14.8 mg refer to the corresponding masses of 1,8-octanedithiol. According to... Figure 1 It can be seen that PQD obtained when the volume ratio of toluene to ethyl acetate is 1:1 ( Figure 1 The full width at half maximum (WHM) of the peak obtained when the volume ratio of toluene to ethyl acetate is 1:0 is smaller than that of the peak obtained when the volume ratio of toluene to ethyl acetate is 1:0. Figure 1 (referred to as single in Chinese), exhibiting higher purity and fluorescence properties.
[0067] The microstructure and crystal structure of the CsPbBr3 quantum dots obtained in Example 1 were characterized using transmission microscopy, and the results are as follows: Figures 2 to 3 As shown. Among them, Figure 2The image shows the microstructure of CsPbBr3 quantum dots. It can be seen that the quantum dots synthesized by the hot injection method have regular morphology, indicating that the crystal structure is cubic. Figure 3 This is a schematic diagram of the crystal lattice of CsPbBr3 quantum dots. It can be seen that the interplanar spacing of the quantum dots synthesized by the thermal injection method is 0.406 nm, which corresponds to the (110) crystal plane.
[0068] Examples 3-6
[0069] According to the raw material configuration in Table 1, the surface-modified CsPbBr3 quantum dots (PQDs) obtained in Example 1 were mixed with... Figure 12 The UV-polymerizable monomer (IBOA), perovskite quantum dots (CsPbBr3), crosslinking agent (BDDA), liquid crystal (E8), and UV photoinitiator (Irg651) were mixed evenly to obtain a series of liquid crystal mixtures. The liquid crystal film thickness was then 20 μm. The liquid crystal mixture was injected into a liquid crystal cell consisting of two glass substrates coated with indium tin oxide electrodes through capillary action. Ultraviolet light with a wavelength of 365 nm and an intensity of 20 mW / cm² was used for stepwise curing. The specific process was as follows: a black mask with a preset pattern was placed on top of the uncured liquid crystal cell. After curing with ultraviolet light for 1 second, the mask was removed. Then, curing was continued under ultraviolet light for 10 minutes until the liquid crystal mixture was completely cured into a film. Finally, a series of perovskite quantum dot / polymer dispersed liquid crystal film samples (also known as electrically controlled dimming films) were obtained. According to the different PQD contents, the samples were named PQD-0, PQD-0.25, PQD-0.5, and PQD-1, respectively.
[0070] Table 1
[0071]
[0072] To investigate the effect of PQD content on the emissivity of the liquid crystal films in Examples 3-6, the emissivity of the perovskite quantum dot / polymer dispersed liquid crystal films was characterized using infrared spectroscopy. The results are as follows: Figure 4 As shown. According to Figure 4 It can be seen that liquid crystal films with different PQD doping amounts exhibit emissivity of 90.37%, 90.79%, 90.94% and 90.87% in an atmospheric window of 8-13 μm, respectively, with the highest emissivity when the PQD weight fraction is 0.5 parts, showing the best radiative cooling capability.
[0073] The following experiments were conducted using PQD-0.5 as the optimized perovskite quantum dot / polymer dispersed liquid crystal film sample:
[0074] To verify the photoelectric performance of PQD-0.5, a liquid crystal comprehensive parameter tester was used for performance characterization. The results are as follows: Figures 5 to 8 As shown.
[0075] according to Figure 5 It is known that the threshold voltage of the perovskite quantum dot / polymer dispersed liquid crystal film is 28.4 V, which is less than the human body safe voltage of 36 V, and the open state transmittance of the film is 80.9%, exhibiting excellent optical performance.
[0076] according to Figure 6 It can be seen that the microstructure of the perovskite quantum dot / polymer dispersed liquid crystal film is a polymer network structure composed of polymers, in which the mesh portion is the bubbled liquid crystal.
[0077] according to Figure 7 It is known that perovskite quantum dot / polymer dispersed liquid crystal films have low transmittance in both the visible and near-infrared bands when no external voltage is applied.
[0078] according to Figure 8 It can be seen that the perovskite quantum dot / polymer dispersed liquid crystal film still maintains similar photoelectric properties after 10,000 electrical cycles, exhibiting excellent stability.
[0079] To further demonstrate the beneficial technical effects of the present invention, the following ultraviolet curing experiment was conducted on the liquid crystal cells with a PQD weight of 0.5 parts in Examples 3-6. Specifically, 10 sets of liquid crystal cells prepared simultaneously were selected, each corresponding to a black mask with a different letter pattern. The ultraviolet curing time under the black mask was set to 1s, 3s, 10s, 20s, and 30s respectively. The macroscopic effect of the obtained perovskite quantum dot / polymer dispersed liquid crystal film samples is as follows: Figure 9 As shown. According to Figure 9 It is known that gradient-time cured films obtained using black masks with different patterns exhibit varying degrees of polymer curing in different regions of the film due to the masking method, resulting in polymer meshes of different sizes. The scattering effects of polymer meshes of different sizes differ, thus causing variations in contrast across regions of the film, resulting in macroscopic patterns. The longer the UV curing time, the greater the contrast difference between regions of the film, leading to varying levels of readability of the patterns. Information encryption requires that the patterns maintain readability, while simultaneously requiring low contrast across different regions of the film to gradually achieve similar transmittance under an applied voltage, thereby realizing a dynamic process of pattern appearance and disappearance. Therefore, the preferred UV curing time under black mask coverage is 0.5–30 seconds, with 1 second showing the best effect.
[0080] The following UV curing time of 1 second under mask coverage was used as the optimization scheme. Further UV curing experiments were conducted on a liquid crystal cell with a PQD weight of 0.5 parts as described above:
[0081] Figure 10It displays three different animal patterns introduced using a masking method. According to Figure 10 It can be seen that films with different patterns were obtained, demonstrating the editability of the patterns.
[0082] Figure 11 This demonstrates the information encryption effect of a thin film after a pattern is introduced using a masking method. The information encryption effect is shown by dynamically changing the pattern on the thin film as the applied voltage increases, exhibiting a disappearance-appearance pattern. Specifically, under ultraviolet irradiation, the thin film at 0 V displays a blurry butterfly pattern. As an applied electric field is applied, the pattern gradually appears, reaching its clearest point at 6 V. With further increases in voltage, the pattern gradually disappears.
[0083] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.
Claims
1. A method for preparing a perovskite quantum dot / polymer dispersed liquid crystal film, characterized in that, Includes the following steps: S1. Perovskite quantum dots were synthesized using the hot injection method; S2. Prepare a toluene solution of perovskite quantum dots with a concentration of 1~4 mg / mL, and add 1.0~3.0 times the mass of perovskite quantum dots as a ligand to modify the surface of the perovskite quantum dots. Then add a mixed solvent of toluene and ethyl acetate with a volume ratio of 1:2~2:1 and centrifuge and wash to obtain the surface-modified perovskite quantum dots. S3. The surface-modified perovskite quantum dots are mixed with UV-polymerizable monomers, crosslinking agents, liquid crystals and UV photoinitiators to prepare a liquid crystal mixture. Then, the mixture is injected into a liquid crystal cell formed by two transparent conductive films and cured by UV light to obtain a perovskite quantum dot / polymer dispersed liquid crystal film. The components in the liquid crystal mixture are, by weight, 8-37.5 parts of UV-polymerizable monomer, 2-12.5 parts of crosslinking agent, 50-90 parts of liquid crystal material, 0.5-5 parts of UV photoinitiator, and 0.25-5 parts of surface-modified perovskite quantum dots.
2. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The concentration of the toluene solution containing perovskite quantum dots is 1~4 mg / mL, and the mass ratio of perovskite quantum dots to dithiol is 1:1.0~3.
0.
3. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The dithiol is at least one selected from 1,2-ethanedithiol, 1,3-propanedithiol, 1,4-butanedithiol, 1,5-pentanedithiol, 1,6-hexanedithiol, 1,8-octanedithiol, and 1,10-decanedithiol. And / or, the perovskite quantum dots are at least one of CsPbBr3, CsPbI3, CsPbCl3, MAPbBr3, and FAPbI3.
4. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The liquid crystal material is a positive liquid crystal; And / or, the UV-polymerizable monomer is at least one of isobornyl acrylate, butyl acrylate, cyclohexyl methacrylate, and trifluoroethyl acrylate; And / or, the crosslinking agent is at least one of 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, and octafluoro-1,6-hexanediol diacrylate; And / or, the ultraviolet photoinitiator is at least one of Irg651, Irg184, BME, 1173, and TPO.
5. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The thickness of the perovskite quantum dot / polymer dispersed liquid crystal film is 1~100 μm.
6. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, By weight, the amounts of each component in step S3 are as follows: 16 parts of UV-polymerizable monomer, 4 parts of crosslinking agent, 80 parts of liquid crystal material, 2 parts of UV photoinitiator, and 0.5 parts of surface-modified perovskite quantum dots.
7. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The specific steps for ultraviolet light curing are as follows: The liquid crystal cell is directly irradiated under ultraviolet light until the liquid crystal mixture solidifies; Alternatively, the liquid crystal cell can be covered with a patterned mask and irradiated under ultraviolet light for 0.5s to 30s. Then the mask is removed and irradiation under ultraviolet light continues until the liquid crystal mixture solidifies.
8. The method for preparing perovskite quantum dot / polymer dispersed liquid crystal thin films according to claim 1, characterized in that, The ultraviolet light has a wavelength of 365 nm and an intensity of 10~30 mW / cm².
9. A perovskite quantum dot / polymer dispersed liquid crystal film, characterized in that, It is prepared by the preparation method according to any one of claims 1-8.
10. The perovskite quantum dot / polymer dispersed liquid crystal film of claim 9 is used as an electronically controlled dimming device in dimming films, radiative cooling, information encryption, information display, and automotive decoration.