Polymer, film, device, preparation method and application
By arylation polycondensation of compound X with compound VII, compound VIII, and compound IX, an electrochromic/electrically controlled fluorescent polymer with high fluorescence contrast and stability was prepared, which solved the problems of insufficient fluorescence contrast and stability in the existing technology and achieved efficient optical display, sensor, and 3D coded information storage applications.
Patent Information
- Application Number
- CN202410947906.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2044-07-16
AI Technical Summary
Existing electrochromic/electrofluorescent bifunctional polymers perform poorly in terms of fluorescence contrast and stability, limiting their application effectiveness in high-resolution display, fine information transmission, and complex environmental monitoring.
An electrochromic/electro-controlled fluorescent bifunctional polymer with high fluorescence contrast was prepared by arylation polycondensation of compound X with compound VII, compound VIII, and compound IX. An aniline structure was introduced to enhance the fluorescence contrast and stability of the material, and an electrochromic layer was formed by solution processing into a film.
The fluorescence contrast and color change stability of the polymer are significantly enhanced, ensuring that the material can maintain good performance after multiple electrochemical cycles, reducing the cost of film preparation, and improving coating uniformity and quality.
Smart Images
Figure CN118878793B_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of organic polymer chemistry, and specifically relates to an electrochromic / electrically controlled fluorescent bifunctional polymer, a preparation method and application thereof, and a film and device prepared using the bifunctional polymer. Background Art
[0002] Electrochromic / electrofluorochromic (EC / EFC) is a reversible redox reaction in a material caused by the injection and removal of charge under an applied electric field, accompanied by the doping and dedoping of electrolyte ions. This phenomenon results in a stable and reversible change in the material's optical properties, typically manifesting as a change in color and fluorescence.
[0003] Based on the differences in material structure, electrochromic / electrofluorescent materials are mainly divided into two categories: small molecule electrochromic / electrofluorescent materials and polymer electrochromic / electrofluorescent materials. The core advantage of polymer electrochromic / electrofluorescent materials lies in their band gap tunability, which means that through sophisticated chemical design, the absorption and emission wavelengths of the material can be precisely controlled, thereby achieving precise control of the luminescent color. In addition to their superior optical and electrical properties, polymer electrochromic / electrofluorescent materials also have excellent mechanical robustness and physical stability, which greatly enhances the durability and service life of the material. In addition, the excellent processability of polymer electrochromic / electrofluorescent materials allows for large-scale production through simple methods, and is particularly suitable for the manufacture of large-area flexible films, providing broad innovation space for application areas such as smart windows.
[0004] At present, although electrochromic / electrofluorescent bifunctional polymers have shown great potential in the field of smart materials, there are still several challenges in converting them into practical applications, especially in the preparation of electrochromic / electrofluorescent devices. Among them, the lack of fluorescence contrast and stability is the main technical obstacle that currently limits the application of bifunctional polymers. Fluorescence contrast, that is, the degree of difference in fluorescence intensity of the material under different electrochemical states, is crucial for achieving high-definition visual feedback and fine information display. Ideally, bifunctional polymers should exhibit significant changes in fluorescence intensity between the oxidized and reduced states to ensure a high-contrast display effect. However, most of the existing bifunctional polymer materials perform poorly in this regard, which directly affects the application efficiency of the materials in fields such as high-resolution display, fine information transmission, and complex environmental monitoring. Summary of the Invention
[0005] To solve the above technical problems, this application mainly provides an electrochromic / electrically controlled fluorescent dual-functional polymer. This is achieved through the following technical solutions:
[0006] A polymer, wherein the structural formula of the repeating unit of the polymer is as follows:
[0007] Wherein, n is 20 to 1000; R is selected from naphthalene, anthracene, and pyrene.
[0008] A method for preparing the above polymer, wherein the polymer is obtained by arylation polycondensation of compound X and compound VII; the structural formulas of compound VII and compound X are shown below:
[0009]
[0010] A method for preparing the above polymer, wherein the polymer is obtained by arylation polycondensation of compound X and compound VIII; the structural formulas of compound VIII and compound X are shown below:
[0011]
[0012] A method for preparing the above polymer, wherein the polymer is obtained by arylation polycondensation of compound X and compound IX; the structural formulas of compound IX and compound X are shown below:
[0013]
[0014] Application of the above-mentioned polymer in the fields of optical display, sensor and 3D coding information storage.
[0015] A film comprising a substrate and an electrochromic layer formed on the substrate surface by solution processing; the electrochromic layer is made of the aforementioned polymer material. Solution processing involves dissolving the polymer in a solvent to obtain a solution, coating the solution on the substrate, and drying to obtain the film.
[0016] Preferably, the solvent used in the solution processing film formation is any one of dichloromethane, chloroform, tetrahydrofuran, toluene, and dimethylformamide.
[0017] Preferably, the substrate is selected from any one of indium tin oxide conductive glass, fluorine tin oxide conductive glass and polyethylene terephthalate conductive substrate.
[0018] A device comprising the film described in any one of the above items.
[0019] Compared with the prior art, this application has the following beneficial effects:
[0020] This application describes an electrochromic / electrofluorescent bifunctional polymer with high fluorescence contrast, obtained by polycondensing compound X with one of compounds VII, VIII, and IX. The aniline moiety in the polymer possesses both electrochromic and electrofluorescent functions, and because the aniline moiety is embedded with units exhibiting aggregation-induced emission, the polymer's fluorescence contrast is significantly enhanced. This property means that the polymer material exhibits more pronounced changes in fluorescence intensity under different electrochemical states, providing strong support for high-contrast displays and information encoding.
[0021] The polymers in this application improve the color stability of the bifunctional polymer by introducing Compound X, ensuring that the material maintains good performance after multiple electrochemical cycles. This is crucial for achieving long-life, high-reliability electrochromic / electrically controlled fluorescent devices. Furthermore, the introduction of Compound X improves the solubility of the bifunctional polymer material, significantly reducing the cost of film preparation and significantly improving the coating uniformity and quality of the film.
[0022] In addition, this application successfully prepared electrochromic / electrofluorescent bifunctional polymers with different fluorescent colors through aromatic polycondensation combined with fine regulation of the main chain aniline compounds. These materials have fast response speed and good stability, and are expected to be used in optical displays, sensors and 3D coded information storage fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is the cyclic voltammetry curve of PP-DNPC film;
[0024] Figure 2 UV-visible absorption spectra of PP-DNPC films at different voltages;
[0025] Figure 3 、 4 The transmittance variation curve of PP-DNPC film in 595nm band under different voltages;
[0026] Figure 5 、 6 The fluorescence intensity change curve of PP-DNPC film at 606nm band under different voltages;
[0027] Figure 7 is the cyclic voltammetry curve of PP-DDPC film;
[0028] Figure 8 UV-visible absorption spectra of PP-DDPC film at different voltages;
[0029] Figure 9 、 10The transmittance variation curve of PP-DDPC film in 582nm band under different voltages;
[0030] Figure 11 、 12 This is the fluorescence intensity change curve of PP-DDPC film in the 610nm band under different voltages.
[0031] Figure 13 is the cyclic voltammetry curve of PP-DAPC film;
[0032] Figure 14 UV-visible absorption spectra of PP-DAPC film at different voltages;
[0033] Figure 15 、 16 The transmittance change curve of PP-DAPC film in 603nm band under different voltages;
[0034] Figure 17 、 18 The fluorescence intensity change curve of PP-DAPC film at 623nm band under different voltages;
[0035] Figure 19 The reaction formula for preparing compound VII, compound VIII, and compound IX;
[0036] Figure 20 The reaction formula for preparing polymers PP-DNPC, PP-DDPC and PP-DAPC is shown in FIG. DETAILED DESCRIPTION
[0037] The present application will be further described below in the form of specific embodiments. Those skilled in the art will be able to implement the present application based on these descriptions. In addition, the embodiments of the present application involved in the following description are generally only embodiments of a portion of the present application, rather than all embodiments. Therefore, based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative efforts should fall within the scope of protection of the present application.
[0038] Please see the attached Figure 19 、 20 The preparation methods of compound VII, compound VIII and compound IX in the following examples are as follows.
[0039] Preparation of compound I. In a 250mL round-bottom flask, 0.9371g (6mmol) of 1-naphthaldehyde, 1.1956g (6.1mmol) of 4-bromobenzeneacetonitrile and 30mL of ethanol solution were added and stirred at 40°C for 15min to fully dissolve. Subsequently, 16 drops of tetrabutylammonium hydroxide solution were added and heated with stirring for 4h. After the reaction was completed, the blue-green solid product was collected and washed with a large amount of ethanol solution until the solution was clear and transparent. The obtained blue-green solid was then placed in a vacuum oven and dried at 60°C for 3h to obtain 1.9385g (5.8mmol) of blue-green solid with a yield of 96.7%.
[0040] Preparation of compound II. In a 250mL round-bottom flask, 0.9540g (6mmol) of 1-anthracenecarboxaldehyde, 1.1956g (6.1mmol) of 4-bromobenzeneacetonitrile and 30mL of ethanol solution were added and stirred at 40°C for 15min to fully dissolve. Subsequently, 16 drops of tetrabutylammonium hydroxide solution were added and heated with stirring for 4h. After the reaction, the yellow solid product was collected and washed with a large amount of ethanol solution until the solution was clear and transparent. The resulting yellow solid was then placed in a vacuum oven and dried at 60°C for 3h to obtain 2.0313g (5.29mmol) of yellow solid with a yield of 88.1%.
[0041] Preparation of compound III. In a 250mL round-bottom flask, 1.3816g (6mmol) of 1-anthracenecarboxaldehyde, 1.1956g (6.1mmol) of 4-bromobenzeneacetonitrile and 30mL of ethanol solution were added and stirred at 40°C for 15min to fully dissolve. Subsequently, 16 drops of tetrabutylammonium hydroxide solution were added and heated with stirring for 6h. After the reaction was completed, the yellow solid product was collected and washed with a large amount of ethanol solution until the solution was clear and transparent. The obtained bright yellow solid was then placed in a vacuum oven and dried at 60°C for 3h to obtain 1.9967g (4.89mmol) of orange solid with a yield of 81.5%.
[0042] Preparation of catalyst: Under nitrogen atmosphere, tris(dibenzylideneacetone)dipalladium(0) (24 mg, 0.026 mmol) and tri-tert-butylphosphine (5.5 mg, 0.026 mmol) were dissolved in anhydrous toluene (12 mL) and stirred at room temperature for 10 min to obtain a preformed catalyst.
[0043] Preparation of compound IV. Under a nitrogen atmosphere, add diphenylamine (0.3553 g, 2.1 mmol), 2-(4-bromophenyl)-3-(naphthalene-1-yl)acrylonitrile (0.8356 g, 2.5 mmol) and sodium tert-butoxide (0.3015 g, 3.14 mmol), anhydrous toluene solution (25 mL) and a preformed catalyst in sequence. The reaction mixture was heated under reflux at 90°C for 24 h and then cooled to room temperature. After the reaction, it was extracted three times with saturated brine and dichloromethane. The organic phase extract was collected, concentrated in vacuo, dehydrated with anhydrous sodium sulfate, and purified by silica gel column chromatography. The mobile phase was dichloromethane and petroleum ether in a ratio of 4:1. The eluent containing the target compound was collected by thin layer chromatography, the solvent was evaporated, and dried to obtain 0.7211 g of a yellow-green solid product compound with a yield of 81.3%.
[0044] Preparation of compound V. Under a nitrogen atmosphere, add diphenylamine (0.3553 g, 2.1 mmol), 2-(4-bromophenyl)-3-(anthracen-9-yl)acrylonitrile (0.9607 g, 2.5 mmol) and sodium tert-butoxide (0.3015 g, 3.14 mmol), anhydrous toluene solution (25 mL) and a preformed catalyst in sequence. The reaction mixture was heated under reflux at 90°C for 24 h and then cooled to room temperature. After the reaction, it was extracted three times with saturated brine and dichloromethane. The organic phase extract was collected, concentrated in vacuo, and then dehydrated with anhydrous sodium sulfate and purified by silica gel column chromatography. The mobile phase was dichloromethane and petroleum ether in a ratio of 3:1. The eluent containing the target compound was collected by thin layer chromatography, the solvent was evaporated, and dried to obtain 0.7844 g of a yellow-green solid product compound with a yield of 79.1%.
[0045] Preparation of compound VI. Under a nitrogen atmosphere, add diphenylamine (0.3553 g, 2.1 mmol), 2-(4-bromophenyl)-3-(pyrene-1-yl)acrylonitrile (1.0208 g, 2.5 mmol) and sodium tert-butoxide (0.3015 g, 3.14 mmol), anhydrous toluene solution (25 mL) and a preformed catalyst in sequence. The reaction mixture was heated under reflux at 90°C for 24 h and then cooled to room temperature. After the reaction, it was extracted three times with saturated brine and dichloromethane. The organic phase extract was collected, concentrated in vacuo, and then dehydrated with anhydrous sodium sulfate and purified by silica gel column chromatography. The mobile phase was dichloromethane and petroleum ether in a ratio of 4:1. The eluent containing the target compound was collected by thin layer chromatography, the solvent was evaporated, and dried to obtain 0.8274 g of a yellow-green solid product compound with a yield of 79.4%.
[0046] Preparation of compound VII. Under a nitrogen atmosphere, N-bromosuccinimide (NBS) (1.0 g, 5.64 mmol) and 20 mL of chloroform were added to a 100 mL Shrek tube wrapped in tin foil for light protection, and stirred at 0°C for 15 min. A chloroform solution (10 mL) containing compound IV (0.8356 g, 2.5 mmol) was slowly added dropwise in three portions and stirred at room temperature overnight. After the reaction was completed, the reaction was quenched with saturated brine, the reaction solution was extracted three times with dichloromethane, the organic phases were combined, and anhydrous Na2SO4 was added to remove water. The crude product was concentrated by evaporation to obtain the crude product, which was purified by column chromatography using dichloromethane and petroleum ether as the mobile phase in a ratio of 3:1. The solvent was evaporated to obtain 1.0868 g of a yellow solid product with a yield of 88%.
[0047] Preparation of compound VIII. Under a nitrogen atmosphere, N-bromosuccinimide (NBS) (1.0 g, 5.64 mmol) and 20 mL of chloroform were added to a 100 mL Shrek tube wrapped in tin foil for light protection and stirred at 0°C for 15 min. A chloroform solution (10 mL) containing compound V (0.9607 g, 2.5 mmol) was slowly added dropwise in three portions and stirred at room temperature overnight. After the reaction was completed, the reaction was quenched with saturated brine, the reaction solution was extracted three times with dichloromethane, the organic phases were combined, and anhydrous Na2SO4 was added to remove water. The crude product was concentrated by evaporation to obtain a crude product, which was purified by column chromatography using dichloromethane and petroleum ether as the mobile phase in a ratio of 3:1. The solvent was evaporated to obtain 1.1090 g of a yellow solid product with a yield of 82%.
[0048] Preparation of compound IX. Under a nitrogen atmosphere, N-bromosuccinimide (NBS) (1.0 g, 5.64 mmol) and 20 mL of chloroform were added to a 100 mL Shrek tube wrapped in tin foil for light protection, and stirred at 0°C for 15 min. A chloroform solution (10 mL) containing compound VI (1.0208 g, 2.5 mmol) was slowly added dropwise in three portions and stirred at room temperature overnight. After the reaction was completed, the reaction was quenched with saturated brine, the reaction solution was extracted three times with dichloromethane, the organic phases were combined, and anhydrous Na2SO4 was added to remove water. The crude product was concentrated by evaporation to obtain the crude product, which was purified by column chromatography using dichloromethane and petroleum ether as the mobile phase in a ratio of 4:1. The solvent was evaporated to obtain 1.2247 g of an orange solid product with a yield of 86%.
[0049] Example 1: Preparation of polymer PP-DNPC and film
[0050] Under a nitrogen atmosphere, palladium acetate (40 mg, 0.178 mmol), potassium carbonate (0.56 g, 4.02 mmol), pivalic acid (61.64 mg, 0.604 mmol), compound X (0.7191 g, 2.02 mmol), and compound VII (1.1716 g, 2.02 mmol) were added to a 50 mL two-necked round-bottom flask. 25 mL of anhydrous DMAc was then added, and the mixture was reacted at 140°C for 24 h. After the reaction, the mixture was cooled to room temperature and 100 mL of methanol was added to precipitate the solid, which was then filtered to obtain the crude product. The crude product was then Soxhlet extracted with methanol, petroleum ether, acetone, and chloroform, in that order. The chloroform wash was retained to obtain the electrochromic / electrofluorescent polymer PP-DNPC.
[0051] Dissolve the prepared electrochromic / electrofluorescent polymer PP-DNPC in chloroform to a 2 mg / mL solution and set aside. Place an indium tin oxide conductive glass substrate on a hotplate at 100°C. Use a spray gun to evenly spray the solution onto the substrate surface 10 times. After spraying, dry the solution in a 65°C oven to obtain a thin film of the electrochromic / electrofluorescent polymer PP-DNPC.
[0052] Example 2: Preparation of polymer PP-DDPC and film
[0053] Under a nitrogen atmosphere, palladium acetate (40 mg, 0.178 mmol), potassium carbonate (0.56 g, 4.02 mmol), pivalic acid (61.64 mg, 0.604 mmol), compound X (0.7191 g, 2.02 mmol), and compound VIII (1.2726 g, 2.02 mmol) were added to a 50 mL two-necked round-bottom flask. 25 mL of anhydrous DMAc was then added, and the mixture was reacted at 140°C for 18 h. After the reaction, the mixture was cooled to room temperature and 100 mL of methanol was added to precipitate the solid, which was then filtered to obtain the crude product. The crude product was then Soxhlet extracted with methanol, petroleum ether, acetone, and chloroform, in that order. The chloroform wash was retained to obtain the electrochromic / electrofluorescent polymer PP-DDPC.
[0054] Dissolve the prepared electrochromic / electrofluorescent polymer in chloroform to a 2 mg / mL solution and set aside. Place an indium tin oxide conductive glass substrate on a hotplate at 100°C. Use a spray gun to evenly spray the solution onto the substrate surface 10 times. After spraying, dry the solution in a 65°C oven to obtain an electrochromic / electrofluorescent polymer PP-DDPC film.
[0055] Example 3: Preparation of polymer PP-DAPC and film
[0056] Under a nitrogen atmosphere, palladium acetate (40 mg, 0.178 mmol), potassium carbonate (0.56 g, 4.02 mmol), pivalic acid (61.64 mg, 0.604 mmol), compound X (0.7191 g, 2.02 mmol), and compound IX (1.3251 g, 2.02 mmol) were added to a 50 mL two-necked round-bottom flask. 25 mL of anhydrous DMAc was then added and the mixture was reacted at 140°C for 24 h. After the reaction, the mixture was cooled to room temperature and 100 mL of methanol was added to precipitate the solid, which was then filtered to obtain the crude product. The crude product was then Soxhlet extracted with methanol, petroleum ether, acetone, and chloroform, in that order. The chloroform wash was retained to obtain the electrochromic / electrofluorescent polymer PP-DAPC.
[0057] Dissolve the prepared electrochromic / electrofluorescent polymer in chloroform to a 2 mg / mL solution and set aside. Place an indium tin oxide conductive glass substrate on a hotplate at 100°C. Use a spray gun to evenly spray the solution onto the substrate surface 10 times. After spraying, dry the solution in a 65°C oven to obtain an electrochromic / electrofluorescent polymer PP-DAPC film.
[0058] Performance Test 1
[0059] 0.106 g of lithium perchlorate was added to a 10 mL volumetric flask and the volume was adjusted with acetonitrile (ACN) to obtain a 0.1 mol / L solution, which was used as a blank supporting electrolyte solution. The blank supporting electrolyte solution was used as the test solution. The PP-DNPC film sprayed as described in Example 1 was used as the working electrode, a Pt wire as the counter electrode, and an Ag / AgCl reference electrode to form a three-electrode system. The following tests were performed:
[0060] Cyclic voltammetry performance test. The cyclic voltammetry test voltage range is 0~1.3V, and the test results are as follows Figure 1 As shown. Figure 1 It can be seen that the prepared electrochromic / electrofluorescent PP-DNPC film has a certain redox ability.
[0061] Spectral and electrochromic performance test. Test the spectral performance of PP-DNPC film at a wavelength of 300 to 1100 nm. The test results are as follows: Figure 2 As shown. By testing the absorption change curve of the PP-DNPC film at the maximum absorption wavelength of 595nm under the step voltage of 0~1.1V (as shown Figure 3 The optical contrast of the film was 36.6%. The coloring time was 1.4s and the fading time was 0.8s. The cyclic stability of the film at 595nm was further tested (as shown in FIG. Figure 4As shown in FIG, after 250 cycles, the optical contrast of the PP-DNPC film maintained 53.4% of the original contrast, which shows that the prepared electrochromic / electrically controlled fluorescent film has good electrochromic properties.
[0062] The spectral performance of the PP-DNPC film was tested at a wavelength of 606 nm. The test results are as follows: Figure 5 As shown in Figure 2, the fluorescence switching contrast of the obtained film is 294. The coloring time is 4.3s and the fading time is 4.8s. The fluorescence cycle stability of the film at 606nm was further tested. Figure 6 As shown, after 50 cycles, the maximum fluorescence switching contrast of the PP-DNPC film maintained 75.6% of the original contrast, which shows that the prepared electrochromic / electrofluorescent film has good electrofluorescent properties.
[0063] Performance Test 2
[0064] The difference between this performance test and performance test 1 is that the performance of the electrochromic / electrofluorescent polymer PP-DDPC film is tested.
[0065] Cyclic voltammetry performance test. The cyclic voltammetry test voltage range is 0~1.3V, and the test results are as follows Figure 7 As shown. Figure 7 It can be seen that the prepared electrochromic / electrofluorescent PP-DDPC film has a certain redox ability.
[0066] Spectral and electrochromic performance test. Test the spectral performance of PP-DDPC film at a wavelength of 300 to 1100 nm. The test results are as follows: Figure 8 As shown. By testing the absorption change curve of the PP-DDPC film at the maximum absorption wavelength of 582nm under the step voltage of 0~1.1V (as shown Figure 9 The optical contrast of the film was 42.8%. The coloring time was 1.4s and the fading time was 0.9s. The cyclic stability of the film at 582nm was further tested (as shown in FIG. Figure 10 As shown in FIG, after 250 cycles, the optical contrast of the PP-DDPC film maintained 57.5% of the original contrast, which shows that the prepared electrochromic / electrically controlled fluorescent film has good electrochromic properties.
[0067] Test of the electro-fluorescence performance. Test the spectral performance of the PP-DDPC film at a wavelength of 610nm. The test results are as follows: Figure 11 As shown in Figure 2, the fluorescence switching contrast of the obtained film is 210. The coloring time is 3.1s and the fading time is 3.6s. The fluorescence cycle stability of the film at 606nm was further tested. Figure 12As shown, after 50 cycles, the maximum fluorescence switching contrast of the PP-DDPC film maintained 79.5% of the original contrast, which shows that the prepared electrochromic / electrofluorescent film has good electrofluorescent properties.
[0068] Performance Test 3
[0069] The difference between this performance test and performance test 1 is that the performance of the electrochromic / electrofluorescent polymer PP-DAPC film is tested.
[0070] Cyclic voltammetry performance test. The cyclic voltammetry test voltage range is 0~1.3V, and the test results are as follows Figure 13 As shown. Figure 13 It can be seen that the prepared electrochromic / electrofluorescent PP-DAPC film has a certain redox ability.
[0071] Spectral and electrochromic performance test. The spectral performance of PP-DAPC film at wavelengths of 300 to 1100 nm, the test results are as follows Figure 14 As shown. By testing the absorption change curve of the PP-DAPC film at the maximum absorption wavelength of 603nm under the step voltage of 0~1.1V (as shown Figure 15 The optical contrast of the film was 36.6%. The coloring time was 1.5s and the fading time was 0.8s. The cyclic stability of the film at 603nm was further tested (as shown in FIG. Figure 16 As shown in FIG, after 250 cycles, the optical contrast of the PP-DNPC film maintained 53.3% of the original contrast, which shows that the prepared electrochromic / electrically controlled fluorescent film has good electrochromic properties.
[0072] The spectral performance of PP-DAPC film at a wavelength of 623nm is tested. Figure 17 As shown in Figure 2, the fluorescence switching contrast of the obtained film is 200. The coloring time is 1.9s and the fading time is 3.8s. The fluorescence cycle stability of the film at 606nm was further tested. Figure 18 As shown, after 50 cycles, the maximum fluorescence switching contrast of the PP-DNPC film maintained 85.4% of the original contrast, which shows that the prepared electrochromic / electrofluorescent film has good electrofluorescent properties.
Claims
1. A polymer, characterized in that The structural formula of the repeating unit of the polymer is shown below: Wherein, n is 20 to 1000; R is selected from naphthalene, anthracene, and pyrene.
2. A method for preparing the polymer according to claim 1, characterized in that: The polymer is obtained by arylation polycondensation of compound X and compound VII; the structural formulas of compound VII and compound X are shown below:
3. A method for preparing the polymer according to claim 1, characterized in that: The polymer is obtained by arylation polycondensation of compound X and compound VIII; the structural formulas of compound VIII and compound X are shown below:
4. A method for preparing the polymer according to claim 1, characterized in that: The polymer is obtained by arylation polycondensation of compound X and compound IX; the structural formulas of compound IX and compound X are shown below:
5. Use of the polymer according to claim 1 in the fields of optical display, sensor and 3D coded information storage.
6. A film, characterized in that The invention comprises a substrate and an electrochromic layer formed on the surface of the substrate by solution processing into a film; the electrochromic layer adopts the polymer material according to claim 1.
7. A film according to claim 6, characterized in that: The solvent used in the solution processing film formation is any one of dichloromethane, chloroform, tetrahydrofuran, toluene and dimethylformamide.
8. A film according to claim 6, characterized in that: The substrate is selected from any one of indium tin oxide conductive glass, fluorine tin oxide conductive glass and polyethylene terephthalate conductive substrate.
9. A device, characterized in that A film comprising the film according to any one of claims 6 to 8.