Electrophoretic particle based on quantum dots, microcapsule and preparation method and application thereof

Abstract

The invention discloses an electrophoretic particle based on quantum dots, a microcapsule and a preparation method and application of the electrophoretic particle. The electrophoretic particle comprises polymer microspheres, the quantum dots, a charge control agent and an additive. The charge control agent, the additive and the quantum dots are independently dispersed and wrapped in the polymeric microsphere matrix, and / or adsorbed on the surface of the polymeric microsphere and the inner wall of a pore channel. The method is mainly used for display application of a microcapsule electrophoresis display module (namely electronic paper). The quantum dots and the polymer are compounded to prepare the microspheres, the charged molecules, the charge stabilizer and other additives are added into the microspheres, the electrophoretic particles with the light-emitting effect are finally formed, the electrophoretic particles are applied to the microcapsule display module, the high-saturation color display effect can be achieved, meanwhile, the stimulated emission fluorescence effect is achieved, and the application prospect is wide. The effect of clearly displaying contents in an environment with weak ambient light can be achieved.

Description

Technical Field

[0001] The present application relates to a quantum dot-based electrophoretic particle and a preparation method and application thereof, belonging to the field of display technology. Background Art

[0002] Electronic paper is a widely used display technology with the characteristics of bistable, thin, and flexible. It has been widely used in electronic tags, e-books, and smart signage scenarios. The application principle of electronic paper is to disperse electrophoretic particles with positive and negative charges in microcapsules, which move under the action of the electric field. By changing the type of floating particles, the display color is changed to form text and images that can be distinguished by the human eye. In the early days of electrophoretic display technology, only carbon black particles (black) and titanium dioxide particles (white) with positive and negative charges were usually used to achieve black and white display. However, with the improvement of display content and display effect requirements, the demand for color electrophoretic display is increasing. At present, the method of realizing color electrophoretic display includes adding a color filter above the black and white electronic ink film, or adding electrophoretic particles containing cyan, magenta, and yellow pigments to the microcapsules. However, both solutions achieve color through the absorption and reflection of specific bands of natural light by filters or pigment particles. This method usually makes it difficult to achieve high-saturation color display effects, and the color gamut is usually lower than 50% NTSC. On the other hand, since electrophoretic display relies on reflecting natural light to achieve display effects, it cannot display normally in scenes with extremely low ambient light (such as at night, in dark rooms, etc.), and it is necessary to add a white surface light source to the module to supplement the problem of insufficient ambient light.

[0003] Quantum dots are a type of semiconductor nanoparticle with a small particle size (≤20nm) and unique fluorescence conversion properties (can absorb short-wavelength blue-violet light and convert it into long-wavelength red and green light). In a natural light environment, quantum dots can not only absorb natural light in a specific band, but also emit a certain amount of high-purity fluorescence in a specific band under the excitation of natural light, making the final visual color effect more saturated and achieving a color display effect with a higher color gamut. In addition, if an electrophoretic display module containing quantum dots is used, the quantum dots can emit fluorescence of a specific wavelength under the excitation of a low blue light or ultraviolet light source, thereby achieving a higher brightness display effect in low ambient light scenes. However, the existing technology of electrophoretic display modules containing quantum dots still has the following problems: 1. When the structure of coating quantum dots on the surface of charged particles is adopted, ① after the quantum dots are coated on the surface of charged particles, it is easy to destroy the surface charge state of the charged particles, so that the electrophoresis effect is reduced; ② the quantum dots are usually not coated firmly on the surface of charged particles, and they are easy to fall off to form free quantum dots. Since the quantum dots themselves are not charged, they cannot move under the action of the electric field, which will cause a serious decrease in display contrast; ③ the quantum dots themselves have poor stability, and they cannot be well protected when coated on the surface of charged particles, so that the quantum dots are easily destroyed by water, oxygen or electrophoretic dispersion solvents, and lose the fluorescence effect, resulting in a decrease in service life. 2. When preparing the display module with a structure in which there is only one quantum dot in each microcapsule, the microcapsules need to be arranged alternately in a red, green and blue three-color mode, and the diameter of the microcapsules is only 5 to 1000 microns (if high-resolution display is to be achieved, the smaller the diameter, the better), and it is difficult to achieve regular arrangement in the actual production and processing process. 3. When using nano-scale quantum dot particles directly as electrophoretic particles, it is difficult to load a lot of charges or charged groups on the surface because the size of the quantum dot particles is at the nanometer level, so it is difficult to reach a sufficient zeta potential and cannot achieve effective movement under the electric field. Summary of the invention

[0004] According to one aspect of the present application, a quantum dot-based electrophoretic particle and a preparation method and application thereof are provided to solve the above-mentioned problem.

[0005] This application adopts the following technical solutions:

[0006] A quantum dot-based electrophoretic particle, comprising polymer microspheres, quantum dots, a charge regulator, and an additive;

[0007] The charge regulator, additive and quantum dots are independently dispersed and encapsulated in the polymer microsphere matrix.

[0008] Optionally, the particle size of the polymer microspheres is 100 to 50000 nm;

[0009] Optionally, the weight ratio of polymer microspheres to quantum dots is 1:0.00005-1;

[0010] Optionally, the weight ratio of the polymer microspheres to the charge regulator is 1:0.01 to 0.2;

[0011] Optionally, the weight ratio of the polymer microspheres to the additive is 1:0.005-0.5.

[0012] Optionally, the quantum dots include at least one of cadmium selenide quantum dots, cadmium telluride quantum dots, copper indium sulfide quantum dots, indium phosphide quantum dots, perovskite quantum dots, carbon quantum dots, graphene quantum dots, cuprous sulfide quantum dots, and zinc selenide quantum dots.

[0013] Optionally, the charge regulator is adsorbed on the surface of the polymer microspheres by grafting.

[0014] Optionally, the material of the polymer microspheres is selected from at least one of polytetrafluoroethylene, polyvinylidene fluoride, polystyrene, polymethyl methacrylate, polycarbonate, polyethylene, polypropylene, polyetheretherketone, polyurethane, polyacrylonitrile, polyacrylamide, polyvinyl pyrrolidone, polyethylene glycol, polyvinyl alcohol, polyvinyl acetate, and ethylene-vinyl acetate copolymer.

[0015] Optionally, the charge regulator is selected from at least one of nigrosine, quaternary ammonium salts, azo metal complexes, tert-butyl salicylic acid metal complexes, benzilic acid complexes, calix aromatic ring derivatives, and resin-type charge regulators.

[0016] Optionally, the additive is selected from at least one of a surfactant, a leveling agent, a defoaming agent, an antioxidant, a diffusant, and a water absorbent.

[0017] According to another aspect of the present application, a method for preparing the above-mentioned quantum dot-based electrophoretic particles is provided, comprising the following steps:

[0018] The quantum dots or quantum dot precursors are mixed with raw materials containing polymers, additives, charge control agents, and solvent I, and spray-dried to prepare the quantum dot-based electrophoretic particles.

[0019] Optionally, the spray drying conditions include: a temperature of 80 to 150°C, an air volume of 0.5 to 10 m 3 / h, the atomization gas-liquid flow rate ratio is 0.2-10:1, and the liquid inlet volume is 0.1-10L / min.

[0020] Optionally, the spray drying further includes post-drying treatment, and the conditions of the post-drying treatment are: drying temperature of 80 to 150° C., and drying time of 0.2 to 24 h.

[0021] Optionally, the weight ratio of the polymer to the quantum dots, additives, charge control agent, and solvent I is 1:(0.00005-1):(0.005-0.5):(0.01-0.2):(2-200).

[0022] Optionally, the weight ratio of the polymer to the quantum dot precursor, additive, charge control agent, and solvent I is 1:(0.00005-1):(0.005-0.5):(0.01-0.2):(2-200).

[0023] According to another aspect of the present application, another method for preparing the above-mentioned quantum dot-based electrophoretic particles is provided, characterized in that it comprises the following steps:

[0024] The quantum dots or quantum dot precursors are mixed with raw materials containing additives, charge control agents, and solvent I to obtain an impregnation solution, the polymer microspheres are dispersed and immersed in the impregnation solution for swelling, and the quantum dot-based electrophoretic particles are obtained after filtering and drying.

[0025] Optionally, the swelling conditions are: polymer microsphere concentration 0.5-20wt%, swelling adsorption time 1-12h

[0026] Optionally, the drying conditions are: drying temperature of 60 to 120° C., and drying time of 1 to 24 hours.

[0027] Optionally, the weight ratio of the quantum dots to the additive auxiliary agent, the charge control agent, and the solvent I is 1:(0.005-0.5):(0.01-0.2):(2-200).

[0028] Optionally, the weight ratio of the quantum dot precursor to the additive, the charge control agent, and the solvent I is 1:(0.005-0.5):(0.01-0.2):(2-200).

[0029] According to another aspect of the present application, another method for preparing the above-mentioned quantum dot-based electrophoretic particles is provided, characterized in that it comprises the following steps:

[0030] The quantum dots or quantum dot precursors are mixed with raw materials containing monomer molecules for preparing polymer microspheres, additives, charge control agents, and solvent I, and then added to a solution containing a surfactant and solvent II, heated for emulsification, filtered, and dried to obtain the quantum dot-based electrophoretic particles.

[0031] Optionally, the heating emulsification condition is: reacting at a temperature of 40 to 95° C. for 1 to 24 hours.

[0032] Optionally, the drying conditions are: drying temperature is 80-120° C., and drying time is 0.5-24 h.

[0033] Optionally, the surfactant is selected from at least one of higher fatty acid salts, sulfates, aliphatic sulfonates, quaternary ammonium salts, lecithins, amino acids, fatty acid sorbitans, and polysorbates.

[0034] Optionally, the weight ratio of the quantum dots to the monomer molecules, additives, charge control agents, solvent I, surfactants, and solvent II is

[0035] 1:(1~200000):(0.005~0.5):(0.01~0.2):(5~500000):(0.01~20000):(5~5000000).

[0036] Optionally, the weight ratio of the quantum dot precursor to the monomer molecule, additive, charge control agent, solvent I, surfactant, and solvent II is

[0037] 1:(1~200000):(0.005~0.5):(0.01~0.2):(5~500000):(0.01~20000):(5~5000000).

[0038] Optionally, the solvent I is selected from at least one of ethyl acetate, toluene, n-hexane, ethanol, dimethylformamide, propylene glycol monomethyl ether, propylene glycol diethyl ester, water, butanone, and tetrahydrofuran.

[0039] Optionally, the solvent II is selected from at least one of ethyl acetate, toluene, n-hexane, ethanol, dimethylformamide, propylene glycol monomethyl ether, propylene glycol diethyl ester, water, butanone, and tetrahydrofuran.

[0040] Optionally, the quantum dot precursor comprises:

[0041] At least one of halides, stearates, carbonates, and fatty acid salts of group IA elements; and halides, stearates, carbonates, and fatty acid salts of group IVA and VA elements; and

[0042] Salts formed by halogen ions and aliphatic amines.

[0043] Optionally, the halide of the Group IA element is one of lithium, sodium, potassium, rubidium and cesium.

[0044] Optionally, the halide of the IVA and VA group elements is one of lead, tin, bismuth and antimony.

[0045] According to another aspect of the present application, a microcapsule is provided, wherein at least one of the quantum dot-based electrophoretic particles according to any one of claims 1 to 4 is dispersed in the core material of the microcapsule.

[0046] Optionally, the core material of the microcapsule includes at least one quantum dot-based electrophoretic particle having different internal quantum dot materials.

[0047] In the present application, the specific conditions, specific raw materials used, and specific steps in the method for preparing electrophoretic particles and microcapsules are not strictly limited. Those skilled in the art can select specific preparation conditions and raw materials based on the existing technology or quantum dot-related patents applied for by the applicant.

[0048] According to another aspect of the present application, there is also provided an application of the above-mentioned microcapsule in electronic paper, wherein the electronic paper comprises a high-saturation color microcapsule electrophoretic display module;

[0049] The high-saturation color microcapsule electrophoretic display module includes an electronic ink layer;

[0050] The electronic ink layer includes the above-mentioned microcapsules.

[0051] The beneficial effects of this application include:

[0052] (1) The quantum dot-based electrophoretic particles provided in the present application use polymer microspheres that encapsulate or adsorb quantum dots as electrophoretic particles in structure, with moderate particle size and excellent dispersion performance. Polar molecules can be grafted on the surface to make the surface positively or negatively charged. At the same time, due to the excellent light absorption performance of quantum dots and the ability to emit fluorescence with a narrow half-peak width after being excited by ultraviolet light / blue light, they can be applied to electronic paper modules to achieve a color display effect with a higher color gamut. At the same time, in a dark environment, by adding weak light sources such as blue light or ultraviolet light to excite, a fluorescent display effect can be achieved. The quantum dots are tightly encapsulated in the polymer microspheres. On the one hand, the polymer microspheres can regulate their surface charge by simple methods to achieve charged particles. On the other hand, the microspheres can achieve the optimal electrophoretic effect by controlling the size and morphology. At the same time, the polymer microspheres also play a protective role such as water and oxygen barrier on the quantum dots encapsulated therein, greatly improving the life of the quantum dots and ultimately meeting the display application requirements.

[0053] (2) In the microcapsule structure using the electrophoretic particles provided by the present application, one or more electrophoretic particles of black, white, red, green, yellow, blue, etc. exist in the same microcapsule at the same time, each carrying different types or concentrations of positive and negative charges, and the up and down movement of multiple particles can be controlled under different electric field states, thereby combining into different colors. During processing, only one type of microcapsules needs to be evenly arranged and coated in the film, which greatly reduces the process difficulty and process cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Schematic diagram of the structure of the electrophoretic particle in this application.

[0055] Figure 2Schematic diagram of the microcapsule structure in this application.

[0056] Figure 3 This is a schematic diagram of the structure of a microcapsule electrophoretic display module using the electrophoretic particles in Example 1 of the present application.

[0057] Figure ID

[0058] 1. polymer microspheres; 2. quantum dots; 3. charge regulator; 4. additives; 5. electrophoretic particles; 51. first electrophoretic particles; 52. second electrophoretic particles; 53. third electrophoretic particles; 54. fourth electrophoretic particles; 6. microcapsules; 7. transparent film; 8. electronic ink layer; 9. transparent electrode; 10. pixel electrode; 11. electrode backplane. DETAILED DESCRIPTION

[0059] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0060] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0061] According to one embodiment of the present application, the structure of the electrophoretic particle is shown as follows: Figure 1 As shown, the charge regulator, additive, and quantum dots are independently dispersed and encapsulated in the polymer microsphere matrix; the microcapsule structure including the electrophoretic particles is as shown Figure 2 As shown in the figure, the core material of the microcapsule includes at least one electrophoretic particle with different quantum dots. When used for four-color display, four kinds of microcapsules are used. Each of the four microcapsules contains one kind of electrophoretic particle. The difference lies in the different quantum dots 1 to 4 contained. When the above electrophoretic particles or microcapsules are applied to electronic paper, the microcapsule electrophoretic display module structure of the electronic paper is as shown in the attached figure. Figure 3 As shown, a transparent film, a transparent electrode, an electronic ink layer, a pixel electrode, and an electrode backplane are sequentially stacked, wherein the dot ink uses microcapsules containing the electrophoretic particles of the present application to achieve high-saturation color.

[0062] In the present application, the specific conditions, specific raw materials used, and specific steps in the method for preparing electrophoretic particles and microcapsules are not strictly limited. Those skilled in the art can select specific preparation conditions and raw materials based on the existing technology or quantum dot-related patents applied for by the applicant.

[0063] Example 1 Preparation of electrophoretic particles based on the spray drying method of quantum dot raw materials

[0064] Step 1: Evenly mix 2 g of green light cadmium selenide quantum dots, 100 g of polystyrene polymer, 0.1 g of silicone defoamer, 0.5 g of charge control agent BONTRON N-75 and 1000 g of toluene solvent;

[0065] Step 2: Prepare electrophoretic particle powder through a spray drying process, wherein the gas-liquid ratio of atomization is 0.5:1, the feed amount is 5 L / min, the drying chamber temperature is 80°C, the air volume is 6 cubic meters / hour, the electrophoretic particle powder is collected by a cyclone and post-processed, the post-processing drying temperature is 120°C, and the post-processing drying time is 0.2 hours to obtain the product.

[0066] Example 2 Preparation of electrophoretic particles based on the swelling and drying method of quantum dot raw materials

[0067] Step 1: Evenly mix 1g of red light indium phosphide quantum dots, 0.2g of surfactant sodium dodecylbenzene sulfonate, 0.1g of charge control agent BONTRON P-51, etc. with 200g of ethanol solvent;

[0068] Step 2: Disperse 10 g of polystyrene polymer microspheres in the above solution, and allow the polymer microspheres to swell and absorb the solution under stirring for 2 hours;

[0069] Step 3: separating the swollen polymer microspheres from the solution by filtering or centrifuging;

[0070] Step 4: Dry the swollen polymer microspheres to remove the solvent and form electrophoretic particles loaded with quantum dots, wherein the drying temperature is 90° C. and the drying time is 4 hours.

[0071] Example 3 Preparation of electrophoretic particles based on emulsion polymerization of quantum dot raw materials

[0072] Step 1: Disperse 1 g of red light copper indium sulfur quantum dots, 100 g of methyl methacrylate monomer, 0.05 g of thermal initiator azobisisobutyronitrile and 0.04 g of charge control agent BONTRON S-34 in 500 g of solvent 1 toluene;

[0073] Step 2: fully disperse and emulsify the above 600g mixture solution and 2000g solvent 2 deionized water with 10g surfactant molecule sodium dodecyl sulfate to form an emulsion with solvent 1 toluene as the dispersed phase and solvent 2 deionized water as the continuous phase;

[0074] Step 3: allowing the polymer monomers in the colloidal particles in the emulsion to react and polymerize at 75° C. for 2 hours to form polymer microspheres, which are coated with quantum dots, additives and charge control agents;

[0075] Step 4: Separate the product by filtration, centrifugation, etc., and then wash and dry to obtain electrophoretic particles.

[0076] Example 4 Preparation of electrophoretic particles based on the spray drying method of quantum dot precursor raw materials

[0077] Step 1: Evenly mix 1g of quantum dot precursor lead bromide, 1g of quantum dot precursor cesium bromide, 100g of polymethyl methacrylate, 0.3g of antioxidant BHT, 0.5g of charge control agent BONTRON E-108 and 900g of solvent dimethylformamide;

[0078] Step 2: Prepare electrophoretic particle powder by spray drying process, wherein the gas-liquid ratio of atomization is 5:1, the feed amount is 1L / min, the drying chamber temperature is 100°C, the air volume is 1 cubic meter / hour, the electrophoretic particle powder is collected by cyclone and post-processed, the post-processing drying temperature is 110°C, and the post-processing drying time is 0.5 hours to obtain the product. During the drying process, the quantum dot precursor molecules grow into quantum dots in situ in the polymer microspheres.

[0079] Example 5 Preparation of electrophoretic particles based on the swelling and drying method of quantum dot precursor raw materials

[0080] Step 1: Evenly mix 1g of quantum dot precursor lead bromide, 1g of quantum dot precursor methylamine iodide, 0.5g of leveling agent BYK-333, 0.5g of charge control agent BONTRON E-304 and 900g of solvent tetrahydrofuran;

[0081] Step 2: Disperse 40 g of polyacrylonitrile microspheres in the above solution, and allow the polymer microspheres to swell and absorb the solution for 3 hours;

[0082] Step 3: separating the swollen polymer microspheres from the solution by filtering or centrifuging;

[0083] Step 4: Dry the swollen polymer microspheres (during the drying process, the quantum dot precursor molecules crystallize and grow into quantum dots), remove the solvent, and form electrophoretic particles loaded with quantum dots. The drying temperature is 80° C. and the drying time is 12 hours.

[0084] Example 6 Preparation of electrophoretic particles based on emulsion polymerization of quantum dot precursor raw materials

[0085] Step 1: Disperse 1 g of quantum dot precursor tin iodide, 0.5 g of quantum dot precursor formamidine bromide, 200 g of styrene monomer, 0.01 g of thermal initiator benzoyl peroxide and 0.3 g of charge control agent BONRTON N-77 in 300 g of solvent 1 n-hexane;

[0086] Step 2: fully dispersing and emulsifying 500 g of the above mixture solution and 5000 g of solvent 2 methanol containing 10 g of surfactant molecule fatty acid sorbitan to form an emulsion with solvent 1 toluene as the dispersed phase and solvent 2 methanol as the continuous phase;

[0087] Step 3: The polymer monomers in the colloidal particles in the emulsion are reacted and polymerized at 60° C. for 12 hours to form polymer microspheres; while the polymer is reacting and polymerizing, the quantum dot precursor molecules nucleate and grow into quantum dots.

[0088] Step 4: Separate the product by filtering, centrifuging, etc., and then wash and dry to obtain electrophoretic particles, wherein the drying temperature is 110° C. and the drying time is 12 hours.

[0089] The preparation methods in Examples 1 to 6 of the present application can all obtain the attached Figure 1 The structure of the electrophoretic particles shown in the figure can be applied to a microcapsule display module to achieve a high-saturation color display effect. At the same time, it has a stimulated emission fluorescence effect, which can achieve the effect of clearly displaying content in an environment with weak ambient light.

[0090] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A quantum dot-based electrophoretic particle, characterized in that: Including polymer microspheres, quantum dots, charge regulators, additives; The charge regulator, additive and quantum dots are independently dispersed and encapsulated in the polymer microsphere matrix.

2. The quantum dot-based electrophoretic particle according to claim 1, characterized in that: The particle size of the polymer microspheres is 100 to 50000 nm; Preferably, the weight ratio of polymer microspheres to quantum dots is 1:0.00005-1; Preferably, the weight ratio of polymer microspheres to charge regulator is 1:0.01 to 0.2; Preferably, the weight ratio of the polymer microspheres to the additive is 1:0.005-0.

5.

3. The quantum dot-based electrophoretic particle according to claim 1, characterized in that: The charge regulator is adsorbed on the surface of the polymer microspheres by grafting; Preferably, the material of the polymer microspheres is at least one selected from polytetrafluoroethylene, polyvinylidene fluoride, polystyrene, polymethyl methacrylate, polycarbonate, polyethylene, polypropylene, polyetheretherketone, polyurethane, polyacrylonitrile, polyacrylamide, polyvinyl pyrrolidone, polyethylene glycol, polyvinyl alcohol, polyvinyl acetate, and ethylene-vinyl acetate copolymer; Preferably, the charge regulator is selected from at least one of nigrosine, quaternary ammonium salts, azo metal complexes, tert-butyl salicylic acid metal complexes, benzilic acid complexes, calix aromatic ring derivatives, and resin-type charge regulators; Preferably, the additive is selected from at least one of a surfactant, a leveling agent, a defoaming agent, an antioxidant, a diffusant, and a water absorbent.

4. The quantum dot-based electrophoretic particle according to claim 1, characterized in that: The quantum dots include at least one of cadmium selenide quantum dots, cadmium telluride quantum dots, copper indium sulfide quantum dots, indium phosphide quantum dots, perovskite quantum dots, carbon quantum dots, graphene quantum dots, cuprous sulfide quantum dots, and zinc selenide quantum dots.

5. The method for preparing quantum dot-based electrophoretic particles according to any one of claims 1 to 4, characterized in that: The steps include: The quantum dots or quantum dot precursors are mixed with raw materials containing polymers, additives, charge control agents, and solvent I, and spray-dried to prepare the quantum dot-based electrophoretic particles.

6. The method for preparing quantum dot-based electrophoretic particles according to any one of claims 1 to 4, characterized in that: The steps include: The quantum dots or quantum dot precursors are mixed with raw materials containing additives, charge control agents, and solvent I to obtain an impregnation solution, the polymer microspheres are dispersed and immersed in the impregnation solution for swelling, and the quantum dot-based electrophoretic particles are obtained after filtering and drying.

7. The method for preparing quantum dot-based electrophoretic particles according to any one of claims 1 to 4, characterized in that: The steps include: The quantum dots or quantum dot precursors are mixed with raw materials containing monomer molecules for preparing polymer microspheres, additives, charge control agents, and solvent I, and then added to a solution containing a surfactant and solvent II, heated for emulsification, filtered, and dried to obtain the quantum dot-based electrophoretic particles.

8. A microcapsule, characterized in that At least one of the quantum dot-based electrophoretic particles according to any one of claims 1 to 4 is dispersed in the core material of the microcapsule.

9. The microcapsule according to claim 8, characterized in that The core material of the microcapsule includes at least one quantum dot-based electrophoretic particle having different internal quantum dot materials.

10. Use of the microcapsule according to claim 8 or 9 in electronic paper, characterized in that: The electronic paper includes a high-saturation color microcapsule electrophoretic display module; The high-saturation color microcapsule electrophoretic display module includes an electronic ink layer; The electronic ink layer comprises at least one microcapsule according to claim 8 or 9.

Images