Polymer light-emitting material for diode display and preparation method thereof

Abstract

The application discloses a kind of polymer light-emitting materials for diode display and preparation method thereof, it is related to polymer preparation technical field, the present application includes accurately taking luminous monomer, flexible monomer, initiator and other raw materials, preparation emulsifier solution and oil phase solvent;Oil phase monomer is mixed with emulsifier water phase, and uniform transparent microemulsion system is formed by gradient stirring;Initiator and crosslinking agent are injected into microemulsion, are transferred to reaction kettle and control filling ratio;Three-stage temperature program is used, and the growth of molecular weight gradient distribution star structure is realized;The core-shell structure luminous powder with particle size <50 μm is obtained by ethanol demulsification, centrifugal separation, washing and drying and grinding;The present application realizes the gradient control of molecular chain growth by hydrothermal auxiliary microemulsion system, constructs the star topological structure with clear core-shell, so that material has high luminous efficiency and stress buffering capacity.

Description

Technical Field

[0001] This invention belongs to the field of polymer preparation technology, and in particular relates to a polymer light-emitting material for diode displays and its preparation method. Background Technology

[0002] Polymer light-emitting materials (PLCs) are a class of polymeric compounds with conjugated structures that achieve photoluminescence or electroluminescence through the delocalization of π electrons. Compared with traditional inorganic light-emitting materials (such as GaN in LEDs), their advantages lie in solution-processability (e.g., spin coating, inkjet printing), adaptability to flexible displays, and spectral tunability. In the field of diode displays, PLCs are core components of organic light-emitting diodes (OLEDs) and polymer light-emitting diodes (PLEDs).

[0003] In the preparation of polymer luminescent materials by traditional free radical polymerization, the lack of spatial confinement effect and dynamic control mechanism in the reaction system leads to disordered cross-linking growth of molecular chains, resulting in excessively high chain segment entanglement density. This structural defect causes the distance between luminescent groups to be too close, triggering exciton nonradiative transitions and energy transfer disorder, resulting in luminescence efficiency decay. To address the above problems, the following solutions are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a polymeric luminescent material for diode displays and its preparation method. By using a hydrothermal-assisted microemulsion system to achieve gradient control of molecular chain growth, a star-shaped topology with distinct core and shell is constructed, which solves the problem of exciton quenching caused by chain entanglement in existing homogeneous polymerization.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a method for preparing a polymer light-emitting material for diode displays, comprising the following steps:

[0007] Step S1, Raw material preparation: Weigh tetraphenylethylene derivative as luminescent monomer, weigh butyl acrylate as flexible monomer, prepare ammonium persulfate as water-soluble initiator, measure n-heptane as oil phase solvent, prepare an aqueous emulsifier containing sodium dodecyl sulfate, and prepare ethylene glycol dimethacrylate as crosslinking agent.

[0008] Step S2, Microemulsion preparation: Mix tetraphenylethylene derivative and butyl acrylate, add n-heptane and stir with a magnetic stirrer until completely dissolved, add emulsifier aqueous solution dropwise and stir continuously to form a transparent microemulsion system;

[0009] Step S3, Construction of hydrothermal reaction system: Dissolve ammonium persulfate in deionized water, slowly inject the initiator solution into the microemulsion system, reduce the stirring speed, add crosslinking agent ethylene glycol dimethacrylate, transfer the mixture to a polytetrafluoroethylene-lined reactor, and control the filling degree;

[0010] Step S4, gradient polymerization reaction: Place the reactor in an oven and react in stages with controlled temperature. In the first stage, maintain the temperature at 60°C for 2 hours. In the second stage, increase the temperature to 80°C at 1°C / min and maintain it for 3 hours. In the third stage, increase the temperature to 100°C at 0.5°C / min and maintain it for 1 hour. Allow it to cool naturally to room temperature.

[0011] Step S5, Post-processing: Take out the product solution, add an equal volume of ethanol / water mixture to demulsify, centrifuge to collect the precipitate, wash with ethanol, place the product in a vacuum drying oven to dry, and grind it into powder with a particle size of less than 50μm.

[0012] Furthermore, the amounts of each raw material used in the preparation of the raw materials are as follows: 0.5g tetraphenylethylene derivative, 3mL butyl acrylate, 0.2g ammonium persulfate, 15mL n-heptane, 20mL emulsifier aqueous solution containing 5wt% sodium dodecyl sulfate, and 0.05g ethylene glycol dimethacrylate.

[0013] Furthermore, during the preparation of the microemulsion, the oil-to-water ratio is precisely controlled at 3:7, the dripping rate of the added emulsifier aqueous solution is 1 mL / min, the stirring speed is 500 rpm, and the stirring time is 30 minutes.

[0014] Furthermore, when the initiator is added, the system temperature is maintained at 25±1℃, the stirring speed is reduced to 200 rpm, and the filling degree of the reactor is controlled at 70%.

[0015] Furthermore, the temperature error at each stage of the hydrothermal reaction is ≤ ±1℃.

[0016] Furthermore, the centrifugation operation is carried out at a low temperature of 4°C, with centrifugation at 8000 rpm for 10 minutes.

[0017] Furthermore, the drying conditions are 50°C for 12 hours, and the amount of washing liquid used each time is 3 times the volume of the precipitate.

[0018] Furthermore, this material is a star-shaped polymer luminescent material with a core-shell structure, exhibiting a pale yellow metallic luster on its surface. The final product has a water content of <0.5%, and features a gradient molecular star distribution and cross-linked structure. Its characteristic structural formula is Core-(PBA-co-EGDMA). nIn this context, Core is a tetraphenylethylene derivative (TPE-based unit) with a structure consisting of a tetraphenylethylene core containing four polymerizable groups: (CH2=CHCOO)4-TPE-(OCOCH2CH2CH2CH3)4, PBA is a polybutyl acrylate repeating unit: -(CH2-CH(COOCH2CH2CH2CH3))-, and EGDMA is the ethylene glycol dimethacrylate crosslinking point: -O-CO-C(CH3)=CH2-[CH2].

[0019] Furthermore, the star-shaped structure of the luminescent material uses tetraphenylethylene as a rigid luminescent core, with polymer chains extending outward through four acrylate groups; the gradient molecular weight is controlled by hydrothermal staged heating to control the chain growth rate, forming a gradient distribution of increasing molecular weight from the core to the shell; the crosslinking network is formed by intermolecular crosslinking generated by EGDMA during polymerization, forming a three-dimensional network structure.

[0020] Furthermore, this material is used in the light-emitting layer of polymer electroluminescent diodes.

[0021] The present invention has the following beneficial effects:

[0022] 1. This invention achieves gradient control of molecular chain growth through a hydrothermal-assisted microemulsion system, constructing a star-shaped topology with distinct core and shell. The confinement effect of the microemulsion interface and the synergistic effect of the hydrothermal environment enable the spatial orientation of chain segments with different molecular weights. A rigid framework with high cross-linking degree is formed in the core region, while flexible branches with decreasing molecular weight extend from the periphery. This structural feature enables the material to have both high luminescence efficiency and stress buffering capacity, preventing exciton quenching caused by chain entanglement in homogeneous polymerization. At the same time, the penetration and diffusion of the cross-linking agent at high temperature forms a three-dimensional network, ensuring structural stability.

[0023] 2. This invention uses a water-based microemulsion system to replace organic solvent media, which can effectively reduce the emission of volatile organic compounds; the closed environment of the hydrothermal reactor effectively blocks oxygen interference, avoids the nitrogen protection process required for conventional emulsion polymerization, simplifies operation and improves inherent safety; the nanoreactor characteristics of the microemulsion optimize the monomer diffusion path, reduce the reaction activation energy, and can complete polymerization in a mild temperature range, reducing energy consumption costs.

[0024] 3. The gradient molecular weight distribution of this invention promotes the orderly arrangement of luminescent groups at the ends of star-shaped molecular arms, forming energy transfer channels and enhancing the exciton confinement effect; the outer low molecular weight chain segments form a dense protective layer, blocking the penetration of moisture and oxygen, so that the material maintains stable luminescence performance in humid and hot environments; the core cross-linking network inhibits the thermal motion of molecular chains, increases the glass transition temperature, and avoids phase separation during high-temperature applications; this design solves the contradiction between the efficiency and stability of luminescent materials, and while maintaining high quantum yield, the material can withstand long-term light exposure and temperature cycling.

[0025] 4. This invention achieves the directional evolution of nanoscale micelles into submicron-sized particles by dynamically controlling the interfacial tension of microemulsions in a hydrothermal environment; uniform crystal nuclei are formed in the initial low-temperature stage of the reaction, and the growth rate of molecular chains is controlled during the gradient heating process, ultimately obtaining spherical microparticles with monodispersity; the particle surface is spontaneously wrapped by flexible chain segments to form a smooth interface, which can reduce light scattering loss.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the preparation process of a polymer light-emitting material for diode displays according to the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1 As shown, this invention discloses a method for preparing a polymer light-emitting material for diode displays, comprising the following steps:

[0031] Step S1, Raw material preparation: Weigh 0.5g of tetraphenylethylene derivative as the luminescent monomer; measure 3mL of butyl acrylate as the flexible monomer; prepare 0.2g of ammonium persulfate as the water-soluble initiator; measure 15mL of n-heptane as the oil phase solvent; prepare 20mL of an emulsifier aqueous solution containing 5wt% sodium dodecyl sulfate; prepare 0.05g of ethylene glycol dimethacrylate as the crosslinking agent.

[0032] Step S2, Microemulsion Preparation: Mix tetraphenylethylene derivative and butyl acrylate in a 50 mL beaker; add n-heptane and place on a magnetic stirrer, stirring at 500 rpm until completely dissolved; add emulsifier aqueous solution dropwise, controlling the dropping rate at 1 mL / min; continue stirring for 30 minutes to form a transparent microemulsion system.

[0033] Step S3, Construction of hydrothermal reaction system: Dissolve ammonium persulfate in 5 mL of deionized water; slowly inject the initiator solution into the microemulsion system, and reduce the stirring speed to 200 rpm; add crosslinking agent ethylene glycol dimethacrylate; transfer the mixture to a 100 mL polytetrafluoroethylene-lined reactor, and control the filling degree to 70%;

[0034] Ammonium persulfate decomposes under heating conditions to produce sulfate free radicals:

[0035]

[0036] Ethylene glycol dimethacrylate (EGDMA) forms a cross-linked network:

[0037]

[0038] Step S4, gradient polymerization reaction: Place the reactor in an oven. First stage: 60℃ for 2 hours; Second stage: Increase the temperature to 80℃ at 1℃ / min and hold for 3 hours; Third stage: Increase the temperature to 100℃ at 0.5℃ / min and hold for 1 hour; Allow to cool naturally to room temperature (approximately 25℃).

[0039] Tetraphenylethylene derivative (TPE-MA4) participates in the initiation as a tetrafunctional monomer:

[0040]

[0041] Free radical-initiated polymerization of butyl acrylate (BA) monomers:

[0042]

[0043] Free radical recombination termination:

[0044] Polymer chain · + polymer chain → polymer chain - polymer chain.

[0045] Step S5, Post-processing: Open the reactor and remove the product solution; add an equal volume of ethanol / water mixture (volume ratio 1:1) to demulsify; centrifuge at 8000 rpm for 10 minutes to collect the precipitate; wash three times with ethanol, each time using 3 times the volume of the precipitate; place the product in a vacuum drying oven and dry at 50℃ for 12 hours; grind with a mortar and pestle to obtain a powder with a particle size <50μm to obtain a star-shaped polymer luminescent material with a core-shell structure, exhibiting a pale yellow metallic luster on the surface, and the final product has a water content <0.5%;

[0046] In the above steps, the ambient temperature of all operations is controlled at 20-25℃ and the relative humidity is <40%; the oil-water ratio is precisely controlled at 3:7 when preparing the microemulsion; the system temperature is maintained at 25±1℃ when the initiator is added; the temperature error of each stage of the hydrothermal reaction is ≤±1℃; and the centrifugation operation is carried out in a low-temperature environment of 4℃.

[0047] One specific application of this embodiment is:

[0048] 1. Raw material preparation and pretreatment:

[0049] Treatment of luminescent monomers: Weigh 0.500g±0.001g of tetraphenylethylene tetraacrylate (TPE-MA4, CAS217045-83-3, purity ≥99%) and place it in a dry 50mL glass beaker;

[0050] Add 3.00 mL ± 0.05 mL butyl acrylate (BA, purity ≥ 98%) and premix with a magnetic stirrer at 200 rpm for 5 minutes to form a homogeneous mixture;

[0051] Preparation of initiator and crosslinking agent: Weigh 0.200g±0.005g ammonium persulfate (APS, purity ≥99%), dissolve in 5.00mL±0.1mL ultrapure water (resistivity ≥18.2MΩ·cm), sonicate for 10 minutes to prepare a 4wt% initiator solution;

[0052] Measure 0.050g ± 0.001g of ethylene glycol dimethacrylate (EGDMA, purity ≥ 95%), seal and store in a light-proof container for later use;

[0053] Preparation of microemulsion system: Oil phase: Measure 15.00 mL ± 0.1 mL of n-heptane (chromatographic grade) and add it to the mixed monomer solution; Aqueous phase: Prepare 20.00 mL ± 0.2 mL of sodium dodecyl sulfate (SDS) aqueous solution (5.00 wt%), and adjust the pH to 7.0 (titrate with 0.1 M NaOH);

[0054] 2. Microemulsion preparation:

[0055] Emulsification process: The oil phase mixture was placed in a magnetic stirrer (IKARCTBasic) and the speed was set to 500 rpm ± 5 rpm and the temperature to 25.0 ± 0.5℃.

[0056] SDS aqueous phase was added dropwise at a rate of 1.00 mL / min using a constant flow pump (Lange LSP01-1A), and the entire process was carried out in a closed and light-proof manner.

[0057] Stir continuously for 30.0 min ± 1 min to form a transparent microemulsion (particle size < 50 nm, verified by dynamic light scattering);

[0058] System stability test: Visually observe the emulsion transparency; no layering or turbidity should be observed. The conductivity measurement value should be ≤10μS / cm (Mettler FE38 conductivity meter).

[0059] 3. Hydrothermal polymerization reaction:

[0060] Initiator injection and pre-activation: The APS solution was slowly injected into the microemulsion through a syringe, while the stirring speed was reduced to 200 rpm ± 5 rpm and the temperature was maintained at 25.0 ± 0.5℃; 0.050 g of EGDMA crosslinking agent was added and stirred for 5 minutes.

[0061] Hydrothermal reactor filling: Transfer the mixture to a 100mL polytetrafluoroethylene-lined reactor (filling degree 70% ± 2%), seal it and place it in a forced-air drying oven (Jinghong DHG-9070A);

[0062] Gradient temperature polymerization:

[0063] The first stage (low temperature initiation) was conducted at a temperature of 60.0 ± 0.5℃ for a duration of 2.0 h ± 0.1 h.

[0064] Chemical equation:

[0065]

[0066] Second stage (chain growth): Increase the temperature to 80.0±0.5℃ at 1.0℃ / min and hold for 3.0h±0.1h;

[0067] Chemical equation (chain growth):

[0068]

[0069] The third stage (crosslinking and curing): the temperature is increased to 100.0±0.5℃ at a rate of 0.5℃ / min and held for 1.0h±0.1h;

[0070] Chemical equation (crosslinking): Polymer chain + EGDMA → crosslinked network;

[0071] 4. Post-processing and product collection:

[0072] Demulsification and precipitation: After the reaction solution was cooled to room temperature, 25.0 mL ± 0.5 mL of ethanol / water mixture (1:1 v / v) was added, and the mixture was magnetically stirred for 10 minutes to demulsify.

[0073] Centrifugation and washing: Centrifuge at 4.0±0.5℃ and 8000rpm±50rpm for 10.0min±0.5min using a high-speed centrifuge (Sigma 3-18KHS), and discard the supernatant;

[0074] The precipitate was washed three times with 15 mL of anhydrous ethanol (purity ≥99.7%), and ultrasonically dispersed for 5 minutes each time.

[0075] Drying and pulverizing: The product was transferred to a vacuum drying oven (DZF-6020), set at 50.0±1.0℃ and a vacuum degree of -0.095MPa, and dried for 12.0h±0.5h;

[0076] After drying, the product was ground in an agate mortar until D50 < 50 μm (verified with Mastersizer 3000);

[0077] 5. Product characterization:

[0078] Morphology and structure: Scanning electron microscope (SEM, SU8010): shows core-shell structure, core diameter 20-30nm, shell thickness 5-10nm;

[0079] Infrared spectrum (FTIR, Thermo Nicoleti S50): 1720 cm⁻¹ -1 (C=O stretching vibration), 1630cm -1 (C=C crosslinking peak);

[0080] Performance metrics:

[0081] Moisture content: 0.45% ± 0.05% (Karl Fischer moisture analyzer);

[0082] Fluorescence quantum yield: 62% ± 3% (integrating sphere method, excitation wavelength 365 nm).

[0083] Applications of the luminescent materials obtained in the above embodiments:

[0084] 1. Material and Device Fabrication:

[0085] Preparation of luminescent layer solution: Take 10.0 mg ± 0.1 mg of the polymer luminescent material obtained in the above example, dissolve it in 1.00 mL ± 0.05 mL of chlorobenzene (purity ≥ 99.9%), stir magnetically for 24 h (25℃, 500 rpm) to prepare a 10 mg / mL homogeneous solution, and filter it through a 0.22 μm polytetrafluoroethylene filter membrane for later use;

[0086] OLED device structure: Substrate: ITO glass (sheet resistance ≤15Ω / sq, pre-treated with UV ozone for 15 minutes); Hole transport layer (HTL): spin-coated PEDOT:PSS (thickness ≈40nm, 3000rpm×30s); Emitting layer (EML): spin-coated solution of the above luminescent material (thickness ≈80nm, 1500rpm×30s); Electron transport layer (ETL): vacuum-deposited TPBi (thickness ≈30nm, 1500rpm×30s). Cathode: Evaporated LiF (1nm) / Al (100nm);

[0087] 2. Electroluminescent properties:

[0088] Brightness and current efficiency: A test system was built using a Keithley 2400 source meter and a calibrated silicon photodiode. The fabricated OLED device was placed in a dark room, and a driving voltage of 3 to 10V was applied stepwise (in 0.1V steps). The current value and light output intensity of the device were recorded in real time. The luminous intensity (unit: cd / m²) was captured by the silicon photodiode. 2 The current efficiency (cd / A) was calculated by combining the current data; the test results showed that the device reached a maximum brightness of 12,500 cd / m² at 8.5V. 2 And at a brightness of 1000 cd / m 2 At that time, the current efficiency was 8.6 cd / A;

[0089] External quantum efficiency (EQE) measurement: An integrating sphere system was used in conjunction with a spectrometer. The device was fixed at the center of the integrating sphere, and a constant current density of 10 mA / cm² was applied. 2 Under excited emission, the emission spectrum was collected by a spectrometer, and the ratio of photon generation efficiency to injected charge was calculated to obtain the external quantum efficiency (EQE). The test results show that at 1000 cd / m², the external quantum efficiency is [value missing]. 2 At the specified brightness, the EQE reaches 3.8%, indicating that the material has a high photoelectric conversion efficiency.

[0090] Color coordinates and color purity testing: A spectroradiometer was used at a driving voltage of 6V (corresponding to a brightness of approximately 5000 cd / m²). 2 The emission spectrum of the device was measured, and the coordinate values ​​of the emitted color (x = 0.28, y = 0.32) were calculated using the CIE 1931 standard colorimetric system. Furthermore, its color purity was calculated based on the color gamut coverage, and the result showed 92% (with the NTSC green area as a reference), indicating that the green light emitted by the material is pure and meets the requirements of display applications.

[0091] Lifetime testing: The device was connected to the OLED lifetime testing system and subjected to a constant current density of 50 mA / cm². 2 Continuous operation, initial brightness set to 1000 cd / m² 2 The brightness decay is monitored in real time using a light sensor; when the brightness drops to 50% of the initial value, the time is recorded to obtain the device lifetime index T. 50 The test lasted approximately 1500 hours, demonstrating the material's excellent stability under high load conditions, making it suitable for long-term display in commercial applications.

[0092] 3. Diode display application verification

[0093] Pixelated device fabrication: A 100μm×100μm pixel array was fabricated on an ITO substrate using photolithography; the light-emitting layer was precisely deposited by inkjet printing (Fujifilm Dimatix DMP-2850) with a droplet volume of 10pL and a positioning accuracy of ±2μm.

[0094] Display performance test:

[0095] Contrast ratio: Static contrast ratio 10,000:1 (full brightness / full darkness);

[0096] Response time: rise time 0.8ms, fall time 1.2ms (@60Hz refresh rate);

[0097] Viewing angle characteristics: Viewing angle ≥160° (horizontal / vertical direction) when brightness decays to 50%;

[0098] 4. Explanation of the correlation between key mechanisms:

[0099] Gradient molecular weight enhances carrier balance: the rigid structure of the star core (TPE) provides hole transport channels; the outer flexible chain (PBA) reduces electron trap density and minimizes exciton quenching;

[0100] Cross-linked network enhances stability: EGDMA cross-linking inhibits molecular chain thermal motion and extends device lifetime (T). 50 >1500 hours);

[0101] The summary is shown in the table below:

[0102]

[0103] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a polymer light-emitting material for diode displays, characterized in that, The preparation method includes the following steps: Step S1, Raw material preparation: Weigh 0.5g tetraphenylethylene tetraacrylate as the luminescent monomer, weigh 3mL butyl acrylate as the flexible monomer, prepare 0.2g ammonium persulfate as the water-soluble initiator, measure 15mL n-heptane as the oil phase solvent, prepare 20mL of emulsifier aqueous solution containing 5wt% sodium dodecyl sulfate, adjust the pH of the emulsifier aqueous solution to 7.0, and prepare 0.05g ethylene glycol dimethacrylate as the crosslinking agent; Step S2, Microemulsion Preparation: Tetraphenylethylene tetraacrylate and butyl acrylate are mixed, and n-heptane is added. The mixture is then placed in a magnetic stirrer and stirred at 500 rpm until completely dissolved. An aqueous emulsifier solution is added dropwise at a rate of 1 mL / min, with the oil-to-water ratio precisely controlled at 3:

7. The mixture is stirred continuously for 30 minutes to form a transparent microemulsion system. The droplet size of the transparent microemulsion system is less than 50 nm. Step S3, Construction of hydrothermal reaction system: Dissolve ammonium persulfate in deionized water, slowly inject the initiator solution into the microemulsion system, reduce the stirring speed, add crosslinking agent ethylene glycol dimethacrylate, transfer the mixture to a polytetrafluoroethylene-lined reactor, control the filling degree, and seal the reactor. Step S4, gradient polymerization reaction: Place the reactor in an oven and react in stages with controlled temperature. In the first stage, maintain the temperature at 60°C for 2 hours. In the second stage, increase the temperature to 80°C at 1°C / min and maintain it for 3 hours. In the third stage, increase the temperature to 100°C at 0.5°C / min and maintain it for 1 hour. Allow it to cool naturally to room temperature. Step S5, Post-processing: Take out the product solution, add an equal volume of ethanol / water mixture to demulsify, centrifuge to collect the precipitate, wash with ethanol, place the product in a vacuum drying oven to dry, and grind it into powder with a particle size of less than 50μm.

2. The method for preparing a polymer light-emitting material for diode displays according to claim 1, characterized in that, When the initiator is added, the system temperature is maintained at 25±1℃, the stirring speed is reduced to 200 rpm, and the filling degree of the reactor is controlled at 70%.

3. The method for preparing a polymer light-emitting material for diode displays according to claim 1, characterized in that, The centrifugation operation was carried out at a low temperature of 4°C for 10 minutes at 8000 rpm.

4. The method for preparing a polymer light-emitting material for diode displays according to claim 1, characterized in that, The drying conditions are 50°C for 12 hours, and the washing liquid used each time is 3 times the volume of the precipitate.

5. The polymer luminescent material prepared by the method according to any one of claims 1-4, characterized in that, The material is a crosslinked copolymer of tetraphenylethylene tetraacrylate, butyl acrylate and ethylene glycol dimethacrylate, with a pale yellow metallic luster on the surface, and the final product has a moisture content of <0.5%.

6. The application of the luminescent material according to claim 5, characterized in that, This material is used in the light-emitting layer of polymer electroluminescent diodes.

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