Perovskite quantum dot enhanced diffusion plate and preparation method thereof

Abstract

The invention discloses a perovskite quantum dot enhanced diffusion plate and a preparation method thereof, and relates to the technical field of optical elements. The preparation method comprises the following steps: heating and smelting an inorganic glass raw material and a quantum dot precursor, quenching, cooling, tempering and crystallizing to obtain quantum dot glass, grinding and granulating the quantum dot glass to obtain quantum dot glass powder, mixing modified polymethyl methacrylate, the quantum dot glass powder and diffusion particles, adding the mixture into an injection molding machine, and extruding to obtain the quantum dot glass. And the perovskite quantum dot enhanced diffusion plate is obtained. Methyl methacrylate is modified, so that the problem that charge is greatly hindered when being transmitted between quantum dots and methyl methacrylate is solved, and the luminous efficiency of the diffusion plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical elements, and in particular to a perovskite quantum dot enhanced diffusion plate and a preparation method thereof. Background Art

[0002] In the field of modern display technology and lighting, optical components play a key role in improving display effects and lighting quality. As an emerging optical component, perovskite quantum dot enhanced diffuser has attracted much attention in recent years. It combines the excellent optical properties of perovskite quantum dots with the functions of diffuser, which can effectively improve the propagation characteristics of light, improve the display color gamut, enhance the display effect and make the light distribution more uniform. It shows great application potential in products such as liquid crystal display (LCD), organic light emitting diode display (OLED) and lighting fixtures.

[0003] Perovskite quantum dots have the advantages of narrow emission spectrum, high quantum yield and adjustable emission color. When applied to diffuser plates, they can significantly improve the optical performance of diffuser plates, bringing more vivid color performance and higher light efficiency to display and lighting. However, there are still many challenges in the actual preparation and application process.

[0004] Methyl methacrylate has good optical transparency, easy processing and chemical stability, and is one of the commonly used materials for preparing diffuser plates. However, there is an interfacial charge transfer problem between quantum dots and methyl methacrylate. Due to the differences in their physical and chemical properties, the electron cloud distribution and energy level structure at the interface do not match, resulting in a large obstacle in the transfer of charge between quantum dots and methyl methacrylate. When quantum dots are excited to produce electron-hole pairs, electrons and holes cannot be efficiently transferred to methyl methacrylate, and some charges will recombine on the surface of quantum dots and release energy in a non-radiative form, which greatly reduces the luminous efficiency of the diffuser plate. Summary of the invention

[0005] The purpose of the present invention is to provide a perovskite quantum dot enhanced diffuser and a preparation method thereof, so as to solve the technical problem that the charge transmission between quantum dots and methyl methacrylate encounters a large obstacle. The present invention modifies methyl methacrylate to solve the above-mentioned technical problem, thereby improving the luminous efficiency of the diffuser.

[0006] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1, heating and melting the inorganic glass raw material and the quantum dot precursor, and then quenching, cooling, tempering and crystallizing to obtain quantum dot glass; S2, grinding and granulating the quantum dot glass to obtain quantum dot glass powder; S3, mixing modified polymethyl methacrylate, dot glass powder and diffusion particles, and then adding them into an injection molding machine for extrusion to obtain a perovskite quantum dot enhanced diffusion plate.

[0007] In the technical solution of the present invention, inorganic glass raw materials are heated and melted to form a matrix, which provides a uniform dispersion environment for quantum dot precursors and helps the uniform growth of quantum dots. The quantum dot precursors undergo quenching, cooling, tempering and crystallization to form high-quality perovskite quantum dots with excellent luminous efficiency and stability. The inorganic glass matrix can also protect the quantum dots from external erosion and maintain their long-term luminous performance. The quantum dot glass powder that has been ground and granulated has a micron-scale particle size that gives it a large specific surface area. When mixed with modified polymethyl methacrylate, the interaction between the two can be enhanced. The good fluidity and formability of the granulated powder are conducive to operation in an injection molding machine. Diffusion particles can optimize the light scattering effect, improve the uniformity of light output, and meet the optical requirements of high-end fields.

[0008] Preferably, in step S1, the inorganic glass raw material includes one or more of SiO2, TiO2, Al2O3, and CaCO3.

[0009] Preferably, in step S1, the quantum dot precursor includes one or more of NaBr, CsCO3, and PbSO2.

[0010] Preferably, in step S1, the heating and melting temperature is 1300-1350°C.

[0011] Preferably, in step S2, the particle size of the quantum dot glass after grinding and granulation is controlled to be 5-10 um.

[0012] Preferably, in step S3, the diffusion particles include one or more of nano-silicon dioxide, nano-titanium dioxide, and nano-barium sulfate.

[0013] Preferably, in step S3, the mass ratio of modified polymethyl methacrylate, quantum dot glass powder and diffusion particles is 10:2-3:1-2.

[0014] Preferably, the preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding carbon nanotubes to a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heating and stirring to react, and performing centrifugal separation, washing and drying to obtain carboxylated carbon nanotubes; S32, adding the carboxylated carbon nanotubes to toluene, dispersing them uniformly by ultrasonic oscillation to obtain a suspension, adding thionyl chloride to the suspension, and then adding a catalyst, reacting under heating conditions, removing excess thionyl chloride and toluene by rotary evaporation, and obtaining acyl chloride carbon nanotubes; S33, adding acyl chloride carbon nanotubes to toluene, dispersing them evenly by ultrasonic oscillation to obtain a suspension, adding p-aminostyrene to the suspension, heating and stirring the suspension under nitrogen protection, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34, adding methyl methacrylate and carbon nanotube modified intermediate into toluene, and then adding benzoyl peroxide initiator, dispersing evenly by ultrasonic oscillation, and then transferring into a polymerization tube, heating and reacting under nitrogen protection to obtain modified polymethyl methacrylate.

[0015] In the technical solution of the present invention, due to the large difference in the electronic structure of quantum dot glass powder and methyl methacrylate, under light excitation, the photogenerated carriers (electrons and holes) generated by quantum dots are difficult to be smoothly transferred to methyl methacrylate, and some carriers will recombine at the interface, resulting in a decrease in the luminescence efficiency of quantum dots. Adding carbon nanotubes to the diffuser can effectively improve this situation. Carbon nanotubes have excellent electrical properties and can serve as a bridge for carrier transmission, accelerating the transmission of photogenerated carriers generated by quantum dots to methyl methacrylate, reducing the recombination of carriers at the interface, thereby improving the luminescence efficiency of quantum dots, and enabling the diffuser to present brighter and more vivid colors in applications such as display and lighting.

[0016] However, the team of the present invention has found through experimental research that directly mixing carbon nanotubes with methyl methacrylate and quantum dot glass powder will seriously affect the improvement of the luminous efficiency of the diffuser plate by carbon nanotubes, because carbon nanotubes are prone to agglomeration and displacement. Therefore, the present invention further performs a modified composite treatment between polymethyl methacrylate and carbon nanotubes, and first acidifies the carbon nanotubes to produce carboxyl groups on their surface. Then, dichlorothionyl is used to convert the carboxyl groups into acyl chloride groups, which are then reacted with organic amines containing double bonds to introduce double bond groups. These double bonds can subsequently undergo free radical polymerization with methacrylic acid, so that the carbon nanotubes and methacrylic acid are tightly combined. In this process, the surface properties of the carbon nanotubes change, and the interaction with methacrylic acid is enhanced, which effectively prevents agglomeration, achieves uniform dispersion, and prevents displacement in the matrix, thereby greatly improving the luminous efficiency of the diffuser plate.

[0017] Preferably, in step S34, the mass of the methyl methacrylate and carbon nanotube modified intermediate is The ratio is 100:1.2-1.7.

[0018] In the technical solution of the present invention, the quality of the intermediate of methyl methacrylate and carbon nanotube modification is controlled. The amount ratio is less than 100:1.2, because carbon nanotubes act as a bridge for carrier transmission, accelerating the transmission of photogenerated carriers generated by quantum dots to methyl methacrylate. If the amount of carbon nanotubes added is too little, an effective transmission network cannot be formed, resulting in limited improvement of the luminous efficiency of the carbon nanotubes on the diffusion plate. However, the present invention team has found that when the amount of carbon nanotubes is further increased, that is, when the mass ratio of methyl methacrylate to the carbon nanotube modified intermediate is less than 100:1.7, the brightness of the diffusion plate drops sharply. This may be because there is a difference in the refractive index of carbon nanotubes and the surrounding medium. When light encounters a large number of carbon nanotubes during propagation, it will change the propagation direction, thereby increasing scattering and haze, and reducing the brightness of the diffusion plate. When its amount is kept within a certain range, this effect has little effect on the brightness of the diffusion plate, but when its amount is increased to a certain critical value, this influence is dominant and has a great impact on the brightness of the diffusion plate. Therefore, the present invention simultaneously controls the mass ratio of methyl methacrylate to the carbon nanotube modified intermediate to be greater than 100:1.7.

[0019] A perovskite quantum dot enhanced diffusion plate is prepared by the method described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The matrix formed by melting inorganic glass not only provides a uniform environment for the growth of quantum dots, but also protects the quantum dots to maintain long-term luminescence performance; the quantum dot glass powder is treated to enhance the interaction with modified polymethyl methacrylate, and the diffusion particles improve the uniformity of light output, meeting high-end optical requirements; 2. Carbon nanotubes solve the obstacles to the transmission of charges between quantum dots and methyl methacrylate. Carbon nanotubes act as bridges to accelerate the transmission of photogenerated carriers, reduce interface recombination, significantly improve the luminous efficiency of quantum dots, and present better colors. In addition, the modified composite treatment of polymethyl methacrylate and carbon nanotubes prevents carbon nanotubes from agglomerating and displacing, and achieves uniform dispersion; 3. Reasonably regulate the mass ratio of methyl methacrylate to carbon nanotube modified intermediates to effectively avoid the problem of decreased brightness of the diffusion plate caused by improper use of carbon nanotubes. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the implementation rules described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1. Mix the inorganic glass raw material (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and the quantum dot precursor (mass ratio NaBr:CsCO3:PbSO2=40:30:30) in a mass ratio of 10:1, and then heat to 1325°C for melting, smelt for 2h, quench and cool to 80°C, and then temper and crystallize at 625°C for 3h to obtain quantum dot glass; S2, grinding the quantum dot glass, passing it through a sieve with an aperture of 5-10 um, controlling the particle size of the quantum dot glass to be 5-10 um, and then granulating it to obtain quantum dot glass powder; S3. Evenly mix the modified polymethyl methacrylate, dot glass powder and nano-silicon dioxide (the mass ratio of the three is 10:2.8:1.9), then add them into an injection molding machine and extrude them at 210° C. to obtain a perovskite quantum dot enhanced diffuser plate.

[0023] The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding 3 g of carbon nanotubes to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heating to 55° C., stirring for 2 h, and centrifuging, washing and drying to obtain carboxylated carbon nanotubes; S32, adding 2.5g of carboxylated carbon nanotubes to 150mL of toluene, dispersing them evenly by ultrasonic oscillation (power 300W, 20min), obtaining a suspension, adding 10mL of thionyl chloride to the suspension, and then adding 25mg of dimethylformamide, heating to 65°C, reacting for 4h, removing the excess thionyl chloride and toluene by rotary evaporator (150r / min, temperature 55°C), obtaining acyl chloride carbon nanotubes; S33, adding 2 g of acyl chloride carbon nanotubes into 100 mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300 W, 25 min) to obtain a suspension, adding 1.6 g of p-aminostyrene to the suspension, heating to 85° C. under nitrogen protection, stirring and reacting for 5 h, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34. Add 100g of methyl methacrylate and carbon nanotube modified intermediate into 500mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.6, then add 0.9g of benzoyl peroxide, disperse evenly by ultrasonic oscillation (power 250W, 20min), then transfer to a polymerization tube, heat to 75°C under nitrogen protection, react for 8h, and obtain modified polymethyl methacrylate.

[0024] Example 2 A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1. Mix the inorganic glass raw material (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and the quantum dot precursor (mass ratio NaBr:CsCO3:PbSO2=40:30:30) in a mass ratio of 10:1, and then heat to 1325°C for melting, smelt for 2h, quench and cool to 80°C, and then temper and crystallize at 625°C for 3h to obtain quantum dot glass; S2, grinding the quantum dot glass, passing it through a sieve with an aperture of 5-10 um, controlling the particle size of the quantum dot glass to be 5-10 um, and then granulating it to obtain quantum dot glass powder; S3. Evenly mix the modified polymethyl methacrylate, dot glass powder and nano-silicon dioxide (the mass ratio of the three is 10:2.2:1.3), then add them into an injection molding machine and extrude them at 210° C. to obtain a perovskite quantum dot enhanced diffusion plate.

[0025] The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding 3 g of carbon nanotubes to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heating to 55° C., stirring for 2 h, and centrifuging, washing and drying to obtain carboxylated carbon nanotubes; S32, adding 2.5g of carboxylated carbon nanotubes to 150mL of toluene, dispersing them evenly by ultrasonic oscillation (power 300W, 20min), obtaining a suspension, adding 10mL of thionyl chloride to the suspension, and then adding 25mg of dimethylformamide, heating to 65°C, reacting for 4h, removing the excess thionyl chloride and toluene by rotary evaporator (150r / min, temperature 55°C), obtaining acyl chloride carbon nanotubes; S33, adding 2 g of acyl chloride carbon nanotubes into 100 mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300 W, 25 min) to obtain a suspension, adding 1.6 g of p-aminostyrene to the suspension, heating to 85° C. under nitrogen protection, stirring and reacting for 5 h, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34. Add 100g of methyl methacrylate and carbon nanotube modified intermediate into 500mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate being 100:1.3, then add 0.9g of benzoyl peroxide, disperse evenly by ultrasonic oscillation (power 250W, 20min), then transfer to a polymerization tube, heat to 75°C under nitrogen protection, react for 8h, and obtain modified polymethyl methacrylate.

[0026] Example 3 A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1. Mix the inorganic glass raw material (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and the quantum dot precursor (mass ratio NaBr:CsCO3:PbSO2=40:30:30) in a mass ratio of 10:1, and then heat to 1325°C for melting, smelt for 2h, quench and cool to 80°C, and then temper and crystallize at 625°C for 3h to obtain quantum dot glass; S2, grinding the quantum dot glass, passing it through a sieve with an aperture of 5-10 um, controlling the particle size of the quantum dot glass to be 5-10 um, and then granulating it to obtain quantum dot glass powder; S3. Evenly mix the modified polymethyl methacrylate, dot glass powder and nano-silicon dioxide (the mass ratio of the three is 10:2.5:1.5), then add them into an injection molding machine and extrude them at 210° C. to obtain a perovskite quantum dot enhanced diffusion plate.

[0027] The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding 3 g of carbon nanotubes to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heating to 55° C., stirring for 2 h, and centrifuging, washing and drying to obtain carboxylated carbon nanotubes; S32, adding 2.5g of carboxylated carbon nanotubes to 150mL of toluene, dispersing them evenly by ultrasonic oscillation (power 300W, 20min), obtaining a suspension, adding 10mL of thionyl chloride to the suspension, and then adding 25mg of dimethylformamide, heating to 65°C, reacting for 4h, removing the excess thionyl chloride and toluene by rotary evaporator (150r / min, temperature 55°C), obtaining acyl chloride carbon nanotubes; S33, adding 2 g of acyl chloride carbon nanotubes into 100 mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300 W, 25 min) to obtain a suspension, adding 1.6 g of p-aminostyrene to the suspension, heating to 85° C. under nitrogen protection, stirring and reacting for 5 h, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34. Add 100g of methyl methacrylate and carbon nanotube modified intermediate into 500mL of toluene, with the mass ratio of methyl methacrylate to carbon nanotube modified intermediate being 100:1.5, then add 0.9g of benzoyl peroxide, disperse evenly by ultrasonic oscillation (power 250W, 20min), then transfer to a polymerization tube, heat to 75°C under nitrogen protection, react for 8h, and obtain modified polymethyl methacrylate.

[0028] Example 4 A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1. Mix the inorganic glass raw material (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and the quantum dot precursor (mass ratio NaBr:CsCO3:PbSO2=40:30:30) in a mass ratio of 10:1, and then heat to 1350°C for melting, smelt for 2h, quench and cool to 80°C, and then temper and crystallize at 625°C for 3h to obtain quantum dot glass; S2, grinding the quantum dot glass, passing it through a sieve with an aperture of 5-10 um, controlling the particle size of the quantum dot glass to be 5-10 um, and then granulating it to obtain quantum dot glass powder; S3. Evenly mix the modified polymethyl methacrylate, dot glass powder and nano-silicon dioxide (the mass ratio of the three is 10:3:2), then add them into an injection molding machine and extrude them at 210° C. to obtain a perovskite quantum dot enhanced diffusion plate.

[0029] The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding 3 g of carbon nanotubes to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heating to 55° C., stirring for 2 h, and centrifuging, washing and drying to obtain carboxylated carbon nanotubes; S32, adding 2.5g of carboxylated carbon nanotubes to 150mL of toluene, dispersing them evenly by ultrasonic oscillation (power 300W, 20min), obtaining a suspension, adding 10mL of thionyl chloride to the suspension, and then adding 25mg of dimethylformamide, heating to 65°C, reacting for 4h, removing the excess thionyl chloride and toluene by rotary evaporator (150r / min, temperature 55°C), obtaining acyl chloride carbon nanotubes; S33, adding 2 g of acyl chloride carbon nanotubes into 100 mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300 W, 25 min) to obtain a suspension, adding 1.6 g of p-aminostyrene to the suspension, heating to 85° C. under nitrogen protection, stirring and reacting for 5 h, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34. Add 100g of methyl methacrylate and carbon nanotube modified intermediate into 500mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.7, then add 0.9g of benzoyl peroxide, disperse evenly by ultrasonic oscillation (power 250W, 20min), then transfer to a polymerization tube, heat to 75°C under nitrogen protection, react for 8h, and obtain modified polymethyl methacrylate.

[0030] Example 5 A method for preparing a perovskite quantum dot enhanced diffuser plate comprises the following steps: S1. Mix the inorganic glass raw material (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and the quantum dot precursor (mass ratio NaBr:CsCO3:PbSO2=40:30:30) in a mass ratio of 10:1, heat to 1300°C for melting, smelt for 2h, cool to 80°C after quenching, and then temper and crystallize at 625°C for 3h to obtain quantum dot glass; S2, grinding the quantum dot glass, passing it through a sieve with an aperture of 5-10 um, controlling the particle size of the quantum dot glass to be 5-10 um, and then granulating it to obtain quantum dot glass powder; S3. Evenly mix the modified polymethyl methacrylate, dot glass powder and nano-silicon dioxide (the mass ratio of the three is 10:2:1), then add them into an injection molding machine and extrude them at 210° C. to obtain a perovskite quantum dot enhanced diffusion plate.

[0031] The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding 3 g of carbon nanotubes to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heating to 55° C., stirring for 2 h, and centrifuging, washing and drying to obtain carboxylated carbon nanotubes; S32, adding 2.5g of carboxylated carbon nanotubes to 150mL of toluene, dispersing them evenly by ultrasonic oscillation (power 300W, 20min), obtaining a suspension, adding 10mL of thionyl chloride to the suspension, and then adding 25mg of dimethylformamide, heating to 65°C, reacting for 4h, removing the excess thionyl chloride and toluene by rotary evaporator (150r / min, temperature 55°C), obtaining acyl chloride carbon nanotubes; S33, adding 2 g of acyl chloride carbon nanotubes into 100 mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300 W, 25 min) to obtain a suspension, adding 1.6 g of p-aminostyrene to the suspension, heating to 85° C. under nitrogen protection, stirring and reacting for 5 h, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34. Add 100g of methyl methacrylate and carbon nanotube modified intermediate into 500mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.2, then add 0.9g of benzoyl peroxide, disperse evenly by ultrasonic oscillation (power 250W, 20min), then transfer to a polymerization tube, heat to 75°C under nitrogen protection, react for 8h, and obtain modified polymethyl methacrylate.

[0032] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that, in the preparation process of the diffusion plate, the modified polymethyl methacrylate is replaced by ordinary polymethyl methacrylate, and the remaining operation steps are the same as those of Example 1.

[0033] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that, during the preparation of the diffusion plate, the modified polymethyl methacrylate is replaced with ordinary polymethyl methacrylate, and 1.6 g of carbon nanotubes are added, and the remaining operating steps are the same as those of Example 1.

[0034] Comparative Example 3 The difference between Comparative Example 3 and Example 5 is that, during the preparation of modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.1, and the remaining operation steps are the same as Example 5.

[0035] Comparative Example 4 The difference between Comparative Example 4 and Example 4 is that, during the preparation of modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.8, and the remaining operation steps are the same as Example 4.

[0036] Comparative Example 5 The difference between Comparative Example 5 and Example 4 is that, during the preparation of modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.9, and the remaining operation steps are the same as Example 4.

[0037] Performance Testing: 1. Luminous efficiency test: The luminous efficiency test is carried out by using an integrating sphere, a spectrometer and a standard light source. The standard light source is placed at a specific position in the integrating sphere, the diffuser sample is placed, and after the light source is turned on, the input light radiation power P in the integrating sphere is measured using a spectrometer. in And the output light radiation power P after being scattered by the diffuser out , according to the formula η=P out / P in ×100%, calculate the luminous efficiency, measure each sample 3 times and take the average value. The test results are shown in Table 1.

[0038] 2. Brightness test: The CA-410 luminance meter was adjusted to the appropriate measurement mode and parameters to ensure that its accuracy and sensitivity met the test requirements. The perovskite quantum dot enhanced diffuser plate sample to be tested was then placed on a stable test platform to ensure that the sample surface was flat and unobstructed. The perovskite quantum dot diffuser plate was placed on a blue light backplane with a brightness of 300 nits. A luminance meter was used to select multiple evenly distributed measurement points on the surface of the diffuser plate. Five points were measured for each sample, and the average brightness was taken. The test results are shown in Table 1.

[0039] 3. Light transmittance test: The transmittance test uses a spectrophotometer. First, calibrate with a standard sample of known transmittance, then put the cut diffuser sample into the sample pool, illuminate it vertically, set the visible light range to 400-760nm, and measure the luminous flux I of the sample at different wavelengths. λ , and record the incident light flux I0, calculate the transmittance T of each wavelength λ =I λ / I0×100%, each sample was measured 3 times at different positions and the average was taken. The test results are shown in Table 1.

[0040] 4. Stability performance test: The stability test uses a constant temperature and humidity chamber, an integrating sphere, a spectrometer and a standard light source. The initial luminous efficiency η0 of the sample is first measured according to the luminous efficiency test method. The sample is placed in a constant temperature and humidity chamber set at a temperature of 60°C and a relative humidity of 85% for aging for 1000 hours. After being taken out and placed at room temperature for 24 hours, the luminous efficiency after aging η1 is measured according to the luminous efficiency test method. The luminous efficiency retention rate R=η1 / η0×100% is calculated to test the stability performance of the diffuser. The test results are shown in Table 1.

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a perovskite quantum dot enhanced diffuser plate, characterized in that: The following steps are involved: S1, heating and melting the inorganic glass raw material and the quantum dot precursor, and then quenching, cooling, tempering and crystallizing to obtain quantum dot glass; S2, grinding and granulating the quantum dot glass to obtain quantum dot glass powder; S3, mixing modified polymethyl methacrylate, dot glass powder and diffusion particles, and then adding them into an injection molding machine for extrusion to obtain a perovskite quantum dot enhanced diffusion plate.

2. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In the step S1, the inorganic glass raw material includes one or more of SiO2, TiO2, Al2O3, and CaCO3.

3. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In the step S1, the quantum dot precursor includes one or more of NaBr, CsCO3, and PbSO2.

4. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In the step S1, the heating and melting temperature is 1300-1350°C.

5. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In the step S2, the particle size of the quantum dot glass after grinding and granulation is controlled to be 5-10 um.

6. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In step S3, the diffusion particles include one or more of nano-silicon dioxide, nano-titanium dioxide, and nano-barium sulfate.

7. The method for preparing a perovskite quantum dot enhanced diffuser according to claim 1, characterized in that: In the step S3, the mass ratio of modified polymethyl methacrylate, quantum dot glass powder and diffusion particles is 10:2-3:1-2.

8. The method for preparing a perovskite quantum dot enhanced diffuser plate according to claim 1, characterized in that: The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding carbon nanotubes to a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heating and stirring to react, and performing centrifugal separation, washing and drying to obtain carboxylated carbon nanotubes; S32, adding the carboxylated carbon nanotubes to toluene, dispersing them uniformly by ultrasonic oscillation to obtain a suspension, adding thionyl chloride to the suspension, and then adding a catalyst, reacting under heating conditions, removing excess thionyl chloride and toluene by rotary evaporation, and obtaining acyl chloride carbon nanotubes; S33, adding acyl chloride carbon nanotubes to toluene, dispersing them evenly by ultrasonic oscillation to obtain a suspension, adding p-aminostyrene to the suspension, heating and stirring the suspension under nitrogen protection, filtering, washing and drying to obtain a carbon nanotube modified intermediate; S34, adding methyl methacrylate and carbon nanotube modified intermediate into toluene, and then adding benzoyl peroxide initiator, dispersing evenly by ultrasonic oscillation, and then transferring into a polymerization tube, heating and reacting under nitrogen protection to obtain modified polymethyl methacrylate.

9. The method for preparing a perovskite quantum dot enhanced diffuser plate according to claim 8, characterized in that: In the step S34, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.2-1.

7.

10. A perovskite quantum dot enhanced diffuser plate, characterized in that: The method is prepared by any one of claims 1 to 9.

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