Perovskite quantum dot enhanced diffusion plate and preparation method thereof

Abstract

The application 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 inorganic glass raw materials and quantum dot precursors, quenching and cooling, tempering and crystallizing, obtaining 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, and then adding the mixture into an injection molding machine to perform extrusion, and finally obtaining the perovskite quantum dot enhanced diffusion plate. The methyl methacrylate is modified, the problem that the charge encounters great obstruction when being transmitted between the quantum dot and the methyl methacrylate is solved, and the luminous efficiency of the diffusion plate is improved.

Description

TECHNICAL FIELD

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

[0002] In the field of modern display technology and lighting, optical elements play a key role in improving display effect and lighting quality. Perovskite quantum dot enhanced diffusion plate, as a new type of optical element, has attracted much attention in recent years. It combines the excellent optical performance of perovskite quantum dots with the function of diffusion plate, can effectively improve the propagation characteristics of light, enhance the display effect and make the light distribution more uniform, and has great application potential in liquid crystal display (LCD), organic light-emitting diode display (OLED) and lighting lamps and other products.

[0003] Perovskite quantum dots have the advantages of narrow emission spectrum, high quantum yield and adjustable luminescent color. When they are applied to diffusion plates, the optical performance of the diffusion plates can be significantly improved, 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 processability and chemical stability, and is one of the commonly used materials for preparing diffusion plates. However, there is an interface charge transfer problem between quantum dots and methyl methacrylate. Due to the difference in physical and chemical properties between the two, the electron cloud distribution and energy level structure at the interface do not match, resulting in a large obstacle to the transfer of charges between quantum dots and methyl methacrylate. When the quantum dots are excited to produce electron-hole pairs, the electrons and holes cannot be efficiently transferred to the methyl methacrylate, and part of the charges will recombine on the surface of the quantum dots, releasing energy in the form of non-radiation, which greatly reduces the light-emitting efficiency of the diffusion plate. SUMMARY

[0005] The purpose of the present application is to provide a perovskite quantum dot enhanced diffusion plate and a preparation method thereof, to solve the technical problem of the above-mentioned charge transfer between quantum dots and methyl methacrylate. The present application modifies methyl methacrylate to solve the above-mentioned technical problems, thereby improving the light-emitting efficiency of the diffusion plate.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A preparation method of a perovskite quantum dot enhanced diffusion plate, comprising the following steps:

[0008] S1, heating and melting inorganic glass raw materials and quantum dot precursors, quenching and tempering to obtain quantum dot glass;

[0009] S2, grinding and granulating the quantum dot glass to obtain quantum dot glass powder;

[0010] S3, mixing the modified polymethyl methacrylate, the quantum dot glass powder and the diffusion particles, and then adding them into an injection molding machine for extrusion to obtain a perovskite quantum dot reinforced diffusion plate.

[0011] In the technical scheme of the present application, the inorganic glass raw material forms a matrix after being heated and melted, providing a uniform dispersion environment for the quantum dot precursor, which helps the uniform growth of the quantum dots. The quantum dot precursor is subjected to processes such as quenching and tempering to form high-quality perovskite quantum dots, which have excellent light-emitting efficiency and stability. The inorganic glass matrix can also protect the quantum dots from external erosion and maintain their long-term light-emitting performance. The quantum dot glass powder obtained by grinding and granulating has a micron-level particle size, which provides a large specific surface area. When mixed with modified polymethyl methacrylate, it can enhance the interaction between the two. The good flowability and formability of the granulated powder facilitate operation in the injection molding machine. The diffusion particles can optimize the light scattering effect and improve the uniformity of the emitted light, meeting the optical requirements of high-end fields.

[0012] Preferably, in step S1, the inorganic glass raw material includes one or more of SiO2, TiO2, Al2O3 and CaCO3.

[0013] Preferably, in step S1, the quantum dot precursor includes one or more of NaBr, CsCO3 and PbSO2.

[0014] Preferably, in step S1, the heating and melting temperature is 1300-1350℃.

[0015] Preferably, in step S2, the particle size of the quantum dot glass after grinding and granulation is controlled to be 5-10um.

[0016] Preferably, in step S3, the diffusion particles include one or more of nano-silicon dioxide, nano-titanium dioxide and nano-barium sulfate.

[0017] Preferably, in step S3, the mass ratio of the modified polymethyl methacrylate, the quantum dot glass powder and the diffusion particles is 10:2-3:1-2.

[0018] Preferably, the preparation method of the modified polymethyl methacrylate comprises the following steps:

[0019] S31, adding carbon nanotubes into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heating and stirring to react, and then centrifuging, washing and drying to obtain carboxylated carbon nanotubes;

[0020] S32, adding the carboxylated carbon nanotubes into toluene, uniformly dispersing by ultrasonic oscillation to obtain a suspension, adding dichlorosulfoxide into the suspension, then adding a catalyst, reacting under heating, removing the excess dichlorosulfoxide and toluene by rotary evaporation to obtain acyl chloride carbon nanotubes;

[0021] S33, adding the acyl chloride carbon nanotubes into toluene, uniformly dispersing by ultrasonic oscillation to obtain a suspension, adding p-aminostyrene into the suspension, reacting under heating and stirring under nitrogen protection, through suction filtration, washing and drying to obtain a carbon nanotube modified intermediate;

[0022] S34, adding methyl methacrylate and the carbon nanotube modified intermediate into toluene, then adding a benzoyl peroxide initiator, uniformly dispersing by ultrasonic oscillation, then transferring into a polymerization tube, reacting under heating under nitrogen protection to obtain modified polymethyl methacrylate.

[0023] In the technical scheme of the present application, due to the large difference in electronic structure between the quantum dot glass powder and the methyl methacrylate, the photogenerated carriers (electrons and holes) generated by the quantum dots are difficult to be smoothly transmitted to the methyl methacrylate under light excitation, and part of the carriers will recombine at the interface, resulting in a decrease in the light-emitting efficiency of the quantum dots. However, the addition of carbon nanotubes in the diffusion plate can effectively improve this situation. The carbon nanotubes have excellent electrical properties and can act as a bridge for carrier transmission, accelerating the transmission of the photogenerated carriers generated by the quantum dots to the methyl methacrylate, reducing the recombination of the carriers at the interface, and thus improving the light-emitting efficiency of the quantum dots, so that the diffusion plate can present brighter and more vivid colors in display and lighting applications.

[0024] However, the present application team found through experimental research that directly mixing the carbon nanotubes with the methyl methacrylate and the quantum dot glass powder will seriously affect the improvement of the carbon nanotubes on the light-emitting efficiency of the diffusion plate due to the easy agglomeration and displacement of the carbon nanotubes. Therefore, the present application further modifies and compounding the methyl methacrylate and the carbon nanotubes, acidizes the carbon nanotubes to produce carboxyl groups on the surface of the carbon nanotubes. Then, the carboxyl groups are converted into acyl chloride groups by using dichlorosulfoxide, and then reacted with organic amines containing double bonds to introduce double bond groups. These double bonds can subsequently undergo a free radical polymerization reaction with methyl methacrylate, so that the carbon nanotubes are tightly combined with the methyl methacrylate. In this process, the surface properties of the carbon nanotubes change, the interaction between the carbon nanotubes and the methyl methacrylate is enhanced, agglomeration is effectively prevented, uniform dispersion is achieved, and displacement of the carbon nanotubes in the matrix is prevented, thereby greatly improving the light-emitting efficiency of the diffusion plate.

[0025] Preferably, in the step S34, the mass ratio of the methyl methacrylate to the carbon nanotube modified intermediate is 100:1.2-1.7.

[0026] Preferably, in the step S34, the mass ratio of the methyl methacrylate to the carbon nanotube modified intermediate is 100:1.2-1.7.

[0027] In the technical solution of the present application, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is controlled to be greater than 100:1.2

[0028] 1.2, because carbon nanotubes act as a bridge for carrier transport, accelerating the transport of photo-generated carriers generated by quantum dots to methyl methacrylate. If the amount of carbon nanotubes is too small, an effective transport network cannot be formed, resulting in limited improvement of the light-emitting efficiency of the diffusion plate by carbon nanotubes. However, the present team has found that when the amount of carbon nanotubes is further increased, i.e., when the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is less than 100:1.7, the brightness of the diffusion plate decreases sharply. This may be because there is a difference in the refractive index between carbon nanotubes and the surrounding medium. When light encounters a large number of carbon nanotubes during propagation, the propagation direction changes, resulting in increased scattering and haze, and reduced brightness of the diffusion plate. When the amount of carbon nanotubes is within a certain range, this effect has little effect on the brightness of the diffusion plate, but when the amount of carbon nanotubes increases to a certain critical value, this effect dominates and has a large effect on the brightness of the diffusion plate. Therefore, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is controlled to be greater than 100:1.7 in the present application.

[0029] A perovskite quantum dot enhanced diffusion plate is prepared by the method described above.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. The substrate formed by melting inorganic glass provides a uniform environment for the growth of quantum dots and protects the quantum dots to maintain long-term luminescent properties. The treated quantum dot glass powder enhances the interaction with modified polymethyl methacrylate, and the diffusion particles improve the uniformity of light emission, meeting the high-end optical requirements.

[0032] 2. Carbon nanotubes solve the transmission barrier of electric charges between quantum dots and methyl methacrylate. Carbon nanotubes act as a bridge to accelerate the transport of photo-generated carriers, reduce interface recombination, significantly improve the luminescent efficiency of quantum dots, and present better color. In addition, the modification and compounding of polymethyl methacrylate and carbon nanotubes prevent the agglomeration and displacement of carbon nanotubes, achieving uniform dispersion.

[0033] 3. The mass ratio of methyl methacrylate to carbon nanotube modified intermediate is reasonably controlled to effectively avoid the problem of reduced brightness of the diffusion plate caused by improper amount of carbon nanotubes. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0035] Embodiment 1

[0036] A preparation method of a perovskite quantum dot enhanced diffusion plate, comprising the following steps:

[0037] S1, inorganic glass raw materials (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and quantum dot precursors (mass ratio NaBr:CsCO3:PbSO2=40:30:30) are mixed uniformly according to a mass ratio of 10:1, then heated to 1325℃ for melting, and smelting for 2h, and then quenched to 80℃, and then annealed and crystallized at 625℃ for 3h to obtain quantum dot glass;

[0038] S2, the quantum dot glass is ground, passes through a screen with a pore size of 5-10um to control the particle size of the quantum dot glass to be 5-10um, and then is granulated to obtain quantum dot glass powder;

[0039] S3, the modified polymethyl methacrylate, the quantum dot glass powder and the nanosilica (mass ratio of the three is 10:2.8:1.9) are mixed uniformly, and then are added into an injection molding machine for extrusion at 210℃ to obtain a perovskite quantum dot enhanced diffusion plate.

[0040] The preparation method of the modified polymethyl methacrylate comprises the following steps:

[0041] S31, 3g of carbon nanotubes are added into a mixed solution of 60mL of concentrated sulfuric acid and 20mL of concentrated nitric acid, heated to 55℃, and stirred for 2h of reaction, and then centrifuged, washed and dried to obtain carboxylated carbon nanotubes;

[0042] S32, 2.5g of carboxylated carbon nanotubes are added into 150mL of toluene, ultrasonically oscillated and dispersed uniformly (power 300W, 20min) to obtain a suspension, 10mL of dichlorosulfide is added into the suspension, then 25mg of dimethylformamide is added, heated to 65℃, and reacted for 4h, and then excess dichlorosulfide and toluene are removed by a rotary evaporator (150r / min, temperature 55℃) to obtain acyl chloride carbon nanotubes;

[0043] S33, 2 g of acyl chloride carbon nanotubes were added to 100 mL of toluene, ultrasonic oscillation was used to disperse uniformly (power 300 W, 25 min), a suspension was obtained, 1.6 g of p-aminostyrene was added to the suspension, and the suspension was heated to 85°C under nitrogen protection, and stirred for 5 h. After filtration, washing and drying, a carbon nanotube modified intermediate was obtained;

[0044] S34, 100 g of methyl methacrylate and carbon nanotube modified intermediate were added to 500 mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate was 100:1.6, then 0.9 g of benzoyl peroxide was added, ultrasonic oscillation was used to disperse uniformly (power 250 W, 20 min), and then transferred to a polymerization tube. Under nitrogen protection, it was heated to 75°C and reacted for 8 h to obtain modified polymethyl methacrylate.

[0045] Example 2

[0046] A preparation method of a perovskite quantum dot enhanced diffusion plate, comprising the following steps:

[0047] S1, inorganic glass raw materials (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and quantum dot precursors (mass ratio NaBr:CsCO3:PbSO2=40:30:30) were mixed uniformly according to a mass ratio of 10:1, then heated to 1325°C for melting, and then subjected to melting for 2 h. After quenching to 80°C, it was tempered and crystallized at 625°C for 3 h to obtain a quantum dot glass;

[0048] S2, the quantum dot glass was ground and passed through a sieve with a pore size of 5-10 um to control the particle size of the quantum dot glass to 5-10 um, and then granulated to obtain a quantum dot glass powder;

[0049] S3, the modified polymethyl methacrylate, the quantum dot glass powder and the nanosilica (mass ratio of the three is 10:2.2:1.3) were mixed uniformly, then added to an injection molding machine and extruded at 210°C to obtain a perovskite quantum dot enhanced diffusion plate.

[0050] The preparation method of the modified polymethyl methacrylate comprises the following steps:

[0051] S31, 3 g of carbon nanotubes were added to a mixed solution of 60 mL of concentrated sulfuric acid and 20 mL of concentrated nitric acid, heated to 55°C, and stirred for 2 h. After centrifugal separation, washing and drying, carboxylated carbon nanotubes were obtained;

[0052] S32, 2.5 g of carboxylated carbon nanotubes were added to 150 mL of toluene, ultrasonic oscillation was used to disperse them uniformly (power 300 W, 20 min), a suspension was obtained, 10 mL of dichlorosulfide was added to the suspension, then 25 mg of dimethylformamide was added, heated to 65℃, and reacted for 4 h, and then the excess dichlorosulfide and toluene were removed by a rotary evaporator (150 r / min, temperature 55℃), acyl chloride carbon nanotubes were obtained;

[0053] S33, 2 g of acyl chloride carbon nanotubes were added to 100 mL of toluene, ultrasonic oscillation was used to disperse them uniformly (power 300 W, 25 min), a suspension was obtained, 1.6 g of p-aminostyrene was added to the suspension, heated to 85℃ under nitrogen protection, stirred for 5 h, and then filtered, washed and dried to obtain a carbon nanotube modified intermediate;

[0054] S34, 100 g of methyl methacrylate and carbon nanotube modified intermediate were added to 500 mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate was 100:1.3, then 0.9 g of benzoyl peroxide was added, ultrasonic oscillation was used to disperse them uniformly (power 250 W, 20 min), then transferred to a polymerization tube, heated to 75℃ under nitrogen protection, and reacted for 8 h to obtain modified polymethyl methacrylate.

[0055] Example 3

[0056] A preparation method of a perovskite quantum dot enhanced diffusion plate, comprising the following steps:

[0057] S1, inorganic glass raw materials (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and quantum dot precursors (mass ratio NaBr:CsCO3:PbSO2=40:30:30) were mixed uniformly according to a mass ratio of 10:1, then heated to 1325℃ for melting, and then subjected to melting for 2 h, and then quenched to 80℃, and then subjected to tempering and crystallization treatment at 625℃ for 3 h to obtain quantum dot glass;

[0058] S2, the quantum dot glass was ground, and the particle size of the quantum dot glass was controlled to be 5-10 um by passing through a sieve with a pore size of 5-10 um, and then the quantum dot glass powder was obtained by granulation;

[0059] S3, the modified polymethyl methacrylate, the quantum dot glass powder and nano silicon dioxide (the mass ratio of the three was 10:2.5:1.5) were mixed uniformly, then added to an injection molding machine and extruded at 210℃ to obtain a perovskite quantum dot enhanced diffusion plate.

[0060] The preparation method of the modified polymethyl methacrylate comprises the following steps:

[0061] S31, 3 g carbon nanotubes are added into a mixed solution of 60 mL concentrated sulfuric acid and 20 mL concentrated nitric acid, heated to 55℃, stirred for 2 h, and then centrifuged, washed and dried to obtain carboxylated carbon nanotubes;

[0062] S32, 2.5 g of carboxylated carbon nanotubes are added into 150 mL of toluene, ultrasonic oscillation is uniformly dispersed (power 300 W, 20 min) to obtain a suspension, 10 mL of dichlorosulfide is added to the suspension, then 25 mg of dimethylformamide is added, heated to 65℃, reacted for 4 h, and then excess dichlorosulfide and toluene are removed by a rotary evaporator (150 r / min, temperature 55℃) to obtain acyl chloride carbon nanotubes;

[0063] S33, 2 g of acyl chloride carbon nanotubes are added into 100 mL of toluene, ultrasonic oscillation is uniformly dispersed (power 300 W, 25 min) to obtain a suspension, 1.6 g of p-aminostyrene is added to the suspension, heated to 85℃ under nitrogen protection, stirred for 5 h, and then filtered, washed and dried to obtain a carbon nanotube modified intermediate;

[0064] S34, 100 g of methyl methacrylate and carbon nanotube modified intermediate are added into 500 mL of toluene, the mass ratio of methyl methacrylate to carbon nanotube modified intermediate is 100:1.5, then 0.9 g of benzoyl peroxide is added, ultrasonic oscillation is uniformly dispersed (power 250 W, 20 min), and then transferred to a polymerization tube, heated to 75℃ under nitrogen protection, and reacted for 8 h to obtain modified polymethyl methacrylate.

[0065] Example 4

[0066] A preparation method of a perovskite quantum dot enhanced diffusion plate, comprising the following steps:

[0067] S1, inorganic glass raw materials (mass ratio SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and quantum dot precursors (mass ratio NaBr:CsCO3:PbSO2=40:30:30) are mixed uniformly according to a mass ratio of 10:1, then heated to 1350℃ for melting, and then subjected to melting for 2 h, and then quenched to 80℃, and then subjected to tempering and crystallization treatment at 625℃ for 3 h to obtain quantum dot glass;

[0068] S2, the quantum dot glass is ground, passes through a sieve with a pore size of 5-10 um to control the particle size of the quantum dot glass to be 5-10 um, and then is granulated to obtain quantum dot glass powder;

[0069] S3, the modified polymethyl methacrylate, the point glass powder and the nanometer silicon dioxide (the mass ratio of the three is 10:3:2) are uniformly mixed, then are added into an injection molding machine and are extruded at 210℃ to obtain a perovskite quantum dot enhanced diffusion plate.

[0070] The preparation method of the modified polymethyl methacrylate comprises the following steps:

[0071] S31, 3g carbon nanotubes are added into a mixed solution of 60mL concentrated sulfuric acid and 20mL concentrated nitric acid, heated to 55℃, stirred for 2h, and then centrifuged, washed and dried to obtain carboxylated carbon nanotubes;

[0072] S32, 2.5g carboxylated carbon nanotubes are added into 150mL toluene, ultrasonically oscillated and dispersed uniformly (power 300W, 20min) to obtain a suspension, 10mL dichlorosulfide is added into the suspension, then 25mg dimethylformamide is added, heated to 65℃, reacted for 4h, and then the excess dichlorosulfide and toluene are removed by a rotary evaporator (150r / min, temperature 55℃) to obtain acyl chloride carbon nanotubes;

[0073] S33, 2g acyl chloride carbon nanotubes are added into 100mL toluene, ultrasonically oscillated and dispersed uniformly (power 300W, 25min) to obtain a suspension, 1.6g p-aminostyrene is added into the suspension, heated to 85℃ under nitrogen protection, stirred for 5h, and then filtered, washed and dried to obtain a carbon nanotube modified intermediate;

[0074] S34, 100g methyl methacrylate and the carbon nanotube modified intermediate are added into 500mL toluene, the mass ratio of the methyl methacrylate to the carbon nanotube modified intermediate is 100:1.7, then 0.9g benzoyl peroxide is added, ultrasonically oscillated and dispersed uniformly (power 250W, 20min), then transferred into a polymerization tube, heated to 75℃ under nitrogen protection, and reacted for 8h to obtain the modified polymethyl methacrylate.

[0075] Example 5

[0076] A preparation method of a perovskite quantum dot enhanced diffusion plate comprises the following steps:

[0077] S1, inorganic glass raw materials (mass ratio of SiO2:TiO2:Al2O3:CaCO3=50:10:15:25) and quantum dot precursors (mass ratio of NaBr:CsCO3:PbSO2=40:30:30) are uniformly mixed according to a mass ratio of 10:1, then are heated to 1300℃ to melt, are smelted for 2h, are quenched to 80℃, and then are tempered and crystallized at 625℃ for 3h to obtain quantum dot glass.

[0078] S2, grinding the quantum dot glass, controlling the particle size of the quantum dot glass to be 5-10 um by passing through a sieve with a pore size of 5-10 um, and then granulating to obtain quantum dot glass powder;

[0079] S3, uniformly mixing the modified polymethyl methacrylate, the quantum dot glass powder and the nano-silicon dioxide (mass ratio of 10:2:1), and then adding them into an injection molding machine to be extruded at 210℃ to obtain a perovskite quantum dot enhanced diffusion plate.

[0080] The preparation method of the modified polymethyl methacrylate comprises the following steps:

[0081] S31, adding 3g of carbon nanotubes into a mixed solution of 60mL of concentrated sulfuric acid and 20mL of concentrated nitric acid, heating to 55℃, stirring for 2h, and then performing centrifugal separation, washing and drying to obtain carboxylated carbon nanotubes;

[0082] S32, adding 2.5g of carboxylated carbon nanotubes into 150mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300W, 20min) to obtain a suspension, adding 10mL of dichlorosulfoxide into the suspension, then adding 25mg of dimethylformamide, heating to 65℃, reacting for 4h, and then removing the excess dichlorosulfoxide and toluene by a rotary evaporator (150r / min, temperature 55℃) to obtain acyl chloride carbon nanotubes;

[0083] S33, adding 2g of acyl chloride carbon nanotubes into 100mL of toluene, uniformly dispersing by ultrasonic oscillation (power 300W, 25min) to obtain a suspension, adding 1.6g of p-aminostyrene into the suspension, heating to 85℃ under nitrogen protection, stirring for 5h, and then performing suction filtration, washing and drying to obtain a carbon nanotube modified intermediate;

[0084] S34, adding 100g of methyl methacrylate and the carbon nanotube modified intermediate into 500mL of toluene, the mass ratio of the methyl methacrylate to the carbon nanotube modified intermediate being 100:1.2, then adding 0.9g of benzoyl peroxide, uniformly dispersing by ultrasonic oscillation (power 250W, 20min), and then transferring into a polymerization tube, heating to 75℃ under nitrogen protection, and reacting for 8h to obtain modified polymethyl methacrylate.

[0085] Comparative Example 1

[0086] The difference between Comparative Example 1 and Example 1 is that the modified polymethyl methacrylate is replaced by ordinary polymethyl methacrylate in the preparation process of the diffusion plate, and the remaining operation steps are the same as those of Example 1.

[0087] Comparative Example 2

[0088] The difference between Comparative Example 2 and Example 1 is that, in the preparation process of the diffusion plate, the modified polymethyl methacrylate is replaced by ordinary polymethyl methacrylate, and 1.6 g of carbon nanotubes is added, and the remaining operation steps are the same as those of Example 1.

[0089] Comparative Example 3

[0090] The difference between Comparative Example 3 and Example 5 is that, in the preparation process of the modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modification intermediate is 100:1.1, and the remaining operation steps are the same as those of Example 5.

[0091] Comparative Example 4

[0092] The difference between Comparative Example 4 and Example 4 is that, in the preparation process of the modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modification intermediate is 100:1.8, and the remaining operation steps are the same as those of Example 4.

[0093] Comparative Example 5

[0094] The difference between Comparative Example 5 and Example 4 is that, in the preparation process of the modified polymethyl methacrylate, the mass ratio of methyl methacrylate to carbon nanotube modification intermediate is 100:1.9, and the remaining operation steps are the same as those of Example 4.

[0095] Performance test:

[0096] 1. Luminescent efficiency test:

[0097] The luminescent efficiency test is carried out by integrating sphere, spectrometer and standard light source. The standard light source is placed at a specific position of the integrating sphere, the diffusion plate sample is placed, the light source is turned on, and the input light radiation power P in and the output light radiation power P out emitted after scattering by the diffusion plate are measured by the spectrometer, the luminescent efficiency is calculated according to the formula η=P out / P in ×100%, each sample is measured for 3 times and the average value is taken, and the test results are shown in Table 1.

[0098] 2. Brightness test:

[0099] The CA-410 brightness meter is adjusted to the appropriate measurement mode and parameters to ensure its accuracy and sensitivity meet the test requirements, then the perovskite quantum dot enhanced diffusion plate sample to be tested is placed on a stable test platform to ensure the sample surface is flat and unobstructed, the perovskite quantum dot diffusion plate is placed on a blue light backboard with a brightness of 300 nits, and the brightness meter is used to select multiple evenly distributed measurement points on the surface of the diffusion plate, 5 points are measured for each sample, and the average brightness value is taken, and the test results are shown in Table 1.

[0100] 3. Light transmittance test:

[0101] The light transmittance test uses a spectrophotometer, which is first calibrated with a known light transmittance standard sample, and then the cut diffusion plate sample is placed in the sample cell, the light is vertically irradiated, the visible light range 400-760nm is set as the measurement wavelength, and the light flux I through the sample at different wavelengths is measured λ , and the incident light flux I0is recorded, and the light transmittance T at each wavelength is calculated λ =I λ / I0x 100%, 3 times are measured at different positions of each sample and averaged, and the test results are shown in Table 1.

[0102] 4. Stability test:

[0103] The stability test uses a constant temperature and humidity chamber, an integrating sphere, a spectrometer and a standard light source, first measures the initial luminous efficiency η0of the sample according to the luminous efficiency test method, places the sample in a constant temperature and humidity chamber set at a temperature of 60℃ and a relative humidity of 85% for aging for 1000 hours, takes it out and places it at room temperature for 24 hours, and then measures the luminous efficiency η1after aging according to the luminous efficiency test method, calculates the luminous efficiency retention rate R = η1 / η0x 100%, and thus tests the stability of the diffusion plate, and the test results are shown in Table 1.

[0104]

[0105] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a perovskite quantum dot enhanced diffuser plate, characterized in that, The method comprises the following steps: S1, heating and melting inorganic glass raw materials and quantum dot precursors, quenching and tempering, to obtain quantum dot glass; S2, grinding and granulating the quantum dot glass to obtain quantum dot glass powder; S3, mixing modified polymethyl methacrylate, quantum dot glass powder and diffusion particles, and then adding them into an injection molding machine for extrusion to obtain a perovskite quantum dot reinforced diffusion plate; The preparation method of the modified polymethyl methacrylate comprises the following steps: S31, adding carbon nanotubes into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heating and stirring to react, and then performing centrifugal separation, washing and drying to obtain carboxylated carbon nanotubes; S32, adding the carboxylated carbon nanotubes into toluene, ultrasonic oscillation and uniform dispersion to obtain a suspension, adding dichlorosulfoxide into the suspension, then adding a catalyst, and reacting under heating, and then removing the excess dichlorosulfoxide and toluene by rotary evaporation to obtain acyl chloride carbon nanotubes; S33, adding the acyl chloride carbon nanotubes into toluene, ultrasonic oscillation and uniform dispersion to obtain a suspension, adding p-aminostyrene into the suspension, and then heating and stirring to react under nitrogen protection, and then performing suction filtration, washing and drying to obtain a carbon nanotube modified intermediate; S34, adding methyl methacrylate and the carbon nanotube modified intermediate into toluene according to a mass ratio of 100:1.2-1.7, then adding a benzoyl peroxide initiator, ultrasonic oscillation and uniform dispersion, and then transferring into a polymerization tube, and then heating to react under nitrogen protection to obtain modified polymethyl methacrylate.

2. The preparation method of the perovskite quantum dot enhanced diffusion plate according to claim 1, characterized in that, In the step S1, the inorganic glass raw materials comprise one or more of SiO2, TiO2, Al2O3 and CaCO3.

3. The preparation method of the perovskite quantum dot enhanced diffusion plate according to claim 1, characterized in that, In the step S1, the quantum dot precursors comprise one or more of NaBr, CsCO3 and PbSO2.

4. The preparation method of the perovskite quantum dot enhanced diffusion plate according to claim 1, characterized in that, In the step S1, the heating and melting temperature is 1300-1350℃.

5. The preparation method of the perovskite quantum dot enhanced diffusion plate 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 5-10um.

6. The preparation method of the perovskite quantum dot enhanced diffusion plate according to claim 1, characterized in that, In the step S3, the diffusion particles comprise one or more of nano-silicon dioxide, nano-titanium dioxide and nano-barium sulfate.

7. The method of claim 1, wherein the perovskite quantum dot-enhanced diffusion plate is prepared by the steps of: preparing a perovskite quantum dot solution by dissolving a perovskite quantum dot precursor in a solvent; and coating a diffusion plate with the perovskite quantum dot solution. In the step S3, the mass ratio of the modified polymethyl methacrylate, the quantum dot glass powder and the diffusion particles is 10:2-3:1-2.

8. A perovskite quantum dot enhanced diffuser plate, characterized in that, Prepared by the method of any one of claims 1-7.

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