A perovskite quantum dot-based organic silicon light-emitting elastomer, a preparation method therefor, and an application thereof

Abstract

The application discloses a kind of organic silicon luminescent elastomers based on perovskite quantum dots and its preparation method and application, belong to photoluminescence elastomer preparation technical field.The organic silicon luminescent elastomer based on perovskite quantum dots includes the following components according to weight fraction:100 parts of base glue, 1-20 parts of modified ABX3 perovskite quantum dots, 10-60 parts of filler, 1-15 parts of crosslinking agent and 0.1-6 parts of catalyst;A=Cs + , B=Pb 2+ , X=Cl ‑ , Br ‑ Or I ‑ In modified ABX3 perovskite quantum dots.The application makes specific limitation to each component and the ratio of each component, to obtain the organic silicon luminescent elastomer based on perovskite quantum dots with good mechanical properties and fluorescent properties;By adding modified ABX3 perovskite quantum dots, it can participate in the crosslinking system, effectively anchored in crosslinking network, and has good dispersity and stability, reduces perovskite quantum dots to appear agglomeration and inter-system stream, to realize good luminous intensity and luminous uniformity, persistence.

Description

Technical Field

[0001] This application relates to an organosilicon luminescent elastomer based on perovskite quantum dots, its preparation method and application, belonging to the field of photoluminescent elastomer preparation technology. Background Technology

[0002] In the field of X-ray imaging, traditional inorganic alkali metal halide scintillators (such as commercially available CsI:Tl) suffer from high toxicity and high detection limits, and typically require high-temperature fabrication, making them difficult to use in flexible devices. Novel organic long-afterglow scintillators can be solution-processed, but they have low luminous efficiency, and their long luminous lifetime can lead to slow response speeds in X-ray imaging.

[0003] In recent years, perovskite quantum dots have been widely used in solar cells, light-emitting diodes, photodetectors, and lasers due to their high absorption coefficient, high quantum yield, and low fabrication cost. More importantly, the presence of heavy atoms and large electron-hole spread lengths in perovskite quantum dots enables their application in X-ray imaging.

[0004] Existing X-ray imaging materials utilize perovskite quantum dots by physically mixing them with polymers such as polystyrene, followed by curing to obtain a luminescent film. However, the luminescent film prepared by this method exhibits perovskite quantum dot aggregation within the polymer and intersystem crosstalk. On the one hand, the aggregation of perovskite quantum dots leads to uneven luminescence in the luminescent film; on the other hand, the fluorescence performance of perovskite quantum dots decreases due to aggregation quenching, resulting in reduced fluorescence intensity, shorter fluorescence duration, and decreased fluorescence uniformity. Summary of the Invention

[0005] To address the aforementioned issues, a perovskite quantum dot-based organosilicon luminescent elastomer, its preparation method, and its applications are provided. By specifically defining the components and their proportions, a perovskite quantum dot-based organosilicon luminescent elastomer with excellent mechanical and fluorescent properties is obtained. By adding modified ABX3 perovskite quantum dots, they can participate in the crosslinking system, effectively anchoring themselves in the crosslinking network and exhibiting good dispersibility and stability. This reduces the aggregation and intersystem crosstalk of perovskite quantum dots, thereby achieving good luminescence intensity, uniformity, and continuity.

[0006] According to one aspect of this application, an organosilicon luminescent elastomer based on perovskite quantum dots is provided, comprising, by weight, the following components: 100 parts of base adhesive, 1-20 parts of modified ABX3 perovskite quantum dots, 10-60 parts of filler, 1-15 parts of crosslinking agent, and 0.1-6 parts of catalyst; wherein in the modified ABX3 perovskite quantum dots, A = Cs. +B = Pb 2+ X = Cl - ,Br - Or I - .

[0007] The modified ABX3 perovskite quantum dots exhibit high photoluminescence quantum efficiency, narrow emission peak, high color purity, and their emission spectrum can be adjusted by controlling the anions. Furthermore, they possess better thermal stability and moisture resistance, making them compatible with organosilicon luminescent elastomer systems.

[0008] Specifically, the application specifies the weight ratios of the base adhesive, modified ABX3 perovskite quantum dots, fillers, crosslinking agents, and catalysts to obtain organosilicon luminescent elastomers with excellent mechanical and fluorescent properties. Specifically, increasing the weight percentage of fillers increases the strength of the perovskite quantum dot-based organosilicon luminescent elastomer; however, excessive filler content hinders uniform mixing with the base adhesive. The crosslinking agent provides crosslinking points during the polymer reaction, enabling the linear polymer to form a three-dimensional crosslinked network structure, effectively anchoring the modified ABX3 perovskite quantum dots within the crosslinked network. However, excessive crosslinking points negatively impact mechanical properties. Adding a specific amount of catalyst initiates the crosslinking reaction, increasing the curing speed and shortening the curing time.

[0009] Specifically, this application limits the amount of modified ABX3 perovskite quantum dots to be added. If too little is added, the fluorescence performance will deteriorate. However, if too much is added, a second phase will be formed in the polymer matrix, which will seriously affect the initial mechanical properties and greatly reduce the tensile strength.

[0010] Preferably, the composition comprises the following components by weight: 100 parts base adhesive, 3-15 parts modified ABX3 perovskite quantum dots, 20-40 parts filler, 2-8 parts crosslinking agent, and 0.1-3 parts catalyst.

[0011] Optionally, the modified ABX3 perovskite quantum dots are obtained by modifying ABX3 perovskite quantum dots with organosilicon polymers.

[0012] Specifically, organosilicon polymers have repeating Si-O bonds as the main chain, with organic groups attached to silicon atoms. Due to the flexibility of the Si-O main chain, organosilicon polymers have good flexibility, as well as unique physical and chemical properties such as resistance to high and low temperatures, aging resistance, physiological inertness, and ozone resistance.

[0013] Specifically, the ABX3 perovskite quantum dots modified with organosilicon polymers, namely modified ABX3 perovskite quantum dots, have better fluorescence intensity and better compatibility, avoiding the decline in mechanical properties caused by phase separation and other problems.

[0014] Optionally, the organosilicon polymer includes hydroxyl-terminated mercaptopolysiloxane, hydroxyl-terminated trifluoropropylpolysiloxane, hydroxyl-terminated aminopolysiloxane, or hydroxyl-terminated carboxylpolysiloxane.

[0015] The molecular weight of the organosilicon polymer is 1000 to 20000.

[0016] If the molecular weight of the organosilicon polymer is less than 1000, there are too few functional groups that coordinate the organosilicon polymer with ABX3 perovskite quantum dots, and the modification effect is not obvious; if the molecular weight is greater than 20000, the solubility of the organosilicon polymer in the solvent becomes poor, and it is difficult to effectively passivate the perovskite quantum dots.

[0017] Specifically, organosilicon polymers can introduce groups such as thiol, carboxyl, and amino groups, which can effectively passivate the surface defects of ABX3 perovskite quantum dots and have higher adsorption energy, thus effectively improving the stability of ABX3 perovskite quantum dots. In addition, perovskite quantum dots modified by organosilicon polymers have better compatibility with silicone rubber and better dispersibility in polymer matrices.

[0018] Optionally, the base adhesive is a hydroxyl-terminated polysiloxane or a dihydroxy polysiloxane; the filler is one or more of fumed silica, deposited silica, calcium carbonate, or talc; the crosslinking agent is a silane coupling agent with trifunctionality or higher, consisting of siloxy or silethoxy groups; and the catalyst is at least one of dibutyltin dilaurate or stannous octoate.

[0019] Specifically, the base adhesive includes one of α,ω-dihydroxy polydimethylsiloxane, α,ω-dihydroxy poly(dimethyl,diphenyl)siloxane, α,ω-dihydroxy poly(dimethyl,methylphenyl)siloxane, or α,ω-dihydroxy polymethyltrifluoropropylsiloxane.

[0020] Specifically, the crosslinking agent includes one or more of tetraethyl orthosilicate, polyethyl orthosilicate, or methyltriethoxysilane.

[0021] Preferably, the base adhesive is α,ω-dihydroxypolydimethylsiloxane.

[0022] Preferably, the molecular weight of the α,ω-dihydroxypolydimethylsiloxane is 5,000 to 40,000.

[0023] Optionally, the preparation method of the modified ABX3 perovskite quantum dots includes the following steps:

[0024] S1. The organosilicon polymer was added to the ABX3 perovskite quantum dot solution and stirred to react;

[0025] Centrifuge at S2, discard the supernatant, collect the precipitate, and obtain modified ABX3 perovskite quantum dots.

[0026] Optionally, the mass ratio of the ABX3 perovskite quantum dots to the organosilicon polymer is 1:0.05-10; the stirring reaction time in S1 is 10-60 min; the centrifugation speed in S2 is 6000-15000 rpm; and the centrifugation time is 5-30 min.

[0027] Specifically, the mass ratio of the ABX3 perovskite quantum dots to the organosilicon polymer is 1:0.5 to 5.

[0028] Specifically, the concentration of the ABX3 perovskite quantum dots is 0.001–0.1 mmol / mL.

[0029] Specifically, the solvent in the ABX3 perovskite quantum dot solution is one or more of acetone, butanone, cyclohexanone, dichloromethane, chloroform, n-hexane, and ethyl acetate.

[0030] Optionally, the preparation method of the ABX3 perovskite quantum dots includes the following steps:

[0031] (1) Add cesium halide, lead halide and polar solvent to a beaker and dissolve them completely to obtain a mixed solution;

[0032] (2) Add ligand A and ligand B to the mixed solution and sonicate until completely dissolved to obtain the precursor solution;

[0033] (3) Add the precursor solution to a rapidly stirred nonpolar solvent and react to obtain a solution;

[0034] (4) Centrifuge, discard the supernatant, collect the precipitate, and obtain ABX3 perovskite quantum dots.

[0035] Optionally, the cesium halide is one or more of cesium chloride, cesium bromide, and cesium iodide, and the lead halide is one or more of lead chloride, lead bromide, and lead iodide; the molar ratio of cesium halide to lead halide is 1:1; ligand A is at least one of organic carboxylic acid ligands and organic phosphoric acid ligands; ligand B is at least one of organic primary amine ligands, organic secondary amine ligands, and organic tertiary amine ligands; the molar ratio of ligand A to ligand B is 1:0.1 to 10; and the total mass of cesium halide and lead halide is 0.05 to 5 times the total mass of ligand A and ligand B.

[0036] Specifically, the molar ratio of cesium halide to lead halide is 1:1 to generate ABX3 perovskite quantum dots with a three-dimensional structure.

[0037] Specifically, ligand A includes small organic molecules with carboxyl groups such as oleic acid, octyl phosphate, decanyl phosphate, octadecanoic acid, and hexadecanoic acid; ligand B includes small organic molecules with amino groups such as oleylamine, octadecylamine, hexadecylamine, and dodecylamine.

[0038] Preferably, the combined mass of the cesium halide and lead halide is four times the combined mass of ligand A and ligand B.

[0039] Specifically, the polar solvent is one or more of N,N-dimethylformamide, dimethyl sulfoxide, ethanol, and chloroform; the non-polar solvent is one or more of acetone, butanone, cyclohexanone, toluene, dichloromethane, chloroform, n-hexane, and ethyl acetate.

[0040] According to another aspect of this application, this application also provides a method for preparing the above-mentioned organosilicon luminescent elastomer based on perovskite quantum dots, comprising the following steps:

[0041] Modified ABX3 perovskite quantum dots were thoroughly mixed with a base adhesive, crosslinking agent, filler, and catalyst, poured into a mold, and vulcanized under natural environmental conditions to obtain an organosilicon luminescent elastomer based on perovskite quantum dots.

[0042] Specifically, the mold is a polytetrafluoroethylene mold.

[0043] According to another aspect of this application, this application also provides the application of the above-mentioned perovskite quantum dot-based organosilicon luminescent elastomer or the perovskite quantum dot-based organosilicon luminescent elastomer prepared by the above-mentioned preparation method in the preparation of X-ray imaging.

[0044] Specifically, the organosilicon luminescent elastomer based on perovskite quantum dots can be used to prepare X-ray imaging screens, which can be applied to fields such as medical diagnosis, public place security inspection, and inspection of internal circuits of chips.

[0045] The beneficial effects of this application include, but are not limited to:

[0046] 1. According to the perovskite quantum dot-based organosilicon luminescent elastomer of this application, by specifically defining each component and its proportion, an organosilicon luminescent elastomer based on perovskite quantum dots with good mechanical and fluorescent properties is obtained; by adding modified ABX3 perovskite quantum dots, they can participate in the crosslinking system, effectively anchor in the crosslinking network, and have good dispersibility and stability, reducing the aggregation and intersystem crosstalk of perovskite quantum dots, so as to achieve good luminescence intensity, luminescence uniformity, and continuity.

[0047] 2. According to the organosilicon luminescent elastomer based on perovskite quantum dots in this application, the preparation method of modified ABX3 perovskite quantum dots is specifically defined, and the reactants and their addition ratios are specifically defined. By using organosilicon polymers to passivate and modify ABX3 perovskite quantum dots, on the one hand, organosilicon polymers are non-toxic, harmless, resistant to high and low temperatures, weather-resistant, and possess good flexibility; on the other hand, the organosilicon luminescent elastomer system forms a cross-linked network through hydroxyl condensation. The organosilicon polymer modifies ABX3 perovskite quantum dots, introducing thiol, carboxyl, or amino groups. The active groups on the passivated perovskite quantum dots allow them to participate better in the cross-linked system of the organosilicon polymer, which is beneficial for dispersion and stability. The modified ABX3 perovskite quantum dots have better fluorescence intensity and better compatibility, avoiding the decrease in mechanical properties caused by phase separation and other problems.

[0048] 3. The preparation method of organosilicon luminescent elastomer based on perovskite quantum dots according to this application is simple, can be carried out under natural environmental conditions, and the raw materials are readily available, making it easy to promote on a large scale. Attached Figure Description

[0049] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0050] Figure 1 This is a transmission electron microscope image of the perovskite quantum dots involved in Example 1 of this application.

[0051] Figure 2 Images are of the perovskite quantum dot-based organosilicon luminescent elastomers described in Examples 1-4 of this application.

[0052] Figure 3 The organosilicon luminescent elastomer based on perovskite quantum dots involved in Embodiment 1 of this application is used as an X-ray imaging screen to capture images of electronic chips. Detailed Implementation

[0053] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The preferred embodiments and materials described in this patent are for illustrative purposes only.

[0055] Example 1

[0056] (1) Add 0.2 mmol of cesium bromide, 0.2 mmol of lead bromide and 5 mL of N,N-dimethylformamide to a beaker and dissolve them completely to obtain a mixed solution;

[0057] (2) Add 1.77 mmol oleic acid and 1.87 mmol g oleylamine to the mixed solution and sonicate until completely dissolved to obtain the precursor solution;

[0058] (3) Add 1 ml of precursor solution to toluene solvent with rapid stirring, and react for 5 minutes to obtain a solution;

[0059] (4) Centrifuge at 12,000 rpm for 10 minutes, discard the supernatant, collect the precipitate, and obtain CsPbBr3 perovskite quantum dots;

[0060] (5) Take 1g of CsPbBr3 perovskite quantum dots, add 0.2g of hydroxyl-terminated amino polysiloxane (number average molecular weight 3900) to the acetone solution of perovskite quantum dots under rapid stirring. The concentration of CsPbBr3 perovskite quantum dots in the acetone solution of perovskite quantum dots is 0.01mmol / ml. After reacting for 20min, centrifuge, discard the supernatant, collect the precipitate, and obtain modified perovskite quantum dots.

[0061] (6) 10 parts of modified perovskite quantum dots, 100 parts of base glue α,ω-dihydroxy polydimethylsiloxane (number average molecular weight 6000), 4 parts of crosslinking agent tetraethyl silicate, 20 parts of filler fumed silica and 0.5 parts of catalyst dibutyltin dilaurate are thoroughly mixed and poured into a polytetrafluoroethylene mold and vulcanized under natural environmental conditions to obtain an organosilicon luminescent elastomer based on perovskite quantum dots.

[0062] Example 2

[0063] (1) Add 0.13 mmol of cesium bromide and 0.067 mmol of cesium iodide, 0.13 mmol of lead bromide and 0.067 mmol of lead iodide and 5 mL of dimethyl sulfoxide to a beaker and dissolve completely to obtain a mixed solution;

[0064] (2) Add 1.77 mmol of oleic acid and 1.87 mmol of oleylamine to the mixed solution and sonicate until completely dissolved to obtain the precursor solution;

[0065] (3) Add 1 ml of precursor solution to acetone solvent with rapid stirring and react for 5 minutes to obtain a solution;

[0066] (4) Centrifuge at 12,000 rpm for 10 minutes, discard the supernatant, collect the precipitate, and obtain CsPbBr2I1 perovskite quantum dots;

[0067] (5) Take 1g of CsPbBr2I1 perovskite quantum dots, add 0.2g of hydroxyl-terminated mercaptopolysiloxane (number average molecular weight 2100) to a rapidly stirred perovskite quantum dot methyl ethyl ketone solution, the concentration of CsPbBr2I1 perovskite quantum dots in the perovskite quantum dot methyl ethyl ketone solution is 0.1mmol / ml, react for 20min and then centrifuge, discard the supernatant, collect the precipitate to obtain modified perovskite quantum dots;

[0068] (6) 10 parts of modified perovskite quantum dots, 100 parts of base glue α,ω-dihydroxy polydimethylsiloxane (number average molecular weight 6000), 4 parts of crosslinking agent tetraethyl silicate, 20 parts of filler fumed silica and 0.5 parts of catalyst dibutyltin dilaurate are thoroughly mixed and poured into a polytetrafluoroethylene mold and vulcanized under natural environmental conditions to obtain an organosilicon luminescent elastomer based on perovskite quantum dots.

[0069] Example 3

[0070] (1) Add 0.1 mmol of cesium bromide and 0.1 mmol of cesium iodide, 0.1 mmol of lead bromide and 0.1 mmol of lead iodide and 5 mL of N,N dimethylformamide to a beaker and dissolve completely to obtain a mixed solution;

[0071] (2) Add 0.17 mmol of oleic acid and 0.18 mmol of oleylamine to the mixed solution and sonicate until completely dissolved to obtain the precursor solution;

[0072] (3) Add 1 ml of precursor solution to dichloromethane solvent with rapid stirring, and react for 5 minutes to obtain a solution;

[0073] (4) Centrifuge at 12,000 rpm for 10 minutes using a high-speed centrifuge, discard the supernatant, collect the precipitate, and obtain CsPbBr. 1.5 I 1.5 Perovskite quantum dots;

[0074] (5) Take 1g of CsPbBr 1.5 I 1.5 Perovskite quantum dots: 0.2 g of hydroxyl-terminated carboxylated polysiloxane (number average molecular weight 3700) was added to a rapidly stirred perovskite quantum dot solution. The perovskite quantum dot solution contained CsPbBr. 1.5 I 1.5 The concentration of perovskite quantum dots was 0.01 mmol / ml. After reacting for 20 min, the mixture was centrifuged, the supernatant was discarded, and the precipitate was collected to obtain modified perovskite quantum dots.

[0075] (6) 10 parts of modified perovskite quantum dots, 100 parts of base glue α,ω-dihydroxy polydimethylsiloxane (number average molecular weight 6000), 4 parts of crosslinking agent tetraethyl silicate, 20 parts of filler fumed silica and 0.5 parts of catalyst dibutyltin dilaurate are thoroughly mixed and poured into a polytetrafluoroethylene mold and vulcanized under natural environmental conditions to obtain an organosilicon luminescent elastomer based on perovskite quantum dots.

[0076] Example 4

[0077] (1) Add 0.067 mmol of cesium bromide and 0.13 mmol of cesium iodide, 0.067 mmol of lead bromide and 0.13 mmol of lead iodide and 5 mL of N,N dimethylformamide to a beaker and dissolve completely to obtain a mixed solution;

[0078] (2) Add 0.0585 mmol of oleic acid and 0.0585 mmol of oleylamine to the mixed solution and sonicate until completely dissolved to obtain the precursor solution;

[0079] (3) Add 1 ml of precursor solution to butanone solvent and stir rapidly for 5 minutes to obtain a solution;

[0080] (4) Centrifuge at 12,000 rpm for 10 minutes, discard the supernatant, collect the precipitate, and obtain CsPbBr1I2 perovskite quantum dots;

[0081] (5) Take 1g of CsPbBr1I2 perovskite quantum dots, add 0.2g of hydroxyl-terminated trifluoropropyl polysiloxane (number average molecular weight 1800) to the rapidly stirred CsPbBr1I2 perovskite quantum dot solution, the concentration of CsPbBr1I2 perovskite quantum dots in the acetone solution of perovskite quantum dots is 0.01mmol / ml, react for 20min and then centrifuge, discard the supernatant, collect the precipitate, and obtain CsPbBr1I2 modified perovskite quantum dots;

[0082] (6) 10 parts of modified perovskite quantum dots, 100 parts of base glue α,ω-dihydroxy polydimethylsiloxane (number average molecular weight 6000), 4 parts of crosslinking agent tetraethyl silicate, 20 parts of filler fumed silica and 0.5 parts of catalyst dibutyltin dilaurate are thoroughly mixed and poured into a polytetrafluoroethylene mold and vulcanized under natural environmental conditions to obtain an organosilicon luminescent elastomer based on perovskite quantum dots.

[0083] Example 5

[0084] The difference between Example 5 and Example 1 is that in step (2), ligand A is 0.00739 mmol octadecanoic acid and ligand B is 0.0739 mmol octadecylamine; in step (5), the mass ratio of perovskite quantum dots to hydroxyl-terminated amino polysiloxane is 1:10; and in step (6), 100 parts of base adhesive, 20 parts of modified ABX3 perovskite quantum dots, 60 parts of filler, 15 parts of crosslinking agent and 6 parts of catalyst are included.

[0085] Example 6

[0086] The difference between Example 6 and Example 1 is that in step (2), ligand A is 7.64 mmol of oleic acid and ligand B is 0.764 mmol of oleylamine; in step (5), the mass ratio of perovskite quantum dots to hydroxyl-terminated amino polysiloxane is 1:0.05; and in step (6), 100 parts of base adhesive, 1 part of modified ABX3 perovskite quantum dots, 10 parts of filler, 1 part of crosslinking agent and 0.1 parts of catalyst are included.

[0087] Example 7

[0088] The difference between Example 7 and Example 1 is that the number average molecular weight of the organosilicon polymer in step (5) is 20,000, and the number average molecular weight of α,ω-dihydroxypolydimethylsiloxane in step (6) is 40,000. The rest are the same.

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that the ABX3 perovskite quantum dots used were not modified, while the rest were the same.

[0091] Comparative Example 2

[0092] The difference between Comparative Example 2 and Example 1 is that the perovskite quantum dots are MAPbI3 perovskite quantum dots, and all other aspects are the same.

[0093] Comparative Example 3

[0094] The difference between Comparative Document 3 and Example 1 is that the amount of modified ABX3 perovskite quantum dots added is 30 parts, and the rest are the same.

[0095] Experimental Example 1

[0096] The performance of the organosilicon luminescent elastomers based on perovskite quantum dots prepared in Examples 1-7 and Comparative Examples 1-3 was tested, and the test results are shown in Table 1.

[0097] Table 1 Performance Test Results

[0098] Group Tensile strength elongation Initial luminous intensity Luminous intensity after 48 hours Example 1 2.67MPa 310％ 100％ 90％ Example 2 2.54MPa 296％ 100％ 85％ Example 3 2.65MPa 284％ 100％ 87％ Example 4 2.71MPa 306％ 100％ 91％ Example 5 3.21MPa 282％ 100％ 88％ Example 6 2.16MPa 184％ 100％ 89％ Example 7 2.97MPa 320％ 100％ 92％ Comparative Example 1 2.01MPa 218％ 100％ 32％ Comparative Example 2 2.54MPa 267％ 100％ 14％ Comparative Example 3 1.46MPa 167％ 100％ 82％

[0099] According to Table 1, the organosilicon luminescent elastomers based on perovskite quantum dots obtained in Examples 1 to 7 exhibit excellent mechanical and fluorescence properties. The luminescence intensity can reach more than 85% after 48 hours, and the luminescence intensity in Example 7 can reach 92% after 48 hours, showing good luminescence stability. The tensile strength and elongation of Examples 1 to 7 are also significantly improved compared with Comparative Examples 1 to 3. In Comparative Example 1, the ABX3 perovskite quantum dots used were unmodified. The tensile strength, elongation, and luminescence intensity of the resulting perovskite quantum dot-based silicone luminescent elastomer all decreased significantly. The reason for this was that the unmodified ABX3 perovskite quantum dots had poor compatibility and fluorescence intensity stability, resulting in a significant decrease in the tensile strength of the silicone luminescent elastomer. In Comparative Example 2, the perovskite quantum dots used were MAPbI3 perovskite quantum dots. The luminescence intensity of the resulting silicone luminescent elastomer decreased significantly after 48 hours. The reason for this was that MAPbI3 perovskite quantum dots had poor stability, resulting in a significantly reduced luminescence duration. In Comparative Example 3, 30 parts of modified ABX3 perovskite quantum dots were added. Both the mechanical and fluorescence properties were affected. The reason for this was that the excessive addition of modified ABX3 perovskite quantum dots caused them to form a second phase within the polymer matrix, severely affecting the initial mechanical properties, significantly reducing the tensile strength, and also affecting the fluorescence properties.

[0100] according to Figures 1-3 , Figure 1 The image shown is a transmission electron microscope image of the perovskite quantum dots involved in Example 1 of this application. It can be seen that the obtained perovskite quantum dots have very uniform size and are cubic phase. Figure 2 Images of perovskite quantum dot-based organosilicon luminescent elastomers according to Examples 1-4 of this application show that different colors of perovskite quantum dot-based organosilicon luminescent elastomers can be obtained by adjusting the ratio of halogen anions. Figure 3 The image of the perovskite quantum dot-based organosilicon luminescent elastomer used in Example 1 of this application as an X-ray imaging screen is used to capture an image of an electronic chip. The image shows that the prepared perovskite quantum dot-based organosilicon luminescent elastomer film has very uniform fluorescence and high brightness, exhibiting excellent luminescent performance.

[0101] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. An organosilicon luminescent elastomer based on perovskite quantum dots, characterized in that, The product comprises, by weight, the following components: 100 parts base adhesive, 1-20 parts modified ABX3 perovskite quantum dots, 10-60 parts filler, 1-15 parts crosslinking agent, and 0.1-6 parts catalyst; wherein the modified ABX3 perovskite quantum dots contain A=Cs. + B = Pb 2+ X = Cl - ,Br - or I - ; The modified ABX3 perovskite quantum dots are obtained by modifying ABX3 perovskite quantum dots with organosilicon polymers. The organosilicon polymer includes hydroxyl-terminated mercaptopolysiloxane, hydroxyl-terminated trifluoropropylpolysiloxane, hydroxyl-terminated aminopolysiloxane, or hydroxyl-terminated carboxylpolysiloxane; the molecular weight of the organosilicon polymer is 1000-20000. The base adhesive is a hydroxyl-terminated polysiloxane or a dihydroxy polysiloxane; the filler is one or more of fumed silica, deposited silica, calcium carbonate, or talc; the crosslinking agent is a silane coupling agent with trifunctionality or higher, consisting of siloxy or silethoxy groups; and the catalyst is at least one of dibutyltin dilaurate or stannous octoate. The preparation method of the modified ABX3 perovskite quantum dots includes the following steps: S1. The organosilicon polymer was added to the ABX3 perovskite quantum dot solution and stirred to react; Centrifuge at S2, discard the supernatant, collect the precipitate, and obtain modified ABX3 perovskite quantum dots; The mass ratio of ABX3 perovskite quantum dots to organosilicon polymer is 1:0.05-10; the stirring reaction time in S1 is 10-60 min; the centrifugation speed in S2 is 6000-15000 rpm; and the centrifugation time is 5-30 min. The method for preparing the perovskite quantum dot-based organosilicon luminescent elastomer is characterized by the following steps: thoroughly mixing modified ABX3 perovskite quantum dots with a base adhesive, a crosslinking agent, a filler, and a catalyst, pouring the mixture into a mold, and vulcanizing it under natural environmental conditions to obtain the perovskite quantum dot-based organosilicon luminescent elastomer.

2. The organosilicon luminescent elastomer based on perovskite quantum dots according to claim 1, characterized in that, The preparation method of the ABX3 perovskite quantum dots includes the following steps: (1) Add cesium halide, lead halide and polar solvent to a beaker and dissolve them completely to obtain a mixed solution; (2) Add ligand A and ligand B to the mixed solution and sonicate until completely dissolved to obtain the precursor solution; (3) Add the precursor solution to a rapidly stirred nonpolar solvent and react to obtain a solution; (4) Centrifuge, discard the supernatant, collect the precipitate, and obtain ABX3 perovskite quantum dots.

3. The organosilicon luminescent elastomer based on perovskite quantum dots according to claim 2, characterized in that, The cesium halide is one or more of cesium chloride, cesium bromide, and cesium iodide; the lead halide is one or more of lead chloride, lead bromide, and lead iodide; the molar ratio of cesium halide to lead halide is 1:1; ligand A is at least one of organic carboxylic acid ligands and organic phosphoric acid ligands; ligand B is at least one of organic primary amine ligands, organic secondary amine ligands, and organic tertiary amine ligands; the molar ratio of ligand A to ligand B is 1:0.1 to 10; the total mass of cesium halide and lead halide is 0.05 to 5 times the total mass of ligand A and ligand B.

4. The application of the organosilicon luminescent elastomer based on perovskite quantum dots according to any one of claims 1 to 3 in the preparation of X-ray imaging.

Images