CN113388393B - Method for preparing InP@ZnS core-shell quantum dots through a high gravity reactor and the obtained InP@ZnS core-shell quantum dots - Google Patents

Abstract

The invention discloses a method for preparing InP@ZnS core-shell quantum dots through a hypergravity reactor and the obtained InP@ZnS core-shell quantum dots. According to the method, sulfur source, zinc source and InP core quantum dots are used as reaction precursor materials, long-chain carboxylic acid is used as a stabilizer, liquid paraffin is used as a solvent, and shell coating is carried out in a hypergravity reactor to obtain the InP@ZnS core-shell quantum dots. The method has the advantages of simple synthesis process, reduced reaction temperature and reaction time, saved cost, and environment friendliness due to the adoption of the green organic solvent liquid paraffin as the solvent in the shell coating process. The application of the hypergravity reactor not only greatly reduces the reaction time, but also plays a key role in the uniformity and the repeatability of the product, and the production process is quick, thereby being beneficial to large-scale industrial production.

Description

Method for preparing InP@ZnS core-shell quantum dots through a high-gravity reactor and the obtained InP@ZnS core-shell quantum dots

technical field

The invention belongs to the field of material synthesis. More specifically, it relates to a method for preparing InP@ZnS core-shell quantum dots through a hypergravity reactor and the obtained InP@ZnS core-shell quantum dots.

Background technique

Quantum dots are nanocrystals between bulk materials and molecules, composed of a small number of atoms, with a particle size of about 1-10nm. Due to its low toxicity and good luminescent properties based on quantum dots, InP quantum dots can be a good substitute for quantum dots containing cadmium and lead. The adjustable bandgap performance covers the entire visible light range. Currently, it has a very high application in the field of commercial electronic displays. prospect. However, pure InP quantum dots have a large specific surface area, and the existence of surface defects quenches their own luminescent properties. In the research field, an inorganic semiconductor shell with a large band gap is generally used to enhance its optical properties. Among them, Because the lattice mismatch ratio between ZnS and InP is small, which is 7.8%, ZnS is used as the shell coating material of InP quantum dots to improve the luminescence performance of the core-shell quantum dots. At present, the methods for coating ZnS shell on InP quantum dots mainly include thermal injection method and solvothermal method, but these methods have disadvantages. From the perspective of reaction conditions, long-term reaction temperature and reaction time and the use of toxic organic solvents limit its application. From an engineering perspective, low batch-to-batch repeatability, low output, and high cost are not conducive to commercial production of enterprises. . Therefore, it is of great research value to use economical raw materials and a simple, quick and cost-effective synthesis process to prepare InP@ZnS core-shell quantum dots by shell coating.

The so-called supergravity refers to the force (including gravitational or repulsive force) on matter in an environment much greater than the earth's gravitational acceleration (9.8m/s ² ). In the hypergravity environment, the molecular diffusion and interphase mass transfer process between molecules of different sizes are much faster than those in the conventional gravity field. The shearing force tears the liquid into micron to nanoscale liquid films, liquid filaments and droplets, resulting in a huge and rapidly renewed phase interface, which increases the mass transfer rate between phases by 1-3 orders of magnitude compared with that in traditional stirred tanks. Microscopic mixing and the mass transfer process are greatly enhanced. The present invention produces InP@ZnS core-shell quantum dots through the hypergravity method, which can effectively optimize particle uniformity and expand production scale.

Contents of the invention

Based on the above background technology, the present invention provides a method for preparing InP@ZnS core-shell quantum dots through a high-gravity reactor and the obtained InP@ZnS core-shell quantum dots. The application of the high-gravity reactor not only greatly reduces the reaction time, but also plays a key role in the uniformity and repeatability of the product. The production process is fast and conducive to large-scale industrial production.

In order to achieve the above object, the present invention adopts the following technical solutions:

One aspect of the present invention provides a method for preparing InP@ZnS core-shell quantum dots through a high-gravity reactor. The method uses sulfur sources, zinc sources and InP nuclear quantum dots as reaction precursor materials, and long-chain carboxylic acids as stabilizers. , liquid paraffin is an organic solvent, and the shell coating is carried out in a high-gravity rotating packed bed reactor to obtain InP@ZnS core-shell quantum dots.

In the InP@ZnS core-shell quantum dots described in the present invention, the "core" is InP core quantum dots, and the "shell" is ZnS.

Based on the method of the present invention, preferably, the method comprises the following steps:

Disperse the InP nuclear quantum dots in liquid paraffin to obtain an InP nuclear quantum dot solution; preferably, the concentration of the InP nuclear quantum dot solution is 0.5mol/L;

The zinc source is added to liquid paraffin, and oleic acid and the InP nuclear quantum dot solution are added to obtain a zinc precursor oil phase solution; preferably, this step is carried out in a protective gas atmosphere, such as a nitrogen atmosphere; or directly use nitrogen Just purging;

adding sulfur source and emulsifier into ultrapure water to obtain aqueous solution of sulfur precursor;

Adding the zinc precursor oil phase solution and the sulfur precursor aqueous phase solution into a high gravity reactor for shell coating;

A poor solvent is added to the mixture after the shell coating is completed for centrifugation, and the obtained precipitates are the InP@ZnS core-shell quantum dots. Preferably, the poor solvent is ethanol or acetone.

Based on the method of the present invention, preferably, the long-chain carboxylic acid is selected from one or a combination of two or more of stearic acid, myristic acid and oleic acid.

Based on the method of the present invention, preferably, the zinc source is selected from one or a combination of two or more of zinc stearate, zinc oleate and anhydrous zinc acetate.

Based on the method of the present invention, preferably, the sulfur source is selected from one or a combination of two or more of sodium sulfide nonahydrate, sodium sulfide pentahydrate and sodium sulfide anhydrous.

Based on the method of the present invention, preferably, the emulsifier is selected from one or a combination of two or more of Tween-20, Tween-80, Span-20 and Span-80.

Based on the method of the present invention, preferably, the zinc source concentration in the oil phase solution of the zinc precursor is 20mmol/L-100mmol/L; the volume ratio of the liquid paraffin and the stabilizer in the oil phase solution of the zinc precursor is (5-10): 1.

Based on the method of the present invention, preferably, the sulfur source concentration in the aqueous phase solution of the sulfur precursor is 20mmol/L-100mmol/L; the volume ratio of the emulsifier and ultrapure water is 1:(100-200) .

Based on the method of the present invention, preferably, the method further includes: dispersing the InP@ZnS core-shell quantum dots in an organic solvent to obtain a dispersion of InP@ZnS core-shell quantum dots.

Based on the method of the present invention, preferably, the organic solvent is selected from one of normal hexane, cyclohexane, toluene, liquid paraffin, dimethylsulfoxide, dimethylformamide, tetrahydrofuran, dichloromethane and chloroform or a combination of two or more.

Based on the method of the present invention, preferably, the high-gravity reactor is a high-gravity rotating packed-bed reactor; during the shell coating process, the rotating speed of the high-gravity rotating packed-bed reactor is 500rpm-2000rpm, so The coating time of the shell layer is 1s-60min.

Based on the method of the present invention, preferably, the zinc precursor oil phase solution and the sulfur precursor water phase solution are added to the high gravity reactor through a peristaltic pump; more preferably, the zinc precursor oil phase solution The feeding flow rate of the peristaltic pump corresponding to the aqueous phase solution of the sulfur precursor is 1: (0.5-2); the specific feeding is carried out at the same time.

Based on the method of the present invention, preferably, the InP nuclear quantum dots are prepared through the following steps:

Add tris(dimethylamino)phosphine, indium chloride, zinc chloride, oleylamine and toluene into the liner of the PTFE-lined hydrothermal kettle, then put it into the hydrothermal kettle, and heat it in an oven at 150-180℃ Under the condition of reaction 6-48h;

A poor solvent is added to the mixture after the reaction for centrifugation, and the resulting precipitate is the InP nuclear quantum dot; the poor solvent is preferably absolute ethanol or acetone, and the poor solvent is added to precipitate the product.

Based on the method of the present invention, preferably, the tris(dimethylamino)phosphine and indium chloride are weighed according to the molar ratio of P:In element is (0.5-2):1, for example (1-2): 1, preferably 2:1. The zinc chloride is weighed according to the molar ratio of Zn:In element being (0.5-2):1, for example (0.5-1):1, preferably 1:1. Preferably, the volume ratio of oleylamine to toluene is 3:8.

In addition, the specification of the used hydrothermal kettle is 50-200mL, and at this time, the amount of toluene added is 24-80mL.

The present invention adopts the hypergravity method, and compared with the thermal injection method and solvothermal method used in the current commercial InP@ZnS core-shell quantum dots, it has obvious improvements in quantum dot reaction conditions, size controllable, green products and mass production. . This method uses liquid paraffin as an organic solvent in the coating process of the shell layer. Compared with organic solvents such as original n-hexane, toluene and chloroform, its advantages of stable properties, non-toxic harmlessness and low cost ensure that laboratory preparation and large-scale Large-scale industrial production.

The present invention provides a preferred solution here, a method for preparing InP@ZnS core-shell quantum dots through a high-gravity rotating packed bed reactor. This method uses tris(dimethylamino)phosphine, indium chloride, and zinc chloride as The reactants, oleylamine as a stabilizer, and toluene as a solvent, prepare InP nuclear quantum dots in a hydrothermal kettle; then use sodium sulfide nonahydrate, zinc stearate and InP nuclear quantum dots as reaction precursor materials, long-chain carboxylic Acid is a stabilizer, liquid paraffin is an organic solvent, and the precursor solution is passed into a high-gravity rotating packed bed reactor for shell coating. Concrete preparation comprises the following steps:

1) Take tris(dimethylamino)phosphine, indium chloride and zinc chloride in the inner tank of a hydrothermal kettle lined with polytetrafluoroethylene, add oleylamine and toluene, put them into a hydrothermal kettle, and place them in an oven at 180 ℃ reaction 24h.

2) adding a large amount of absolute ethanol to the mixture to separate in a centrifuge, and the separated product is dispersed in liquid paraffin after ultrasonic treatment to obtain an InP nuclear quantum dot solution.

3) Add zinc stearate as zinc source to liquid paraffin, add quantitative oleic acid and InP nuclear quantum dots after nitrogen treatment, and stir at a certain temperature to obtain a zinc precursor oil phase solution.

4) Using sodium sulfide nonahydrate as a sulfur source, adding an emulsifier into ultrapure water, and stirring at room temperature to obtain a sulfur precursor aqueous solution.

5) Pass the zinc precursor oil phase solution prepared in step 3) and the sulfur precursor aqueous phase solution prepared in step 4) into the supergravity rotating packed bed reactor through a peristaltic pump at the same time, in the supergravity environment Carry out the cladding of shell layer below.

6) After the shell coating process is completed, the mixture of the zinc precursor oil phase solution and the sulfur precursor water phase solution is separated in a centrifuge by adding a large amount of absolute ethanol, and the separated product is dispersed in an organic reagent after ultrasonic treatment. , the final product InP@ZnS core-shell quantum dot dispersion was obtained.

Another aspect of the present invention also provides an InP@ZnS core-shell quantum dot prepared by the above method.

According to the InP@ZnS core-shell quantum dot of the present invention, preferably, the emission spectrum of the InP@ZnS core-shell quantum dot is 540nm-700nm.

According to the InP@ZnS core-shell quantum dots of the present invention, preferably, the particle size distribution of the InP@ZnS core-shell quantum dots is concentrated at 3-7 nm.

The method of the present invention adopts a high-gravity rotating packed bed reactor to prepare InP@ZnS core-shell quantum dots, and the characterization results of transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD) show that: Compared with the traditional preparation method of quantum dots, the present invention utilizes a high-gravity rotating packed bed reactor to enhance mass transfer, coats the ZnS shell on the InP core at low temperature and in a short time, and prepares a uniform, stable, long-lived fluorescent quantum dot in an organic InP@ZnS core-shell quantum dots with good dispersion effect in solvent. Wherein, using liquid paraffin as the organic solvent in the reaction medium makes the reaction process green and environment-friendly and the particle size distribution is concentrated at 3-7nm.

Description of drawings

Figure 1 is the emission spectrum of InP@ZnS core-shell quantum dots prepared in Example 1.

2 is an X-ray diffraction (XRD) pattern of InP@ZnS core-shell quantum dots prepared in Example 1.

3 is an X-ray photoelectron spectroscopy (XPS) spectrum of InP@ZnS core-shell quantum dots prepared in Example 1.

FIG. 4 is a transmission electron microscope (TEM) image of InP@ZnS core-shell quantum dots prepared in Example 1.

FIG. 5 is a high-resolution transmission electron microscope (HRTEM) image of InP@ZnS core-shell quantum dots prepared in Example 1.

6 is a photo of the dispersion of InP@ZnS core-shell quantum dots prepared in Example 1 under sunlight and 365nm excitation light.

Fig. 7 is a particle size distribution analysis diagram of InP@ZnS core-shell quantum dots prepared in Example 1.

Fig. 8 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dots prepared in Example 2.

Fig. 9 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dots prepared in Example 3.

Fig. 10 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dots prepared in Example 4.

Fig. 11 is the emission spectrum of InP@ZnS core-shell quantum dots prepared in Example 5.

Figure 12 is the emission spectrum of InP@ZnS core-shell quantum dots prepared in Comparative Example 1.

13 is a transmission electron microscope (TEM) image of InP@ZnS core-shell quantum dots prepared in Comparative Example 1.

Figure 14 is the emission spectrum of InP@ZnS core-shell quantum dots prepared in Comparative Example 2.

15 is a transmission electron microscope (TEM) image of InP@ZnS core-shell quantum dots prepared in Comparative Example 2.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

All numerical designations (eg, temperature, time, concentration, and weight, etc., including ranges for each) herein may generally be approximated by changing (+) or (-) in increments of 0.1 or 1.0 as appropriate. All numerical designations are to be understood as being preceded by the term "about".

Example 1

In this example, InP@ZnS core-shell quantum dots were prepared by a high-gravity rotating packed bed reactor, which specifically included the following steps:

Weigh 0.8g (3.6mmol) indium chloride and 0.48g (3.6mmol) zinc chloride into a 100mL polytetrafluoroethylene liner, add 12mL oleylamine, 32mL toluene and 1mL (7.2mmol) tris(dimethylamino) Phosphine, sealed and placed in a hydrothermal kettle, heated in an oven at 180°C for 24 hours, and the mixture was purified by adding ethanol to obtain InP nuclear quantum dots.

Add 0.632g (1mmol) zinc stearate to a 250mL three-necked flask, and disperse the obtained InP nuclear quantum dots in 50mL liquid paraffin under a nitrogen atmosphere and inject them into the three-necked flask, then inject 5mL of oleic acid and heat to 80°C under magnetic stirring Continued for 20 minutes, and the obtained zinc precursor oil phase solution was designated as solution A.

Add 0.5g (2.1mmol) sodium sulfide nonahydrate and 75mL ultrapure water into a 100mL beaker, add 1.5mL Tween-20, shake and dissolve to obtain the sulfur precursor aqueous solution, which is designated as solution B.

Set the rotation speed of the high gravity rotating packed bed reactor to 1000rpm, set the feed flow rate of solution A and solution B in the peristaltic pump to 2:3, pass solutions A and B into the high gravity rotating packed bed reactor through the peristaltic pump, The exiting solution was collected immediately. Add absolute ethanol and centrifuge to separate and purify three times, and the obtained precipitate is ultrasonically dispersed in n-hexane to obtain the final product InP@ZnS core-shell quantum dot dispersion.

Figure 1 is the emission spectrum of the obtained InP@ZnS core-shell quantum dots, and its emission peak is 640nm, showing orange light. Figure 2 is the X-ray diffraction (XRD) pattern of the obtained InP@ZnS core-shell quantum dots. There are InP matching peaks in the obtained product, and the crystal form is good. Figure 3 is the X-ray photoelectron spectroscopy (XPS) spectrum of the obtained InP@ZnS core-shell quantum dots, in which there are In, P, Zn, and S elements. In addition, the InP core and ZnS quantum dots themselves do not emit light, while The product prepared in this example emits light, which proves that the InP core quantum dots are successfully coated with the ZnS shell, and the obtained product is InP@ZnS core-shell quantum dots. Figure 4 is a transmission electron microscope (TEM) image of the obtained InP@ZnS core-shell quantum dots, and the core-shell quantum dots have good dispersion. Figure 5 is the high-resolution transmission electron microscope (HRTEM) image of the obtained InP@ZnS core-shell quantum dots, from which the average particle size of the quantum dots can be estimated to be 5.1nm; Figure 6 is the sunlight of the obtained InP@ZnS core-shell quantum dots And the photos of the dispersion under 365nm excitation light, it can be seen that the prepared core-shell quantum dots have fluorescence and the fluorescence effect is strong. Figure 7 is an analysis diagram of the particle size distribution of the obtained InP@ZnS core-shell quantum dots, and the particle size distribution is concentrated at 3-7nm.

Example 2

The injection amount of oleic acid in Example 1 was changed to 7.5mL and 10mL, and all the other reaction processes and conditions were unchanged.

Figure 8 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dot dispersions prepared when the injection volume of oleic acid was 5mL, 7.5mL and 10mL. The fluorescence quantum yield of the InP@ZnS core-shell quantum dot dispersion is the largest.

Example 3

Change the injection amount of oleic acid in Example 1 to 7.5mL, immediately collect the discharge solution and change to collect the discharge solution after 15 minutes of circulation and collect the discharge solution after 30 minutes of circulation, and the remaining reaction processes and conditions remain unchanged.

Figure 9 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dot dispersions prepared when the cycle reaction time is 0 minutes, 15 minutes and 30 minutes. It can be seen from Figure 9 that when the cycle reaction time is 30 minutes, the The fluorescence quantum yield of the InP@ZnS core-shell quantum dot dispersion is the largest.

Example 4

Change the injection amount of oleic acid in Example 1 to 7.5mL, immediately collect the discharge solution and change it to circulation for 30 minutes to collect the discharge solution, change the rotating packed bed reactor speed of high gravity to 1500rpm and 2000rpm, and the remaining reaction processes and conditions constant.

Figure 10 is a comparison chart of fluorescence quantum yields of InP@ZnS core-shell quantum dot dispersions prepared at 1000rpm, 1500rpm, and 2000rpm at the hypergravity level. The fluorescence quantum yield of the shell quantum dot dispersion is the largest.

Example 5

In this example, InP@ZnS core-shell quantum dots were prepared by a high-gravity rotating packed bed reactor, which specifically included the following steps:

Weigh 0.8g (3.6mmol) indium chloride and 0.48g (3.6mmol) zinc chloride into a 100mL polytetrafluoroethylene liner, add 12mL oleylamine, 32mL toluene and 1mL (7.2mmol) tris(dimethylamino) Phosphine, sealed and placed in a hydrothermal kettle, heated in an oven at 180°C for 24 hours, and the mixture was purified by adding ethanol to obtain InP nuclear quantum dots.

Add 0.632g (1mmol) zinc stearate in a 250mL three-necked flask, and disperse the gained InP nuclear quantum dots in 50mL liquid paraffin and inject the three-necked flask under a nitrogen atmosphere, then inject 7.5mL of oleic acid and heat to The temperature was maintained at 120°C for 20 minutes, and the obtained zinc precursor oil phase solution was designated as solution A.

Add 0.5g (2.1mmol) sodium sulfide nonahydrate and 75mL ultrapure water into a 100mL beaker, add 1.5mL Tween-20, shake and dissolve to obtain the sulfur precursor aqueous solution, which is designated as solution B.

Set the rotation speed of the high-gravity rotating packed bed reactor to 1000rpm, set the feed flow rate of solution A and solution B in the peristaltic pump to 2:3, and pass the solutions A and B into the high-gravity rotating packed bed reactor through the peristaltic pump for circulation The exiting solution was collected after 30 minutes. Add absolute ethanol for separation and purification three times, and the obtained precipitate is ultrasonically dispersed in n-hexane to obtain the final product InP@ZnS core-shell quantum dot dispersion.

Figure 11 is the emission spectrum of the obtained InP@ZnS core-shell quantum dots, and its emission peak is 700nm, showing red light.

Comparative example 1

In this example, InP@ZnS core-shell quantum dots are prepared through a hydrothermal kettle, which specifically includes the following steps:

Weigh 0.8g (3.6mmol) indium chloride and 0.48g (3.6mmol) zinc chloride into a 100mL polytetrafluoroethylene liner, add 12mL oleylamine, 32mL toluene and 1mL (7.2mmol) tris(dimethylamino) Phosphine, sealed and placed in a hydrothermal kettle, heated in an oven at 180°C for 24 hours, and the mixture was purified by adding ethanol to obtain InP nuclear quantum dots.

Weigh 0.2g (1.5mmol) of zinc chloride into a 100mL PTFE liner, add 0.72mL of dodecyl mercaptan, 5mL of toluene, 1mL of oleylamine and 3mL of InP nuclear quantum dot solution, seal it and place it in a hydrothermal The kettle was heated in an oven at 180°C for 6h. The mixture was added to absolute ethanol for separation and purification three times, and the obtained precipitate was ultrasonically dispersed in n-hexane to obtain the final product InP@ZnS core-shell quantum dot dispersion.

Figure 12 is the emission spectrum of the obtained InP@ZnS core-shell quantum dots, and its emission peak is 606nm, showing orange light.

Figure 13 is a transmission electron microscope (TEM) image of the obtained InP@ZnS core-shell quantum dots, and the core-shell quantum dots have good dispersion.

Comparative example 2

In this example, InP@ZnS core-shell quantum dots are prepared through a beaker, which specifically includes the following steps:

Weigh 0.8g (3.6mmol) indium chloride and 0.48g (3.6mmol) zinc chloride into a 100mL polytetrafluoroethylene liner, add 12mL oleylamine, 32mL toluene and 1mL (7.2mmol) tris(dimethylamino) Phosphine, sealed and placed in a hydrothermal kettle, heated in an oven at 180°C for 24 hours, and the mixture was purified by adding ethanol to obtain InP nuclear quantum dots.

Add 0.632g (1mmol) zinc stearate to a 250mL three-necked flask, and disperse the obtained InP nuclear quantum dots in 50mL liquid paraffin under a nitrogen atmosphere and inject them into the three-necked flask, then inject 5mL of oleic acid and heat to 80°C under magnetic stirring Continued for 20 minutes, and the obtained zinc precursor oil phase solution was designated as solution A.

Add 0.5g (2.1mmol) sodium sulfide nonahydrate and 75mL ultrapure water into a 100mL beaker, add 1.5mL Tween-20, shake and dissolve to obtain the sulfur precursor aqueous solution, which is designated as solution B.

Inject solution B into the three-necked flask containing solution A through a 50mL syringe. After reacting for 15 minutes, pour the product in the three-necked flask into a 250mL beaker, add absolute ethanol and centrifuge and purify for 3 times, and the precipitate obtained is dispersed in n-hexane by ultrasonic , to obtain the final product InP@ZnS core-shell quantum dot dispersion.

Figure 14 is the emission spectrum of the obtained InP@ZnS core-shell quantum dots, and its emission peak is 620nm, showing orange light.

Figure 15 is a transmission electron microscope (TEM) image of the obtained InP@ZnS core-shell quantum dots. The core-shell quantum dots have agglomeration and poor dispersion.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those of ordinary skill in the art can also make It is not possible to exhaustively list all the embodiments here, and any obvious changes or changes derived from the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims (1)

1. A method for preparing InP@ZnS core-shell quantum dots by a hypergravity reactor, characterized in that, Weigh 0.8g of indium chloride and 0.48g of zinc chloride into a 100mL PTFE liner, add 12mL of oleylamine, 32mL of toluene and 1mL of tris(dimethylamino)phosphine, seal it and place it in a hydrothermal kettle in an oven Heating at 180°C for 24 hours, adding ethanol to the mixture to obtain InP nuclear quantum dots; Add 0.632g of zinc stearate to a 250mL three-necked flask, and disperse the obtained InP nuclear quantum dots in 50mL of liquid paraffin into the three-necked flask under a nitrogen atmosphere, then inject 7.5mL of oleic acid and heat to 80°C under magnetic stirring for 20 Minutes, the obtained zinc precursor oil phase solution is denoted as solution A; Add 0.5g of sodium sulfide nonahydrate and 75mL of ultrapure water into a 100mL beaker, add 1.5mL of Tween-20, and shake and dissolve to obtain an aqueous solution of the sulfur precursor as solution B; Set the rotation speed of the high-gravity rotating packed bed reactor to 2000rpm, set the feed flow rate of solution A and solution B in the peristaltic pump to 2:3, pass solutions A and B into the high-gravity rotating packed bed reactor through the peristaltic pump, After circulating for 30 minutes, the output solution was collected; absolute ethanol was added to centrifuge and purified three times, and the obtained precipitate was ultrasonically dispersed in n-hexane to obtain the final product InP@ZnS core-shell quantum dot dispersion.

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