KR20220130401A - Quantum dot continuous mass synthesis method and quantum dot continuous mass synthesis device used therein - Google Patents

Abstract

The present invention relates to a method for continuous mass synthesis of quantum dots, which includes: a step (step 1) of preparing a first precursor solution and a second precursor solution; and a step (step 2) of forming quantum dots by continuously injecting the first precursor solution and the second precursor solution at a constant injection rate in directions facing each other. The method is performed at room temperature without a separate temperature treatment process by using a continuous mass synthesis device for quantum dots manufactured by a simple method of connecting tubes connected to a diaphragm pump using a connecting member. Thus, compared to the conventional synthesis method of quantum dots, the method of the present invention is simple and economical. Through a simple process of controlling the Reynolds number by adjusting the injection rate of the precursor solution, it is possible to overcome the limitations of the conventional colloid synthesis method and the method using a micro platform and shorten the reaction time to continuously mass-produce quantum dots of uniform size and excellent optical properties to a level suitable for commercialization. Thus, quantum dots can be rapidly supplied to various fields using quantum dots.

Description

Quantum dot continuous mass synthesis method and quantum dot continuous mass synthesis device used therein

The present invention relates to a continuous mass synthesizing method and apparatus for quantum dots, and more particularly, by continuously injecting a precursor solution using a diaphragm pump and a damper, and controlling the flow rate of the diaphragm pump to form turbulence according to the Reynolds number And, by controlling the injection rate of the precursor solution, it relates to a continuous mass synthesis method for synthesizing small and uniform quantum dots at a high speed, and a synthesis apparatus used therein.

In the display market, from CRT to PDP, LCD, and OLED, the thickness is getting thinner and the picture quality is developing clearly. Here, OLED has been studied a lot thanks to the advantage that it can make the thickness of the display thin by using a device that receives light and emits light without the need for a backlight. However, since the OLED uses an organic material that is weak to light and heat as a light emitting layer, brightness and color reproducibility decrease when the usage time increases, and burn-in occurs when the same screen is maintained for a long time.

In order to solve this problem, quantum dots, which are inorganic light emitting devices, have begun to attract attention as a next-generation display. Quantum dot (QD), an inorganic light emitting device, has advantages of low price and long lifespan compared to organic materials. Due to its ability to compose colors, it is receiving great attention in the display field, and besides, it can be used in various fields such as a light absorption layer of a solar cell, a biosensor, and lighting, so a lot of research is being conducted.

The quantum dot synthesis method can be roughly divided into two types: a top-down method and a bottom-up method. First, the top-down method uses a physical method to fragment a bulk material down to nanometers to form three-dimensional particles into a lower-dimensional form. A representative method is lithography. The top-down method has the advantage of being able to precisely control the size and arrange it in a desired position, but there are difficulties in the inclusion of impurities, structural instability, and implementation of particles having a size of 10 nm or less. In general, since the size of semiconductor nanoparticles is smaller than 10 nm, it is difficult to implement quantum dots subjected to quantum confinement in a top-down manner.

Therefore, currently, most quantum dots are mainly synthesized in a bottom-up method using chemical molecules or atoms as starting materials in a solution state to synthesize quantum dots.

1a) is a schematic diagram of a colloidal synthesis method mainly used for mass synthesis of conventional quantum dots.

The colloid synthesis method is a method in which a low-temperature precursor solution is injected into a high-temperature precursor solution and the reaction proceeds through mixing, whereby quantum dots are formed while being nucleated in a hot solution. Since the colloidal synthesis method puts precursor solutions at once and reacts, quantum dots can be synthesized simply if the conditions are precisely met, but mixing does not occur uniformly and the reaction process has to be optimized again if the size of the reactor is increased. , has a problem in that the reproducibility of the optical properties of quantum dots made under the same conditions in different reactors is also low.

FIG. 1 b) is a schematic diagram of a method using a micro platform among methods for improving the colloid synthesis method described above.

Referring to FIG. 1 b), the method using the micro-platform is a method of synthesizing quantum dots by manufacturing a micro-platform using micro-molding and adjusting the flow rate ratio of the injected precursor solution. After the solution is introduced and the precursor solution is mixed in the mixing section, nucleation and particle growth are performed in the straight section to synthesize quantum dots.

The method using the micro-platform enables rapid mixing of reagents, and control of the mixing time by controlling the flow rate to precisely control the particle size, consumes a relatively small amount of reagent, and produces various combinations of particles in a short time. It can be made efficiently in the inside, but since it is synthesized using a syringe pump when controlling the flow rate, it is difficult to see it as a practically continuous process. There is a limit to not being able to.

Meanwhile, the domestic quantum dot display market is expected to grow five times in the next 10 years. Therefore, continuous research and development of quantum dots is required, and a synthesis method for mass production of quantum dots is needed to meet the demand of the upcoming QLED market. It is required to develop a continuous mass quantum dot synthesis method that can be synthesized and a continuous mass quantum dot synthesis device with enhanced convenience through simple assembly without a separate mold or instrument manufacturing process.

Republic of Korea Patent Publication No. 10-2018-0075724

One object of the present invention is to prepare a first precursor solution and a second precursor solution (step 1); and continuously injecting the first precursor solution and the second precursor solution in directions facing each other at a constant injection rate to form quantum dots (step 2); and, in step 2, the first precursor solution and The second precursor solution is mixed to form a turbulence and discharged at a constant discharge rate, and the Reynolds number (Re) at which the first precursor solution and the second precursor solution form a turbulence is 200 to 100,000, and It is to provide a continuous mass synthesis method of quantum dots, characterized in that represented by Equation 1:

[Equation 1]

(In Equation 1 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first precursor solution and the second precursor solution,

υ is the exit rate of the first precursor solution and the second precursor solution,

W is the width of the outlet through which the first precursor solution and the second precursor solution are discharged.)

Another object of the present invention is a tube fitting part in which quantum dots are synthesized by collision and mixing of a precursor solution continuously injected at a constant injection rate from both sides facing each other, and a pair of pairs located on both sides around the tube fitting part. a precursor solution supply unit; a pair of injection tubes respectively connected to the pair of precursor solution supply parts to inject the precursor solution into the tube fitting part; and a discharge tube connected to the tube fitting part in a direction crossing a position where the pair of injection tubes are connected to discharge the mixed precursor solution inside the tube fitting part; It is to provide a continuous mass synthesizing apparatus for quantum dots, characterized in that the turbulence determined by a specific Reynolds number is formed by controlling the injection rate of the precursor solution introduced into the part.

In order to achieve the above object, an aspect of the present invention comprises the steps of preparing a first precursor solution and a second precursor solution (step 1); and continuously injecting the first precursor solution and the second precursor solution in directions facing each other at a constant injection rate to form quantum dots (step 2); and, in step 2, the first precursor solution and The second precursor solution is mixed to form a turbulence and discharged at a constant discharge rate, and the Reynolds number (Re) at which the first precursor solution and the second precursor solution form a turbulent flow is 200 to 100,000, and the following equation It provides a continuous mass synthesis method of quantum dots, characterized in that represented by 1:

[Equation 1]

(In Equation 1 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first precursor solution and the second precursor solution,

υ is the exit rate of the first precursor solution and the second precursor solution,

W is the width of the outlet through which the first precursor solution and the second precursor solution are discharged.)

Another aspect of the present invention is a tube fitting part in which quantum dots are synthesized by collision and mixing of a precursor solution continuously injected at a constant injection rate from both sides facing each other, and a pair of pairs located on both sides around the tube fitting part. a precursor solution supply unit; a pair of injection tubes respectively connected to the pair of precursor solution supply parts to inject the precursor solution into the tube fitting part; and a discharge tube connected to the tube fitting part in a direction crossing a position where the pair of injection tubes are connected to discharge the mixed precursor solution inside the tube fitting part; Provided is a continuous mass synthesizing apparatus for quantum dots, characterized in that the turbulence determined by a specific Reynolds number is formed by controlling the injection rate of the precursor solution introduced into the unit.

The continuous mass synthesis method of quantum dots of the present invention is performed at room temperature without a separate temperature treatment process using a continuous mass synthesis apparatus of quantum dots manufactured by a simple method of connecting a tube connected to a diaphragm pump using a connecting member. Compared to the synthesis method of quantum dots, it is simple and economical.

In addition, it is a simple process of controlling the Reynolds number through control of the injection rate of the precursor solution, overcoming the limitations of the conventional colloid synthesis method and the method using a micro platform, and shortening the reaction time to achieve uniform size and optical properties Since it is possible to mass-produce excellent quantum dots to a level suitable for continuous commercialization, it is possible to rapidly supply quantum dots to various fields using quantum dots.

1 is a schematic diagram of a conventional quantum dot synthesis method.
2a) is a schematic diagram of a basic quantum dot structure, b) is a diagram showing energy level states in metals and semiconducting materials, and c) is a diagram illustrating emission wavelength colors according to the quantum dot size.
3 is a flowchart of a method for continuous mass synthesis of quantum dots of the present invention.
4 is a schematic diagram of a continuous mass synthesizing apparatus for quantum dots of the present invention.
5 is a component (a), a photograph (b) and a schematic diagram (c) of a continuous mass synthesizing apparatus of quantum dots according to an embodiment of the present invention.
6 a) is a photograph of the laminar flow test result of the continuous mass synthesizing apparatus of quantum dots of the comparative experimental example of the present invention, and b) is a photograph of the turbulence experiment result of the continuous mass synthesizing apparatus of quantum dots of the present invention.
7 a) is a TEM image and size distribution of quantum dots synthesized using a conventional batch reactor of a comparative example of the present invention, b) and c) are quantum dots synthesized using a continuous mass synthesis method of quantum dots of an embodiment TEM image and size distribution of
FIG. 8 a) is a reference peak of an XRD diffraction pattern of CdS, and b) is an XRD analysis result of quantum dots synthesized using the continuous mass synthesis method of quantum dots of one embodiment and a comparative example of the present invention.
9 is a UV spectrum (a), luminescence intensity graph (b) and photoluminescence of quantum dots synthesized using a continuous mass synthesis method of quantum dots synthesized using a batch reactor of a comparative example of the present invention and quantum dots of Examples ) is the photo (c).

As used herein, “preferred” and “preferably” refer to embodiments of the invention that may provide certain advantages under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. Additionally, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

Each step may occur in a different order than the stated order unless the context clearly dictates a specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All technical and scientific terms used herein have the meanings commonly understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise defined. All terms used herein are selected for the purpose of more clearly describing the present invention and not to limit the scope of the present invention.

Throughout this specification, unless the context requires otherwise, the terms "comprises" and "comprising" include the steps or elements presented, or groups of steps or elements, but include any other step or element, or It is to be understood that a step or group of elements is meant to be implied not to be excluded.

Hereinafter, the present invention will be described in detail.

As used herein, quantum dots (QDs) refer to semiconductor crystals with a size of less than 10 nm, appeared in the early 1970s and reported as “Semiconductor Crystallites” by Louis Brus of Bell laboratory in the 1980s, and later at Yale University. It was named quantum dot by Professor Mark Reed.

The quantum dot has the advantage of being cheaper and having a longer lifespan compared to organic materials, and it is a device that emits light without an external light source and can obtain high color purity due to a narrow emission wavelength, thanks to the characteristic that can compose a clear color than OLED display It is receiving great attention in various fields such as the light absorption layer of solar cells, biosensors, and lighting.

2 a) is a schematic diagram of a basic quantum dot structure.

Referring to FIG. 2 , the quantum dot is composed of a core, a shell, and a ligand. The core is a part where light emission occurs substantially, and the size of the core plays a role in determining the emission wavelength. have. In addition, the ligand serves to prevent dispersibility and aggregation of quantum dots.

FIG. 2 b) is a diagram showing the state of energy levels in metals and semiconducting materials, and FIG. 2 c) is a diagram showing emission wavelength colors according to the size of quantum dots.

Referring to b) and c) of FIG. 2 , as the size of the semiconducting material particles decreases, the energy density is quantized and it can be seen that the band gap increases. This indicates that quantum dots are intermediate between atoms with discontinuous electron energy density and bulk crystals with continuous energy bands, and are subject to quantum confinement.

The quantum confinement effect refers to a phenomenon observed when the particle size of a semiconductor material is smaller than the exciton Bohr radius and is affected by the atomic structure change. Because the motion is limited, the quantum effect is felt in all directions, and the energy level of the material has a discontinuous value in all directions, thereby greatly affecting the optical and electrical properties of the semiconductor material. As the size decreases, the discontinuity of the energy level increases, and as a result, the energy bandgap of the quantum dot increases.

Due to the quantum confinement effect, as the size decreases, the movement of the energy level is restricted, and the band gap increases to emit short-wavelength blue light. Conversely, as the size increases, short-wavelength red light is emitted.

An object of the present invention is to provide a method and apparatus for synthesizing quantum dots that are sufficiently small in size to exhibit the quantum confinement effect and form uniform particles, shorten the reaction time, and are suitable for mass production and continuous process. do.

One aspect of the present invention provides a method for continuous mass synthesis of quantum dots.

3 is a flowchart of a method for continuous mass synthesis of quantum dots of the present invention.

3, the continuous mass synthesis method of quantum dots of the present invention comprises the steps of preparing a first precursor solution and a second precursor solution (step 1); and continuously injecting the first precursor solution and the second precursor solution in directions facing each other at a constant injection rate to form quantum dots (step 2); and, in step 2, the first precursor solution and The second precursor solution is characterized in that it is mixed while forming a turbulent flow and discharged at a constant discharge rate.

First, the continuous mass synthesis method of quantum dots of the present invention includes a step (step 1) of preparing a first precursor solution and a second precursor solution.

In an embodiment of the present invention, step 1 is performed by directly preparing a precursor solution in which an element constituting a quantum dot is dissolved in a solvent, for example, oleylamine, etc. in an appropriate way, or a commercially available precursor solution This can be done by purchasing

In this case, step 1 may be used without limitation, as long as it is a process for preparing a precursor solution or a precursor solution prepared using an element, a solvent, or the like constituting a quantum dot, which is obvious in the technical field of the present invention.

In one embodiment of the present invention, the first precursor solution and the second precursor solution are each element constituting a quantum dot, for example, cadmium (Cd), zinc (Zn), mercury (Hg), indium (In), gallium (Ga), selenium (Se), sulfur (S), telenium (Te), lead (Pb), phosphorus (P), and may include any one or more selected from the group consisting of arsenic (As), In addition, depending on the elements included in the first precursor solution and the second precursor solution, the types of quantum dots synthesized using the continuous mass synthesis method of quantum dots of the present invention may be different.

For example, the synthesized quantum dots are cadmium selenide (CdSe), cadmium sulfide (CdS), cadmium telleride (CdTe), zinc selenide (ZnSe), zinc telleride (ZnTe), zinc sulfide (ZnS), mercury It may be any one of telelide (HgTe), indium arsenide (InAs), indium phosphorus (InP), and gallium arsenide (GaAs), but is not limited thereto.

As a specific example, when the first precursor solution is a cadmium precursor solution containing cadmium, and the second precursor solution is a sulfur precursor solution containing sulfur, it is manufactured using the continuous mass synthesis method of quantum dots of the present invention. The quantum dots may be cadmium sulfide (CdS).

The synthesis method of quantum dots can be divided into a top-down method and a bottom-up method. First, the top-down method uses a physical method to fragment the bulk material down to nanometers to form three-dimensional particles into a lower-dimensional form. Structural instability and difficulties in realizing particles with a size of 10 nm or less exist, so it is difficult to implement quantum dots subjected to quantum confinement effects.

Therefore, recently, quantum dots have been synthesized using a bottom-up method for synthesizing quantum dots using chemical molecules or atoms as starting materials in a solution state. In order to improve the synthesis method, a method using a derived micro-platform is used (see FIG. 1 ).

However, the colloid synthesis method has a problem in that mixing does not occur uniformly and the reproducibility of optical properties of quantum dots made under the same conditions is low, and the method using the microplatform is difficult to see as a substantially continuous process and has a relatively small volume. It is not suitable for mass production by dealing with

The present invention was derived to overcome the above problem, and the precursor solution is continuously injected while controlling the injection rate, and the injection rate of the precursor solution is controlled by the Reynolds number in which turbulence is formed, or the injection rate of the precursor solution By controlling the Reynolds number by adjusting the size, it is characterized in that it is possible to continuously mass-synthesize small and uniform quantum dots at a high speed.

The continuous mass synthesis method of quantum dots of the present invention includes the step of continuously injecting the first precursor solution and the second precursor solution in directions facing each other at a constant injection rate to form quantum dots (step 2).

In an embodiment of the present invention, step 2 may be performed using a diaphragm pump.

The diaphragm pump is a type of pump that pumps up and discharges a liquid by a vertical motion of a pump membrane, and is generally used to continuously supply a fluid, and is usually used in a fuel pump of a gasoline engine.

In one embodiment of the present invention, the second step is performed using the diaphragm pump, thereby continuously supplementing and injecting the first precursor solution and the second precursor solution, thereby continuously producing quantum dots.

In this case, the second step may be performed by further using a damper to reduce pulsation when the precursor solution is injected using a diaphragm pump.

In an embodiment of the present invention, in step 2, the first precursor solution and the second precursor solution may be mixed while forming a turbulent flow and discharged at a constant discharge rate.

In this case, the Reynolds number (Re) at which the first precursor solution and the second precursor solution form turbulence may be expressed by Equation 1 below:

[Equation 1]

(In Equation 1 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first precursor solution and the second precursor solution,

υ is the exit rate of the first precursor solution and the second precursor solution,

W is the width of the outlet through which the first precursor solution and the second precursor solution are discharged.)

As used herein, the Reynolds number (Re) is the ratio of the "force by inertia" and the "viscous force" of a fluid in fluid mechanics, and the ratio of these two kinds of forces under a given flow condition. A number that quantitatively represents relative importance.

The Reynolds number is one of the most important dimensionless numbers in fluid dynamics, and is used together with other dimensionless numbers as a criterion for determining dynamic similitude. It is also used to predict whether a flow is laminar or turbulent, which is a flow dominated by viscous forces, has a low Reynolds number, and is characterized by a flat and constant flow. On the other hand, turbulent flow is a flow dominated by inertial force, has a high Reynolds number, and is characterized by random Eddy, vortex and other flow perturbations.

The turbulence refers to the flow of an irregular fluid, as opposed to the laminar flow, which is a regular flow, and includes vortices, jets, and the like.

In an embodiment of the present invention, the Reynolds number may be calculated using densities, viscosities, discharge rates, and widths of outlets of the first and second precursor solutions.

Specifically, the Reynolds number is the first precursor solution and the second precursor solution having the average density and average viscosity determined in step 1, and the width of the outlet through which the first precursor solution and the second precursor solution are discharged is fixed. Thus, it may be calculated by measuring the discharge rates of the first precursor solution and the second precursor solution, which are changed according to the injection rates of the first precursor solution and the second precursor solution injected in step 2 .

Accordingly, the Reynolds number may be controlled by adjusting the injection rates of the first precursor solution and the second precursor solution. In addition, the injection rates of the first precursor solution and the second precursor solution may be controlled through the Reynolds number.

In an embodiment of the present invention, the Reynolds number is a number that the first precursor solution and the second precursor solution collide to form a turbulence and mix, for example, 200 or more, for example, 200 to 100,000, for example For example, it may be 200 to 10,000, for example, 200 to 4,000, for example, 200 to 1,000. Regarding the upper limit of the Reynolds number, when the Reynolds number is 200 or more, turbulence is formed due to collision of the precursor solution, and the upper limit of the Reynolds number may be different depending on the flow rate limit of the diaphragm pump.

In conclusion, in the continuous mass synthesis method of quantum dots of the present invention, the flow rate is controlled using a diaphragm pump according to a specific Reynolds number at which turbulence is formed, and the continuously injected first and second precursor solutions collide with each other and mix Quantum dots are synthesized by self-assembly, and at the same time, the first precursor solution and the second precursor solution form a turbulent flow to be discharged at a constant discharge rate.

In the continuous mass synthesis method of quantum dots of the present invention, quantum dots are synthesized for a short time in which the precursor solution collides and mixes. Compared with the conventional synthesis method of quantum dots, it is possible to mass synthesize small and uniform quantum dots in a short time. There is an advantage that

In an embodiment of the present invention, step 2 may be performed using a synthesizer in which the inlets into which the first precursor solution and the second precursor solution are injected face each other in a limited space.

In this case, the synthesizing apparatus may include the diaphragm pump and the discharge tube through which the first precursor solution and the second precursor solution are discharged, and may be a continuous mass synthesizing apparatus of quantum dots according to the following aspect.

The continuous mass synthesizing apparatus of the quantum dots will be described in the following aspects.

In the step 2, when using a continuous mass synthesizing apparatus of quantum dots comprising the diaphragm pump and the discharge tube, the width of the outlet through which the first precursor solution and the second precursor solution, which are factors determining the Reynolds number, are discharged is It may be the diameter of the discharge tube, and the diameter of the discharge tube is fixed. A factor determining the Reynolds number forming turbulence is the discharge rate of the first precursor solution and the second precursor solution discharged through the discharge tube. can

In an embodiment of the present invention, when quantum dots are synthesized using the continuous mass synthesizing apparatus of quantum dots, the Reynolds number may be expressed by the following Equation 2:

[Equation 2]

(In Equation 2 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first precursor solution and the second precursor solution,

υ is the velocity in the outlet tubes of the first precursor solution and the second precursor solution,

D _H is the diameter of the discharge tube through which the first precursor solution and the second precursor solution are discharged,

Q is the total volumetric flow rate of the first precursor solution and the second precursor solution,

ν is the average kinematic viscosity of the first precursor solution and the second precursor solution,

A is the cross-sectional area of the discharge tube through which the first precursor solution and the second precursor solution are discharged.)

In an embodiment of the present invention, step 2 may be performed by controlling the synthesis rate of quantum dots by adjusting the Reynolds number.

As a specific example, when the Reynolds number is 200, when all 18.85 mg/mL of the precursor solution is exhausted by reaction, the quantum dots in one synthesizer are about 3 g/min 4 g/min, for example, 3.436 g/mL min, it can be produced at a rate of 1.8 tons per year.

In one embodiment of the present invention, the size of the synthesized quantum dots may be 1 nm to 10 nm, for example, 1 nm to 5 nm, for example, 2 nm to 3 nm.

In an embodiment of the present invention, step 2 may be performed by controlling the size of the synthesized quantum dots by adjusting the Reynolds number, and the size of the quantum dots formed according to a large Reynolds number is formed according to a relatively small Reynolds number. It may be smaller than the size of the quantum dot.

As a specific example, when the Reynolds number is 200, the size of the formed quantum dots may be 2.8 ± 0.2 nm, and when the Reynolds number is 300, the size of the formed quantum dots may be 2.7 ± 0.1 nm.

In an embodiment of the present invention, step 2 may be performed at room temperature.

The continuous mass synthesis method of quantum dots of the present invention can synthesize quantum dots without maintaining a separate temperature by synthesizing quantum dots using a room temperature synthesis method through rapid mixing in the conventional high temperature synthesis method, so there is no temperature treatment cost. It can be very advantageous in industries that use quantum dots.

One aspect of the present invention provides a continuous mass synthesizing apparatus of quantum dots.

In one embodiment of the present invention, the continuous mass synthesizing apparatus for quantum dots may be used for the continuous mass synthesizing method of quantum dots of the above-described aspect.

4 is a schematic diagram of a continuous mass synthesizing apparatus 1 for quantum dots of the present invention.

Specifically, Fig. 4a) is a schematic diagram of a continuous mass synthesizing apparatus 1 for quantum dots of the present invention, and Fig. 4b) is a cross-sectional view of part 10a shown in Fig. 4a).

Referring to Figure 4, the continuous mass synthesizing apparatus 1 of quantum dots of the present invention is a tube fitting part 10 in which quantum dots are synthesized by colliding and mixing the precursor solution continuously injected at a constant injection rate from both sides facing each other. and a pair of precursor solution supply units 100 and 200 positioned on both sides of the tube fitting unit 10 as a center; a pair of injection tubes 110 and 210 respectively connected to the pair of precursor solution supply units 100 and 200 to inject the precursor solution into the tube fitting unit 10; and a discharge tube 310 connected to the tube fitting portion 10 in a direction crossing the position where the pair of injection tubes 110 and 210 are connected to discharge the mixed solution inside the tube fitting portion 10; a separate control unit 400 for controlling the injection rate of the precursor solution flowing into the tube fitting unit 10 to form a turbulent flow determined by a specific Reynolds number; further includes

In one embodiment of the present invention, the tube fitting portion 10 is connected to the pair of injection tubes 110 and 210 facing each other, and the discharge tube 310 is connected to the pair of injection tubes 110 and 210 ) may be connected in a direction crossing the connected position, for example, in a T-shape.

In addition, the tube fitting part 10 is each inlet to which the pair of injection tubes 110 and 210 and the discharge tube 310 are connected, and the first precursor solution and the second precursor solution are injected at a constant flow rate. A place where quantum dots are formed by colliding and mixing, and may include an internal space.

In one embodiment of the present invention, the tube fitting portion 10 and the pair of injection tubes 110 and 210 and the discharge tube 310 are respectively an external fixing member (111a, 211a, 311a) or an internal fixing member ( 111b, 211b, 311b) can be used to connect and fix.

The tube fitting part 10 and the pair of injection tubes 110 and 210 and the discharge tube 310 using the external fixing members 111a, 211a, 311a or the internal fixing members 111b, 211b, 311b. When connecting and fixing the quantum dots, the precursor solution does not leak during the quantum dot synthesis process, and it can be safe from the toxic precursor solution. In addition, since it can be manufactured by assembling only the tube fitting part 10 and a pair of injection tubes 110 and 210 and the discharge tube 310, it can be manufactured more quickly and conveniently than the conventional apparatus.

In an embodiment of the present invention, the pair of precursor solution supply units 100 and 200 includes a first precursor solution supply unit 100 and a second precursor solution supply unit 200 , and the first precursor solution supply unit 100 . ) includes a first diaphragm pump 120 and a first precursor solution storage unit 140 , and the second precursor solution supply unit 200 includes a second diaphragm pump 220 and a second precursor solution storage unit 240 . includes

In addition, in an embodiment of the present invention, the pair of injection tubes 110 and 210 includes a first injection tube 110 and a second injection tube 210 .

In an embodiment of the present invention, in the first precursor solution supply unit 100 , the first precursor solution may be prepared in advance and loaded in the first precursor solution storage unit 140 . The first precursor solution carried in the first precursor solution storage unit 140 is continuously fed into the tube fitting unit 10 through the first injection tube 110 by the first diaphragm pump 120 at a constant flow rate. can be injected into

At the same time, in the second precursor solution supply unit 200 , a second precursor solution may be prepared in advance and loaded in the second precursor solution storage unit 240 . The second precursor solution carried in the second precursor solution storage unit 240 is continuously supplied at a constant flow rate into the tube fitting unit 10 through the second injection tube 210 by the second diaphragm pump 220 . can be injected into

At this time, the diaphragm pump may be connected to the control unit 400, and the control unit 400 uses the diaphragm pump to form a turbulent flow of the precursor solution injected into the tube fitting unit 10 by the Reynolds number. The injection rates of the first precursor solution and the second precursor solution may be controlled.

The diaphragm pump is a type of pump that pumps up and discharges a liquid by a vertical movement of a pump membrane, and may be used to continuously supply a fluid.

In an embodiment of the present invention, the first precursor solution supply unit 100 and the second precursor solution supply unit 200 may further include a first damper 130 and a second damper 230, respectively, and the diaphragm The pump operates while alternately sucking and discharging the fluid, and pulsation may occur. By further including, it is possible to continuously inject the reaction solution into the tube fitting part 10 at a constant flow rate by reducing the pulsation.

At this time, the first damper 130 and the second damper 230 may be connected to the controller 400 like the diaphragm pump, and the controller 400 controls the pulsation of the fluid supplied from the diaphragm pump. can

In an embodiment of the present invention, the Reynolds number may be expressed by the following Equation 2:

[Equation 2]

(In Equation 2 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first and second precursor solutions,

υ is the velocity in the outlet tubes of the first precursor solution and the second precursor solution,

D _H is the diameter of the discharge tube through which the first precursor solution and the second precursor solution are discharged,

Q is the total volumetric flow rate of the first precursor solution and the second precursor solution,

ν is the average kinematic viscosity of the first precursor solution and the second precursor solution,

A is the cross-sectional area of the discharge tube through which the first precursor solution and the second precursor solution are discharged.)

As used herein, the Reynolds number (Re) is the ratio of the "force by inertia" and the "viscous force" of a fluid in fluid mechanics, and the ratio of these two kinds of forces under a given flow condition. A number that quantitatively represents relative importance.

The Reynolds number is one of the most important dimensionless numbers in fluid dynamics, and is used together with other dimensionless numbers as a criterion for determining dynamic similitude. It is also used to predict whether a flow is laminar or turbulent, which is a flow dominated by viscous forces, has a low Reynolds number, and is characterized by a flat and constant flow. On the other hand, turbulent flow is a flow dominated by inertial force, has a high Reynolds number, and is characterized by random Eddy, vortex and other flow perturbations.

The turbulence refers to the flow of an irregular fluid, as opposed to the laminar flow, which is a regular flow, and includes vortices, jets, and the like.

In one embodiment of the present invention, in Equation 2, D _H may be the inner diameter of the discharge tube 310 in which the turbulent flow of the continuous mass synthesizing apparatus 1 of quantum dots of the present invention occurs.

In one embodiment of the present invention, the first precursor solution and the second precursor solution injected into the tube fitting part 10 collide with each other and mix to synthesize quantum dots, and a first precursor solution including the synthesized quantum dots; The second precursor solution is discharged to the outside through the discharge tube 310 . In this case, the quantum dots may grow by mixing due to turbulence of the mixed solution inside the mixed solution discharged to the outside through the discharge tube 310 .

Through the discharge through the discharge tube 310, a flow of fluid can be formed inside the quantum dot continuous mass synthesizing apparatus of the present invention, whereby the first precursor solution and the second in the tube fitting unit 10 are Through the turbulent flow due to the fluid collision of the precursor solution, the generation rate of quantum dots can be improved.

In addition, the simple tube fitting can be easily removed by flowing the washing solvent through the pump when the device is contaminated, and can be easily replaced if the tube is damaged.

In one embodiment of the present invention, the length of the discharge tube 310 may be 4 cm to 50 cm, for example, 7 cm to 30 cm, for example, 29 cm, and as described above, the discharge tube By moving the mixed solution through 310, quantum dots can grow. By adjusting the length of the discharge tube 310, it is possible to control the synthesis time of the quantum dots and the size of the quantum dots to be synthesized.

In one embodiment of the present invention, the inner diameter of the pair of inlet tubes 110, 210 and the outlet tube 310 is each 0.1 mm to 100 mm, for example, 0.1 mm to 50 mm, for example, 0.1 mm to 10 mm, for example 0.2 mm to 1 mm.

The continuous mass synthesizing apparatus of quantum dots of the present invention can increase the production rate of quantum dots by reacting a large volume of precursor solution by using a tube having a size of several to tens of mm.

In one embodiment of the present invention, the tube fitting portion 10, the pair of injection tubes (110, 210), and the discharge tube 310 may each include a fluorine-based polymer.

The fluorine-based polymer is a material that can use an organic solvent used for quantum dot synthesis, for example, Fluorinated ethylene propylene (FEP), Ethylene tetrafluoroethylene (ETFE), Polytetrafluoroethylene (PTFE), Polyvinylidene fluoride (PVDF), Polyvinylfluoride (PVF) , Polychlorotrifluoroethylene (PCTFE), Perfluoroalkoxy polymer (PFA), Ethylenechlorotrifluoroethylene (ECTFE), or Perfluoropolyether (PFPE) may be used, for example, PVDF or PTFE may be used, but is not limited thereto.

The continuous mass synthesizing apparatus 1 of quantum dots of the present invention uses a pair of injection tubes 110 and 210 and discharge tubes 310 and tube fittings 10 made of a fluorine-based polymer that can use an organic solvent. , it is possible to produce various types of quantum dots that are synthesized using various solvents.

The continuous mass synthesizing apparatus 1 of quantum dots according to an embodiment of the present invention includes the diaphragm pumps 120 and 220 and the dampers 130 and 230 controlled by the control unit 400, so that the tube fitting part 10 The Reynolds number may be controlled by adjusting the injection rates of the first precursor solution and the second precursor solution injected therein. In addition, the precursor solution can be continuously injected into the tube fitting part 10 by using the diaphragm pumps 120 and 220 and the dampers 130 and 230 .

In addition, the continuous mass synthesizing apparatus 1 of quantum dots of the present invention includes a T-shaped tube fitting 10 and an exhaust tube 310 including an internal space, a first precursor solution injected at a constant injection rate, and When the second precursor solution collides in the inner space of the tube fitting unit 10 to form a turbulent flow, and when the quantum dots are synthesized by mixing due to the turbulence, the first precursor solution and the second precursor solution containing the synthesized quantum dots By causing the mixed solution to form a turbulent flow and to be discharged to the outside through the discharge tube 310, it is possible to obtain a large amount of production, a small particle size, and uniform quantum dots.

The size of quantum dots synthesized using the continuous mass synthesizing apparatus 1 of quantum dots according to an embodiment of the present invention may be 1 nm to 5 nm, for example, 2 nm to 3 nm. In addition, the size of the quantum dot can also be controlled by the Reynolds number.

The continuous mass synthesis method of quantum dots of the present invention is performed at room temperature without a separate temperature treatment process using a continuous mass synthesis apparatus of quantum dots manufactured by a simple method of connecting a tube connected to a diaphragm pump using a connecting member. Compared to the synthesis method of quantum dots, it is simple and economical.

In addition, it is a simple process of controlling the injection rate of the precursor solution through the Reynolds number, overcoming the limitations of the conventional colloid synthesis method and the method using a micro platform, and shortening the reaction time to achieve uniform size and excellent optical properties. Since mass production is possible at a level suitable for continuous commercialization of quantum dots, it is possible to rapidly supply quantum dots to various fields using quantum dots.

Hereinafter, the present invention will be described in more detail by way of Examples. These examples are merely for illustrating the present invention in more detail, and it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited to these examples.

Example

Example 1. Continuous Bulk Synthesis of Quantum Dots

- Reagents

Cadmium chloride (99.99%, Sigma-Aldrich), sulfur (99.998% metals basis, Sigma-Aldrich), olyelamine (TECH, 70%, Sigma-Aldrich), toluene, ethanol, and hexane were used.

- Fabrication of continuous mass synthesis of quantum dots (imiging jet mixer)

5 is a component (a), a photograph (b), and a schematic diagram (c) of the continuous mass synthesizing apparatus 1 of quantum dots to be manufactured.

5, using the screw joints (111a, 211a, 311a, 111b, 211b, 311b) in the left and right and lower connections of the T-shaped tube fitting (ID = 0.65 mm, 10), respectively ID = 0.4 mm, The first injection tube 110, the second injection tube 210, and the discharge tube 310 of OD=0.6 mm are connected, and the first injection tube 110 and the second injection tube 210 each have a first The precursor solution and the second precursor solution are injected, and the first precursor solution and the second precursor solution collide in the discharge tube 310 to be mixed.

At this time, the diameters of the first injection tube 110 , the second injection tube 210 , and the discharge tube 310 were all the same, and PVDF and PTFE materials that can be used in various organic solvents were selected.

The first injection tube 110 and the second injection tube 210 are connected to the diaphragm pumps 120 and 220, respectively, and the first and second precursor solution storage units 140 and 240, respectively. The first precursor solution and the second precursor solution were continuously supplied to enable a continuous process, and dampers 130 and 230 were installed between each of the diaphragm pumps 120 and 220 and the left and right connections to prevent pulsation. It was reduced to have a constant flow rate.

- Visualization test and Reynolds number determination

A visualization test was performed to confirm a specific Reynolds number at which a turbulent flow occurs in the manufactured quantum dot continuous mass synthesizing device (impiging jet mixer).

Since the PVDF tube used for the actual synthesis is opaque and difficult to judge with the naked eye, a turbulent flow according to the color change through the acid-base reaction of NaOH and HCl was observed using a transparent urethane tube.

First, 0.1 N NaOH and 0.1 N HCl were prepared, and 0.1 wt% of phenolphthalein was added to NaOH and stirred. Since phenolphthalein is insoluble in water, 0.1 M NaOH was prepared with 66.7% of ethanol, 23.3% of distilled water, and 10% of 1 M sodium hydroxide.

In order to match the density of the two fluids, the same volume ratio was used for HCl. The flow rate was controlled using a diaphragm pump and damper.

The Reynolds equation used is as shown in Equation 2 below:

[Equation 2]

(In Equation 2 above,

ρ is the average density of the first and second precursor solutions,

μ is the average viscosity of the first precursor solution and the second precursor solution,

υ is the velocity in the outlet tubes of the first precursor solution and the second precursor solution,

D _H is the diameter of the discharge tube through which the first precursor solution and the second precursor solution are discharged,

Q is the total volume flow rate of the first precursor solution and the second precursor solution,

ν is the average kinematic viscosity of the first precursor solution and the second precursor solution,

A is the cross-sectional area of the discharge tube through which the first precursor solution and the second precursor solution are discharged.)

Since the kinematic viscosity (ν) is an ethanol-distilled water mixed solution, the boiling point table was referred to, and the laminar flow and turbulent flow were captured as images by photographing on the fabricated device and shown in FIG. 6 .

Referring to FIG. 6 , when the Reynolds number is 50 (a in FIG. 6), mixing does not occur and it can be confirmed that only purple appears as a single flow, and when the Reynolds number is 200 (b in FIG. 6), mixing occurs and a part It was confirmed that it appeared colorless.

Therefore, it was confirmed that a turbulence behavior suitable for synthesizing quantum dots by flash nano-precipitation was shown at a Reynolds number of 200 or more, and the Reynolds number was determined as 200 (Example 1-1) and 300 (Example 1-2).

- Preparation of precursor solution

Cadmium chloride and sulfur were respectively dissolved in olyelamine so that the ratio was 1: 6, Cadmium chloride was dissolved in a tree-neck flask by heating at 175 ° C under nitrogen flow for 20 to 30 minutes, and Sulfur was dissolved in the solute at room temperature. The mixture was stirred until Cd precursor solution and S precursor solution were prepared.

- CdS quantum dot synthesis

Each of the prepared precursor solutions was divided into a 100 mL Erlenmeyer flask serving as a precursor solution storage unit, and was connected to each diaphragm pump.

The CdS quantum dot precursor solution was mixed while controlling the flow rate of the diaphragm pump according to the Reynolds number. CdS synthesis was carried out in sequence with Reynolds numbers of 200 (Example 1-1) and 300 (Example 1-2), and the reactant was received about 3 mL in a 50 mL conical tube containing a large amount of toluene and immediately CdS quantum dots stopped the growth of In addition, ethanol was added and centrifuged at 8,000 RPM, and CdS quantum dots were redispersed in hexane.

Comparative Example 1. Synthesis of quantum dots

- Reagents

Cadmium chloride (99.99%, Sigma-Aldrich), sulfur (99.998% metals basis, Sigma-Aldrich), olyelamine (TECH, 70%, Sigma-Aldrich), toluene, ethanol, and hexane were used.

- Preparation of precursor solution

6 mmol of sulfur was added to 5 mL of olyelamine, dissolved in a 20 mL vial using a magnetic stirrer, 1 mmol of Cadmium chloride was added to 10 mL of olyelamine, and stirred in a tree-neck flask. Then, it was heated to 175° C. under a nitrogen flow and dissolved for 20 to 30 minutes to prepare a Cd precursor solution and an S precursor solution.

- Synthesis of CdS quantum dots

The S precursor (sulfur-oleylamine) solution was slowly injected into the tree-neck flask containing the Cd precursor (Cadmium-oleylamine) solution. It was heated to 175° C. under a flow of nitrogen and stirred for 3 hours. After the synthesis was completed, 1 mL of the reactant solution was aliquoted at room temperature and put into a large amount of toluene to stop the size growth of CdS particles. Additional ethanol was added and centrifuged at 8,000 RPM. The separated CdS quantum dots were redispersed in hexane.

Experimental Example 1. TEM analysis

The concentration of the sample was proceeded to 0.5 wt%. CdS quantum dots synthesized in Example 1-1, Example 1-2, and Comparative Example 1 were placed on a TEM grid by aliquoting 0.2 μL without separate staining. The TEM grid used Lacey Carbon on 300 mesh Cu (TED PELLA).

The size was analyzed in the TEM image using the J image program, and is shown in FIG. 7 .

Referring to FIG. 7 , the CdS quantum dots synthesized in Comparative Example 1, Example 1-1 and Example 1-2 were 8.9 ± 1.4 nm (batch process), 2.8 ± 0.2 nm (Re=200), 2.7 ± 0.1, respectively. nm (Re=300).

Comparing the batch process of Comparative Example 1 and the continuous process of Example 1, it can be seen that there is a difference of about 3 times or more in the size of the synthesized quantum dots, and it can be confirmed that this difference is due to the different mixing times. In the batch process of Comparative Example 1, the particle size is large by applying a long reaction for 3 hours, but in the continuous process of Example 1, it can be seen that small quantum dots can be synthesized by rapid mixing for a short time using turbulent flow. there was.

In addition, when checking the shape of the quantum dot particles formed by the batch process of Comparative Example 1, there are many elongated oval particles in addition to the spherical particles, whereas the shape of the quantum dot particles formed by the continuous process of Example 1 is mostly spherical. there was.

Therefore, it was confirmed that the continuous process of Example 1 synthesized particles having a relatively small size and uniform spherical shape compared to the batch process of Comparative Example 1.

Experimental Example 2. XRD analysis

CdS quantum dots centrifuged on the edge of the conical tube synthesized in Example 1-1 and Comparative Example 1 were placed on parchment paper and transferred to a Petri dish. The lid of the Petri dish was slightly closed and dried at a temperature of 70 ℃ to 80 ℃ for more than 24 hours, and an ASC Glass ample holder (ø18×0.5mm) was used.

FIG. 8 a) shows a reference peak of the XRD diffraction pattern of CdS. Specifically, in a) of FIG. 8, a-1 denotes quasi-spherical CdS NCs, a-2 denotes a mixture of CdS nanorods, bipods and tripods, a-3 denotes CdS tetrapods, and a-4 denotes XRD of CdS nano-candy corn. The diffraction pattern is shown. CdS particles have two crystalline forms: a stable hexagonal wurtzite and a cubic zinc blende structure.

FIG. 8 b) is an XRD peak of CdS quantum dots synthesized through the processes of Example 1-1 and Comparative Example 1. FIG.

8, the peaks shown in the batch process of Comparative Example 1 and the continuous process of Example 1-1 are 25°, 26.6°, 28°, 43.9°, 48°, 52°, and compared with the reference peak, all It was confirmed that the peaks coincide, and it was confirmed that the synthesis of CdS quantum dots was properly performed.

However, in the CdS quantum dots synthesized in the continuous process of Example 1-1, it was confirmed that the peaks at 25° and 28° were combined into one peak, which could be expected to be related to the size of the particles. As the diameter of the particle decreases, staking faults occur in the crystal structure and merge into one peak or the intensity of the peak may be weakened, and since the size of the quantum dots synthesized by the continuous process of Example 1-1 is remarkably small, one peak could be considered to be combined with

Experimental Example 3. UV-visible Absorption and Photoluminescence Analysis

- UV-visible absorption analysis

The concentration of the sample was proceeded to 0.5w%. Cuvette measures the UV-visible absorption spectrum of CdS quantum dots synthesized in Comparative Example 1, Example 1-1 and Example 1-2 using a product with a PTFE stopper in 3.5ml of Macro quartz, and the results are shown in FIG. It is shown in a).

The first absorption wavelength of UV-visible of CdS quantum dots occurs in the vicinity of 350 nm to 500 nm, and as the diameter of the quantum dots decreases, the absorption wavelength tends to shift to the left. The peak that continues in a straight line near 0 and rises gently was judged to be the first absorption wavelength.

Referring to FIG. 9 a), the absorption wavelength of the CdS quantum dots synthesized by the method of Comparative Example 1 occurred around 470 nm, and the CdS quantum dots synthesized by the method of Examples 1-1 and 1-2 were 365 nm was found to be absorbed from

As the size of the particles decreases, a blue shift phenomenon occurs, so that the size of the CdS quantum dots synthesized by the method of Examples 1-1 and 1-2 is significantly higher than the particle size of the CdS quantum dots synthesized by the method of Comparative Example 1. could be expected to be small.

- Photoluminescence analysis

The optical characteristics of the CdS quantum dots are determined through the emission intensity, and the emission intensity graph (b) and photoluminescence of the CdS quantum dots synthesized by the method of Comparative Example 1 and Examples 1-1 and 1-2 are shown in FIG. ) Picture (c) is shown.

Referring to FIG. 9 b), when the light emission intensity is compared on the same scale, it can be seen that the intensity of the quantum dots synthesized by the batch process of Comparative Example 1 is remarkably low.

This could be confirmed even when irradiated with UV-light. Referring to FIG. 9 c), in the quantum dots synthesized by the continuous process of Example 1-1, a change in color can be observed conspicuously even in a bright space, In the quantum dots synthesized by the batch process of Comparative Example 1, it was found that they were not visually confirmed even when illuminated in a dark space.

The reason for such a difference in the emission intensity of the quantum dots synthesized by the synthesis method of Comparative Example 1 and Example 1-1 is because of the quantum confinement effect. could be judged to be weak.

As a result, it was found that the optical properties of the CdS quantum dots synthesized by the continuous mass synthesis method of the quantum dots of the present invention were better.

So far, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1: Quantum dot continuous mass synthesizing device
10: tube fitting part
100: first precursor solution supply unit
110: first infusion tube
111a: first external fixing member
111b: first internal fixing member
120: first diaphragm pump
130: first damper
200: second precursor solution supply unit
210: second infusion tube
211a: second external fixing member
211b: second internal fixing member
220: second diaphragm pump
230: second damper
310: drain tube
311a: third external fixing member
311b: third internal fixing member
400: control unit

Claims (18)

preparing a first precursor solution and a second precursor solution (step 1); and
and continuously injecting the first precursor solution and the second precursor solution in directions facing each other at a constant injection rate to form quantum dots (step 2);
In step 2, the first precursor solution and the second precursor solution are mixed to form a turbulent flow and discharged at a constant discharge rate,
A continuous mass synthesis method of quantum dots, characterized in that the first precursor solution and the second precursor solution form a turbulence, Reynolds number (Re) is 200 to 100,000, and is expressed by Equation 1 below:
[Equation 1]

(In Equation 1 above,
ρ is the average density of the first and second precursor solutions,
μ is the average viscosity of the first precursor solution and the second precursor solution,
υ is the exit rate of the first precursor solution and the second precursor solution,
W is the width of the outlet through which the first precursor solution and the second precursor solution are discharged.) The method of claim 1,
Step 2 is a continuous mass synthesis method of quantum dots, characterized in that performed using a diaphragm pump. 3. The method of claim 2,
The Reynolds number is a continuous mass synthesis method of quantum dots, characterized in that controlled by a constant injection rate of each of the first precursor solution and the second precursor solution, which are controlled by controlling the flow rate of the diaphragm pump. 3. The method of claim 2,
Step 2 is a continuous mass synthesis method of quantum dots, characterized in that it is performed by controlling the pulsation of the diaphragm pump using a damper. The method of claim 1,
The step 2 is a continuous mass synthesis method of quantum dots, characterized in that carried out at room temperature. The method of claim 1,
In step 1,
The first precursor solution and the second precursor solution are cadmium (Cd), zinc (Zn), mercury (Hg), indium (In), gallium (Ga), selenium (Se), sulfur (S), and Te), lead (Pb), phosphorus (P), and arsenic (As), characterized in that it contains any one or more selected from the group consisting of a continuous mass synthesis method of quantum dots. The method of claim 1,
The quantum dots synthesized in step 2 are cadmium selenide (CdSe), cadmium sulfide (CdS), cadmium telleride (CdTe), zinc selenide (ZnSe), zinc telleride (ZnTe), zinc sulfide (ZnS), mercury tele Ride (HgTe), indium arsenide (InAs), indium phosphorus (InP) and gallium arsenide (GaAs), characterized in that any one of the continuous synthesis method of quantum dots. The method of claim 1,
A continuous mass synthesis method of quantum dots, characterized in that controlling the synthesis rate of quantum dots by controlling the Reynolds number. The method of claim 1,
A continuous mass synthesis method of quantum dots, characterized in that controlling the size of the synthesized quantum dots by controlling the Reynolds number. The method of claim 1,
The size of the quantum dots to be synthesized is a continuous mass synthesis method of quantum dots, characterized in that 1 nm to 10 nm. A quantum dot having a size of 1 nm to 10 nm synthesized by the synthesis method of claim 1. a tube fitting part in which quantum dots are synthesized by colliding and mixing a precursor solution continuously injected at a constant injection rate from both sides facing each other, and a pair of precursor solution supply parts located on both sides of the tube fitting part;
a pair of injection tubes respectively connected to the pair of precursor solution supply parts to inject the precursor solution into the tube fitting part; and
A discharge tube connected to the tube fitting part in a direction intersecting with a position where the pair of injection tubes are connected to discharge the mixed precursor solution inside the tube fitting part; including,
A continuous mass synthesizing apparatus for quantum dots, characterized in that by controlling the injection rate of the precursor solution flowing into the tube fitting part by a separate control unit, a turbulence determined by a specific Reynolds number is formed. 13. The method of claim 12,
The pair of precursor solution supply units includes a first precursor solution supply unit and a second precursor solution supply unit,
The pair of injection tubes is a continuous mass synthesizing apparatus of quantum dots, characterized in that it comprises a first injection tube and a second injection tube. 14. The method of claim 13,
The first precursor solution supply unit and the second precursor solution supply unit continuous mass synthesizing apparatus of quantum dots, characterized in that it comprises a first diaphragm pump and a second diaphragm pump, respectively. 14. The method of claim 13,
Quantum dot continuous mass synthesizing apparatus, characterized in that the first precursor solution supply unit and the second precursor solution supply unit further include a first damper and a second damper, respectively. 13. The method of claim 12,
Quantum dot continuous mass synthesizing apparatus, characterized in that each of the pair of injection tube and discharge tube has an inner diameter of 0.1 mm to 100 mm. 13. The method of claim 12,
The tube fitting part, the pair of injection tube and the discharge tube is a quantum dot continuous mass synthesizing apparatus, characterized in that each contains a fluorine-based polymer. 13. The method of claim 12,
A continuous mass synthesizing apparatus for quantum dots, characterized in that for synthesizing quantum dots with a size of 1 nm to 10 nm.

Images