KR101640429B1 - Manufacturing method of alloy-shell quantum dot, alloy-shell quantum dot and backlight unit including same - Google Patents

Abstract

Adding a compound precursor of Group 12 elements, an organic solvent and an unsaturated fatty acid to a first reaction bath to obtain and heating a first mixed solution; Adding a Group 16 element compound to a first surfactant in liquid form to obtain a second mixed solution; Adding a second mixed solution to the heated first mixed solution; Synthesizing and separating alloy quantum dots after the addition and purification; Adding a compound precursor of Group 12 element, an organic solvent and an unsaturated fatty acid to a second reaction tank to obtain and heating a third mixed solution; Adding a compound precursor of a Group 16 element to a second surfactant in liquid form to obtain a fourth mixed solution; Adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution; Shell quantum dots and synthesizing and separating alloy-shell quantum dots after the addition and purification, and a backlight unit including the alloy-shell quantum dots and the alloy-shell quantum dots produced according to the method.

Description

TECHNICAL FIELD [0001] The present invention relates to an alloy-shell quantum dot manufacturing method, an alloy-shell quantum dot manufacturing method, and a backlight unit including the same. BACKGROUND ART [0002]

The present invention relates to an alloy-shell quantum dot manufacturing method, an alloy-shell quantum dot, and a backlight unit including the same.

The quantum dot (QD) is a nano-sized semiconductor material. The quantum dot (QD) exhibits the characteristic of increasing the energy density due to the quantum confinement effect that the band gap becomes larger as the size becomes smaller. Therefore, it is possible to have a bandgap corresponding to visible light, and in the case of a quantum dot having a direct band gap, the light emitting efficiency can be further improved.

As a typical application example using the advantages of the quantum dot which can freely control the wavelength in the visible light region and has excellent light stability, light-emitting diodes (LEDs) can be exemplified. In addition to general illumination, There is a great demand for industrial.

According to the prior art, the quantum dots are characterized in that their wavelengths are adjusted according to their sizes, and their size increases from a short wavelength to a long wavelength. When two or more quantum dots are mixed, the quantum efficiency decreases due to the different sizes of the respective quantum dots, It is difficult to match the density, and the color reproducibility is deteriorated. In addition, it is very difficult to produce uniform quantum dots of the respective quantum dots uniformly in accordance with the method of synthesis for each wavelength band.

Therefore, efforts have been made to manufacture quantum dots having a uniform size at different wavelengths and at the same time having excellent quantum efficiency.

In one embodiment, there is provided an alloy-shell quantum dot manufacturing method having uniform sizes at different wavelengths.

In another embodiment, there is provided an alloy-shell quantum dot produced according to the alloy-shell quantum dot manufacturing method.

In another embodiment, there is provided a backlight unit comprising the alloy-shell quantum dot.

One embodiment provides a method for producing an alloy-shell quantum dot comprising: adding a compound precursor of Group 12 elements, an organic solvent and an unsaturated fatty acid to a first reactor to obtain and heating a first mixed solution; Adding a Group 16 element compound to a first surfactant in liquid form to obtain a second mixed solution; Adding a second mixed solution to the heated first mixed solution; Synthesizing and separating alloy quantum dots after the addition and purification; Adding a compound precursor of Group 12 element, an organic solvent and an unsaturated fatty acid to a second reaction tank to obtain and heating a third mixed solution; Adding a compound precursor of a Group 16 element to a second surfactant in liquid form to obtain a fourth mixed solution; Adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution; And after the addition and purification, synthesizing and separating alloy-shell quantum dots.

The second surfactant may include at least one member selected from the group consisting of octylamine, dioctylamine, trioctylamine, hexadecylamine, octahexadecylamine and dodecylamine.

The first surfactant may be selected from the group consisting of trioctylphosphine oxide, tributylphosphine, triisopropylphosphine, triphenylphosphine oxide, tricyclohexylphosphine, Phosphine, and phosphine.

The unsaturated fatty acids may be selected from the group consisting of lauric acid, palmitic acid, oleic acid, stearic acid, myristic acid, elaidic acid, The organic acid may be selected from the group consisting of eicosanoic acid, heneicosanoic acid, tricosanoic acid, docosanoic acid, tetracosanoic acid, hexacosanoic acid, And may include at least one member selected from the group consisting of heptacosanoic acid, octacosanoic acid, and cis-13-docosenoic acid.

The compound precursor of the Group 12 element is selected from the group consisting of zinc iodide, zinc bromide, zinc chloride, zinc fluoride, zinc acetate, zinc acetylacetonate, zinc carbonate, zinc cyanide, zinc nitrate, zinc oxide, zinc peroxide, Cadmium bromide, cadmium bromide, cadmium chloride, cadmium fluoride, cadmium carbonate, cadmium nitrate, dimethylcadmium, diethylcadmium, cadmium acetate, cadmium acetylacetonate, cadmium iodide, cadmium oxide, cadmium perchlorate, Cadmium phosphide, and cadmium sulfate.

The Group 16 element compound may be sulfur, selenium or tellurium.

The compound precursor of the Group 16 element is selected from the group consisting of hexane thiol, octane thiol, decane thiol, dodecane thiol, hexadecane thiol, sulfur-trioctylphosphine, sulfur-tributylphosphine, Amine, trimethylsilyl sulfur, ammonium sulfide, sodium sulfide, selenium-trioctylphosphine, selenium-tributylphosphine, and selenium-triphenylphosphine.

The organic solvent may be selected from the group consisting of 1-octadecene, 1-nonadecene, cis-2-methyl-7-octadecene, 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-undecene, 1-dodecene, 1-decene, and combinations thereof.

In the step of adding the alloy quantum dots and the fourth mixed solution to the heated third mixed solution, 100 to 500 mg of the alloy quantum dots may be added.

In the step of heating and heating the first mixed solution and the step of heating and then heating the third mixed solution, the heating may be heated to 200 ° C to 350 ° C.

In the step of adding the second mixed solution to the heated first mixed solution, the addition of the second mixed solution may be performed in the range of 0.1 second to 5 seconds.

In the step of adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution, the addition of the fourth mixed solution may be performed in a range of 10 minutes to 60 minutes.

Another embodiment provides an alloy-shell quantum dot fabricated according to this embodiment.

The alloy quantum dot (alloy-shell quantum dot) having a shell on the surface may have an average particle diameter in the visible light wavelength region of 3 nm to 10 nm.

The visible light wavelength region may be from 440 nm to 640 nm.

The alloy-shell quantum dot may have a half-width (FWHM) of 35 nm or less.

Yet another embodiment provides a backlight unit comprising the quantum dot.

According to this embodiment, an alloy-shell quantum dot having a uniform size can be synthesized by controlling kinds and amounts of reactants such as a surfactant.

In addition, the alloy-shell quantum dots are more uniformly arranged than the conventional alloy quantum dots, and thus have excellent color reproducibility and high quantum efficiency. Thus, the alloy-shell quantum dots can be used for a backlight unit, a liquid crystal display device, a lighting device, a solar cell, Applicable to the field.

FIGS. 1 and 2 are graphs showing PL peaks in different wavelength regions of an alloy-shell quantum dot prepared according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In one embodiment, a compound precursor of Group 12 elements, an organic solvent and an unsaturated fatty acid are added to a first reaction vessel to obtain and heat a first mixed solution; Adding a Group 16 element compound to a first surfactant in liquid form to obtain a second mixed solution; Adding a second mixed solution to the heated first mixed solution; Synthesizing and separating alloy quantum dots after the addition and purification; Adding a compound precursor of Group 12 element, an organic solvent and an unsaturated fatty acid to a second reaction tank to obtain and heating a third mixed solution; Adding a compound precursor of a Group 16 element to a second surfactant in liquid form to obtain a fourth mixed solution; Adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution; And a step of synthesizing and separating alloy-shell quantum dots after the addition and refining to prepare an alloy-shell quantum dots.

According to the above production method, alloy-shell quantum dots can be produced by a simple and stable method in which a second surfactant different from the first surfactant is added, and also alloy-cell quantum dots are prepared using a two-pot Lattice mismatch can be minimized and an alloy-shell quantum dot which is stable to oxygen and moisture penetration and is highly efficient can be manufactured by forming a thick shell.

The second surfactant is a compound capable of coordinate bond and may be an amine compound. For example, the second surfactant may be selected from the group consisting of decylamine, didecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, octadecylamine, But are not limited to, octadecylamine, undecylamine, dioctadecylamine, N, N-dimethyldecylamine, N, N-dimethyldodecylamine ), N, N-dimethylhexadecylamine, N, N-dimethyltetradecylamine, N, N-dimethyltridecylamine, But are not limited to, N, N-dimethylundecylamine, octahexadecylamine, N-methyloctadecylamine, dodecylamine, didodecylamine, Tridodecylamine, cyclododecylamine, N-methyldodecylamine, and the like. but is not limited to, one or more selected from the group consisting of ne, octylamine, dioctylamine, and trioctylamine. By using an amine compound as the second surfactant, the alloy quantum dots can be surface-treated without loss of quantum efficiency. For example, the second surfactant may be selected from the group consisting of octylamine, dioctylamine, trioctylamine, hexadecylamine, octadecylamine, and dodecylamine. One or more selected from the group consisting of < RTI ID = 0.0 >

The first surfactant is selected from the group consisting of trioctylphosphine oxide, tributylphosphine, triisopropylphosphine, triphenylphosphine oxide, tricyclohexylphosphine, And trioctylphosphine. However, the present invention is not limited thereto.

The first surfactant and the second surfactant may be used interchangeably. That is, the second surfactant may be added to the first reaction tank, and the first surfactant may be added to the second reaction tank.

The unsaturated fatty acid allows the compound precursor of the group 12 element and the compound precursor of the group 16 element to be uniformly dispersed in the organic solvent. The unsaturated fatty acids include, for example, lauric acid, palmitic acid, oleic acid, stearic acid, myristic acid, elaidic acid, (Eicosanoic acid), heneicosanoic acid, tricosanoic acid, docosanoic acid, tetracosanoic acid, hexacosanoic acid, heptanoic acid, But are not limited to, one or more selected from the group consisting of heptacosanoic acid, octacosanoic acid, and cis-13-docosenoic acid.

The compound precursor of the Group 12 element is a compound containing zinc or cadmium and includes, for example, zinc iodide, zinc bromide, zinc chloride, zinc fluoride, zinc acetate, zinc acetylacetonate, zinc carbonate, zinc cyanide, A cadmium salt, a cadmium chloride, a cadmium chloride, a cadmium chloride, a cadmium carbonate, a cadmium nitrate, a dimethylcadmium, a diethylcadmium, a cadmium acetate, a cadmium acetylacetonate, a cadmium bromide, a cadmium bromide, But is not limited to, at least one selected from the group consisting of iodide, cadmium oxide, cadmium perchlorate, cadmium phosphide, and cadmium sulfate. For example, the compound precursor of the Group 12 element may include at least one member selected from the group consisting of cadmium oxide, cadmium acetate, zinc oxide, and zinc acetate.

For example, the precursor of the Group 12 element may include mercury in addition to zinc and cadmium. For example, the compound precursor of the Group 12 elements, including mercury, and the like, can be selected from the group consisting of mercury fluoride, mercury cyanide, mercury nitrate, mercury acetate, mercury iodide, mercury bromide, mercury chloride, mercury oxide, mercury perchlorate, Sulfate, and the like, but is not limited thereto.

Instead of the compound precursor of the Group 12 element, a compound precursor of Group 14 element such as a lead precursor may be used. The lead-containing compound precursor may be, but is not limited to, lead acetate, lead bromide, lead chloride, lead fluoride, lead oxide, lead chlorchlorate, lead nitrate, lead sulfate or lead carbonate .

The Group 16 element compound may be, but is not limited to, sulfur, selenium or tellurium. The Group 16 element compound added to the first surfactant may be in powder form.

The compound precursor of the Group 16 element is a compound containing sulfur or selenium, and examples thereof include hexane thiol, octane thiol, decane thiol, dodecane thiol, hexadecane thiol, sulfur-trioctylphosphine, At least one member selected from the group consisting of triphenylphosphine, sulfur-trioctylamine, trimethylsilyl sulfur, ammonium sulfide, sodium sulfide, selenium-trioctylphosphine, selenium-tributylphosphine and selenium- But is not limited thereto. For example, the compound precursor of the Group 16 element may be in powder or liquid form. The compound precursor of the Group 16 element added to the second surfactant may be in powder or liquid form.

For example, the compound precursor of the Group 16 element may include tellurium in addition to sulfur, selenium, and the like. For example, the compound precursor of the group 16 element including tellurium and the like can be, for example, tellurium-trioctylphosphine, tellurium-tributylphosphine, tellurium-triphenylphosphine, and the like, but is not limited thereto.

The organic solvent may be 1-octadecene, 1-nonadecene, cis-2-methyl-7-octadecene, 1- 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, But is not limited to, one or more selected from the group consisting of 1-undecene, 1-dodecene, 1-decene, and combinations thereof. For example, the organic solvent may be 1-octadecene.

In the step of heating and heating the first mixed solution and the step of heating and then heating the third mixed solution, the heating may be heated to 200 ° C to 350 ° C. When the second mixed solution and the fourth mixed solution are added after heating to a temperature of less than 200 ° C, the precursors of the core and shell components do not participate in the reaction and the reactivity is significantly lowered. After heating to a temperature higher than 350 ° C 2 mixed solution and the fourth mixed solution are added, the precursors of the core and shell components are burned at a high temperature and the quantum dots are synthesized, and the efficiency of the quantum dots is greatly lowered.

In the step of adding the second mixed solution to the heated first mixed solution, the second mixed solution may be added within a short time, for example, 0.1 second to 5 seconds, for example, 0.5 second to 2 seconds. The Group 2 element compound precursor, the Group 16 element compound, and the first surfactant may be uniformly mixed if the second mixed solution is added to the first mixed solution within a short period of time.

Also, the second mixed solution may be added to the first mixed solution in a mist form. For this purpose, the second mixed solution may be added to the first mixed solution through an inlet having a plurality of fine holes at the ends thereof.

In the step of adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution, the third mixed solution is added to the fourth mixed solution For example, 10 minutes to 60 minutes. Therefore, the fourth mixed solution may be added dropwise to the third mixed solution. By slowly adding the fourth mixed solution into the third mixed solution, the shell can be thickly deposited on the quantum dot core without being affected by the reaction temperature.

In the step of adding the alloy quantum dots and the fourth mixed solution to the heated third mixed solution, the alloy quantum dots may be added in an amount of 100 mg to 500 mg, for example, 100 mg to 300 mg. By adding the alloy quantum dots in the above range, a shell that is neither too thin nor too thick can be stacked on the quantum dot core to obtain high-efficiency alloy-shell quantum dots.

In another embodiment, there is provided an alloy-shell quantum dot fabricated according to this embodiment.

The alloy-shell quantum dot is a quantum dot having a uniform size that emits light of different wavelengths, and is superior in color reproducibility, stability, and quantum efficiency as compared with the conventional alloy quantum dot.

The alloy-shell quantum dots have an average particle size of 3 nm in the wavelength range of visible light wavelength, for example, 440 nm to 640 nm, such as 500 nm to 640 nm, for example, in the wavelength range of 500 nm to 550 nm, To 10 nm, such as 7 nm to 9 nm. Since the alloy-shell quantum dots have an average particle diameter in the above-mentioned range in the wavelength region, the quantum efficiency increases, the lattice mismatch decreases, and it is stable to penetration of oxygen and moisture.

The alloy-shell quantum dot may have a full width at half maximum (FWHM) of 35 nm or less.

In another embodiment, there is provided a backlight unit comprising an alloy-shell quantum dot according to this embodiment.

The backlight unit may be a backlight unit for a light emitting diode (LED).

The alloy-shell quantum dot according to this embodiment can be applied to a liquid crystal display (LCD), a lighting device, a solar cell, a biosensor, etc., in addition to a backlight unit for a light emitting diode (LED) But is not limited thereto.

Hereinafter, the embodiments will be described with reference to embodiments. However, these embodiments are only intended to illustrate or explain the embodiments, and the present invention is not limited thereto.

( Example )

Example  One

(1) Alloy Quantum dot synthesis

0.4 mmol of cadmium oxide powder, 4 mmol of zinc acetate powder, 6 ml of oleic acid and 15 ml of 1-octadecine are placed in a reaction flask and maintained at 150 ° C for 2 hours in a vacuum state. Subsequently, nitrogen gas was introduced to replace the atmosphere with no oxygen, and the temperature was raised to 300 ° C. Separately, 0.3 mmol of selenium powder and 3.5 mmol of sulfur powder are dissolved in 2 ml of trioctylphosphine to form a TOPSeS precursor.

When the temperature reaches 300 캜, the TOPSeS precursor is placed in an injection syringe and rapidly injected into the reaction flask. At this time, the end portion of the injection syringe needle is provided with one or more porous holes.

After the rapid injection of the TOPSeS, the mixture is allowed to stand for 5 minutes to 10 minutes. When the temperature is lowered to 50 to 60 ° C, purification is carried out using acetone three times or more.

Thereafter, the solvent is completely dried to obtain a powder (alloy quantum dot) as a purified product, and then redispersed in a solvent such as toluene, chloroform, nucleic acid or the like.

(2) Alloy-shell quantum dot synthesis

0.1 mmol of cadmium acetate powder, 0.5 mmol of zinc oxide powder, 1.5 mmol of oleic acid and 25 ml of 1-octadecene are placed in a reaction flask and heated at 120 캜 for 1 hour while maintaining a vacuum. After injecting the nitrogen gas and raises the temperature in N ₂ atmosphere to 300 ℃. Separately, 1.6 mmol of octanethiol is added to 2 ml of trioctylamine to make an S precursor.

When the temperature reaches 300 캜, 200 mg of the above-described alloy quantum dot is placed in the reaction flask, and then the S precursor is slowly dropped into the reaction flask in the dropwise manner, followed by allowing to stand for about 30 minutes.

When the temperature falls to 50 ° C to 60 ° C, the purification is carried out three times or more using acetone.

Thereafter, the solvent is completely dried to obtain a powder (alloy-shell quantum dot) as a purified product, and then redispersed in a solvent such as toluene, chloroform, or nucleic acid.

The alloy-shell quantum dots are represented by the chemical formula of CdZnSeS-CdZnS, and the average particle diameter in a wavelength range of 510 nm to 540 nm was 7 nm to 9 nm, and the half width (FWHM) was 35 nm or less.

(evaluation)

Quantum efficiency evaluation

( Green  Quantum efficiency in the region)

The PL peaks of alloy-shell quantum dots and alloy quantum dots synthesized in Example 1 in the wavelength range of 510 nm to 540 nm were measured and shown in FIG.

(Internal) quantum efficiency (excitation wavelength: 450 nm) of alloy-shell quantum dots and alloy quantum dots synthesized in Example 1 were measured 10 times each using QE-2100 (Otsuka Electronics Co., Ltd.) The results are shown in Table 1 below.

No. (Internal) quantum efficiency Alloy quantum dot Alloy - Shell Quantum Dots One 0.743 0.942 2 0.740 0.929 3 0.773 0.924 4 0.748 0.924 5 0.750 0.907 6 0.737 0.905 7 0.723 0.923 8 0.731 0.928 9 0.734 0.917 10 0.729 0.922 Average 0.741 0.922

From FIG. 1 and Table 1, it can be seen that the alloy-shell quantum dot produced by the manufacturing method according to one embodiment has a quantum efficiency of about 10% to 30% higher than the alloy quantum dot.

( Red  Quantum efficiency in the region)

The PL peaks of alloy-shell quantum dots and alloy quantum dots synthesized in Example 1 in the wavelength range of 600 nm to 640 nm were measured and shown in FIG.

(Internal) quantum efficiency (excitation wavelength: 450 nm) of alloy-shell quantum dots and alloy quantum dots synthesized in Example 1 were measured 10 times each using QE-2100 (Otsuka Electronics Co., Ltd.) The results are shown in Table 2 below.

No. (Internal) quantum efficiency Alloy quantum dot Alloy - Shell Quantum Dots One 0.795 0.903 2 0.795 0.915 3 0.806 0.916 4 0.794 0.915 5 0.788 0.905 6 0.784 0.910 7 0.779 0.908 8 0.782 0.911 9 0.805 0.909 10 0.794 0.918 Average 0.792 0.911

From FIG. 2 and Table 2, it can be seen that the alloy-shell quantum dot produced by the manufacturing method according to one embodiment has a quantum efficiency of about 10% to 30% higher than the alloy quantum dot.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (17)

Adding a compound precursor of Group 12 elements, an organic solvent and an unsaturated fatty acid to a first reaction bath to obtain and heating a first mixed solution;
Adding a Group 16 element compound to a first surfactant in liquid form to obtain a second mixed solution;
Adding the second mixed solution to the heated first mixed solution in a range of 0.1 second to 5 seconds;
Synthesizing and separating alloy quantum dots after the addition and purification;
Adding a compound precursor of Group 12 element, an organic solvent and an unsaturated fatty acid to a second reaction tank to obtain and heating a third mixed solution;
Adding a compound precursor of a Group 16 element to a second surfactant in liquid form to obtain a fourth mixed solution;
Adding the alloy quantum dot and the fourth mixed solution to the heated third mixed solution; And
After the addition and purification, synthesizing and separating alloy-shell quantum dots
Lt; / RTI >
The compound precursor of the Group 12 element may be selected from the group consisting of zinc iodide, zinc bromide, zinc chloride, zinc fluoride, zinc acetate, zinc acetylacetonate, zinc carbonate, zinc cyanide, zinc nitrate, zinc oxide, Cadmium chloride, cadmium fluoride, cadmium carbonate, cadmium nitrate, dimethyl cadmium, diethyl cadmium, cadmium acetate, cadmium acetylacetonate, cadmium bromide, cadmium bromide, And any one selected from the group consisting of iodide, cadmium oxide, cadmium perchlorate, cadmium phosphide and cadmium sulfate,
Wherein the Group 16 element compound comprises sulfur and selenium.
The method of claim 1,
Wherein the second surfactant comprises at least one selected from the group consisting of octylamine, dioctylamine, trioctylamine, hexadecylamine, octahexadecylamine and dodecylamine.
The method of claim 1,
The first surfactant may be selected from the group consisting of trioctylphosphine oxide, tributylphosphine, triisopropylphosphine, triphenylphosphine oxide, tricyclohexylphosphine, Phosphine, and phosphine.
The method of claim 1,
The unsaturated fatty acids may be selected from the group consisting of lauric acid, palmitic acid, oleic acid, stearic acid, myristic acid, elaidic acid, The organic acid may be selected from the group consisting of eicosanoic acid, heneicosanoic acid, tricosanoic acid, docosanoic acid, tetracosanoic acid, hexacosanoic acid, A method for preparing quantum dots comprising at least one selected from the group consisting of heptacosanoic acid, octacosanoic acid and cis-13-docosenoic acid.
delete delete The method of claim 1,
The compound precursor of the Group 16 element is selected from the group consisting of hexane thiol, octane thiol, decane thiol, dodecane thiol, hexadecane thiol, sulfur-trioctylphosphine, sulfur-tributylphosphine, Wherein at least one selected from the group consisting of an amine, trimethylsilyl sulfide, ammonium sulfide, sodium sulfide, selenium-trioctylphosphine, selenium-tributylphosphine and selenium-triphenylphosphine.
The method of claim 1,
The organic solvent may be selected from the group consisting of 1-octadecene, 1-nonadecene, cis-2-methyl-7-octadecene, 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-undecene, 1-dodecene, 1-decene, and combinations thereof.
The method of claim 1,
In the step of adding the alloy quantum dots and the fourth mixed solution to the heated third mixed solution,
Wherein the alloy quantum dot is added in an amount of 100 mg to 500 mg.
The method of claim 1,
Heating and heating the first mixed solution, and heating and heating after obtaining the third mixed solution,
Wherein the heating is performed at a temperature of 200 to 350 占 폚.
delete The method of claim 1,
In the step of adding the alloy quantum dots and the fourth mixed solution to the heated third mixed solution,
And the addition of the fourth mixed solution is performed in a range of 10 minutes to 60 minutes.
An alloy-shell quantum dot produced according to the method of any one of claims 1 to 4, 7 to 10, and 12.
The method of claim 13,
The alloy-shell quantum dot has an average particle size in the visible light wavelength region of 3 nm to 10 nm.
The method of claim 14,
Wherein the visible light wavelength region is from 440 nm to 640 nm.
The method of claim 13,
The alloy-shell quantum dot has a half-width (FWHM) of 35 nm or less.
A backlight unit comprising the alloy-shell quantum dot of claim 13.

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