WO2017116014A1 - 양자점 및 이의 제조방법 - Google Patents

양자점 및 이의 제조방법 Download PDF

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WO2017116014A1
WO2017116014A1 PCT/KR2016/013869 KR2016013869W WO2017116014A1 WO 2017116014 A1 WO2017116014 A1 WO 2017116014A1 KR 2016013869 W KR2016013869 W KR 2016013869W WO 2017116014 A1 WO2017116014 A1 WO 2017116014A1
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quantum dot
acid
stable layer
mercapto
shell
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PCT/KR2016/013869
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English (en)
French (fr)
Korean (ko)
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정흥수
신성영
박상현
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주식회사 제우스
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Priority to CN201680051632.8A priority Critical patent/CN107949618B/zh
Publication of WO2017116014A1 publication Critical patent/WO2017116014A1/ko

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G11/00—Compounds of cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials

Definitions

  • the present invention relates to a quantum dot and a method of manufacturing the same.
  • Quantum Dot is a semiconductor nanoparticle, and has a property of emitting light different according to the size of the particle by the quantum isolation effect. Due to these characteristics, quantum dots are widely used not only in the field of optical devices but also in the field of biotechnology.
  • An object of the present invention is to provide a quantum dot excellent in quantum efficiency and conversion efficiency and a method of manufacturing the same.
  • Another object of the present invention is to provide a quantum dot excellent in stability and a manufacturing method thereof.
  • One aspect of the invention relates to quantum dots.
  • the quantum dot is a quantum dot including a core-shell structure having at least one stable layer, the quantum dot is a conversion efficiency of about 100 when the outermost fat-soluble ligand is substituted with a water-soluble ligand, about 100 More than%
  • Cw is the quantum efficiency of the quantum dot containing the water-soluble ligand at the outermost
  • Cf is the quantum efficiency of the quantum dot containing the fat-soluble ligand at the outermost
  • it may further include a first stable layer between the core and the shell and a second stable layer on the shell.
  • the quantum dots may further include a ligand layer on the outermost side.
  • the first stable layer may include one or more components having a content difference of about 15 mol% or less and the shell and one or more components having a content difference of about 15 mol% or less.
  • the second stable layer may include one or more components having a content difference of about 10 mol% or less from the shell.
  • the second stable layer may have a molar ratio of Group 12 elements and Group 16 elements of about 4: 6 to about 6: 4.
  • the core may have a diameter of about 1 nm to about 6 nm
  • the shell may have a thickness of about 0.5 nm to about 10 nm
  • the thickness of the first or second stable layer may be about 0.3 nm to about 2 nm. have.
  • the quantum dot may have an average diameter of about 6 nm to about 30 nm.
  • the quantum dot may have a quantum efficiency of about 80% or more.
  • the quantum dot may have a stability index of about 90% or more.
  • the full width at half maximum of the quantum dot may be about 40 nm or less.
  • the core, the shell, the first stable layer or the second stable layer may include at least one of a group 12-16 group compound, a group 13-15 group compound and a group 14-16 group compound.
  • the ligand layer comprises a fat soluble ligand, the fat soluble ligand is tri-n-octylphosphine oxide (tri-n-octylphosphine oxide), decylamine (decylamine), didecylamine, tridecylamine (tridecylamine) , Tetradecylamine, pentadecylamine, pentadecylamine, hexadecylamine, octadecylamine, octadecylamine, undecylamine, dioctadecylamine, dioctadecylamine, dioctadecylamine, N, N-dimethyldecyl N, N-dimethyldecylamine, N, N-dimethyldodecylamine, N, N-dimethylhexadecylamine, N, N-dimethyl tetradecylamine
  • the ligand layer comprises a water soluble ligand, wherein the water soluble ligand is silica, polyethylene glycol (PEG), mercapto propionic acid (MPA), cysteamine, mercapto-acetic acid, mercapto undecanol (mercapto-undecanol), 2-mercapto-ethanol, 1-thio-glycerol, deoxyribonucleic acid (DNA), mercapto acetic acid , Mercapto-undecanoic acid, 1-mercapto-6-phenyl-hexane, 1,16-dimercapto-hexadecane (1,16-dimecapto-) hexadecane), 18-mercapto-octadecyl amine, tri-octyl phosphine, 6-mercapto-hexane, 6-mercapto-hexane 6-mercapto-hexanoic acid, 16-mercapto-hexadecanoic acid, 18
  • the quantum dot may increase in mole% of cadmium (Cd) or selenium (Se) toward the center.
  • the core comprises at least one of cadmium (Cd) and selenium (Se)
  • the first stable layer comprises at least one of cadmium (Cd), selenium (Se) and zinc (Zn)
  • the shell may include at least one of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S)
  • the second stable layer may include cadmium (Cd), zinc (Zn), and sulfur (S). It may include one or more of.
  • the core comprises at least one of cadmium (Cd) and selenium (Se)
  • the first stable layer is made of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S).
  • the shell comprises one or more of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S)
  • the second stable layer is cadmium (Cd), selenium (Se) It may include one or more of zinc (Zn) and sulfur (S).
  • Another aspect of the invention relates to a method of manufacturing a quantum dot.
  • the method for manufacturing a quantum dot forming a core, forming a first stable layer on the core, forming a shell on the first stable layer, a second stable on the shell It may be a quantum dot manufacturing method for manufacturing a quantum dot having a conversion efficiency of about 100% or more according to Equation 1 including the step of forming a layer.
  • Cw and Cf are quantum quantum efficiency (Cw) of the quantum dot including the water-soluble ligand at the outermost and quantum dots containing the fat-soluble ligand at the outermost when substituting the outermost fat-soluble ligand with a water-soluble ligand) Efficiency (Cf).
  • the quantum dot manufacturing method may further include the step of substituting the water-soluble ligand of the outermost soluble ligand of the quantum dot.
  • the quantum dot manufacturing method may be a manufacturing method for manufacturing a quantum dot having a stability index of about 90% or more.
  • the present invention has the effect of providing a quantum dot excellent in quantum efficiency, conversion efficiency and stability and a method of manufacturing the same.
  • 1 is a cross-sectional view of a quantum dot according to an embodiment of the present invention.
  • Figure 2 is a graph showing the change in relative quantum efficiency with time of the quantum dots including the fat-soluble ligands of Example 1 and Comparative Example 1 of the present invention.
  • Example 3 is a graph showing the change in relative quantum efficiency with time of the quantum dot including the water-soluble ligand of Example 1 and Comparative Example 1 of the present invention.
  • the term “stable index” refers to an index indicating a degree of occurrence of defects or cracks on or inside a quantum dot for a predetermined time or more.
  • the final purified quantum dot powder is dissolved in a toluene solution at a concentration of about 0.1 mg / ml, stored in a fluorescent lamp and room temperature, the quantum efficiency is measured for 50 days, and means the value calculated by the following Equation 2.
  • the quantum dots containing water-soluble ligands were purified by centrifugation three times with chloroform and removed by free filtration through a filter, and the quantum dots were then bathed in water at about 95 ° C. for about 2 hours. It means the value computed by 3.
  • core-shell structure may mean a conventional core-shell structure, and also includes a structure in which the core or the shell is in several layers, and the "outermost” or “outer layer” is the most of the layers. It means the outer layer.
  • component means an element included in the core, shell, first stable layer, and second stable layer.
  • ligand layer may refer to a layer formed by a space occupied by a ligand.
  • each process constituting the method may occur differently from the stated order unless the context clearly indicates a specific order. That is, each process may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.
  • the quantum dot 100 of the present invention includes a core 10 -shell 20 structure having one or more stable layers, and the quantum dot has the outermost fat-soluble ligand substituted with a water-soluble ligand.
  • the conversion efficiency according to the following formula 1 is about 100% or more.
  • Cw is the quantum efficiency of the quantum dot containing the water-soluble ligand at the outermost
  • Cf is the quantum efficiency of the quantum dot containing the fat-soluble ligand at the outermost
  • the quantum dot 100 has a conversion efficiency of about 100, 105, 110, 120, 125, 130, 135, 140, and 145 when the outermost fat-soluble ligand is substituted with a water-soluble ligand. , 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, or 200%.
  • the conversion efficiency according to Equation 1 below may be in the range of at least one of the above values and at most one of the above values.
  • the quantum dot 100 may have a conversion efficiency of about 100% or more, specifically about 105% or more, and more specifically about 110% or more. have.
  • the quantum dots are excellent in quantum efficiency even in an aqueous solvent. Therefore, the quantum dots of the present invention are both excellent in quantum efficiency in the case of containing a water-soluble ligand, and the quantum efficiency is not reduced even if the ligand is substituted.
  • the diameter of the core 10 is about 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0 , 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5 , 5.6, 5.7, 5.8, 5.9, or 6.0 nm.
  • the diameter of the core 10 may be in the range of about one or more of the above values and about one or less of the above values.
  • the diameter of the core 10 may be about 1 nm to about 6 nm, specifically about 1.2 nm to about 5 nm, more specifically about 2 nm to about 5 nm. It may include two or more stable layers in the above range, there is an advantage that the optical efficiency of the quantum dot is excellent.
  • the thickness of the shell 20 is about 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 , 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0 , 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5 , 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.
  • the thickness of the shell 20 may range from one or more of the above values and about one or less of the above values.
  • the thickness of the shell 20 may be about 0.5 nm to about 10 nm, specifically about 0.5 nm to about 8 nm, more specifically about 0.5 nm to about 6 nm. In the above range, the stability of the quantum dot is increased.
  • the shell may comprise two or more shells.
  • Quantum dots 100 of the present invention include one or more stable layers.
  • the stable layer may be formed between or on the surface of the core-shell structure, and may increase the stability and reliability of the interior or surface of the core-shell structure.
  • the stable layer may be formed between the core and the shell and / or on the shell.
  • the components of the stable layer can be applied to the components applied to the core and the shell, by appropriately adjusting the content to improve the bonding strength between the layers, thereby increasing the stability and reliability of the core-shell structure.
  • the quantum dot 100 may further include a first stable layer 30 and a second stable layer 40 on the shell 20 between the core 10 and the shell 20.
  • the quantum dot 100 may further include a ligand layer (ligand) 50 at the outermost side.
  • the quantum dot 100 includes the first stable layer 30 and the second stable layer 40, thereby further increasing the stability or reliability of the quantum dot.
  • the first stable layer 30 is a layer that mediates the core 10 and the shell 20, and improves the bonding force between the core 10 and the shell 20, and has defects or cracks inside the core-shell. The occurrence of cracks can be prevented to increase the stability or reliability of the quantum dots.
  • the first stable layer 30 has a content difference of about 15 mol%, 14 mol%, 13 mol%, 12 mol%, 11 mol%, 10 mol%, 9 mol from the core 10. It may include one or more components that are%, 8 mol%, 7 mol%, 6 mol%, 5 mol%, 4 mol%, 3 mol%, 2 mol%, 1 mol%, or 0 mol% or less.
  • the first stable layer 30 may include one or more components having a content difference from the core 10 about one or more of the above values and about one or less of the above values.
  • the first stable layer 30 may include at least one component having a content difference of about 15 mol% or less, specifically about 13 mol% or less, and more specifically about 11 mol% or less. can do.
  • the first stable layer 30 has a content difference of about 15 mol%, 14 mol%, 13 mol%, 12 mol%, 11 mol%, 10 mol%, 9 mol%, 8 mol% from the shell 20. , 7 mol%, 6 mol%, 5 mol%, 4 mol%, 3 mol%, 2 mol%, 1 mol%, or 0 mol% or less.
  • the first stable layer 30 may include one or more components having a content difference from the shell 20 at least one of the above values and at least one of the above values.
  • the first stable layer 30 may include at least one component having a content difference of about 15 mol% or less, specifically about 13 mol% or less, and more specifically about 11 mol% or less. can do. In the above range, the stability of the core 10, the first stable layer 30, and the shell 20 increases.
  • the second stable layer 40 is a layer that mediates the shell 20 and the ligand layer 50, and improves the binding force between the shell 20 and the ligand layer 50 and defects on the core-shell surface. Or cracks can be prevented to increase the stability or reliability of the quantum dots.
  • the second stable layer may be to improve the binding force between the shell and the water-soluble ligand.
  • the quantum dot has an advantage that stability is further increased when the ligand is substituted from fat-soluble to water-soluble.
  • the second stable layer 40 has a content difference of about 10 mol%, 9 mol%, 8 mol%, 7 mol%, 6 mol%, 5 mol%, 4 mol%, 3 from the shell. It may comprise one or more components which are no greater than mol%, 2 mol%, 1 mol%, 0 mol%.
  • the second stable layer 40 may include at least one component having a content difference from the shell at least one of the above values and at least one of the above values.
  • the second stable layer 40 may include one or more components having a content difference of about 10 mol% or less, specifically about 9 mol% or less. In the above range, the stability of the shell 20, the second stable layer 40 and the ligand layer is increased.
  • the second stable layer 40 has a molar ratio of Group 12 elements and Group 16 elements of about 4: 6, 4.2: 5.8, 4.4: 5.6, 4.6: 5.4, 4.8: 5.2, 5: 5, 5.2: 4.8, 5.4: 4.6, 5.6: 4.4, 5.8: 4.2, 6: 4.
  • the second stable layer 40 may have a molar ratio of the Group 12 element and the Group 16 element in a range of at least one of the above ratios and at most one of the above ratios.
  • the second stable layer 40 may have a molar ratio of the Group 12 elements and the Group 16 elements of about 4: 6 to about 6: 4, specifically about 5: 5 to about 6: 4.
  • the quantum dot has an advantage that the stability is further increased when the ligand is substituted from fat-soluble to water-soluble.
  • the thickness of the first stable layer 30 or the second stable layer 40 is about 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0 nm.
  • the thickness of the first stable layer 30 or the second stable layer 40 may be in the range of at least one of the above numerical values and at most one of the above numerical values.
  • the thickness of the first stable layer 30 or the second stable layer 40 is about 0.3 nm to about 2 nm, specifically about 0.3 nm to about 1.5 nm, more specifically about 0.3 nm to about 1.0 nm. In the above range, the quantum dot has an advantage of excellent stability and conversion efficiency.
  • the thickness ratio of the first and second stable layers 30 and 40 may be about 0.5: about 1 to about 2: about 1. Quantum dots in the above range is excellent in stability.
  • the quantum dot has an average diameter of about 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27 , 28, 29, 30 nm.
  • the quantum dot may have a mean diameter in a range of at least one of the above values and at most one of the above values.
  • the quantum dots may have an average diameter of about 6 nm to about 30 nm, specifically about 6 nm to about 20 nm, more specifically about 6 nm to about 12 nm. In the above range, the quantum dot may include two or more stable layers, and has excellent optical characteristics.
  • the ratio of the shell and the thickness of the first stable layer 30 or the second stable layer 40 may be about 1: about 0.5 to about 1: about 10, specifically about 1: about 0.5 to about 1: about 9. have.
  • the quantum dots are excellent in the balance of stability, quantum efficiency and conversion efficiency and optical characteristics.
  • the core, the shell, the first stable layer or the second stable layer may include at least one of a group 12-16 group compound, a group 13-15 group compound and a group 14-16 group compound.
  • the Group 12-16 compound is cadmium sulfide (CdS), cadmium selenide (CdSe), cadmium tellenide (CdTe), zinc sulfide (ZnS), zinc selenide (ZnSe), zinc tellenide (ZnTe), mercury sulfide (HgS), Mercury Selenide (HgSe), Mercury Tellenide (HgTe), Zinc Oxide (ZnO), Cadmium Oxide (CdO), Mercury Oxide (HgO), Cadmium Selenium Sulfide (CdSeS), Cadmium Selenium Telide (CdSeTe) Cadmium sulfide telluride (CdSTe), cadmium zinc sulfide (CdZnS), cadmium zinc selenide (CdZnSe), cadmium sulfide selenide (CdSSe), cadmium zinc telleneide (CdZnTe),
  • the Group 13-15 group compounds are gallium phosphorus (GaP), gallium arsenide (GaAs), gallium antimony (GaSb), gallium nitride (GaN), aluminum phosphorus (AlP), aluminum arsenide (AlAs), Aluminum Antimony (AlSb), Aluminum Nitride (AlN), Indium Phosphorus (InP), Indium Arsenide (InAs), Indium Antimony (InSb), Indium Nitride (InN), Gallium Phosphorus Arsenide (GaPAs) , Gallium phosphorus antimony (GaPSb), gallium phosphorus nitride (GaPN), gallium arsenide nitride (GaAsN), gallium antimony nitride (GaSbN), aluminum phosphorus arsenide (AlPAs), aluminum phosphorus antimony Monium (AlPSb), Aluminum Phosphorus Nitride (AlPN), Aluminum Arsenide
  • the Group 14-16 group compounds include tin oxide (SnO), tin sulfide (SnS), tin selenide (SnSe), tin tellenide (SnTe), lead sulfide (PbS), lead selenide (PbSe), lead tellenide (PbTe), germanium oxide (GeO), germanium sulfide (GeS), germanium selenide (GeSe), germanium tellenide (GeTe), tin selenium sulfide (SnSeS), tin selenium tellenide (SnSeTe), tin Sulfide tellenide (SnSTe), lead selenium sulfide (PbSeS), lead selenium tellenide (PbSeTe), lead sulfide tellenide (PbSTe), tin lead sulfide (SnPbS), tin lead selenide (SnPbS),
  • the core 10, the shell 20, the first stable layer 30, or the second stable layer 40 may include three or more components.
  • the shell 20, the first stable layer 30, and the second stable layer 40 may include three or more components, but are not limited thereto.
  • the core 10 may include cadmium (Cd) and selenium (Se).
  • the shell 20, the first stable layer 30, or the second stable layer 40 may include at least one of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S).
  • the core, shell and stable layer may include cadmium (Cd).
  • the quantum dots may increase in content of cadmium (Cd) or selenium (Se) (mol%) toward the center.
  • the quantum dot is the core includes at least one of cadmium (Cd) and selenium (Se), the first stable layer is at least one of cadmium (Cd), selenium (Se) and zinc (Zn) Wherein the shell comprises at least one of cadmium (Cd), selenium (Se), zinc (Zn) and sulfur (S), and wherein the second stable layer is cadmium (Cd), zinc (Zn) and sulfur It may comprise one or more of (S).
  • the core comprises at least one of cadmium (Cd) and selenium (Se)
  • the first stable layer is made of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S).
  • the shell comprises one or more of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S)
  • the second stable layer is cadmium (Cd), selenium (Se) It may include one or more of zinc (Zn) and sulfur (S).
  • the first stable layer has a difference in content between the core and cadmium (Cd) or selenium (Se) of about 15 mol% or less, specifically about 13 mol% or less, and more specifically about 11 mol% or less, and the shell and
  • the difference in content of zinc (Zn) may be about 15 mol% or less, specifically about 13 mol% or less, and more specifically about 11 mol% or less.
  • the second stable layer may have a difference in content between the shell and sulfur (S) or zinc (Zn) of about 10 mol% or less, specifically about 9 mol% or less.
  • the second stable layer may have a sulfur (S) content of about 40 mol% to about 50 mol%, specifically about 40 mol% to about 48 mol%, and more specifically about 41 mol% to about 46 mol%. have. In the above range, the quantum dots are excellent in conversion efficiency.
  • the quantum dot is, for example, the core 10 of the quantum dot 100 is about 50 to about 60 mol% cadmium (Cd), specifically about 53 to about 57 mol%, selenium (Se) about 40 to About 50 mole%, specifically about 53 to about 57 mole%.
  • the quantum dots are excellent in quantum efficiency and optical properties at a wavelength of about 500 nm to about 560 nm.
  • the quantum dots are, for example, the core 10 of the quantum dots 100 is about 75 to about 85 mol% cadmium (Cd), specifically about 78 to about 82 mol%, selenium (Se) about 15 to About 25 mole%, specifically about 18 to about 22 mole%.
  • the quantum dots are excellent in quantum efficiency and optical properties in the wavelength range of about 560 nm to about 630 nm.
  • the first stable layer 30 is about 45 to about 55 mol%, specifically about 48 to about 52 mol% cadmium (Cd), about 18 to about 28 mol%, specifically about 21 selenium (Se) To about 25 mol%, zinc (Zn) about 22 to about 32 mol%, specifically about 25 to about 29 mol%.
  • the quantum dots are excellent in conversion efficiency and optical properties in the wavelength range from about 500 nm to about 560 nm.
  • the first stable layer 30 is about 21 to about 31 mol% cadmium (Cd), specifically about 24 to about 28 mol%, about 2 to about 12 mol% selenium (Se), specifically about 5 To about 10 mol%, about 7 to about 17 mol% zinc (Zn), specifically about 10 to about 14 mol%, about 49 to about 59 mol% sulfur (S), specifically about 52 to about 56 mol% It may include.
  • the quantum dots are excellent in conversion efficiency and optical properties in the wavelength range of about 560 nm to about 630 nm.
  • the shell 20 comprises about 9 to about 19 mole percent of cadmium (Cd), specifically about 12 to about 17 mole percent, about 0.5 to about 10 mole percent of selenium (Se), specifically about 2 to about 6 mol%, zinc (Zn) about 32 to about 42 mol%, specifically about 35 to about 39 mol%, sulfur (S) about 39 to about 49 mol%, specifically about 42 to about 46 mol% Can be.
  • Cd cadmium
  • Se selenium
  • Zn zinc
  • S sulfur
  • S sulfur
  • the shell 20 comprises about 9 to about 19 mole percent of cadmium (Cd), specifically about 12 to about 17 mole percent, about 0.5 to about 10 mole percent of selenium (Se), specifically about 2 to about 6 mol%, zinc (Zn) about 32 to about 42 mol%, specifically about 35 to about 39 mol%, sulfur (S) about 39 to about 49 mol%, specifically about 42 to about 46 mol% Can be.
  • the quantum dots are excellent in conversion efficiency and
  • the shell 20 has about 21 to about 31 mole percent of cadmium (Cd), specifically about 24 to about 28 mole percent, about 0.5 to about 8 mole percent of selenium (Se), specifically about 0.5 to about 4 mole%, zinc (Zn) about 11 to about 21 mole%, specifically about 14 to about 19 mole%, sulfur (S) about 51 to about 61 mole%, specifically about 53 to about 58 mole% Can be.
  • Cd cadmium
  • Se selenium
  • Zn zinc
  • S sulfur
  • S sulfur
  • the quantum dots are excellent in conversion efficiency and optical characteristics at a wavelength of about 560 nm to about 630 nm.
  • the second stable layer 40 comprises about 7 to about 17 mole percent of cadmium (Cd), specifically about 10 to about 14 mole percent, about 39 to about 49 mole percent of zinc (Zn), specifically about 42 to about 46 mole%, sulfur (S) about 39 to about 49 mole%, specifically about 42 to about 46 mole%.
  • the quantum dot has excellent stability index, quantum efficiency, conversion efficiency, and optical characteristics at a wavelength of about 500 nm to about 560 nm.
  • the second stable layer 40 comprises about 26 to about 36 mole percent of cadmium (Cd), specifically about 29 to about 33 mole percent, about 0.1 to about 5 mole percent of selenium (Se), specifically about 0.1 to about 3 mol%, zinc (Zn) about 20 to about 30 mol%, specifically about 23 to about 27 mol%, sulfur (S) about 38 to about 48 mol%, specifically about 41 to about 45 mol% It may include.
  • the quantum dot has excellent stability index, quantum efficiency, conversion efficiency, and optical characteristics at a wavelength of about 560 nm to about 630 nm.
  • the quantum dot 100 may further include a ligand layer 50 at the outermost side.
  • the ligand layer 50 is illustrated in a form in which the ligand is bonded to the second stable layer, but the ligand layer 50 may mean a layer formed by a space occupied by the ligand.
  • the ligand layer 50 comprises a fat-soluble ligand
  • the fat-soluble ligand is tri-n-octylphosphine oxide (tri-n-octylphosphine oxide), decylamine, didecylamine (didecylamine) ), Tridecylamine, tetratradecylamine, pentadecylamine, pentadecylamine, hexadecylamine, octadecylamine, undecylamine, undecylamine, dioctadecylamine ), N, N-dimethyldecylamine, N, N-dimethyldodecylamine, N, N-dimethylhexadecylamine, N, N-dimethyldecylamine, N N, N-dimethyltedecylamine, N, N-dimethyltridecylamine, N, N-dimethylunde
  • the quantum dots may include tri-n-octylphosphine as a fat-soluble ligand.
  • the quantum dot 100 includes a fat-soluble ligand, there is a stable effect in the organic solvent.
  • the ligand layer 50 comprises a water soluble ligand, wherein the water soluble ligand is silica, polyethylene glycol (PEG), mercapto propionic acid (MPA), cysteamine, mercapto acetic acid (mercapto-acetic acid) acetic acid, mercapto-undecanol, 2-mercapto-ethanol, 1-thio glycerol, deoxyribonucleic acid (DNA), Mercapto acetic acid, mercapto-undecanoic acid, 1-mercapto-6-phenyl-hexane, 1,16-dimercapto-hexa Decane (1,16-dimecapto-hexadecane), 18-mercapto-octadecyl amine, tri-octyl phosphine, 6-mercapto-hexane (6-mercapto-hexane hexane), 6-mercapto-hexanoic acid, 16-mercapto-he
  • the quantum dots can include mercapto propionic acid (MPA) as the water soluble ligand.
  • MPA mercapto propionic acid
  • the quantum dot 100 includes a water soluble ligand, there is an advantage in that the quantum dot is dispersed in a water soluble solvent.
  • the ligand layer 50 may have a thickness of about 0.1 nm to about 50 nm, specifically about 0.1 nm to about 20 nm, and more specifically about 0.1 nm to about 10 nm.
  • the quantum dot has the advantage that the physical properties according to the ligand is expressed, excellent dispersibility.
  • Quantum dots 100 have about 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93% , 94%, 95%, 96%, 97%, 98%, 99%, or 100%.
  • the quantum dot 100 may have a quantum efficiency in a range of at least one of the above values and at most one of the above values.
  • the quantum dot 100 may have a quantum efficiency of about 80% or more, specifically 85% or more, and more specifically about 90% or more. In the above range, the quantum dot is excellent in optical properties.
  • the quantum dots of the present invention not only have a high quantum efficiency immediately after synthesis, but also have a high stability index as described above, and thus, the quantum efficiency does not decrease even after a certain period of time after synthesis, thereby maintaining the quantum efficiency for a long time.
  • the quantum dot may have a stability index of about 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%.
  • the quantum dot may have a stability index in a range of at least one of the above numerical values and at most one of the above numerical values.
  • the quantum dots may have a stability index of about 90% or more, specifically about 95% or more, and more specifically about 98% or more. In the above range, the quantum dot has the advantage of excellent reliability, quantum efficiency is continuously excellent.
  • the stability index is an index indicating a degree of defects or cracks on the surface or inside of the quantum dot for a predetermined time or more, and the higher the stability index, the more stable the quantum dot is without the occurrence of defects or cracks. exist. If defects or cracks occur in the quantum dots, the quantum efficiency is drastically lowered. Therefore, a quantum dot having a high stability index means not only excellent reliability but also high quantum efficiency continuously.
  • the stability index may be measured by different methods for quantum dots including a fat-soluble ligand and quantum dots including a water-soluble ligand.
  • quantum dots containing a fat-soluble ligand after quantum dot synthesis, the quantum dots are mixed with a solvent (nucleic acid: toluene about 1: 1), followed by precipitation by centrifugation, and purification by centrifugation by adding acetone to the precipitated quantum dots. After repeated three times, the final purified quantum dot powder is dissolved in toluene solution at a concentration of about 0.1mg / ml, stored in a fluorescent lamp and room temperature, the quantum efficiency is measured for 50 days, and is the value calculated by the following equation (2). .
  • Equation 2 0 day quantum efficiency means quantum efficiency immediately after purification, and 50 day quantum efficiency means quantum efficiency after 50 days of storage at room temperature in toluene solution after purification.
  • the quantum dots containing water-soluble ligands were purified by centrifugation three times with chloroform and removed by free filtration through a filter, and the quantum dots were then bathed in water at about 95 ° C. for about 2 hours. It means the value computed by 3.
  • the full width at half maximum of the quantum dot may be about 40 nm or less, specifically about 38 nm or less, and more specifically about 35 nm or less. Quantum dots in the above range has the advantage of good color implementation.
  • Another aspect of the invention relates to a method of manufacturing a quantum dot.
  • the method of manufacturing the quantum dot is transformed by the following equation 1 comprising forming a core, forming a first stable layer, forming a shell, forming a second stable layer
  • the efficiency may be at least about 100%, specifically at least about 105%, more specifically at least about 110%.
  • Cw and Cf are quantum quantum efficiency (Cw) of the quantum dot including the water-soluble ligand at the outermost and quantum dots containing the fat-soluble ligand at the outermost when substituting the outermost fat-soluble ligand with a water-soluble ligand) Efficiency (Cf).
  • the water soluble ligand is silica, polyethylene glycol (PEG), mercapto propionic acid (MPA), cysteamine, mercapto-acetic acid, mercapto-undecanol, 2-mercapto Ethanol (2-mercapto-ethanol), 1-thio-glycerol, deoxyribonucleic acid (DNA), mercapto acetic acid, mercapto-undecanoic acid), 1-mercapto-6-phenyl-hexane, 1,16-dimecapto-hexadecane, 18-mercapto-octadecyl Amine (18-mercapto-octadecyl amine), tri-octyl phosphine, 6-mercapto-hexane, 6-mercapto-hexanoic acid ), 16-mercapto-hexadecanoic acid, 18-mercapto-octadecylamine, 6-mercapto-hexylamine
  • the quantum dot manufacturing method may have no purification process after the core forming step, after forming the first stable layer, and after forming the shell.
  • the quantum dot manufacturing method is the step of forming the first stable layer, forming the shell, and forming the second stable layer, the product produced in the previous step in the reaction tank containing the reactants of each step It may be a method of input.
  • Forming the core comprises heating the first mixture comprising a core precursor, ligand for core and buffer for about 1 minute to about 10 minutes, specifically about 1 minute to about 5 minutes, to form core-ligand particles.
  • a core precursor ligand for core and buffer for about 1 minute to about 10 minutes, specifically about 1 minute to about 5 minutes, to form core-ligand particles.
  • ligand for core and buffer for about 1 minute to about 10 minutes, specifically about 1 minute to about 5 minutes, to form core-ligand particles.
  • the core precursor may include a cationic core precursor and an anion core precursor.
  • the cationic core precursor may include one or more of Group 12 elements and Group 13 elements, and the anion core precursor may include one or more of Group 15 elements and Group 16 elements.
  • the cationic core precursor includes at least one of zinc (Zn), cadmium (Cd), and indium (In), and the anion core precursor is sulfur (S), selenium (Se), tellurium (Te) And phosphorus (P).
  • the core precursor may include one or more of cadmium (Cd) and selenium (Se).
  • the heating may be to about 250 ° C to about 350 ° C, specifically about 270 ° C to about 340 ° C, more specifically about 300 ° C to about 340 ° C. In the above range, core yield is increased, and the amount of unreacted precursor is decreased.
  • the ligand for the core is octanethiol, decanethiol, dodecanethiol, dodecanethiol, lauric acid, palmitic acid, oleic acid, tri-n-octyl Phosphine oxide (tri-n-octylphosphine oxide), tri-n-octylphosphine (tri-n-octylphosphine), octylamine, octylamine, decylamine, didecylamine, tridecylamine ( It may include one or more of tridecylamine, tetradecylamine, pentadecylamine, pentadecylamine, hexadecylamine, octadecylamine and dodecylamine.
  • the ligand for the core may use oleic acid or tri-n-octylphosphine.
  • the buffer is 1-octadecene, 1-nonadecene, 1-nonadecene, cis-2-methyl-7-octadecene, 1-heptadecene 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, 1-undecene It may include one or more of 1-undecene, 1-dodecene and 1-decene.
  • 1-octadecene may be used as a buffer.
  • the forming of the first stable layer may be performed by heating a reactor including a first stable layer precursor and a ligand for the first stable layer for about 1 minute to about 20 minutes, specifically about 5 minutes to about 15 minutes.
  • the core-ligand particles may be introduced to form core-first stable layer-ligand particles.
  • the first stable layer precursor may include one or more of Group 12 elements, Group 13 elements, Group 15 elements, and Group 16 elements.
  • the first stable layer precursor may include one or more of zinc (Zn), cadmium (Cd), indium (In), sulfur (S), selenium (Se), tellurium (Te), and phosphorus (P).
  • Zn zinc
  • Cd cadmium
  • In indium
  • S sulfur
  • S selenium
  • Te tellurium
  • P phosphorus
  • the first stable layer precursor may include at least one of cadmium (Cd), selenium (Se), and sulfur (S).
  • the heating may be to about 250 ° C to about 350 ° C, specifically about 270 ° C to about 330 ° C, more specifically about 270 ° C to about 310 ° C. In the above range, the yield of the first stable layer increases, and the amount of unreacted precursor decreases.
  • the ligand for the first stable layer is octanethiol, decanethiol, dodecanethiol, lauric acid, palmitic acid, oleic acid, tri-n Tri-n-octylphosphine oxide, tri-n-octylphosphine, octylamine, decylamine, didecylamine, tridecyl It may include one or more of amine (tridecylamine), tetradecylamine, pentadecylamine, pentadecylamine, hexadecylamine, octadecylamine and dodecylamine.
  • the dodecanethiol may be used as the ligand for the first stable layer.
  • the forming of the shell may include heating the reactor including the shell precursor and the ligand for the shell for about 5 minutes to about 40 minutes, specifically about 15 minutes to about 30 minutes, and the core-first stable layer-ligand prepared above.
  • the particles may be introduced to form core-first stable layer-shell-ligand particles.
  • the shell precursor may include one or more of Group 12 elements, Group 13 elements, Group 15 elements, and Group 16 elements.
  • the shell precursor may include one or more of zinc (Zn), cadmium (Cd), indium (In), sulfur (S), selenium (Se), tellurium (Te), and phosphorus (P).
  • the shell precursor may include one or more of cadmium (Cd), selenium (Se), zinc (Zn), and sulfur (S).
  • the heating may be to about 250 ° C to about 350 ° C, specifically about 270 ° C to about 330 ° C, more specifically about 270 ° C to about 310 ° C. In the above range, the yield of the shell increases, and the amount of precursor that does not react decreases.
  • the ligand for the shell is octanethiol, decanethiol, dodecanethiol, dodecanethiol, lauric acid, palmitic acid, oleic acid, tri-n-octylphos Tri-n-octylphosphine oxide, tri-n-octylphosphine, octylamine, decylamine, didecylamine, tridecylamine ), Tetradecylamine, pentradecylamine, pentadecylamine, hexadecylamine, octadecylamine, and dodecylamine.
  • the ligand for the shell may use tri-n-octylphosphine.
  • the forming of the second stable layer may be prepared by heating a reactor including a second stable layer precursor and a ligand for the second stable layer for about 10 minutes to about 60 minutes, specifically about 20 minutes to about 40 minutes.
  • the core-first stable layer-shell-ligand particles may be introduced to form core-first stable layer-shell-second stable layer-ligand particles.
  • the second stable layer precursor may include one or more of Group 12 elements, Group 13 elements, Group 15 elements, and Group 16 elements.
  • the second stable layer precursor may include one or more of zinc (Zn), cadmium (Cd), indium (In), sulfur (S), selenium (Se), tellurium (Te), and phosphorus (P).
  • Zn zinc
  • Cd cadmium
  • In indium
  • S sulfur
  • S selenium
  • Te tellurium
  • P phosphorus
  • the second stable layer precursor may include at least one of cadmium (Cd), selenium (Se), and sulfur (S).
  • the heating may be to about 250 ° C to about 350 ° C, specifically about 270 ° C to about 330 ° C, more specifically about 270 ° C to about 310 ° C. In the above range, the yield of the second stable layer increases, and the amount of unreacted precursor decreases.
  • the ligand for the second stable layer is octanethiol, decanethiol, dodecanethiol, lauric acid, palmitic acid, oleic acid, tri-n Tri-n-octylphosphine oxide, tri-n-octylphosphine, octylamine, decylamine, didecylamine, tridecyl It may include one or more of amine (tridecylamine), tetradecylamine, pentadecylamine, pentadecylamine, hexadecylamine, octadecylamine and dodecylamine.
  • the dodecanethiol may be used as the ligand for the second stable layer.
  • the quantum dot manufacturing method may further include the step of replacing the fat-soluble ligand of the quantum dot with a water-soluble ligand.
  • the core-first stable layer-shell-second stable layer-ligand (lipophilic) particles prepared above may be added to a reactor including a water-soluble ligand precursor.
  • the quantum dot manufacturing method may be a quantum dot manufacturing method for manufacturing a quantum dot having a stability index of the quantum dot is about 90% or more, specifically about 95% or more, more specifically about 98% or more.
  • the stability index is substantially the same as that described in the quantum dot, which is one aspect of the present invention.
  • the quantum dot manufacturing method may further include a purification step.
  • the purifying step may include precipitating the quantum dots in a nonpolar solvent and centrifuging the quantum dots.
  • the present invention is characterized in that it only includes a purification step after the formation of the quantum dot is completed, and does not include a purification step during quantum dot synthesis. By applying the purification step to a minimum, the quantum dot synthesis yield is high, there is an advantage that can prevent the degradation of the stability of the quantum dots.
  • Each step of the quantum dot manufacturing method may be performed in an inert gas atmosphere.
  • the inert gas is not limited as long as it belongs to group 18 gas.
  • the inert gas may include, for example, one or more of argon, neon, helium, krypton, xenon and radon.
  • the second stable layer material was prepared by reacting 1 g of Zn (Ac), 0.21 g of CdO, Oleic Acid (10 mL), and Octadecene (35 mL) at 300 ° C, and injecting 5 ml of the shell. 30 minutes, 0.5 ml of dodecanethiol, and then 20 minutes of reaction to form a second stable layer.
  • the mixture was purified with a mixture of ethanol and toluene, dissolved in an organic solvent, and dispersed to form a core-.
  • a first stable layer-shell-second stable layer-ligand (lipophilic) quantum dot was formed.
  • the stability index and quantum efficiency of the core-first stable layer-shell-second stable layer-ligand (lipophilic) quantum dot were measured and shown in Table 1 below.
  • the prepared core-first stable layer-shell-second stable layer particles were added to a reaction tank containing mercapto propionic acid (MPA), and reacted at 60 ° C. for 60 minutes to react with the core-first stable layer.
  • a shell-second stable layer-soluble ligand quantum dot was formed.
  • the core content of the quantum dot is 55 mol% cadmium (Cd), 45 mol% selenium, the content of the first stable layer is 50 mol% cadmium (Cd), 23 mol% selenium, 27 mol% zinc, the shell
  • the content of the second stable layer is cadmium (Cd) 12 mol%, zinc 44 mol%, sulfur 44 Mol%.
  • the core had a particle diameter of 2.5 nm, and the thicknesses of the first stable layer, the shell, and the second stable layer were 0.45 nm, 2.9 nm, and 0.4 nm, respectively.
  • the thickness of the water soluble ligand layer was 0.4 nm.
  • a second stable layer material was prepared by reacting 1 g of Zn (Ac), 0.21 g of CdO, 10 mL of oleic acid, and 35 mL of octadecene at 300 ° C. after the formation of a shell, and injecting 5 ml of this for 30 minutes. After reacting, 0.5 ml of dodecanethiol was injected and reacted for 20 minutes to finally form a second stable layer, purified with a mixture of ethanol and toluene, dissolved in an organic solvent, and dispersed to form a core-first compound. A stable layer-shell-second stable layer-ligand (lipophilic) quantum dot was formed.
  • the stability index and quantum efficiency of the core-first stable layer-shell-second stable layer-ligand (lipophilic) quantum dot were measured and shown in Table 1 below.
  • the prepared core-first stable layer-shell-second stable layer particles were added to a reaction tank containing mercapto propionic acid (MPA), and reacted at 60 ° C. for 60 minutes to react with the core-first stable layer.
  • a shell-second stable layer-soluble ligand quantum dot was formed.
  • the core content of the quantum dots is 80 mol% of cadmium (Cd) and 20 mol% of selenium, and the content of the first stable layer is 26.5 mol% of cadmium (Cd), 7.5 mol% of selenium (Se), and zinc (Zn).
  • the core content of the quantum dots is 80 mol% of cadmium (Cd) and 20 mol% of selenium
  • the content of the first stable layer is 26.5 mol% of cadmium (Cd), 7.5 mol% of selenium (Se), and zinc (Zn).
  • the content of the second stable layer is 31 mol% of cadmium (Cd), 1 mol% of selenium (Se), 25 mol% of zinc (Zn), and 43 mol% of sulfur (S), and the core has a particle diameter of 4 nm.
  • the thickness of each of the 1st stable layer, the shell, and the 2nd stable layer was 0.5 nm, 0.75 nm, 0.75 nm, and the thickness of the water-soluble ligand layer was 0.4 nm.
  • the stability index, quantum efficiency, conversion efficiency and the like are measured in the same manner as in Example 1 and shown in Table 1 below.
  • a quantum dot was synthesized in the same manner as in Example 1, except that the first stable layer and the second stable layer were not formed, and the core and shell contents were adjusted as follows, and the core-shell-ligand (lipophilic) quantum dot was formed. And the stability index, the quantum efficiency, and the conversion efficiency of the core-shell-soluble ligand quantum dot are shown in Table 1 below.
  • the core content of the quantum dot is 20 mol% cadmium (Cd), 13 mol% selenium, 50 mol% zinc, 17 mol% sulfur, the shell content is 5 mol% selenium, 41 mol% zinc, 54 mol% sulfur. It was.
  • the core had a particle diameter of 5.8 nm and a shell thickness of 2.4 nm.
  • the thickness of the water soluble ligand layer was 0.4 nm.
  • a quantum dot was synthesized in the same manner as in Example 1 except that the first stable layer was not formed, and the core-shell-second stable layer-ligand (lipophilic) quantum dot and the core-shell-second stable layer-water soluble ligand
  • the stability index, the quantum efficiency and the conversion efficiency of the quantum dot were measured and shown in Table 1 below.
  • the core content of the quantum dot is 42 mol% cadmium (Cd), 34 mol% selenium, 12 mol% zinc, 12 mol% sulfur, the shell content is 13 mol% cadmium (Cd), 7.5 mol% selenium, 41 mol% zinc, 38.5 mol% sulfur, and the content of the second stable layer was 47 mol% cadmium (Cd), 46 mol% zinc, and 7 mol% sulfur.
  • the core had a particle diameter of 1.8 nm, and the thicknesses of the shell and the second stable layer were 2.1 nm and 0.55 nm, respectively.
  • the thickness of the water soluble ligand layer was 0.4 nm.
  • a quantum dot was synthesized in the same manner as in Example 2 except that the first stable layer was not formed, and the core-first stable layer-shell-ligand (lipophilic) quantum dot and the core-first stable layer-shell-water-soluble ligand were The stability index, the quantum efficiency and the conversion efficiency of the quantum dot were measured and shown in Table 1 below.
  • the core content of the quantum dot is 62 mol% cadmium (Cd), 38 mol% selenium, the content of the shell is 48 mol% cadmium (Cd), 12 mol% selenium, 12 mol% zinc, 28 mol% sulfur,
  • the content of the second stable layer was 10 mol% cadmium (Cd), 10 mol% selenium, 33 mol% zinc, 47 mol% sulfur.
  • the core had a particle diameter of 2.3 nm and the thicknesses of the shell and the second stable layer were 2.5 nm and 0.5 nm, respectively.
  • the thickness of the water soluble ligand layer was 0.4 nm.
  • Comparative example One 2 One 2 3 Structure core ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 1st stable layer ⁇ ⁇ ⁇ ⁇ ⁇ Shell ⁇ ⁇ ⁇ ⁇ ⁇ 2nd stable layer ⁇ ⁇ ⁇ ⁇ ⁇ Quantum Efficiency (%) Fat-soluble ligand (outermost) 90 90 60 80 70 Water soluble ligand (outermost) 100 100 44 60 50 Conversion efficiency (%) 110 110 73 75 71 Stability Index (%) Fat-soluble ligand (outermost) 100 98 50 60 64 Water soluble ligand (outermost) 100 100 20 62 60
  • the quantum dot of the present invention including the first stable layer and the second stable layer in the core, the shell is not only excellent in quantum efficiency, but also excellent in stability index and conversion efficiency.
  • Comparative Examples 1 to 3 which do not include any of the first stable layer and the second stable layer, it can be seen that the quantum efficiency, the stability index, and the conversion efficiency are significantly reduced.
  • Quantum efficiency (%): Quantum efficiency was measured using QE-SERIES QUANTUM EFFICIENCY MEASUREMENT SYSTEM (Otsuka Electronics): Rate of the number of fluorescence photons to the number of absorbed photons.
  • Cw is the quantum efficiency of the quantum dot containing the water-soluble ligand at the outermost
  • Cf is the quantum efficiency of the quantum dot containing the fat-soluble ligand at the outermost
  • 0 day quantum efficiency means quantum efficiency immediately after purification
  • 50 day quantum efficiency means quantum efficiency for 0 day quantum efficiency after storage for 50 days at room temperature in toluene solution after purification
  • Quantum dots containing water soluble ligands After quantum dot synthesis, centrifuged three times with chloroform and purified by a method of removing the free ligand through a filter, the quantum dots were then heated in 95 °C water for 2 hours, and then It calculated by Formula 3 and described in the said Table 1. The change in quantum efficiency (based on 100% quantum efficiency before boiling) of the quantum dots including the water-soluble ligands of Example 1 and Comparative Example 1 is shown graphically in FIG. 3.

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KR102207330B1 (ko) * 2020-06-03 2021-01-28 주식회사 신아티앤씨 카르복시기를 포함하는 (메타)아크릴레이트 구조의 양자점 리간드용 화합물, 상기 화합물로 형성된 리간드를 포함하는 양자점 입자, 상기 양자점 입자를 포함하는 양자점 입자 조성물, 및 상기 화합물의 제조방법
CN111875896B (zh) * 2020-07-29 2021-12-28 武汉珈源同创科技有限公司 一种量子点高分子复合物及其制备方法

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