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CN-122003474-A - Quantum dot ink composition, method of preparing the same, and cured film, color filter and display device including the same

CN122003474ACN 122003474 ACN122003474 ACN 122003474ACN-122003474-A

Abstract

Disclosed are a quantum dot ink composition, a method of preparing the same, and a cured film, a color filter, and a display device including the same. The quantum dot ink composition includes a ligand compound particularly suitable for AIGS quantum dots, thereby further improving the optical properties and stability of the quantum dots. In addition, the method of preparing the quantum dot ink composition allows the substitution of the ligand compound on the surface of the quantum dot with good efficiency, and can allow the substituted ligand compound to be more strongly bound to the surface of the quantum dot to prepare the quantum dot ink composition having good physical properties, thereby providing a high-quality display device having further improved optical properties.

Inventors

  • Ji Jingxun
  • HE ZHENHE
  • Han Meilai
  • LI XIUZHEN
  • ZHAO YAYONG
  • Pei Runzhu
  • ZHANG YINZHU
  • Jin Jilan

Assignees

  • 韩松化学株式会社

Dates

Publication Date
20260508
Application Date
20250717
Priority Date
20240903

Claims (12)

  1. 1. A quantum dot ink composition comprising quantum dots having a ligand layer on the surface thereof and a photopolymerizable monomer, Wherein the quantum dots comprise silver, indium, gallium, and sulfur, and The ligand layer includes a compound represented by formula 1. [ 1] (In the formula 1, R 1 and R 2 are each independently a hydrogen atom or a methyl group, L 1 、L 2 and L 3 are each independently C 1 to C 20 hydrocarbyl, and N is an integer of 1 to 20).
  2. 2. The quantum dot ink composition according to claim 1, wherein the compound represented by formula 1 has a weight average molecular weight (M w ) of 100 to 2,000.
  3. 3. The quantum dot ink composition of claim 1, wherein the quantum dots are present in an amount of 1wt% to 50 wt%, based on the total weight of the quantum dot ink composition.
  4. 4. The quantum dot ink composition of claim 1, wherein the ligand layer comprises a compound represented by formula 2. [ 2] (In the formula 2, R 3 and R 4 are each independently a hydrogen atom or a methyl group, and O is an integer of 1 to 20).
  5. 5. The quantum dot ink composition of claim 1, further comprising: at least one selected from the group consisting of photoinitiators and scattering particles.
  6. 6. The quantum dot ink composition of claim 5, wherein the photoinitiator comprises at least one selected from the group consisting of phosphine oxide compounds, acetophenone compounds, benzophenone compounds, triazine compounds, bisimidazole compounds, oxime compounds, and thioxanthone compounds.
  7. 7. The quantum dot ink composition of claim 5, wherein the scattering particles comprise at least one selected from the group consisting of Al 2 O 3 、SiO 2 、ZnO、ZrO 2 、CaCO 3 、BaSO 4 、BaTiO 3 、TiO 2 、Ta 2 O 5 、Ti 3 O 5 、ITO、IZO、ATO、ZnO-Al、Nb 2 O 3 、SnO and MgO.
  8. 8. The quantum dot ink composition of claim 1, wherein the quantum dot ink composition has a viscosity of 30 cP or less and exhibits a light conversion rate of 29% or more with respect to blue light when measured on a cured product of the quantum dot ink composition having a thickness of 7 μιη.
  9. 9. A method of preparing a quantum dot ink composition comprising: (a) Performing a primary surface modification of quantum dots comprising silver, indium, gallium and sulfur using an X-type ligand; (b) Performing secondary surface modification of the quantum dot subjected to the primary surface modification using a compound represented by formula 1, and (C) The quantum dots subjected to the secondary surface modification are dispersed in a photopolymerizable compound. [ 1] (In the formula 1, R 1 and R 2 are each independently a hydrogen atom or a methyl group, L 1 、L 2 and L 3 are each independently C 1 to C 20 hydrocarbyl, and N is an integer of 1 to 20).
  10. 10. A cured film comprising the cured product of the quantum dot ink composition of any one of claims 1 to 8.
  11. 11. A color filter comprising the cured film of claim 10.
  12. 12. A display device comprising the color filter of claim 11.

Description

Quantum dot ink composition, method of preparing the same, and cured film, color filter and display device including the same Technical Field The invention relates to a quantum dot ink composition, a preparation method thereof, a cured film containing the same, a color filter and a display device. Background Quantum Dots (QDs), also called semiconductor nanocrystals, can emit various colors by generating light having different wavelengths according to particle diameters, and have advantages of better color purity and light stability than typical luminescent materials, and thus are attracting attention as next-generation light emitting elements. In particular, as a new trend in the display field, quantum dots are applicable to various displays, electronic devices, etc., as well as televisions and LEDs. Quantum dots represented by CdSe, inP, etc. have achieved rapid improvements in luminous efficiency (quantum yield), and various methods for synthesizing quantum dots having luminous efficiencies close to 100% have been introduced in the art. As a result, televisions with quantum dot sheets have been commercialized in the art. In contrast to quantum dot LED televisions, where light is filtered through a color filter layer incorporating quantum dots (excluding pigments and dyes), the next generation of self-luminescent quantum dot televisions are under development. In the development of such quantum dot televisions, a major issue is how long the quantum dot can maintain optical efficiency during the process of constructing the pixel and during fabrication. Recently, in response to the progress of using materials in pixels and solving the increase in manufacturing costs caused thereby, there is increasing interest in a method of reducing the use of materials as much as possible by applying the materials only to a desired area instead of patterning by spin coating or slit coating as in the art. The most representative method is an inkjet method in which a material is used only for a desired pixel to prevent waste of the material. Quantum dot compositions used in inkjet methods and having high viscosity may suffer from poor processability. To solve this problem, korean patent laid-open publication No. 10-2022-0023000 discloses a solvent-free quantum dot composition that does not contain a solvent to achieve low viscosity. However, in order to achieve low viscosity, the content of quantum dots is also limited to a certain level or less, resulting in an increase in the thickness of the pixel layer in order to achieve good optical efficiency. Disclosure of Invention Technical problem It is an object of the present invention to provide solvent-free quantum dot ink compositions comprising novel quantum dots exhibiting improved optical properties and stability, and a ligand compound suitable for the novel quantum dots. It is another object of the present invention to provide a quantum dot ink composition that can achieve low viscosity and also exhibit good light absorption and light conversion rate even at film thickness. It is a further object of the present invention to provide a cured film, a color filter and a display device comprising the cured product of the quantum dot ink composition. It is yet another object of the present invention to provide a method of preparing a quantum dot ink composition. It is to be understood that the present invention is not limited to the above-described objects, and that the above and other objects will become apparent to those skilled in the art from the following description. Technical proposal According to one aspect of the present invention, there is provided a quantum dot ink composition comprising a quantum dot having a ligand layer on a surface thereof, and a photopolymerizable monomer, wherein the quantum dot comprises silver, indium, gallium and sulfur, and the ligand layer comprises a compound represented by formula 1. [ 1] (In the formula 1, R 1 and R 2 are each independently a hydrogen atom or a methyl group, L 1、L2 and L 3 are each independently C 1 to C 20 hydrocarbyl, and N is an integer from 1 to 20. ) In the quantum dot ink composition, the compound represented by formula 1 may have a weight average molecular weight (Mw) of 100 to 2,000. In the quantum dot ink composition, the quantum dots may be present in an amount of 1 weight percent (wt%) to 50 wt% based on the total weight of the composition. In the quantum dot ink composition, the ligand layer may include a compound represented by formula 2. [ 2] (In the formula 2, R 3 and R 4 are each independently a hydrogen atom or a methyl group, and O is an integer of 1 to 20. ) The quantum dot ink composition may further include at least one selected from the group consisting of a photoinitiator and scattering particles. In the quantum dot ink composition, the photoinitiator may include at least one selected from the group consisting of a phosphine oxide compound, an acetophenone compound, a benzophenone compound, a tria