Quantum dot-polymer composite particles and method for preparing same

Patent metadata

Field	Value
Publication number	US-12570896-B2
Application number	US-202017761130-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Sep 18, 2019
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

The present invention relates to quantum dot-polymer composite particles and a method for preparing same, the composite particles comprising: quantum dots; and a (meth)acrylic polymer coating layer formed to surround the surface of the quantum dots, and to a technology for expanding the application of quantum dots which can ensure high stability and excellent luminous efficiency by including the polymer coating layer.

First claim

The invention claimed is:

1 . Quantum dot-polymer composite particles, comprising:
a quantum dot (QD); and a (meth)acrylic polymer coating layer formed to enclose the quantum dot, wherein the quantum dot-polymer composite particles are obtained by a process comprising: (i) preparing a polymer-containing solution in which a polymer is dissolved; (ii) adding and mixing quantum dots with the polymer-containing solution and then curing a resulting mixture by addition of a polymer curing inducer added in an amount of 2 to 30 parts by weight relative to a total weight of the polymer-containing solution prior to curing; and (iii) separating a cured product from the polymer-containing solution and drying the cured product, wherein the quantum dot comprises a surface treatment layer containing an organic halide, an inorganic halide, an inorganic oxyhalide, or a mixture thereof, wherein the polymer curing inducer comprises a Zn-based compound and/or an Al-based compound, and wherein the (meth)acrylic polymer coating layer contains at least one polar functional group selected from a carboxyl group and a hydroxy group in a content of 1-50 wt % in a (meth)acrylic polymer molecule, and wherein the (meth)acrylic polymer coating layer has a molecular weight (MW) of 5,000 to 500,000 g/mol.

2 . A method for manufacturing the quantum dot-polymer composite particles of claim 1 , the method comprising:
(i) preparing a polymer-containing solution in which a polymer is dissolved; (ii) adding and mixing quantum dots with the polymer-containing solution and then curing the mixture by addition of a polymer curing inducer; and (iii) separating a cured product from the polymer-containing solution and then drying the cured product, wherein the polymer curing inducer in step (ii) includes at least one of a Zn-based compound and an Al-based compound; and wherein in step (ii), the amount of the polymer curing inducer used is 2 to 30 parts by weight relative to the total weight of the polymer-containing solution, wherein the quantum dot comprises a surface treatment layer containing an organic halide, an inorganic halide, an inorganic oxyhalide, or a mixture thereof, and wherein the polymer curing inducer forms metal-ligand coordinate bonds with the at least one polar functional groups present in the (meth)acrylic polymer, thereby crosslinking and curing the polymer coating layer.

3 . The method of claim 2 , wherein the quantum dots in step (ii) comprise at least one surface treatment layer of at least one of a halide and an oxyhalide and are obtained by performing steps (a) to (c) below:
(a) mixing quantum dots, a solvent, and a non-solvent, followed by separation, thereby preparing a first solution in which the quantum dots are dispersed; (b) preparing a second solution in which at least one of a halide and an oxyhalide is dissolved; and (c) mixing and stirring the first solution and the second solution, followed by precipitation, thereby obtaining quantum dots with a surface treatment layer formed thereon and an organic ligand removed therefrom.

4 . The method of claim 3 , wherein in step (a), 100 to 1,000,000 parts by weight of thermally conductive inorganic particles relative to 100 parts by weight of the quantum dots are added and mixed.

Assignees

• Hansol Chemical Co Ltd

Inventors

• Noh Jaehong
• Yoon Gyucheol
• Gil Kyeonghun
• Kim Kyungnam
• Ha Sungmin
• Nam Chunrae

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• C08J3/20

  Compounding polymers with additives, e.g. colouring · CPC title