Quantum dot, composition including quantum dot, quantum dot composite, display panel, and electronic device including same

Patent metadata

Field	Value
Publication number	US-12540276-B2
Application number	US-202217903242-A
Country	US
Kind code	B2
Filing date	Sep 6, 2022
Priority date	Sep 13, 2021
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

A quantum dot including a core including a first semiconductor nanocrystal, and a shell disposed on the core, the shell including a second semiconductor nanocrystal, wherein the quantum dot includes a metal including indium and zinc, and a non-metal including phosphorus and sulfur, does not include cadmium, and has an optical density (OD) of about 0.4 to about 0.6 per 1 milligrams (mg) of the quantum dot for a wavelength of 450 nanometers (nm) and an emission peak wavelength of greater than or equal to about 500 nm and less than or equal to about 550 nm, and a volume of the core of greater than or equal to about 15% and less than or equal to about 50%, based on a total volume of the quantum dot.

First claim

What is claimed is:

1 . A quantum dot, comprising
a core comprising a first semiconductor nanocrystal, and a shell disposed on the core, the shell comprising a second semiconductor nanocrystal, wherein the quantum dot comprises a metal comprising indium and zinc, and a non-metal comprising phosphorus and sulfur, and does not comprise cadmium, and wherein the quantum dot has an optical density of about 0.4 to about 0.6 per 1 milligram of the quantum dot for a wavelength of 450 nanometers and an emission peak wavelength of greater than or equal to about 500 nanometers and less than or equal to about 550 nanometers, and a volume of the core is greater than or equal to about 20% and less than or equal to about 50%, based on a total volume of the quantum dot, wherein the first semiconductor nanocrystal comprises indium and phosphorus and the second semiconductor nanocrystal comprises zinc and sulfur, and wherein a molar ratio of the phosphorus to the sulfur in the quantum dot is about 1:1.0 to about 1:7.0.

2 . The quantum dot of claim 1 , wherein the volume of the core is greater than or equal to about 20% and less than or equal to about 35%, based on the total volume of the quantum dot.

3 . The quantum dot of claim 1 , wherein a molar ratio of phosphorus to sulfur in the quantum dot is about 1:2.0 to about 1:7.0.

4 . The quantum dot of claim 1 , wherein a molar ratio of indium to zinc in the quantum dot is about 1:3.0 to about 1:11.0.

5 . The quantum dot of claim 1 , wherein a molar ratio of indium to zinc in the quantum dot is about 1:5.0 to about 1:10.0.

6 . The quantum dot of claim 1 , wherein the first semiconductor nanocrystal further comprises gallium.

7 . The quantum dot of claim 6 , wherein the second semiconductor nanocrystal further comprises selenium.

8 . The quantum dot of claim 1 , wherein the second semiconductor nanocrystal further comprises selenium.

9 . The quantum dot of claim 1 , wherein the volume of the core is greater than or equal to about 21% and less than or equal to about 50%, based on the total volume of the quantum dot.

10 . The quantum dot of claim 1 , wherein the volume of the core is greater than or equal to about 21.3% and less than or equal to about 50%, based on the total volume of the quantum dot.

11 . A quantum dot composition, comprising
a plurality of quantum dots of claim 1 , and a polymerizable monomer, a dispersant, a solvent, or a combination thereof.

12 . The quantum dot composition of claim 11 , wherein the quantum dot composition comprises the polymerizable monomer and the polymerizable monomer comprises a polymerizable compound comprising a carbon-carbon double bond, a compound comprising a thiol group, or a combination thereof.

13 . The quantum dot composition of claim 11 , wherein the quantum dot composition comprises the dispersant and the dispersant comprises a compound or polymer comprising a carboxyl group.

14 . A quantum dot composite, comprising
a matrix, and a plurality of quantum dots dispersed in the matrix, wherein the plurality of quantum dots comprises the quantum dot of claim 1 .

15 . A display panel, comprising
a color conversion layer comprising a plurality of regions comprising a color conversion region, wherein the quantum dot composite of claim 14 is disposed in the color conversion region.

16 . The display panel of claim 15 , wherein
the display panel further comprises a light emitting panel comprising a light emitting source, the color conversion region comprises a first color conversion region configured to convert light emitted from the light emitting panel into light of a first emission spectrum, and the first color conversion region comprises the quantum dot composite.

17 . The display panel of claim 16 , wherein the color conversion region further comprises a second color conversion region configured to convert light emitted from the light emitting panel into light having a second emission spectrum different from the first emission spectrum.

18 . The display panel of claim 17 , wherein the first emission spectrum is a green emission spectrum having an emission peak wavelength of from about 500 nanometers to about 550 nanometers, and the second emission spectrum is a red emission spectrum having an emission peak wavelength of from about 600 nanometers to about 650 nanometers.

19 . An electronic device comprising the display panel of claim 15 .

20 . The electronic device of claim 19 , wherein the electronic device is a display device.

Assignees

• Samsung Electronics Co Ltd
• Samsung Display Co Ltd

Inventors

• Kim Minho
• Kim Tae Gon
• Jung Yebin
• Won Nayoun
• Jun Shin Ae

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• C09K11/883

  with zinc or cadmium · CPC title

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title