Quantum dots, compositions or composites including the same, patternized layer, and display device including the same

Patent metadata

Field	Value
Publication number	US-11866630-B2
Application number	US-202218083722-A
Country	US
Kind code	B2
Filing date	Dec 19, 2022
Priority date	Nov 18, 2019
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A quantum dot including a core including a first semiconductor nanocrystal including a Group III-V compound; and a semiconductor nanocrystal shell disposed on the core, the semiconductor nanocrystal shell including zinc, tellurium, and selenium, wherein the quantum dot does not include cadmium, and the semiconductor nanocrystal shell has a mole ratio of tellurium to selenium of less than about 0.025:1, a composition including the quantum dot, a quantum dot-polymer composite, a patterned layer including the composite, and an electronic device including the patterned layer.

First claim

What is claimed is:

1. A quantum dot, comprising
a core comprising a first semiconductor nanocrystal comprising a Group III-V compound; and
a shell disposed on the core, the shell comprising a second semiconductor nanocrystal comprising zinc, tellurium, and selenium,
wherein the quantum dot does not comprise cadmium, and
wherein the quantum dot has a mole ratio of tellurium to selenium of greater than or equal to about 0.001:1 and less than about 0.025:1.

2. The quantum dot of claim 1 , wherein the quantum dot has a mole ratio of tellurium to selenium of greater than or equal to about 0.005:1 and less than or equal to about 0.024:1.

3. The quantum dot of claim 1 , wherein the quantum dot has a mole ratio of tellurium to selenium of greater than or equal to about 0.0105:1 and less than or equal to about 0.023:1.

4. The quantum dot of claim 1 , wherein the quantum dot has a mole ratio of tellurium to selenium of greater than or equal to about 0.011:1 and less than or equal to about 0.022:1.

5. The quantum dot of claim 1 , wherein the quantum dot has a mole ratio of tellurium to selenium of greater than or equal to about 0.015:1 and less than or equal to about 0.023:1.

6. The quantum dot of claim 1 , wherein the core comprises indium and phosphorus.

7. The quantum dot of claim 6 , wherein the core further comprises zinc.

8. The quantum dot of claim 6 , wherein the quantum dot has an emission peak wavelength in a range of about 500 nanometers to about 550 nanometers, and a mole ratio of tellurium to indium is greater than or equal to about 0.1:1.

9. The quantum dot of claim 6 , wherein the quantum dot has an emission peak wavelength in a range of about 500 nanometers to about 550 nanometers, and a mole ratio of tellurium to indium is greater than or equal to about 0.2:1.

10. The quantum dot of claim 6 , wherein the quantum dot has an emission peak wavelength in a range of about 500 nanometers to about 550 nanometers, and a mole ratio of tellurium to indium is greater than or equal to about 0.25:1.

11. The quantum dot of claim 10 , wherein a quantum efficiency of the quantum dot is greater than or equal to about 58% and a full width at half maximum of a photoluminescence emission peak of the quantum dot is less than or equal to about 45 nanometers.

12. The quantum dot of claim 6 , wherein the quantum dot has an emission peak wavelength in the range of about 600 nanometers to about 650 nanometers and a mole ratio of tellurium to indium is greater than or equal to about 0.01:1.

13. The quantum dot of claim 12 , wherein a quantum efficiency of the quantum dot is greater than or equal to about 70% and a full width at half maximum of a photoluminescence emission peak of the quantum dot is less than about 45 nanometers.

14. A composition comprising
a plurality of the quantum dots of claim 1 ,
a dispersing agent,
a polymerizable monomer comprising a carbon-carbon unsaturated bond, and
an initiator.

15. The composition of claim 14 , wherein the dispersing agent is a polymer comprising a carboxylic acid group, the polymer comprising
a copolymer of a monomer mixture comprising a first monomer comprising a carboxylic acid group and a carbon-carbon double bond, a second monomer comprising a carbon-carbon double bond and a hydrophobic moiety and not comprising a carboxylic acid group, and optionally a third monomer comprising a carbon-carbon double bond and a hydrophilic moiety and not comprising a carboxylic acid group;
a multiple aromatic ring-containing polymer having a backbone structure in which two aromatic rings are bound to a quaternary carbon atom that is a constituent atom of another cyclic moiety in the main chain and comprising a carboxylic acid group (—COOH); or
a combination thereof.

16. The composition of claim 14 , wherein the composition further comprises a multi-thiol compound comprising at least two thiol groups at a terminal end of the multi-thiol compound, metal oxide particulates, or a combination thereof.

17. A quantum dot-polymer composite comprising
a polymer matrix; and
a plurality of the quantum dots of claim 1 dispersed in the polymer matrix.

18. A patterned layer comprising
a repeating section configured to emit light in a predetermined wavelength,
wherein the repeating section comprises the quantum dot-polymer composite of claim 17 .

19. A display device comprising a light source and a light emitting element,
wherein the light emitting element comprises the patterned layer of claim 18 , and
wherein the light source is configured to provide the light emitting element with incident light.

20. A light emitting device comprising:
a first electrode,
a second electrode, and
a quantum dot layer disposed between the first electrode and the second electrode,
wherein the quantum dot layer comprises a plurality of the quantum dots of claim 1 .

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Taekhoon
• Jun Shin Ae
• Kim Yong Wook
• Kim Tae Gon
• Park Garam

Classifications

• C09K11/883 Primary

  with zinc or cadmium · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title

• H10K59/38

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

• B82Y20/00

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