Quantum dots and composite and display device including the same

Patent metadata

Field	Value
Publication number	US-12146090-B2
Application number	US-202318223709-A
Country	US
Kind code	B2
Filing date	Jul 19, 2023
Priority date	Nov 8, 2019
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A quantum dot-polymer composite including a polymer matrix; and core-shell quantum dots dispersed in the polymer matrix, wherein the core-shell quantum dots include a semiconductor nanocrystal core including indium, zinc, and phosphorus and a semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the shell including zinc, selenium, and sulfur. The core-shell quantum dots do not include cadmium, the core-shell quantum dots are configured to emit green light, the core-shell quantum dots have a mole ratio of phosphorus to indium of greater than or equal to about 0.75, and the core-shell quantum dots have a mole ratio of zinc to indium of greater than or equal to about 35, and a method of producing the core-shell quantum dots, and a display device including a light emitting element that includes the quantum dot-polymer composite.

First claim

What is claimed is:

1. An electronic device including a quantum dot, the quantum dot comprising indium, phosphorous, zinc, selenium, and sulfur, wherein the quantum dot has a mole ratio of phosphorus to indium of greater than or equal to 0.75:1 and less than or equal to 1.5:1, and the quantum dot has a mole ratio of zinc to indium of greater than or equal to 35:1 and less than or equal to 60:1, and
the quantum dot is configured to emit green light.

2. The electronic device of claim 1 , wherein in the quantum dot, the mole ratio of phosphorus to indium is greater than or equal to about 0.78:1 and less than or equal to about 1.2:1.

3. The electronic device of claim 1 , wherein in the quantum dot, the mole ratio of zinc to indium is greater than or equal to about 40:1 and less than or equal to about 55:1.

4. The electronic device of claim 1 , wherein in the quantum dot, the mole ratio of phosphorus to indium is greater than or equal to about 0.8:1 and less than or equal to about 1.1:1.

5. The electronic device of claim 1 , wherein in the quantum dot, the mole ratio of zinc to indium is greater than or equal to about 42:1 and less than or equal to about 52:1.

6. The electronic device of claim 1 , wherein in the quantum dot, a mole ratio of sulfur to selenium is greater than or equal to about 0.3:1 and less than or equal to about 1:1.

7. The electronic device of claim 1 , wherein in the quantum dot, a mole ratio of sulfur to selenium is greater than or equal to about 0.4:1 and less than or equal to about 0.65:1.

8. The electronic device of claim 1 , wherein the quantum dot has a mole ratio of a sum of sulfur and selenium to indium of greater than or equal to about 10:1 and less than or equal to about 45:1.

9. The electronic device of claim 1 , wherein the quantum dot has a mole ratio of a sum of sulfur and selenium to indium of greater than or equal to about 29:1 and less than or equal to about 43:1.

10. The electronic device of claim 1 , wherein the quantum dot has a size of greater than or equal to about 4 nanometers and less than or equal to about 8 nm.

11. The electronic device of claim 1 , wherein the quantum dot has a size of greater than or equal to about 5 nanometers and less than or equal to about 7 nm.

12. The electronic device of claim 10 , wherein the size of the quantum dot exhibits a standard deviation of less than or equal to about 17%.

13. The electronic device of claim 1 , wherein the quantum dot has a quantum efficiency of greater than or equal to about 90%.

14. An electronic device including a quantum dot, the quantum dot
comprising indium, phosphorous, zinc, selenium, and sulfur, wherein the quantum dot has a mole ratio of phosphorus to indium of greater than or equal to 0.75:1 and less than or equal to 1.5:1, and a mole ratio of zinc to indium of greater than or equal to 35:1 and less than or equal to 60:1, and
the quantum dot is configured to emit green light, wherein in a photoluminescence spectrum measured at 77K of the quantum dot, a ratio of a deep trap emission peak area to a total area of a maximum emission peak is less than or equal to about 4%.

15. The electronic device of claim 14 , wherein in the quantum dot, the mole ratio of phosphorus to indium is greater than or equal to about 0.78:1 and less than or equal to about 1.2:1 and the mole ratio of zinc to indium is greater than or equal to about 40:1 and less than or equal to about 55:1, and
wherein the quantum dot has a size of greater than or equal to about 4 nanometers and less than or equal to about 8 nm, and the size of the quantum dot exhibits a standard deviation of less than or equal to about 17%.

16. A patterned film including a section comprising a quantum dot composite, wherein the quantum dot composite comprises;
a polymer matrix and a quantum dot dispersed in the polymer matrix;
wherein the quantum dot comprises a first semiconductor nanocrystal comprising indium, zinc, and phosphorus, and a second semiconductor nanocrystal comprising zinc, selenium, and sulfur,
wherein in the quantum dot,
a mole ratio of phosphorus to indium is greater than or equal to 0.75:1 and less than or equal to 1.5:1, and
a mole ratio of zinc to indium is greater than or equal to 35:1 and less than or equal to 60:1.

17. The patterned film of claim 16 , wherein in the quantum dot, the mole ratio of phosphorus to indium is greater than or equal to about 0.78:1 and less than or equal to about 1.2:1 and the mole ratio of zinc to indium is greater than or equal to about 40:1 and less than or equal to about 55:1.

18. The patterned film of claim 17 , wherein in the quantum dot, the mole ratio of phosphorus to indium is greater than or equal to about 0.8:1 and less than or equal to about 1.1:1, and the mole ratio of zinc to indium is greater than or equal to about 42:1 and less than or equal to about 52:1.

19. A color filter comprising the patterned film of claim 16 .

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Taekhoon
• Won Nayoun
• Kim Tae Gon
• Lim Mi Hye
• Jun Shin Ae
• Park Shang Hyeun

Classifications

• H10K50/115

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C01B25/087

  of gallium or indium · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y15/00

  Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors · CPC title