IP Library › Granted Patent US 12,187,942
Granted Patent B2
US 12,187,942 · App. 18/297,033 · Granted Jan 7, 2025

Cadmium free quantum dot including lithium, production method thereof, and electronic device including the same

Inventors: Yong Wook Kim (Yongin-si, KR); Eun Joo Jang (Suwon-si, KR); Hyo Sook Jang (Suwon-si, KR); Soo Kyung Kwon (Suwon-si, KR); Seon-Yeong Kim (Suwon-si, KR); Ji-Yeong Kim (Suwon-si, KR)
Assignee: SAMSUNG ELECTRONICS CO., LTD.
C09K11/883C09K11/025C09K11/0805C09K11/562C09K11/88G02B6/005G02F1/133617H10K59/12H10K59/38B82Y20/00B82Y40/00
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Quick Facts
Patent No.
US 12,187,942
App. No.
18/297,033
Granted
Jan 7, 2025
Kind
B2
Abstract

A cadmium free quantum dot includes zinc, tellurium, and selenium, and lithium. A full width at half maximum of a maximum luminescent peak of the cadmium free quantum dot is less than or equal to about 50 nanometers and the cadmium free quantum dot has a quantum efficiency of greater than 1%.

Claims (35)

1. A cadmium free quantum dot comprising:

zinc, tellurium, and selenium, and

lithium,

wherein the cadmium free quantum dot does not comprise an indium phosphide,

wherein the cadmium free quantum dot has a quantum efficiency of greater than or equal to about 5%, and wherein a mole ratio of tellurium to selenium (Te:Se) is greater than or equal to 1:1 and less than or equal to about 4:1.

2. The cadmium free quantum dot of claim 1 , wherein the cadmium free quantum dot comprises a semiconductor nanocrystal core comprising zinc, selenium, and tellurium and a shell disposed on the semiconductor nanocrystal core.

3. The cadmium free quantum dot of claim 1 , wherein a full width at half maximum of a maximum luminescent peak of the cadmium free quantum dot is less than or equal to 35 nanometers.

4. The cadmium free quantum dot of claim 2 , wherein the semiconductor nanocrystal core comprises ZnTe x Se 1-x , wherein x is greater than or equal to 0.5 and less than or equal to about 0.9.

5. The cadmium free quantum dot of claim 1 , wherein the amount of the lithium is greater than or equal to about 0.01 moles and less than or equal to about 1:1 with respect to 1 mole of tellurium.

6. The cadmium free quantum dot of claim 1 , wherein the mole ratio of tellurium with respect to selenium (Te:Se) is less than or equal to about 1.5:1.

7. The cadmium free quantum dot of claim 1 , wherein the mole ratio of tellurium with respect to zinc (Te:Zn) is greater than or equal to about 0.1:1 and less than or equal to about 0.85:1.

8. The cadmium free quantum dot of claim 1 , wherein the cadmium free quantum dot further comprises sulfur, and a mole ratio of the sulfur to zinc is greater than or equal to about 0.1:1 and less than or equal to about 0.6:1.

9. The cadmium free quantum dot of claim 1 , the maximum luminescent peak of the cadmium free quantum dot is present in a wavelength range of greater than or equal to 505 nanometers and less than or equal to about 560 nanometers.

10. The cadmium free quantum dot of claim 1 , wherein the quantum dot has a quantum efficiency of greater than or equal to about 10%.

11. The cadmium free quantum dot of claim 1 , wherein the quantum dot has a quantum efficiency of greater than or equal to about 18%.

12. A quantum dot polymer composite comprising

a polymer matrix; and

a plurality of quantum dots dispersed in the polymer matrix,

wherein the plurality of quantum dots comprises the cadmium free quantum dot of claim 1 .

13. A display device comprising

a light emitting element, and optionally a light source that is configured to provide incident light to the light emitting element,

wherein the light emitting element comprises a cadmium free quantum dot of claim 1 .

14. An electroluminescent device comprising an anode and a cathode, and a quantum dot emission layer disposed between the anode and the cathode, wherein the quantum dot emission layer comprises the quantum dot of claim 1 .

15. A cadmium free quantum dot comprising:

zinc, tellurium, and selenium, and

lithium,

wherein the cadmium free quantum dot has a quantum efficiency of greater than or equal to about 10%,

wherein the cadmium free quantum dot comprises

a core comprising a first semiconductor nanocrystal material and

a semiconductor nanocrystal shell disposed on the core,

wherein the core comprises ZnTe x Se 1-x , wherein x is greater than or equal to 0.5 and less than or equal to about 0.9, and the semiconductor nanocrystal shell comprises ZnSe, ZnS, ZnSeS, or a combination thereof.

16. A display device comprising

a light emitting element,

wherein the light emitting element comprises a cadmium free quantum dot of claim 15 .

17. An electroluminescent device comprising an anode and a cathode, and a quantum dot emission layer disposed between the anode and the cathode, wherein the quantum dot emission layer comprises the quantum dot of claim 15 .

Priority Claims (1)
KR 10-2019-0045758 · Apr 18, 2019 · national
Continuity (2)
Continuation 16851520 · Apr 17, 2020
Related Publication 20230250336A1 · Aug 10, 2023
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