Stabilized quantum dot composite and method of making a stabilized quantum dot composite

Patent metadata

Field	Value
Publication number	US-10879433-B2
Application number	US-201916419261-A
Country	US
Kind code	B2
Filing date	May 22, 2019
Priority date	Nov 10, 2017
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A stabilized quantum dot composite includes a plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising an ionic metal oxide. A method of making a stabilized quantum dot composite includes forming a mixture comprising a plurality of luminescent semiconducting nanoparticles dispersed in an aqueous solution comprising an ionic metal oxide. The mixture is dried to form a stabilized quantum dot composite comprising the plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising the ionic metal oxide.

First claim

The invention claimed is:

1. A method of making a stabilized quantum dot composite, the method comprising:
forming a mixture including a plurality of luminescent semiconducting nanoparticles dispersed in an aqueous solution comprising an ionic metal oxide having a chemical formula nA x O y ·mB z O w , wherein A includes one or more elements selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, wherein B includes one or more elements selected from the group consisting of B, Al, Ga, In, Si, Ge, Sn, and Pb, wherein x, y, z, and w are positive integers, and wherein n and m are stoichiometry coefficients; and
drying the mixture, thereby forming a stabilized quantum dot composite comprising the plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising the ionic metal oxide.

2. The method of claim 1 , wherein x=2, y=1, z=1, and w=2, and the chemical formula is nA 2 O.mBO 2 .

3. The method of claim 1 , wherein A comprises K, wherein B comprises Si, and wherein the ionic metal oxide comprises potassium silicate.

4. The method of claim 3 , wherein the potassium silicate comprises nK 2 O.mSiO 2 in a molar ratio n:m from about 1:1.5 to about 1:4.5.

5. The method of claim 1 , wherein the luminescent semiconducting nanoparticles comprise a semiconductor selected from the group consisting of: group IV, group II-VI semiconductors, group III-V semiconductors, group I-III-VI2 semiconductors, and perovskite semiconductors.

6. The method of claim 5 , wherein an interior of each of the luminescent semiconducting nanoparticles comprises the semiconductor, and further comprising a buffer layer surrounding the interior.

7. The method of claim 6 , wherein the buffer layer comprises an oxide coating.

8. The method of claim 1 , wherein the stabilized quantum dot composite is optically transparent.

9. The method of claim 1 , wherein the mixture comprises a uniform dispersion of the luminescent semiconducting nanoparticles.

10. The method of claim 1 , wherein a centrifugal mixer is employed to form the mixture.

11. The method of claim 1 , wherein drying the mixture entails removing water from the aqueous solution at an elevated temperature up to about 500° C.

12. The method of claim 1 , wherein the mixture is formed and dried in air.

13. The method of claim 1 , wherein the mixture is formed and dried in an inert gas environment or a vacuum.

14. The method of claim 1 , wherein the stabilized quantum dot composite has a morphology selected from the group consisting of: macroscopic body, microparticles, and coating.

15. The method of claim 1 , wherein a macroscopic body comprising the stabilized quantum dot composite is formed upon drying, and
further comprising crushing the macroscopic body to form microparticles comprising the stabilized quantum dot composite.

16. The method of claim 1 , wherein the drying comprises spray drying to form microparticles comprising the stabilized quantum dot composite.

17. The method of claim 1 , further comprising, prior to drying, applying the mixture to a substrate,
wherein, upon drying, a coating comprising the stabilized quantum dot composite is formed on the substrate.

18. The method of claim 1 , further comprising, prior to drying, pouring the mixture into a mold,
wherein, upon drying, a molded body comprising the stabilized quantum dot composite is formed.

19. The method of claim 1 , further comprising, prior to drying, flowing the mixture through a nozzle and onto a substrate,
wherein, upon drying, a 3D printed object comprising the stabilized quantum dot composite is formed on the substrate.

20. A method of making a stabilized quantum dot composite, the method comprising:
forming a mixture including a plurality of luminescent semiconducting nanoparticles dispersed in an aqueous solution comprising an ionic metal oxide; and
drying the mixture, thereby forming a stabilized quantum dot composite comprising the plurality of luminescent semiconducting nanoparticles embedded in a matrix comprising the ionic metal oxide,
wherein the stabilized quantum dot composite has a form of a microparticle, a molded body, a 3D printed object, and/or a macroscopic body having a predetermined shape.

Assignees

• Cree Inc

Inventors

• Lotito Kenneth
• Gresback Ryan
• Griffiths Ceri
• Fini Paul

Classifications

• H10H20/8512 Primary

  Wavelength conversion materials · CPC title

• Y10S977/892

  Liquid phase deposition · CPC title

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title

• B82Y20/00

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

• Y10S977/95

  Electromagnetic energy · CPC title