Films comprising bright silver based quaternary nanostructures

Patent metadata

Field	Value
Publication number	US-12258506-B2
Application number	US-202418598475-A
Country	US
Kind code	B2
Filing date	Mar 7, 2024
Priority date	Dec 22, 2020
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

Disclosed are films comprising Ag In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm when excited using a blue light source with a wavelength of about 450 nm.

First claim

What is claimed is:

1. Nanostructures comprising:
Ag, In, Ga, and S (AIGS); and
at least one ligand,
wherein the nanostructures comprise a gradient of more gallium at a surface of the nanostructures to less gallium in a center of the nanostructures;
wherein the nanostructures have a peak emission wavelength (PWL) between 480 and 545 nm;
wherein the nanostructures have an emission spectrum with a full width half maximum (FWHM) of less than 40 nm; and
wherein the nanostructures have an emission quantum yield (QY) of 80 to 99.9%.

2. The nanostructures of claim 1 , wherein the nanostructures have an OD 450 /mass (mL mg −1 ) greater than or equal to 0.8 mL·mg −1 ·cm −1 .

3. The nanostructures of claim 1 , wherein an average diameter of the nanostructures is less than 10 nm by transmission electron microscopy.

4. The nanostructures of claim 1 , wherein at least 80% of an emission from the nanostructures is band-edge emission.

5. The nanostructures of claim 1 , wherein a molar ratio of In to a total amount of In and Ga in the nanostructures is 0.12 to 0.24.

6. The nanostructures of claim 1 , wherein the nanostructures do not have differentiated shell structures.

7. The nanostructures of claim 1 , wherein the at least one ligand is a polyamino ligand.

8. The nanostructures of claim 7 , wherein the at least one polyamino ligand is a polyamino alkane, a polyamino-cycloalkane, a polyamino heterocyclic compound, a polyamino functionalized silicone, or a polyamino-substituted ethylene glycol.

9. The nanostructures of claim 7 , wherein the polyamino ligand comprises a C 2-20 alkane or C 2-20 cycloalkane substituted by two or three amino groups.

10. The nanostructures of claim 7 , wherein the polyamino ligand is 1,3-cyclohexanebis(methylamine), 2,2-dimethyl-1,3-propanediamine, tris(2-aminoethyl)amine, or 2-methyl-1-diaminopentane.

11. The nanostructures of claim 1 , wherein the at least one ligand is a compound of Formula I,

wherein x is 1 to 100, y is 0 to 100, and R 2 is a C 1-20 alkyl.

12. The nanostructures of claim 1 , wherein the at least one ligand is (3-aminopropyl)trimethoxysilane); (3-mercaptopropyl)triethoxysilane; DL-α-lipoic acid; 3,6-dioxa-1,8-octanedithiol; 6-mercapto-1-hexanol; methoxypolyethylene glycol amine; poly(ethyleneglycol) methyl ether thiol; diethyl phenylphosphonite; dibenzyl N,N-diisopropylphosphoramidite; di-tert-butyl N,N-diisopropylphosphoramidite; tris(2-carboxyethyl)phosphine hydrochloride; poly(ethylene glycol) methyl ether thiol; methoxypolyethylene glycol amine; acrylamide; or polyethylenimine.

13. The nanostructures of claim 1 , wherein the at least one ligand is a combination of aminopolyalkylene oxide and methoxypolyethylene glycol amine; amino-polyalkylene oxide and 6-mercapto-1-hexanol; aminopolyalkylene oxide and (3-mercaptopropyl)triethoxysilane; and 6-mercapto-1-hexanol and methoxypolyethylene glycol amine.

14. A method of preparing the nanostructures of claim 1 , the method comprising:
(a) preparing a mixture comprising AIGS cores, a gallium salt and a ligand in a solvent;
(b) maintaining the mixture to give ion-exchanged nanostructures with a gradient of gallium from a surface to a center of the nanostructures; and
(c) isolating the nanostructures.

15. The method of claim 14 , wherein the gallium salt is an oxygen-free Ga salt.

16. The method of claim 14 , wherein the gallium salt is a gallium halide.

17. The method of claim 14 , wherein the ligand is an oxygen-free ligand.

Assignees

• Shoei Chemical Ind Co

Inventors

• Tangirala Ravisubhash
• Yamanaga Jay
• Guo Wenzhou
• Sunderland Christopher
• Mamuye Ashenafi Damtew
• Wang Chunming
• Hwang Eunhee
• Kim Nahyoung

Classifications

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B82Y20/00

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