Films comprising bright silver based quaternary nanostructures

Patent metadata

Field	Value
Publication number	US-11407940-B2
Application number	US-202117166788-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Dec 22, 2020
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

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. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm.

First claim

What is claimed is:

1. A film comprising Ag, In, Ga, and S (AIGS) nanostructures, at least one ligand, and exhibiting a photon conversion efficiency (PCE) of greater than 32% at a peak emission wavelength of 480-545 nm, when excited using a blue light source with a wavelength of about 450 nm, wherein the nanostructures have an emission spectrum with a full width half maximum (FWHM) of less than 40 nm, and wherein the average diameter of the nanostructures is less than 10 nm by TEM.

2. The film of claim 1 , wherein the nanostructures have an emission spectrum with a FWHM of 24-38 nm.

3. The film of claim 1 , wherein the nanostructures have an emission spectrum with a FWHM of 27-32 nm.

4. The film of claim 1 , wherein the nanostructures have a quantum yield (QY) of 85-95%.

5. The film of claim 1 , wherein the nanostructures have a QY of about 86-94%.

6. The film of claim 1 , wherein the nanostructures have an OD 450 /mass greater than or equal to 0.8 mL·mg −1 ·cm −1 , where OD 450 is the optical density of the film when irradiated with electromagnetic energy having of wavelength of 450 nm.

7. The film of claim 6 , wherein the nanostructures have an OD 450 /mass in the inclusive range 0.8-2.5 mL·mg −1 ·cm −1 .

8. The film of claim 7 , wherein the nanostructures have an OD 450 /mass in the inclusive range 0.87-1.9 mL·mg −1 ·cm −1 .

9. The film of claim 1 , wherein the average diameter is about 5 nm.

10. The film of claim 1 , wherein at least about 80% of the emission is band-edge emission.

11. The film of claim 1 , wherein at least about 90% of the emission is band-edge emission.

12. The film of claim 11 , wherein 92-98% of the emission is band-edge emission.

13. The film of claim 11 , wherein 93-96% of the emission is band-edge emission.

14. The film of claim 1 , wherein the at least one ligand is a polyamino ligand.

15. The film of claim 14 , 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.

16. The film of claim 14 , wherein the polyamino-ligand is a C 2-20 alkane or C 2-20 cycloalkane substituted by two or three amino groups and optionally containing one or two amino groups in place of a carbon group.

17. The film of claim 16 , wherein the polyamino-ligand is 1,3-cyclohexanebis(methylamine), 2,2-dimethyl-1,3-propanediamine, tris(2-aminoethyl)amine, or 2-methyl-1,5-diaminopentane.

18. The film 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 C 1-20 alkyl.

19. The film of claim 18 , wherein x=19, y=3, and R 2 ═—CH 3 .

20. The film 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.

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

22. The film of claim 1 , further comprising at least one organic resin.

23. The film composition of claim 22 , wherein the at least one organic resin is cured.

24. The film composition of claim 1 , wherein the film is 5-15 μm thick.

25. The film composition of claim 1 , further comprising at least one monomer incorporated into the at least one ligand coating the AIGS nanostructures surface.

26. The film composition of claim 25 , wherein the at least one monomer is an acrylate.

27. The film composition of claim 26 , wherein the monomer is at least one of ethyl acrylate, hexanediol diacrylate (HDDA), tetrahydrofurfuryl acrylate, tri(propylene glycol) diacrylate, 1,4-bis(acryloyloxy)butane or isobornyl acrylate.

28. The film composition of claim 1 , which exhibits a blue light absorption at about 450 nm of greater than 95%.

29. The film composition of claim 1 , wherein the film is encapsulated between first and second barrier layers.

30. The film composition of claim 29 , wherein the PCE of the film is greater than 32% to 39%.

Assignees

• Nanosys Inc

Inventors

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

Classifications

• 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

• G02B1/002

  made of materials engineered to provide properties not available in nature, e.g. metamaterials · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title