METHOD FOR PRODUCING QUANTUM DOT, AND ORGANOPHOSPHINE

• US 20190315623A1
• Filed: 11/02/2017
• Published: 10/17/2019
• Est. Priority Date: 11/07/2016
• Status: Abandoned Application

• Current Assignee: Shoei Chemical Inc.
• Original Assignee: Shoei Chemical Inc.
• Inventors: Moriyama, Takafumi, Novet, Thomas E., Schut, David M.
• Application Number:
  US16/347,663
• Publication Number:
  US 20190315623A1
• Time in Patent Office: Days
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 25/082 of boron, aluminium, gallium or indium
• CPC Class Codes: C01B 25/087 of gallium or indium
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C07F 9/24 Esteramides
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/70 containing phosphorus
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: C09K 11/886 with rare earth metals

Abstract

The purpose of the present invention is to provide a method for producing a quantum dot having narrow particle-size distribution with high reproducibility even when an amino-substituted organophosphine precursor is used in synthesis of the quantum dot. The method for producing a quantum dot according to one aspect of the present invention includes the steps of: combining a Group IIIB precursor and an organophosphine precursor with each other to form a precursor mixture, and heating the precursor mixture to form a solution of a Group IIIB phosphide quantum dot, wherein the organophosphine precursor comprises one or more amino sub stituents, and at least one parent amine of the one or more amino sub stituents has a boiling point of 160 ° C. or higher at standard atmospheric pressure.

Claims

1. A method for producing a quantum dot, comprising the steps of:

combining a Group IIIB precursor and an organophosphine precursor with each other to form a precursor mixture; and

heating the precursor mixture to form a solution of a Group IIIB phosphide quantum dot, wherein

the organophosphine precursor comprises one or more amino sub stituents, and

at least one parent amine of the one or more amino substituents has a boiling point of 160°

C. or higher at standard atmospheric pressure.

2. The method according to claim 1, wherein

in the step of heating the precursor mixture to form the solution of the Group IIIB phosphide quantum dot, the precursor mixture is caused to flow through a heated flow path to heat the precursor mixture.

3. The method according to claim 2, wherein

flow of the precursor mixture comprises flow of a plurality of divided liquid segments separated by gaseous partitions.

4. The method according to claim 1, wherein

the organophosphine precursor comprises three amino sub stituents, and a parent amine of at least one of the three amino substituents has a boiling point of 160°

C. or higher at standard atmospheric pressure.

5. The method according to claim 1, wherein

the organophosphine precursor comprises three amino sub stituents, and two or three parent amines of the three amino substituents are identical to each other.

6. The method according to claim 1, wherein

the one or more amino substituents are secondary amino substituents.

7. The method according to claim 1, wherein

the one or more amino sub stituents are N(n-octyl)₂.

8. The method according to claim 1, wherein

the one or more amino substituents are N(2-ethyl-n-hexyl)₂.

9. The method according to claim 1, wherein

the organophosphine precursor is soluble in oleylamine heated at 160°

C. or higher.

10. The method according to claim 1, wherein

the Group IIIB precursor comprises an indium precursor.

11. The method according to claim 1, wherein

combining the Group III precursor and the organophosphine precursor comprises combining the Group III precursor and the organophosphine precursor in an amine solvent that boils at 160°

C. or higher at standard atmospheric pressure.

12. The method according to claim 1, wherein

the quantum dot has a particle diameter of 2 to 15 nm.

13. The method according to claim 1, wherein

the quantum dot has an emission peak wavelength of 500 nm or more.

14. The method according to claim 1, wherein

the quantum dot has an emission peak wavelength of 580 nm or more.

15. The method according to claim 1, further comprising, before combining the Group III precursor and the organophosphine precursor with each other to form the precursor mixture,

combining a phosphorous starting material and a parent amine to form an organophosphine precursor having one or more amino substituents derived from the parent amine.

16. The method according to claim 15, wherein

the phosphorous starting material comprises at least one of phosphorous trichloride or phosphorous tribromide.

17. The method according to claim 15, wherein

the phosphorous starting material comprises organophosphine having a low-boiling-point amino sub stituent.

18. The method according to claim 15, wherein

the phosphorous starting material comprises at least one selected from a group consisting of tris(dimethylamino)phosphine (P(DMA)₃), tris(diethylamino)phosphine (P(DEA)₃), tris(dipropylamino)phosphine (P(DPA)₃), and tris(dibutylamino)phosphine (P(DBA)₃).

19. The method according to claim 15, wherein

combining the phosphorous starting material and the parent amine comprises heating and causing a volatile by-product to discharge.

20. An organophosphine comprising three amino substituents each derived from a secondary parent amine by cleavage of a nitrogen-hydrogen bond, wherein

the secondary parent amine has a boiling point of 160°

C. or higher at standard atmospheric pressure.

21. The organophosphine according to claim 20, wherein the three amino sub stituents are N(n-octyl)₂.

22. The organophosphine according to claim 20, wherein the three amino substituents are N(2-ethyl-n-hexyl)2.

23. The organophosphine according to claim 20, wherein an organophosphine precursor is soluble in oleylamine heated at 160°

C. or higher.