Core shell particle, method of producing core shell particle, and film

Patent metadata

Field	Value
Publication number	US-11072872-B2
Application number	US-201815976382-A
Country	US
Kind code	B2
Filing date	May 10, 2018
Priority date	Nov 12, 2015
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

An object of the present invention is to provide a core shell particle having high luminous efficacy and excellent durability; a method of producing the same; and a film obtained by using the core shell particle. The core shell particle of the present invention includes: a core which contains a Group III element and a Group V element; a first shell which covers at least a part of a surface of the core; and a second shell which covers at least a part of the first shell, in which at least a part of a surface of the core shell particle contains a metal-containing organic compound containing a metal element and a hydrocarbon group.

First claim

What is claimed is:

1. A core shell particle comprising:
a core which contains a Group Hi element and a Group V element;
a first shell which covers at least a part of a surface of the core; and
a second shell which covers at least a part of the first shell,
wherein at least a part of a surface of the core shell particle contains a metal-containing organic compound containing a metal element and a hydrocarbon group,
wherein the metal-containing organic compound is a fatty acid metal salt, and
wherein a ratio of a peak intensity of a peak M which is present at 1500 cm −1 or greater and less than 1600 cm −1 to a peak intensity of a peak L which is present at 1400 cm −1 or greater and less than 1500 cm −1 measured by Fourier transform infrared spectroscopy is 0.85 to 0.95.

2. The core shell particle according to claim 1 , wherein the metal element is a Group 12 or Group 13 metal element in the periodic table.

3. The core shell particle according to claim 1 , wherein the metal element is indium or zinc.

4. The core shell particle according to claim 3 , wherein the metal element is zinc.

5. The core shell particle according to claim 1 ,
wherein the hydrocarbon group contained in the metal-containing organic compound is a hydrocarbon group having 11 to 20 carbon atoms.

6. The core shell particle according to claim 1 ,
wherein the hydrocarbon group contained in the metal-containing organic compound is a saturated hydrocarbon group.

7. The core shell particle according to claim 1 , wherein the Group III element contained in the core is In, and the Group V element contained in the core is any of P, N, and As.

8. The core shell particle according to claim 7 , wherein the Group III element contained in the core is In, and the Group V element contained in the core is P.

9. The core shell particle according to claim 1 , wherein the core further contains a Group II element.

10. The core shell particle according to claim 9 , wherein the Group II element contained in the core is Zn.

11. The core shell particle according to claim 1 ,
wherein the first shell contains a Group II element or a Group III element.

12. The core shell particle according to claim 1 ,
wherein the first shell is a Group II-VI semiconductor which contains a Group II element and a Group VI element or a Group III-V semiconductor which contains a Group III element and a Group V element.

13. The core shell particle according to claim 12 ,
wherein, in a case where the first shell is the Group II-VI semiconductor, the Group II element is Zn and the Group VI element is Se or S, and
in a case where the first shell is the Group III-V semiconductor, the Group III element is Ga and the Group V element is P.

14. The core shell particle according to claim 12 , wherein the first shell is the Group III-V semiconductor, the Group III element is Ga, and. the Group V element is P.

15. The core shell particle according to claim 1 ,
wherein the second shell is a Group II-VI semiconductor which contains a Group II element and a Group VI element or a Group III-V semiconductor which contains a Group III element and a Group V element.

16. The core shell particle according to claim 15 ,
wherein the second shell is the Group II-VI semiconductor,
the Group II element is Zn, and
the Group VI element is S.

17. The core shell particle according to claim 1 ,
wherein the core, the first shell, and the second shell respectively have a crystal system having a zinc blonde structure.

18. The core shell particle according to claim 1 ,
wherein, among the core, the first shell, and the second shell, a band gap of the core is the smallest, and the core and the first shell respectively have a type I band structure.

19. A method of producing a core shell particle for synthesizing the core shell particle according to claim I, the method comprising:
a first step of heating and stirring a solution obtained by adding a Group III raw material which contains a Group III element to a solvent containing coordination molecules;
a second step of forming a core by adding a Group V raw material which contains a Group V element to the solution after the first step;
a third step of forming a first shell by adding a raw material of the first shell to the solution after the second step;
a fourth step of synthesizing a core shell particle by adding a raw material of a second shell to the solution after the third step to form the second shell; and
a fifth step of adding a metal-containing organic compound which contains a metal element and a hydrocarbon group to the solution after the fourth step and heating the solution.

20. The method of producing a core shell particle according to claim 19 ,
wherein the raw material of the second shell added in the fourth step contains a Group II raw material containing a Group II element or a Group III raw material containing a Group III element, and
the amount of the metal-containing organic compound to be added in the fifth step is greater than that of the Group II raw material or the Group III raw material added in the fourth step by an amount of greater than 0.5 in terms of molar ratio.

21. The method of producing a core shell particle according to claim 19 ,
wherein the heating temperature in the fifth step is in a range of 120° C. to 220° C.

22. A film which contains the core shell particle according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Ono Masashi

Classifications

• C09K11/08 Primary

  containing inorganic luminescent materials · CPC title

• H10H20/821

  of the light-emitting regions, e.g. non-planar junctions · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title

• C09K11/883

  with zinc or cadmium · CPC title