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

Patent metadata

Field	Value
Publication number	US-10465111-B2
Application number	US-201916409883-A
Country	US
Kind code	B2
Filing date	May 13, 2019
Priority date	Nov 15, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

An object of the present invention is to provide a core shell particle having high luminous efficacy and a narrow emission half-width; a method of producing the same; and a film formed of 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; a second shell which covers at least a part of the first shell; and a coordination molecule in at least a part of an outermost surface, in which at least oxygen is detected by X-ray photoelectron spectroscopy analysis, and a molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis, is 6.1 or less.

First claim

What is claimed is:

1. A core shell particle comprising:
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;
a second shell which covers at least a part of the first shell; and
a coordination molecule in at least a part of an outermost surface,
wherein at least oxygen is detected by X-ray photoelectron spectroscopy analysis, and
a molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis, is 6.1 or less.

2. The core shell particle according to claim 1 ,
wherein the molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis, is 5.4 or less.

3. The core shell particle according to claim 1 ,
wherein the molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis, is 4.6 or less.

4. 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, or As.

5. The core shell particle according to claim 4 ,
wherein the Group III element contained in the core is In, and
the Group V element contained in the core is P.

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

7. The core shell particle according to claim 6 ,
wherein the Group II element contained in the core is Zn.

8. The core shell particle according to claim 1 ,
wherein the first shell contains a Group II element or a Group III element,
wherein, in a case where the first shell contains the Group III element, the Group III element contained in the first shell is a Group III element which is different from the Group III element contained in the core.

9. 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,
wherein, in a case where the first shell is the Group III-V semiconductor, the Group III element contained in the Group III-V semiconductor is a Group III element which is different from the Group III element contained in the core.

10. The core shell particle according to claim 9 ,
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.

11. The core shell particle according to claim 9 ,
wherein the first shell is the Group III-V semiconductor,
the Group III element is Ga, and
the Group V element is P.

12. 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.

13. The core shell particle according to claim 12 ,
wherein the second shell is the Group II-VI semiconductor,
the Group II element is Zn, and
the Group VI element is S.

14. The core shell particle according to claim 1 ,
wherein the core, the first shell, and the second shell each have a crystal system having a zinc blende structure.

15. 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 1 band structure.

16. A method of producing a core shell particle for synthesizing the core shell particle according to claim 1 , 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 solution to which a Group V raw material containing a Group V element has been added to the solution after the first step;
a third step of growing the core in the solution after the second step;
a fourth step of forming a first shell by adding a raw material of the first shell to the solution after the third step; and
a fifth step of forming a second shell by adding a raw material of the second shell to the solution after the fourth step and synthesizing a core shell particle,
wherein the second step is performed in an argon gas atmosphere, the third step, the fourth step, and the fifth step are performed in an inert gas atmosphere, and the third step is a step of holding the state at a temperature of 150° C. or higher for 30 minutes or longer.

17. A method of producing a core shell particle for synthesizing the core shell particle according to claim 1 , 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 solution to which a Group V raw material containing a Group V element has been added to the solution after the first step;
a third step of growing the core in the solution after the second step;
a fourth step of forming a first shell by adding a raw material of the first shell to the solution after the third step; and
a fifth step of forming a second shell by adding a raw material of the second shell to the solution after the fourth step and synthesizing a core shell particle,
wherein each of the second step to the fifth step is performed in an inert gas atmosphere, and the third step is a step of holding the state at a temperature of 200° C. or higher for longer than 2 hours.

18. The method of producing a core shell particle according to claim 17 ,
wherein the holding time in the third step is 150 minutes or longer.

19. The method of producing a core shell particle according to claim 17 ,
wherein the holding time in the third step is 165 minutes or longer.

20. The method of producing a core shell particle according to claim 17 ,
wherein the holding time in the third step is 300 minutes or shorter.

21. The method of producing a core shell particle according to claim 17 ,
wherein the holding temperature in the third step is 250° C. or higher.

22. The method of producing a core shell particle according to claim 17 ,
wherein the holding temperature in the third step is 290° C. or lower.

23. A film comprising:
the core shell particle according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Ono Masashi
• Sasaki Tsutomu

Classifications

• C09K11/74

  containing arsenic, antimony or bismuth · CPC title

• C09K11/70

  containing phosphorus · CPC title

• C09K11/08

  containing inorganic luminescent materials · CPC title

• C01B25/08

  Other phosphides · CPC title

• B82Y30/00

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