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

Patent metadata

Field	Value
Publication number	US-10266764-B2
Application number	US-201715806773-A
Country	US
Kind code	B2
Filing date	Nov 8, 2017
Priority date	May 15, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

An object of the present invention is to provide core shell particle having high luminous efficacy and a narrow luminous half-width; a method of producing the same, and a film obtained by using core shell particles. 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. The molar ratio of the Group III element contained in the core to the Group V element contained in the entirety of the core shell particle, which is acquired from X-ray photoelectron spectroscopy analysis, is greater than 2.2.

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; and
a second shell which covers at least a part of the first shell,
wherein the molar ratio of the Group III element contained in the core to the Group V element contained in the entirety of the core shell particle, which is acquired using X-ray photoelectron spectroscopy analysis, is greater than 2.2.

2. The core shell particle according to claim 1 ,
wherein the molar ratio of the Group III element contained in the core to the group V element contained in the entirety of the core shell particle, which is acquired using X-ray photoelectron spectroscopy analysis is 2.5 to 5.0.

3. The core shell particle according to claim 1 ,
wherein the molar ratio of the Group III element contained in the core to the group V element contained in the entirety of the core shell particle, which is acquired using X-ray photoelectron spectroscopy analysis is 3.0 to 5.0.

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, and 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,
where, in a case where the first shell contains a Group III element, the Group III element contained in the first shell is a Group III element 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,
where, 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 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 are respectively 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 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; and
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 and by forming the second shell,
wherein the molar ratio of the Group V raw material added in the second step to the Group III raw material added in the first step is smaller than 0.5.

17. The method of producing a core shell particle according to claim 16 ,
wherein the molar ratio of the Group V raw material added in the second step to the Group III raw material added in the first step is smaller than 0.4.

18. The method of producing a core shell particle according to claim 16 ,
wherein the Group III raw material is a compound containing In.

19. The method of producing a core shell particle according to claim 16 ,
wherein the Group V raw material is a compound containing P.

20. The method of producing a core shell particle according to claim 16 ,
wherein the raw material of the first shell is a compound containing Ga.

21. The method of producing a core shell particle according to claim 20 ,
wherein the raw material of the first shell is a chloride of Ga.

22. The method of producing a core shell particle according to claim 16 ,
wherein the raw material of the second shell is a compound containing Zn.

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

Assignees

• Fujifilm Corp

Inventors

• Ono Masashi

Classifications

• Y10S977/95

  Electromagnetic energy · CPC title

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• Y10S977/896

  Chemical synthesis, e.g. chemical bonding or breaking · CPC title

• Y10S977/818

  III-P based compounds, e.g. AlxGayIn2P · CPC title

• C01B25/08

  Other phosphides · CPC title