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

Patent metadata

Field	Value
Publication number	US-11459243-B2
Application number	US-201916731383-A
Country	US
Kind code	B2
Filing date	Dec 31, 2019
Priority date	Aug 24, 2017
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

Provided are a core shell particle including a core which contains a Group III element and a Group V element, and a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element, in which the core shell particle has a tetrahedral shape having one side with a length of 6 nm or greater; a method of producing the core shell particle; and a film formed of the core shell particle.

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; and
a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element,
wherein the core shell particle has a tetrahedral shape having one side with a length of 6 nm or greater,
wherein an emission wavelength peak of the core shell particle is at 640 nm or greater, and
wherein the core shell particle has a luminous efficacy of 50% or greater.

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

3. The core shell particle according to claim 1 ,
wherein the Group III element is In, and
the Group V element is P.

4. The core shell particle according to claim 1 ,
wherein the Group II element is Zn, and
the Group VI element is S or Se.

5. The core shell particle according to claim 1 ,
wherein the Group II element is Zn, and
the Group VI element is S.

6. A method of producing a core shell particle, comprising:
a first step of mixing a Group III raw material containing a Group III element with a Group II raw material containing a Group II element to prepare a mixed solution containing the raw materials dissolved therein;
a second step of adding a Group V raw material containing a Group V element to the mixed solution to form a core containing the Group III element and the Group V element; and
a third step of adding a Group VI raw material containing a Group VI element to the mixed solution after the formation of the core to form a shell containing the Group II element and the Group VI element in at least a part of a surface of the core,
wherein the second step is a step of forming the core by adding the Group V raw material to the mixed solution at a temperature of 130° C. or lower and increasing the temperature to a temperature range of 200° C. to 240° C. at a temperature increase rate of 0.4° C./min or less.

7. The method of producing a core shell particle according to claim 6 ,
wherein the Group III element is In, and
the Group V element is any of P, N, or As.

8. The method of producing a core shell particle according to claim 6 ,
wherein the Group III element is In, and
the Group V element is P.

9. The method of producing a core shell particle according to claim 6 ,
wherein the Group II element is Zn, and
the Group VI element is S or Se.

10. The method of producing a core shell particle according to claim 6 ,
wherein the Group II element is Zn, and
the Group VI element is S.

11. The method of producing a core shell particle according to claim 6 ,
wherein the Group III raw material is a chloride of In.

12. The method of producing a core shell particle according to claim 6 ,
wherein the Group II raw material is a chloride of Zn.

13. The method of producing a core shell particle according to claim 6 ,
wherein the Group V raw material is trisdialkylaminophosphine.

14. The method of producing a core shell particle according to claim 6 ,
wherein the Group VI raw material is alkylthiol.

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

16. A film comprising:
the core shell particle according to claim 3 .

17. A film comprising:
the core shell particle according to claim 4 .

18. A film comprising:
the core shell particle according to claim 5 .

Assignees

• Fujifilm Corp

Inventors

• Isojima Hiroshi

Classifications

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• C09K11/56

  containing sulfur · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C01P2004/84

  one phase coated with the other · CPC title