# US 2023/0265342 A1 · Quantum dot material and method for producing quantum dot material

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- Number: US 2023/0265342 A1
- Document ID: US20230265342A1
- Status: Published application
- Kind: A1
- Application number: 18/304,919
- Filed: 2023-04-21
- Published: 2023-08-24
- Earliest claimed: 2016-04-26
- Assignees: Shoei Chemical Inc.
- Applicants: Shoei Chemical Inc.
- Inventors: Takafumi Moriyama; Aya Midorikawa
- Web page: https://patentgrep.com/patent/US20230265342A1

## CPC

- C09K 11/883: {with zinc or cadmium}
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/70: containing phosphorus
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- G01N 23/201: by measuring small-angle scattering
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

An object of the present invention is to provide a core/shell type quantum dot material capable of increasing the photoluminescence quantum yield and a method of manufacturing the same. The quantum dot material according to one embodiment of the present invention is a quantum dot material comprising a plurality of nanoscopic core-shell structures, each nanoscopic core-shell structure including a nanocrystalline core including phosphorus and indium, a shell disposed on the nanocrystalline core, and a modifier comprising at least one of chlorine and bromine, wherein the content of chlorine and/or bromine is within a range of 2 to 15 mass % of the quantum dot material.

## Claims

### Claim 1

A quantum dot material, comprising:
a plurality of nanoscopic core-shell structures, each nanoscopic core-shell structure including
a nanocrystalline core,
a shell disposed on the nanocrystalline core; and
a modifier comprising a halogen, wherein
the modifier is present on a surface of the nanocrystalline core and an exterior surface of the shell, and
the content of the halogen is within a range of 4 to 8 mass % of the quantum dot material.

### Claim 2 (depends on 1)

The quantum dot material according to claim 1, wherein the halogen comprises at least one of chlorine and bromine.

### Claim 3 (depends on 1)

The quantum dot material according to claim 1, wherein the nanocrystalline core comprises InP and the shell comprises ZnS.

### Claim 4 (depends on 1)

The quantum dot material according to claim 1, wherein the quantum dot material further includes an intermediate shell between the shell and the nanocrystalline core, and the intermediate shell includes ZnSe.

### Claim 5 (depends on 1)

The quantum dot material according to claim 1, wherein the quantum dot material comprises an inorganic material layer on the shell.

### Claim 6 (depends on 5)

The quantum dot material according to claim 5, wherein the inorganic material layer is one or more of Al2O3, SiO2, ZnO, TiO2, Y2O3, HfO2, or MgO.

### Claim 7 (depends on 1)

The quantum dot material according to claim 1, wherein a photoluminescence quantum yield (PLQY) of the quantum dot material is 80% or more.

### Claim 8 (depends on 1)

The quantum dot material according to claim 1 wherein a photoluminescence quantum yield (PLQY) of the quantum dot material after leaving the quantum dot material indoors for 10 days is 70% or more.

### Claim 9

A method for producing a quantum dot (QD) material, comprising:
adding a modifier containing a halogen to a solution containing a nanocrystalline core material,
modifier treating a surface of the nanocrystalline core material with the modifier to form a modifier-treated nanocrystalline core,
mixing an outer shell-forming metal complex and a chalcogen compound with a solution containing the modifier-treated nanocrystalline core material to form an outer shell on each modified nanocrystalline core material, and
modifier treating an exterior surface of the outer shell with the modifier added to the solution containing the nanocrystalline core material.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the halogen comprises one or more of chlorine and bromine.

### Claim 11 (depends on 9)

The method according to claim 9, further comprising, before forming the outer shell:
forming an intermediate shell on a surface of the modifier-treated nanocrystalline core material, and
modifier treating an exterior surface of the intermediate shell with the modifier added to the solution containing the nanocrystalline core material.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the modifier comprises one or more of a carboxylic acid chloride and/or a carboxylic acid bromide.

### Claim 13 (depends on 9)

The method according to claim 9, further comprising adjusting a molar ratio of the modifier such that a content of chlorine and/or bromine in the resultant quantum dot material is within a range of 2 to 15 mass %.

### Claim 14 (depends on 9)

The method according to claim 9, wherein the core-forming metal complex comprises a chelate of a group IIIA metal ion, and the outer shell-forming metal complex comprises a chelate of a group JIB metal ion.

### Claim 15 (depends on 9)

The method according to claim 9, wherein the core-forming metal complex comprises a chelate of trivalent indium.

### Claim 16 (depends on 9)

The method according to claim 9, wherein the outer shell-forming metal complex comprises a divalent zinc chelate.

### Claim 17 (depends on 9)

The method according to claim 9, wherein one or more of the core-forming metal complex and/or the outer shell-forming metal complex comprises a carboxylate complex.

### Claim 18 (depends on 9)

The method according to claim 9, wherein the modifier comprises a carboxylic acid chloride.

### Claim 19 (depends on 9)

The method according to claim 9, wherein the chalcogen compound comprises a thiol, a disulfide, or a selenol.