# US 10,483,440 B2 · Cadmium-free quantum dot nanoparticles

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- Number: US 10,483,440 B2
- Document ID: US10483440B2
- Status: Granted
- Kind: B2
- Application number: 15/725,768
- Filed: 2017-10-05
- Published: 2018-02-15
- Granted: 2019-11-19
- Earliest claimed: 2014-01-06
- Assignees: Nanoco Technologies Ltd.
- Applicants: Nanoco Technologies Ltd.
- Inventors: Paul Anthony Glarvey; James Harris; Steven Daniels; Nigel Pickett; Arun Narayanaswamy
- Web page: https://patentgrep.com/patent/US10483440B2

## CPC

- B01J 13/02: Making microcapsules or microballoons {(for medical preparations A61K9/50)}
- B22F 1/054: Nanosized particles
- B22F 1/16: Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10)
- B22F 9/24: starting from liquid metal compounds, e.g. solutions
- C01B 25/088: {containing plural metal}
- C09B 67/0097: {Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes}
- C09C 3/063: {Coating}
- C09K 11/62: containing gallium, indium or thallium
- C09K 11/623: {with zinc or cadmium}
- C09K 11/64: containing aluminium
- C09K 11/70: containing phosphorus
- C09K 11/71: also containing alkaline earth metals
- H10H 20/01: Manufacture or treatment
- H10H 20/8512: {Wavelength conversion materials}
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01P 2002/84: by UV- or VIS- data
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2006/40: Electric properties
- C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values
- H10H 20/0361: {of wavelength conversion means}
- Y10S 977/774: Exhibiting three-dimensional carrier confinement, e.g. quantum dots
- Y10S 977/892: Liquid phase deposition
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Quantum dot semiconductor nanoparticle compositions that incorporate ions such as zinc, aluminum, calcium, or magnesium into the quantum dot core have been found to be more stable to Ostwald ripening. A core-shell quantum dot may have a core of a semiconductor material that includes indium, magnesium, and phosphorus ions. Ions such as zinc, calcium, and/or aluminum may be included in addition to, or in place of, magnesium. The core may further include other ions, such as selenium, and/or sulfur. The core may be coated with one (or more) shells of semiconductor material. Example shell semiconductor materials include semiconductors containing zinc, sulfur, selenium, iron and/or oxygen ions.

## Claims

### Claim 1

A quantum dot nanoparticle comprising:
a core having an etched surface and comprising indium, phosphorus, magnesium, zinc, and sulfur;
a first shell disposed on the etched surface of the core; and
a second shell disposed on the first shell,
wherein the quantum dot nanoparticle emits light in the green region of the visible spectrum.

### Claim 2 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein the first shell is ZnS.

### Claim 3 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein there is a gradient of materials at a boundary between the core and the first shell.

### Claim 4 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein there is a gradient of materials at the boundary between the first shell and the second shell.

### Claim 5 (depends on 1)

The quantum dot nanoparticle of claim 1, further comprising at least one capping ligand.

### Claim 6 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein the second shell is ZnO.

### Claim 7 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein the quantum dot nanoparticle exhibits a quantum yield of at least 74%.

### Claim 8 (depends on 1)

The quantum dot nanoparticle of claim 1, wherein the emitted light has an emission maximum of 523 nm with a full-width at half-maximum (FWHM) of 57 nm.