# US 2021/0340440 A1 · Quantum dot

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- Number: US 2021/0340440 A1
- Document ID: US20210340440A1
- Status: Published application
- Kind: A1
- Application number: 16/937,333
- Filed: 2020-07-23
- Published: 2021-11-04
- Earliest claimed: 2020-05-04
- Assignees: National Tsing Hua University
- Applicants: National Tsing Hua University
- Inventors: Hsueh-Shih CHEN; Chang-Wei YEH
- Web page: https://patentgrep.com/patent/US20210340440A1

## CPC

- C09K 11/06: containing organic luminescent materials
- C09K 11/565: {with zinc cadmium}
- C09K 11/883: {with zinc or cadmium}
- 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
- C09K 2211/188: of other metals not provided for in one of the previous groups
- 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

## Abstract

A quantum dot is represented by Zn0.5-xCdxS0.5-ySey and has a size ranging from 7 nm to 20 nm, wherein 0<x<0.2, 0.005≤y<0.2, and Zn, Cd, S, and Se are non-uniformly distributed therein.

## Claims

### Claim 1

A quantum dot, represented by Zn0.5-xCdxS0.5-ySey and having a size ranging from 7 nm to 20 nm;
wherein 0<x<0.2 and 0.005≤y<0.2; and
wherein Zn, Cd, S, and Se are non-uniformly distributed in said quantum dot.

### Claim 2 (depends on 1)

The quantum dot of claim 1, wherein 0.02<x<0.18.

### Claim 3 (depends on 1)

The quantum dot of claim 1, wherein 0.005≤y<0.05.

### Claim 4 (depends on 1)

The quantum dot of claim 1, which has a quantum yield ranging from 30% to 90%.

### Claim 5 (depends on 1)

The quantum dot of claim 1, including a ZnS-based dot body that contains Cd and Se.

### Claim 6 (depends on 5)

The quantum dot of claim 5, which has a core-shell structure, and including said ZnS-based dot body serving as a core, and a ZnS shell layer surrounding said ZnS-based dot body.

### Claim 7 (depends on 5)

The quantum dot of claim 5, wherein y ranges from 0.008 to 0.043.

### Claim 8 (depends on 6)

The quantum dot of claim 6, wherein y ranges from 0.005 to 0.037.