Semiconductor nanoparticles, method of producing the semiconductor nanoparticles, and light-emitting device

Patent metadata

Field	Value
Publication number	US-12324284-B2
Application number	US-202418735999-A
Country	US
Kind code	B2
Filing date	Jun 6, 2024
Priority date	Feb 28, 2017
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

Semiconductor nanoparticles including Ag, In, Ga, and S are provided. In the semiconductor nanoparticles, a ratio of a number of Ga atoms to a total number of In and Ga atoms is 0.95 or less. The semiconductor nanoparticles emit light having an emission peak with a wavelength in a range of from 500 nm to less than 590 nm, and a half bandwidth of 70 nm or less, and have an average particle diameter of 10 nm or less.

First claim

What is claimed is:

1. First semiconductor nanoparticles, comprising:
silver (Ag), indium (In), gallium (Ga), and sulfur(S),
wherein the first semiconductor nanoparticles emit light having an emission peak with a wavelength in a range from 500 nm to less than 590 nm and a half bandwidth of 70 nm or less upon irradiation of the light.

2. The first semiconductor nanoparticles according to claim 1 , wherein a ratio of a number of Ga atoms to a total number of In and Ga atoms is from 0.2 to 0.9.

3. The first semiconductor nanoparticles according to claim 1 , wherein a ratio of a number of Ag atoms to a total number of Ag, In, and Ga atoms is from 0.05 to 0.55.

4. The first semiconductor nanoparticles according to claim 1 , wherein a ratio of a number of Ag atoms to a total number of Ag, In, and Ga atoms is from 0.3 to 0.55, and a ratio of a number of Ga atoms to a total number of In and Ga atoms is from 0.5 to 0.9.

5. The first semiconductor nanoparticles according to claim 1 , wherein a ratio of a number of Ag atoms to a total number of Ag, In, and Ga atoms is from 0.05 to 0.27, and a ratio of a number of Ga atoms to a total number of In and Ga atoms is from 0.25 to 0.75.

6. Second semiconductor nanoparticles, comprising:
the first semiconductor nanoparticles according to claim 1 ; and
a semiconductor material having a band gap energy greater than a band gap energy of the first semiconductor nanoparticles.

7. The second semiconductor nanoparticles according to claim 6 , wherein the semiconductor material contains a group 13 element in a periodic table of chemical elements and a group 16 element in the periodic table of chemical elements.

8. The second semiconductor nanoparticles according to claim 7 , wherein the semiconductor material contains at least Ga as the group 13 element.

9. The second semiconductor nanoparticles according to claim 8 , wherein the semiconductor material contains at least S as the group 16 element.

10. A light conversion member comprising the first semiconductor nanoparticles according to claim 1 .

11. The light conversion member according to claim 10 , further comprising at least one selected from a group consisting of another semiconductor nanoparticles other than the first semiconductor nanoparticles, an organic fluorescent material, and an inorganic fluorescent material.

12. The light conversion member according to claim 10 , wherein the light conversion member is a sheet or plate-like member.

13. A light-emitting device comprising:
the light conversion member according to claim 10 ; and
a semiconductor light-emitting element having a peak wavelength of from 400 nm to 490 nm.

14. A liquid crystal display comprising the light-emitting device according to claim 13 .

Assignees

• National Univ Corporation Tokai National Higher Education And Research System
• Univ Osaka
• Nichia Corp

Inventors

• Torimoto Tsukasa
• Kameyama Tatsuya
• Kishi Marino
• Miyamae Chie
• Kuwabata Susumu
• Uematsu Taro
• Oyamatsu Daisuke
• Niki Kenta

Classifications

• H10H20/8515

  not being in contact with the bodies · CPC title

• H10H20/812

  within the light-emitting regions, e.g. having quantum confinement structures · CPC title

• H10H20/01

  Manufacture or treatment · CPC title

• C09K11/62

  containing gallium, indium or thallium · CPC title

• C09K11/02 Primary

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