US 12,180,404 B2 · Light-emitting body, method for producing light-emitting body, and biological material labeling agent

Abstract

A dispersion that includes water and a light-emitting body dispersed in the water. The light-emitting body contains a nanoparticle of a AgInSe compound semiconductor, and a film to which hydrophilicity is imparted by ultrasonic irradiation on a surface of the nanoparticle. The film has a double structure having a first organic molecular film containing an alkylthiol and a second organic molecular film composed mainly of a fatty acid. The light-emitting body has an emission quantum yield of 10% or more, an emission intensity peak wavelength in the range of 650 to 1000 nm, and a half-width ΔH of 100 nm or less at the emission intensity peak wavelength.

Claims21

Dependent claims

A dispersion comprising:

water;
and
a light-emitting body dispersed in the water, the light-emitting body comprising:
a nanoparticle of a compound semiconductor containing at least a Ag component, an In component, and a Se component;
and
a film with hydrophilicity on a surface of the nanoparticle,
wherein the light-emitting body has an emission quantum yield of 10% or more and/or an emission intensity peak wavelength in a range of 650 to 1000 nm and a half-width of 100 nm or less at the emission intensity peak wavelength, the film has a double structure having a first organic molecular film containing at least an alkylthiol and a second organic molecular film composed mainly of a fatty acid with a plurality of alkyl groups and the hydrophilicity is imparted by ultrasonic irradiation.

4 more elements

A method for producing a dispersion, the method comprising:

preparing a nonpolar nanoparticle dispersion liquid in which nanoparticles of a compound semiconductor containing at least a Ag component, an In component, and a Se component are dispersed in a nonpolar solvent;
preparing a precursor dispersion liquid by adding organic molecules including at least an alkylthiol to the nonpolar nanoparticle dispersion liquid to form a first organic molecular film on a surface of each nanoparticle;
preparing a fatty acid aqueous solution in which a fatty acid with a plurality of alkyl groups is dissolved in water in the presence of an alkali;
mixing the precursor dispersion liquid and the fatty acid aqueous solution to prepare a phase-separated solution containing a nonpolar solvent phase and an aqueous phase;
applying ultrasonic waves to the phase-separated solution to form a film with hydrophilicity on a surface of each nanoparticle;
and
dispersing the nanoparticles in water to prepare an aqueous nanoparticle dispersion.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/507,055Filed 21 Oct 2021 · continuation

Priority

JP 2019-1045084 Jun 2019

Published

US 2022/0041929 A110 Feb 2022

Granted

31 Dec 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification20 codes

C01B 19/002
Selenium; Tellurium; Compounds thereof: compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not…
C09K 11/88
Containing inorganic luminescent materials: containing selenium, tellurium or unspecified chalcogen elements
C01G 15/006
Compounds of gallium, indium or thallium: compounds containing gallium, indium or thallium, with or without oxygen or hydrogen, and containing two…
C09K 11/025
Use of particular materials as binders, particle coatings or suspension media therefor: non-luminescent particle coatings or suspension media

Light-emitting body, method for producing light-emitting body, and biological material labeling agent

Life of this patent

Light-emitting body, method for producing light-emitting body, and biological material labeling agent

Life of this patent

Abstract

Claims21