Shoei Chemical Inc.

Yuko Mitsuka

Hirokazu Sasaki

Makoto Kido

Takafumi Moriyama

Keisuke Matsuura

Naoki Sakura

Naoki Umeda

A method of producing core/shell semiconductor nanoparticles, the method comprising a shell formation step of adding a solution of group VI element precursor while adding a solution of zinc branched chain carboxylate to a core particle-dispersed solution to allow the zinc branched chain carboxylate to react with the group VI element precursor in presence of the core particles for forming a shell containing zinc and the group VI element on surfaces of the core particles. The present invention can provide a simple semiconductor nanoparticle production method of producing core/shell semiconductor nanoparticles with excellent optical properties when two or more types of the shell precursors are used to produce the core/shell semiconductor nanoparticles.

Method of producing core/shell semiconductor nanoparticles

Provided is a semiconductor nanoparticle complex dispersion liquid in which semiconductor nanoparticles are dispersed in a polar dispersion medium at a high mass fraction, and in which high fluorescence quantum efficiency (QY) is maintained. A semiconductor nanoparticle complex dispersion liquid according to an embodiment includes a semiconductor nanoparticle complex dispersed in an organic dispersion medium, wherein: the semiconductor nanoparticle complex is composed of two or more ligands including an aliphatic thiol ligand and a polar ligand, and a semiconductor nanoparticle with the ligands coordinated to the surface thereof; the ligands are composed of an organic group and a coordinating group; the organic group of the polar ligand includes a hydrophilic functional group; and an SP value of the organic dispersion medium is 8.5 or more.

Semiconductor nanoparticle complex dispersion liquid, semiconductor nanoparticle complex, semiconductor nanoparticle complex composition and semiconductor nanoparticle complex cured membrane

A semiconductor nanoparticle aggregate that is an aggregate of core/shell type semiconductor nanoparticles including a core including In and P and a shell having one or more layers, in which a peak wavelength of an emission spectrum of the semiconductor nanoparticle aggregate is from 605 nm to 655 nm and a full width at half maximum of the emission spectrum is 43 nm or less. For each semiconductor nanoparticle, (1) an average value of a full width at half maximum of an emission spectrum is 28 nm or less, (2) a standard deviation of a peak wavelength of the emission spectrum is 10 nm or more and 30 nm or less, and (3) a standard deviation of the full width at half maximum of the emission spectrum is 12 nm or less.

Semiconductor nanoparticle aggregate, semiconductor nanoparticle aggregate dispersion liquid, semiconductor nanoparticle aggregate composition, and semiconductor nanoparticle aggregate cured film

A semiconductor nanoparticle complex in which two or more ligands including an aliphatic ligand and a polar ligand are coordinated to a surface of a semiconductor nanoparticle, wherein: the ligands are composed of an organic group and a coordinating group; in the aliphatic ligand, the organic group is an aliphatic hydrocarbon group; the polar ligand includes a hydrophilic functional group in the organic group; a mass ratio of the aliphatic ligand to the polar ligand (aliphatic ligand/polar ligand) is 0.05 to 1.00; a ratio ({(X)/L}×100) of a mass reduction rate of the semiconductor nanoparticle complex in a range of 350° C. or higher and 550° C. or lower in a thermogravimetric analysis (X) to a mass fraction of all ligands in the semiconductor nanoparticle complex at room temperature (L) is 10 or more and 55 or less.

Semiconductor nanoparticle complex

The purpose of the present invention to provide semiconductor nanoparticles substantially containing no Cd, and which have an increased absorption coefficient to blue light while maintaining high stability. Semiconductor nanoparticles having a core containing at least In and P, and a shell having one or more layers, wherein at least one layer of the shell is ZnSeTe (wherein Te/(Se+Te)=0.03 to 0.50); and the semiconductor nanoparticles cause, when the semiconductor nanoparticles are dispersed in a dispersion medium to yield a dispersion liquid with a concentration of 1 mg/mL in inorganic mass, the dispersion liquid to have an absorbance of 0.9 or higher with respect to light having a wavelength of 450 nm at an optical path length of 1 cm.

Semiconductor nanoparticles comprising ZnSTe shell layer

The purpose of the present invention to provide a wavelength conversion layer containing semiconductor nanoparticles substantially containing no Cd, and which have an increased absorption coefficient to blue light while maintaining high stability. A wavelength conversion layer containing semiconductor nanoparticles, wherein the wavelength conversion layer can convert light having a wavelength of 450 nm to light having a peak wavelength of 500 nm to 550 nm, or light having a peak wavelength of 600 nm to 660 nm; each of the semiconductor nanoparticles contained in the wavelength conversion layer has a core and a shell having one or more layers; the core contains In and P; and at least one layer of the shell is ZnXTe (wherein X represents Se or S, or both Se and S).

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Tosu, Japan

Yuko Mitsuka