Semiconductor nanoparticle complex, semiconductor nanoparticle complex dispersion liquid, semiconductor nanoparticle complex composition, and semiconductor nanoparticle complex cured film
Provided is a semiconductor nanoparticle complex in which two or more kinds of ligands including a ligand I and a ligand II are coordinated to a surface of a semiconductor nanoparticle. The ligands are each an organic ligand including an organic group and a coordinating group. The ligand I is a thiocarboxylic acid represented by the following general formula (1). The mole fraction of the ligand I in the ligands is 0.2 mol % to 35.0 mol %. General formula (1): HS—X—(COOH) n (1) (In general formula (1), X is a (n+1)-valent hydrocarbon group, and n is a natural number of 1 to 3.) The present disclosure provides a semiconductor nanoparticle complex dispersible at a high mass fraction in a dispersion medium having polarity while a high fluorescence quantum yield (QY) of the semiconductor nanoparticle is retained.
1 . A semiconductor nanoparticle complex dispersion liquid comprising a semiconductor nanoparticle complex dispersed in an organic dispersion medium, the semiconductor nanoparticle complex comprising two or more organic ligands including a ligand I coordinated to a surface of a semiconductor nanoparticle, wherein
an organic ligand of the two or more organic ligands is a ligand including an organic group and a coordinating group,
the ligand I is a thiocarboxylic acid represented by the following general formula (1),
a mole fraction of the ligand I in the two or more organic ligands is 0.20 mol % to 35.00 mol %, and
the organic dispersion medium is a polar organic dispersion medium,
general formula (1):
HS—X—(COOH) n (1)
where X is a (n+1)-valent hydrocarbon group, and n is a natural number of 1 to 3.
2 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the ligand I comprises one or more kinds selected from the group consisting of thioglycolic acid, mercaptopropionic acid, mercaptohexanoic acid, mercaptoundecanoic acid, and thiomalic acid.
3 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the ligand I comprises one or more kinds selected from the group consisting of thioglycolic acid, mercaptopropionic acid, and thiomalic acid.
4 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the ligand I has a molecular weight of 300 or less.
5 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the two or more organic ligands further includes a polar ligand II having an SP value of 9.0 or more.
6 . The semiconductor nanoparticle complex dispersion liquid according to claim 5 , wherein the polar ligand II has an SP value of 9.3 or more.
7 . The semiconductor nanoparticle complex dispersion liquid according to claim 5 , wherein the polar ligand II has a molecular weight that is greater than a molecular weight of the ligand I.
8 . The semiconductor nanoparticle complex dispersion liquid according to claim 5 , wherein the polar ligand II includes an organic group and a coordinating group, and wherein the coordinating group of the polar ligand II is a carboxyl group or a mercapto group.
9 . The semiconductor nanoparticle complex dispersion liquid according to claim 5 , wherein the polar ligand II includes an organic group and a coordinating group, and wherein the organic group of the polar ligand II includes an ether bond or an ester bond.
10 . The semiconductor nanoparticle complex dispersion liquid according to claim 5 , wherein the two or more organic ligands further includes an aliphatic ligand.
11 . The semiconductor nanoparticle complex dispersion liquid according to claim 10 , wherein the aliphatic ligand comprises one or more kinds selected from the group consisting of aliphatic thiols, aliphatic carboxylic acids, aliphatic amines, aliphatic phosphines, and aliphatic phosphine oxides.
12 . The semiconductor nanoparticle complex dispersion liquid according to claim 10 , wherein a molar ratio of the aliphatic ligand to the polar ligand II (aliphatic ligand/polar ligand II) is 0.10 to 5.00.
13 . The semiconductor nanoparticle complex dispersion liquid according to claim 10 , wherein a molar ratio of the aliphatic ligand to the polar ligand II (aliphatic ligand/polar ligand II) is 0.10 to 3.00.
14 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the semiconductor nanoparticle comprises a core-shell structure having a core and a shell covering at least part of the core, and wherein the shell comprises.
15 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein the semiconductor nanoparticle includes indium and phosphorus.
16 . The semiconductor nanoparticle complex dispersion liquid according to claim 1 , wherein a quantum yield of the semiconductor nanoparticle complex is 85% or higher.
17 . The semiconductor nanoparticle complex according to claim 1 , wherein a full width at half maximum of an emission spectrum of the semiconductor nanoparticle complex is 38 nm or less.
18 . A semiconductor nanoparticle complex composition comprising a semiconductor nanoparticle complex dispersed in a dispersion medium, wherein
the dispersion medium is a polar organic dispersion medium comprising a monomer or a prepolymer,
the semiconductor nanoparticle complex comprises two or more organic ligands including a ligand I coordinated to a surface of a semiconductor nanoparticle,
an organic ligand of the two or more organic ligands is a ligand including an organic group and a coordinating group,
the ligand I is a thiocarboxylic acid represented by the following general formula (1), and
a mole fraction of the ligand I in the two or more organic ligands is 0.20 mol % to 35.00 mol %,
general formula (1):
HS—X—(COOH) n (1)
where X is a (n+1)-valent hydrocarbon group, and n is a natural number of 1 to 3.