Polymerizable composition, wavelength conversion member, backlight unit, and liquid crystal display device

1. A polymerizable composition comprising:

quantum dots having surfaces coordinated with a ligand;

a polymerizable compound; and

a dispersant,

wherein the ligand is a molecule that includes a saturated hydrocarbon chain having 6 or more carbon atoms and a coordinating group,

a LogP value of the polymerizable compound is 3.0 or lower,

the dispersant has a nonpolar portion and a polar portion in a molecule, and

the nonpolar portion is at least one selected from the group consisting of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, and a saturated aliphatic ring having 6 or more carbon atoms, and

the dispersant is at least one selected from the group consisting of Compound A1, Compound A2, Compound A3, Compound A4, Compound B1, Compound C, and Compound D:

wherein, in Compound A1, A3, and A4 each of ma and na is a number in which ma:na is 5:5 to 9:1, and R 1 is at least one of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, or a saturated aliphatic ring having 6 or more carbon atoms;

wherein, in Compound A2, each of ma, na and pa is a number in which ma:(na+pa) is 5:5 to 9:1 and na:pa is 1:9 to 9:1, and R 1 is at least one of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, or a saturated aliphatic ring having 6 or more carbon atoms;

wherein in Compound B1 each R 1 is independently selected from a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, or a saturated aliphatic ring having 6 or more carbon atoms, and mb:nb is 5:5 to 9:1; and

wherein in Compound D, n:m is 1:5 to 1:20.

2. The polymerizable composition according to claim 1 ,

wherein the quantum dots are at least one kind of quantum dots selected from the group consisting of quantum dots having a center emission wavelength in a wavelength range of 600 nm to 680 nm, quantum dots having a center emission wavelength in a wavelength range of 520 nm to 560 nm, and quantum dots having a center emission wavelength in a wavelength range of 430 nm to 480 nm.

3. The polymerizable composition according to claim 1 ,

wherein the coordinating group is an amino group, a phosphine group, or a phosphine oxide group.

4. The polymerizable composition according to claim 1 ,

wherein the polar portion is at least one selected from the group consisting of an ammonium ion, an acid anhydride, a hydroxyl group, an amino group, a mercapto group, a carboxy group, an aldehyde group, a phosphate group, a sulfo group, a carbonyl group, an ether bond, an ester bond, an amide bond, and an ethylene oxide chain.

5. The polymerizable composition according to claim 1 ,

wherein the polymerizable compound is at least one selected from the group consisting of a compound having an epoxy group and a (meth)acrylate compound.

6. The polymerizable composition according to claim 5 ,

wherein the polymerizable compound is an alicyclic epoxy compound.

7. The polymerizable composition according to claim 5 ,

wherein the polymerizable compound is a monofunctional (meth)acrylate compound.

8. The polymerizable composition according to claim 1 , further comprising a photopolymerization initiator.

9. A wavelength conversion member comprising a wavelength conversion layer which is formed by curing the polymerizable composition, the polymerizable composition comprising:

quantum dots having surfaces coordinated with a ligand;

a polymerizable compound; and

a dispersant,

wherein the ligand is a molecule that includes a saturated hydrocarbon chain having 6 or more carbon atoms and a coordinating group,

a LogP value of the polymerizable compound is 3.0 or lower, and

the dispersant has a nonpolar portion and a polar portion in a molecule, and

the nonpolar portion is at least one selected from the group consisting of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, and a saturated aliphatic ring having 6 or more carbon atoms, and

the dispersant is at least one selected from the group consisting of Compound A1, Compound A2, Compound A3, Compound A4, Compound B1, Compound C, and Compound D:

wherein, in Compound A1, A3, and A4 each of ma and na is a number in which ma:na is 5:5 to 9:1, and R 1 is at least one of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, or a saturated aliphatic ring having 6 or more carbon atoms;

wherein, in Compound A2, each of ma, na and pa is a number in which ma:(na+pa) is 5:5 to 9:1 and na:pa is 1:9 to 9:1, and R 1 is at least one of a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring, or a saturated aliphatic ring having 6 or more carbon atoms;

wherein in Compound B1 each R 1 is independently selected from a saturated hydrocarbon chain having 6 or more carbon atoms, an aromatic ring having 6 or more carbon atoms, or a saturated aliphatic ring, and mb:nb is 5:5 to 9:1; and

wherein in Compound D, n:m is 1:5 to 1:20.

10. The wavelength conversion member according to claim 9 ,

wherein the wavelength conversion layer is formed by curing the polymerizable composition by light irradiation.

11. The wavelength conversion member according to claim 9 , further comprising a barrier film having an oxygen permeability of 1.00 cm 3 /(m 2 ·day·atm) or lower,

wherein at least one of two main surfaces of the wavelength conversion layer is in contact with the barrier film.

12. The wavelength conversion member according to claim 11 ,

wherein two barrier films having an oxygen permeability of 1.00 cm 3 /(m 2 ·day·atm) or lower are provided, and

the two main surfaces of the wavelength conversion layer are in contact with the two barrier films, respectively.

13. A backlight unit comprising at least the wavelength conversion member according to claim 9 and a light source.

14. A liquid crystal display device comprising at least the backlight unit according to claim 13 and a liquid crystal cell.