Nanocrystal polymer composites and production methods thereof
A semiconductor nanocrystal composition including a semiconductor nanocrystal, an organic additive, and at least one polymerizable substance selected from a polymerizable monomer, a polymerizable oligomer, and a combination thereof, wherein the composition has haze of greater than or equal to about 40% after polymerization.
1. A semiconductor nanocrystal composition comprising:
a semiconductor nanocrystal,
an organic additive, and
at least one polymerizable substance selected from a polymerizable monomer, a polymerizable oligomer, and a combination thereof,
wherein the organic additive comprises a primary amine having one C8 to C30 alkyl or alkenyl group, a secondary amine having two C8 to C30 alkyl or alkenyl groups, a tertiary amine having three C8 to C30 alkyl or alkenyl groups, a primary phosphine having one C8 to C30 alkyl or alkenyl group, a secondary phosphine having two C8 to C30 alkyl or alkenyl groups, a tertiary phosphine having three C8 to C30 alkyl or alkenyl groups, a primary phosphine oxide having one C8 to C30 alkyl or alkenyl group, a secondary phosphine oxide having two C8 to C30 alkyl or alkenyl groups, a tertiary phosphine oxide having three C8 to C30 alkyl or alkenyl groups, and
wherein the composition has a haze of greater than or equal to 40% after polymerization.
2. The semiconductor nanocrystal composition of claim 1 , wherein the polymerizable substance comprises a polymerizable monomer and a polymerizable oligomer.
3. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal comprises a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV element or compound, or a combination thereof.
4. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal has a core-shell structure.
5. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal has a photoluminescence quantum yield of greater than or equal to 50%.
6. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal has a full width at half maximum of less than or equal to 45 nanometers.
7. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal comprises a surface organic compound,
wherein an amount of the organic compound is less than or equal to 35% by weight based on the total weight of the semiconductor nanocrystal, and
wherein the surface organic compound comprises a ligand compound, a solvent, or a combination thereof.
8. The semiconductor nanocrystal composition of claim 1 , wherein the composition has a haze of 45% to 95% after polymerization.
9. The semiconductor nanocrystal composition of claim 1 , wherein an amount of the organic additive is 0.05% by weight to 10% by weight based on the total weight of the polymerizable substance.
10. The semiconductor nanocrystal composition of claim 1 ,
wherein the polymerizable monomer comprises a combination of a first monomer comprising at least two thiol groups, each located at its terminal ends and a second monomer comprising at least two carbon-carbon unsaturated bonds each located at its terminal ends, an acrylate monomer, a methacrylate monomer, a urethane (meth)acrylate monomer, an epoxy monomer, a silicone monomer, or a combination thereof, and
wherein the polymerizable oligomer comprises an acrylate oligomer, a methacrylate oligomer, a urethane acrylate oligomer, an epoxy oligomer, a silicone oligomer, or a combination thereof.
11. The semiconductor nanocrystal composition of claim 1 , wherein the semiconductor nanocrystal composition further comprises an inorganic oxide selected from silica, alumina, titania, zirconia, zinc oxide, and a combination thereof.
12. The semiconductor nanocrystal composition of claim 1 , wherein the organic additive comprises octyl amine, oleyl amine, hexadecyl amine, dioctyl amine, didecyl amine, dioctyl phosphine, trioctyl phosphine, dioctyl phosphine oxide, trioctyl phosphine oxide, or a combination thereof.
13. A semiconductor nanocrystal-polymer composite comprising:
a semiconductor nanocrystal,
an organic additive, and
a polymerization product of at least one polymerizable substance selected from a polymerizable monomer, a polymerizable oligomer, and a combination thereof,
wherein the organic additive comprises a primary amine having one C8 to C30 alkyl or alkenyl group, a secondary amine having two C8 to C30 alkyl or alkenyl groups, a tertiary amine having three C8 to C30 alkyl or alkenyl groups, a primary phosphine having one C8 to C30 alkyl or alkenyl group, a secondary phosphine having two C8 to C30 alkyl or alkenyl groups, a tertiary phosphine having three C8 to C30 alkyl or alkenyl groups, a primary phosphine oxide having one C8 to C30 alkyl or alkenyl group, a secondary phosphine oxide having two C8 to C30 alkyl or alkenyl groups, a tertiary phosphine oxide having three C8 to C30 alkyl or alkenyl groups, and
wherein the composite has a haze of greater than or equal to 40%.
14. The semiconductor nanocrystal-polymer composite of claim 13 , wherein the composite is in the form of a film.
15. The semiconductor nanocrystal-polymer composite of claim 13 , wherein the semiconductor nanocrystal comprises a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV element or compound, or a combination thereof.
16. The semiconductor nanocrystal-polymer composite of claim 13 , wherein the semiconductor nanocrystal emits a green light or a red light.
17. The semiconductor nanocrystal-polymer composite of claim 13 , further comprising an inorganic oxide selected from silica, alumina, titania, zirconia, zinc oxide, and a combination thereof.
18. The semiconductor nanocrystal-polymer composite of claim 13 , wherein composite has a haze of 45% to 95%.
19. The semiconductor nanocrystal-polymer composite of claim 13 , wherein an amount of the organic additive in the semiconductor nanocrystal composite is 0.05% by weight to 10% by weight based on the total weight of the polymerizable substance.
20. The semiconductor nanocrystal-polymer composite of claim 13 ,
wherein the polymerizable monomer comprises a combination of a first monomer comprising at least two thiol groups at its terminal ends and a second monomer having at least two carbon-carbon unsaturated bonds at its terminal ends, an acrylate monomer, a methacrylate monomer, a urethane (meth)acrylate monomer, an epoxy monomer, a silicone monomer, or a combination thereof, and
wherein the polymerizable oligomer comprises an acrylate oligomer, a methacrylate oligomer, a urethane (meth)acrylate oligomer, an epoxy oligomer, a silicone oligomer, or a combination thereof.
21. A backlight unit for a liquid crystal display, comprising:
a LED light source; and
a light conversion layer disposed separately from the LED light source to convert light emitted from the LED light source to white light and provide the white light to a liquid crystal panel,
wherein the light conversion layer comprises the semiconductor nanocrystal-polymer composite of claim 13 .
22. The backlight unit for a liquid crystal display of claim 21 , wherein the light conversion layer comprises:
the semiconductor nanocrystal-polymer composite film; and
at least one of a first polymer film and a second polymer film disposed on at least one surface of the nanocrystal-polymer composite film,
wherein the first polymer film and the second polymer film each independently comprises a polyester, a cyclic olefin polymer, a polymerization product of a first monomer comprising at least two thiol groups, each located at the terminal ends of the first monomer, and a second monomer comprising at least two unsaturated carbon-carbon bonds, each located at the terminal ends of the second monomer, or a combination thereof.
23. The backlight unit for a liquid crystal display of claim 22 , wherein at least one of the first polymer film and the second polymer film further comprises an inorganic oxide.
24. The backlight unit for a liquid crystal display of claim 22 , wherein at least one of the first polymer film and the second polymer film has an uneven surface pattern on a side opposite to the light conversion layer.
25. The semiconductor nanocrystal composition-polymer composite of claim 13 , wherein the organic additive comprises octyl amine, oleyl amine, hexadecyl amine, dioctyl amine, didecyl amine, dioctyl phosphine, trioctyl phosphine, dioctyl phosphine oxide, trioctyl phosphine oxide, or a combination thereof.