Compositions and methods including depositing nanomaterial
View Patent ↗An ink composition comprising a nanomaterial and a liquid vehicle, wherein the liquid vehicle comprises a composition including one or more functional groups that are capable of being cross-linked is disclosed. An ink composition comprising a nanomaterial, a liquid vehicle, and scatterers is also disclosed. An ink composition comprising a nanomaterial and a liquid vehicle, wherein the liquid vehicle comprises a perfluorocompound is further disclosed. A method for inkjet printing an ink including nanomaterial and a liquid vehicle with a surface tension that is not greater than about 25 dyne/cm is disclosed. In certain preferred embodiments, the nanomaterial comprises semiconductor nanocrystals. Devices prepared from inks and methods of the invention are also described.
1. An ink composition comprising:
a light emissive nanomaterial comprising a plurality of quantum confined semiconductor nanocrystals capable of emitting light,
a plurality of scattering particles, and
a liquid vehicle,
wherein at least a portion of the scattering particles include a surface-treatment to improve dispersability and stability in the liquid vehicle.
2. An ink composition in accordance with claim 1 wherein the scattering particles comprise metal or metal oxide particles, air bubbles, solid glass beads, or hollow glass beads.
3. An ink composition in accordance with claim 1 wherein the scattering particles comprise TiO 2 , SiO 2 , BaTiO 3 , and ZnO.
4. An ink composition in accordance with claim 1 wherein at least a portion of the scattering particles have a spherical shape.
5. An ink composition in accordance with claim 1 wherein the scattering particles have a spherical shape.
6. An ink composition in accordance with claim 1 wherein the scattering particles comprise comprises particles of TiO 2 with an average particle size of 0.2 μm.
7. An ink composition in accordance with claim 1 wherein the concentration of scattering particles is in a range from 0.001% and 20% by weight.
8. An ink composition in accordance with claim 1 wherein the concentration of scattering particles is in a range from 0.1% and 10% by weight.
9. An ink composition in accordance with claim 1 wherein the concentration of scattering particles is in a range from 0.1% and 3% by weight.
10. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 0.1 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
11. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 1 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
12. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 5 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
13. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 10 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
14. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 25 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
15. An ink composition in accordance with claim 1 wherein the ink composition includes at least about 50 mg of quantum confined semiconductor nanocrystals per ml of liquid vehicle.
16. An ink composition in accordance with claim 1 wherein at least a portion of the quantum confined semiconductor nanocrystals comprises a core/shell structure.
17. An ink composition in accordance with claim 1 wherein the ink composition comprises a dispersion.
18. An ink composition in accordance with claim 1 wherein the ink composition comprises a colloidal dispersion.
19. A device comprising a composition in accordance with claim 1 .
20. An ink composition in accordance with claim 1 wherein the scattering particles scatter a preselected wavelength according to Rayleigh scattering theory.
21. An ink composition comprising:
a light emissive nanomaterial comprising a plurality of quantum confined core-shell semiconductor nanocrystals capable of emitting light,
a plurality of scattering particles,
a viscosity modifier, and
a liquid vehicle, wherein the liquid vehicle comprises a composition including one or more functional groups that are capable of being cross-linked.
22. An ink composition in accordance with claim 21 wherein the functional units are cross-linkable by UV treatment.
23. An ink composition in accordance with claim 21 wherein the functional units are cross-linkable by thermal treatment.
24. An ink composition in accordance with claim 21 wherein the composition including one or more functional groups capable of being cross-linked and the liquid vehicle are the same.
25. An ink composition in accordance with claim 21 wherein the liquid vehicle comprises a mixture of a liquid medium and a composition including one or more functional groups that are capable of being cross-linked itself.
26. An ink composition in accordance with claim 21 wherein the composition including one or more functional groups that are capable of being cross-linked comprises a cosolvent with the liquid vehicle.
27. An ink composition in accordance with claim 21 wherein the ink composition comprises a dispersion.
28. An ink composition in accordance with claim 21 wherein the ink composition comprises a colloidal dispersion.
29. A device comprising an ink composition in accordance with claim 21 .
30. An ink composition comprising a light emissive nanomaterial comprising a plurality of quantum confined semiconductor nanocrystals capable of emitting light and a liquid vehicle, wherein the liquid vehicle comprises a perfluorocompound.
31. An ink composition in accordance with claim 30 wherein the liquid vehicle comprises Fluorinert FC-77.
32. An ink composition in accordance with claim 30 further comprising scatterers.
33. An ink composition in accordance with claim 30 wherein at least a portion of the semiconductor nanocrystals include a fluorinated ligand on a surface thereof.
34. A device comprising an ink composition in accordance with claim 30 .
35. An ink composition comprising:
a light emissive nanomaterial comprising a plurality of quantum confined core-shell semiconductor nanocrystals capable of emitting light,
a plurality of scattering particles,
a viscosity modifier, and
a liquid vehicle.
36. A device comprising an ink composition in accordance with claim 35 .