Compositions and methods including depositing nanomaterial

• US 8,876,272 B2
• Filed: 12/22/2009
• Issued: 11/04/2014
• Est. Priority Date: 06/25/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: QD Vision, Inc. (Samsung Electronics Co. Ltd.)
• Inventors: Linton, John R., Kazlas, Peter T., Breen, Craig, Coe-Sullivan, Seth
• Primary Examiner(s): MARTIN, LAURA E
• Application Number:
  US12/655,074
• Publication Number:
  US 20100265307A1
• Time in Patent Office: 1,778 Days
• Field of Search: 347/100, 106/31.13
• US Class Current: 347/100
• CPC Class Codes: B41J 2/2107 characterised by the ink properties supplying ink in a solid state B41J2/17593
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 7/18 inorganic
• CPC Class Codes: C08K 9/00 Use of pretreated ingredients
• CPC Class Codes: C09D 11/00 Inks
• CPC Class Codes: C09D 11/037 characterised by the pigment
• CPC Class Codes: C09D 11/326 characterised by the pigment dispersant
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes
• CPC Class Codes: C09D 11/52 Electrically conductive inks
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: Y10T 29/49401 Fluid pattern dispersing device making, e.g., ink jet

Abstract

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.

Claims

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 TiO₂, SiO₂, BaTiO₃, 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 TiO₂ with an average particle size of 0.2 μ

m.

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.