Quantum dots, method, and devices

• US 9,887,316 B2
• Filed: 09/30/2013
• Issued: 02/06/2018
• Est. Priority Date: 04/01/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Breen, Craig, Steckel, Jonathan S.
• Primary Examiner(s): Stark, Jarrett
• Assistant Examiner(s): Ausar-El, Charles N
• Application Number:
  US14/041,618
• Publication Number:
  US 20140027711A1
• Time in Patent Office: 1,590 Days
• Field of Search: 257 13
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 11/08 containing inorganic luminescent materials
• CPC Class Codes: C09K 2211/14 Macromolecular compounds
• CPC Class Codes: H01L 33/04 with a quantum effect structure or superlattice, e.g. tunnel junction
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

A quantum dot including a fluorine-containing ligand attached to a surface thereof and having a coating comprising a fluoropolymer over at least a portion of the outer surface of the quantum dot. A method for preparing a quantum dot with a coating comprising a fluoropolymer over at least a portion of the outer surface of the quantum dot is also disclosed. The method comprises contacting a quantum dot having a fluorine-containing ligand attached to a surface thereof with a fluoropolymer to coat the fluoropolymer over at least a portion of the outer surface of the quantum dot. A device including the quantum dot taught herein is further disclosed. An emissive material including the quantum dot taught herein is further disclosed.

Claims

1. A quantum dot including a fluorine-containing ligand attached to a surface thereof and further including a coating comprising a fluoropolymer that surrounds the outer surface of the quantum dot and the fluorine-containing ligand attached to the surface thereof,

wherein the fluoropolymer comprises a first functional group on the inner surface of the coating, wherein the first functional group comprises an aliphatic moiety comprising a main chain including at least 2 carbon atoms and one or more fluorine atoms, and wherein the first functional group is associated with the fluorine-containing ligand attached to the surface of the quantum dot,

wherein the fluoropolymer further comprises a plurality of non-fluorine containing functional groups on an outer surface of the coating, and

wherein the coating comprising the fluoropolymer has a thickness less than or equal to 100 nm.

2. A quantum dot in accordance with claim 1 wherein the fluoropolymer further includes one or more additional functional groups.

3. A quantum dot in accordance with claim 2 wherein an additional functional group comprises a hydroxyl group.

4. A quantum dot in accordance with claim 1 wherein the coating comprising the fluoropolymer functions as an electronic insulating layer around the quantum dot.

5. A quantum dot in accordance with claim 1 wherein the coating comprising the fluoropolymer allows energy transfer as the mode of quantum dot excitation.

6. A quantum dot in accordance with claim 1 further comprising one or more additional functional groups on the outer surface of the coating comprising the fluoropolymer, wherein at least one of the additional functional groups is selected to provide the coated quantum dot with predetermined properties.

7. A quantum dot in accordance with claim 1 further comprising one or more additional functional groups on the outer surface of the coating comprising the fluoropolymer, wherein at least one of the additional functional groups is selected to provide the coated quantum dot with hydrophilic characteristics.

8. A quantum dot in accordance with claim 1 further comprising one or more additional functional groups on the outer surface of the coating comprising the fluoropolymer, wherein at least one of the additional functional groups is selected to provide the coated quantum dot with hydrophobic characteristics.

13. An emissive material comprising a quantum dot in accordance with claim 1.

14. A quantum dot in accordance with claim 1 wherein the fluoropolymer further includes one or more additional functional groups.

15. A quantum dot in accordance with claim 1 wherein an outer portion of the fluoropolymer is functionalized with a group that has energy transferring properties.

9. A device comprising a pair of electrodes and including a layer therebetween, the layer comprising a quantum dot including a fluorine-containing ligand attached to a surface thereof and further including a coating comprising a fluoropolymer that surrounds the outer surface of the quantum dot and the fluorine-containing ligand attached to the surface thereof,

wherein the fluoropolymer comprises a first functional group on the inner surface of the coating, wherein the first functional group comprises an aliphatic moiety comprising a main chain including at least 2 carbon atoms and one or more fluorine atoms, and wherein the first functional group is associated with the fluorine-containing ligand attached to the surface of the quantum dot,

wherein the fluoropolymer further comprises a plurality of non-fluorine containing functional groups on an outer surface of the coating, and

wherein the coating comprising the fluoropolymer has a thickness less than or equal to 100 nm.

10. A device in accordance with claim 9 further including a protective coating over a surface of the device opposite a substrate on which the device is supported.

11. A light-emitting device comprising a pair of electrodes and including a layer therebetween, the layer comprising an emissive material comprising a quantum dot including a fluorine-containing ligand attached to a surface thereof and further including a coating comprising a fluoropolymer that surrounds the outer surface of the quantum dot and the fluorine-containing ligand attached to the surface thereof,

wherein the fluoropolymer comprises a first functional group on the inner surface of the coating, wherein the first functional group comprises an aliphatic moiety comprising a main chain including at least 2 carbon atoms and one or more fluorine atoms, and wherein the first functional group is associated with the fluorine-containing ligand attached to the surface of the quantum dot,

wherein the fluoropolymer further comprises a plurality of non-fluorine containing functional groups on an outer surface of the coating, and

wherein the coating comprising the fluoropolymer has a thickness less than or equal to 100 nm.

12. A light-emitting device in accordance with claim 11 further including a protective coating over a surface of the device opposite a substrate on which the device is supported.