Light-emitting diode (LED) devices comprising nanocrystals

• US 9,677,001 B2
• Filed: 01/25/2013
• Issued: 06/13/2017
• Est. Priority Date: 03/19/2007
• Status: Active Grant

• Current Assignee: Shoei Chemical Inc.
• Original Assignee: Nanosys Incorporated (Shoei Electronic Materials, Inc.)
• Inventors: Dubrow, Robert S., Chen, Jian, Hardev, Veeral D., Hofler, H. Jurgen, Lee, Ernest
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US13/750,131
• Publication Number:
  US 20130196460A1
• Time in Patent Office: 1,600 Days
• CPC Class Codes: B32B 2457/206 Organic displays, e.g. OLED
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: G02B 1/02 made of crystals, e.g. rock-salt, semi-conductors G02B1/08 takes precedence
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y10S 977/81 Of specified metal or metal alloy composition
• CPC Class Codes: Y10S 977/834 Optical properties of nanomaterial, e.g. specified transparency, opacity, or index of refraction
• CPC Class Codes: Y10S 977/952 Display
• CPC Class Codes: Y10T 156/10 : Methods of surface bonding and/or assembly therefor

Abstract

The present invention provides light-emitting diode (LED) devices comprises compositions and containers of hermetically sealed luminescent nanocrystals. The present invention also provides displays comprising the LED devices. Suitably, the LED devices are white light LED devices.

Claims

1. A method comprising:

dispersing luminescent nanocrystals in aminosilicone to form a first mixture;

introducing the first mixture into a container comprising a glass or plastic material;

adding a cross-linker to the first mixture in the container to form a second mixture;

curing the second mixture in the container; and

hermetically sealing the container.

2. The method of claim 1, wherein the dispersing further comprises dispersing the luminescent nanocrystals comprising CdSe or ZnS.

3. The method of claim 1, wherein the dispersing further comprises dispersing the luminescent nanocrystals comprising CdSe/ZnS, InP/ZnS, PbSe/PbS, CdSe/CdS, CdTe/CdS, or CdTe/ZnS.

4. The method of claim 1, wherein the introducing of the first mixture comprises drawing the first mixture into the container with a vacuum or suction mechanism.

5. The method of claim 1, wherein the container comprises a glass or plastic capillary.

6. The method of claim 1, wherein the introducing of the first mixture comprises drawing the first mixture into a glass or plastic capillary with a vacuum or suction mechanism.

7. The method of claim 5, further comprising providing the glass or plastic capillary having at least one dimension of about 100 μ

m to about 1 mm.

8. The method of claim 1, wherein the hermetically sealing of the container comprises heat sealing the container.

9. The method of claim 1, wherein the hermetically sealing of the container comprises adhesive bonding the container.

10. The method of claim 1, wherein the hermetically sealing of the container comprises sealing an end of the container with a filled epoxy or a liquid crystalline polymer.

11. The method of claim 1, wherein the introducing of the first mixture comprises applying a reduced pressure to an end of the container to draw the first mixture into the container.

12. The method of claim 1, further comprising optically coupling the hermetically sealed container to at least one LED device.

13. The method of claim 1, further comprising optically coupling the hermetically sealed container to at least two LED devices.

14. The method of claim 13, wherein the hermetically sealed container is spaced apart from the at least two LED devices.

15. The method of claim 1, wherein the luminescent nanocrystals emit green light or red light.