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Light-Emitting Diode (LED) Devices Comprising Nanocrystals

a technology of led devices and nanocrystals, which is applied in the field of led devices comprising luminescent nanocrystals, can solve the problems of limiting the use of luminescent nanocrystals, requiring frequent replacement, and loss of luminescence, and achieve the effect of facilitating the down-conversion of luminescent nanocrystals

Inactive Publication Date: 2013-07-18
NANOSYS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Luminescent nanocrystals when exposed to air and moisture undergo oxidative damage, often resulting in a loss of luminescence.
These factors, along with requirements for long luminescent lifetime in these applications, often limits the use of luminescent nanocrystals or requires frequent replacement.

Method used

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  • Light-Emitting Diode (LED) Devices Comprising Nanocrystals
  • Light-Emitting Diode (LED) Devices Comprising Nanocrystals
  • Light-Emitting Diode (LED) Devices Comprising Nanocrystals

Examples

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example 1

Preparation of Hermetically Sealed Containers

[0156]A rectangular tube of approximate dimensions 3 mm×0.5 mm with a 2 mm×0.5 mm cavity is prepared by extrusion of PMMA. The length of tubing is then filled with a solution comprising fluorescent luminescent nanocrystals. The luminescent nanocrystal solution is then cured. Segments of the tubing are then heat sealed to trap the nanocrystals in the tubing. Suitably the filling and sealing are performed in an inert atmosphere. A barrier layer (e.g., SiO2, TiO2 or AlO2) can then be disposed on the outer surface of the tubing.

[0157]A drawn glass capillary can also be used to prepare a hermetically sealed container comprising nanocrystals. The end of the capillary is sealed either via melt sealing or plugging with a solder or adhesive or similar structure. The capillary can be filled with a solution of luminescent nanocrystals such that the entire volume of the capillary is filled with the same nanocrystal solution, or the capillary can be f...

example 2

Preparation of Nanocrystals Composite Materials

[0158]Luminescent nanocrystals (e.g., CdSe / ZnS) that emit red (630 nm) and green (530 nm) light are mixed at a 3% weight concentration into an aminosilicone polymer. The aminosilicon polymer has a viscosity of 350 centipoises, and comprises 5% amino groups and 95% dimethylsiloxane. The resulting composition has an optical density of about 0.8 and a path length of 100 μm.

[0159]An epoxide cross linker is added and the material is cured to form a rubber. The cured quantum dot composition is then placed into a ball mill and ground into a 50 μm powder.

[0160]The powder is then mixed into a two part epoxy at about 30% loading, and the polymer is degassed. The refractive index of the nanocrystals and the epoxy are suitably matched so as to minimize light scattering and the resulting absorptions by the nanocrystals.

[0161]The epoxy / nanocrystal mixture is cast onto a TEFLON® sheet at a thickness of about 300 μm. After curing, the film is removed. ...

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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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a division of U.S. application Ser. No. 12 / 609,736, filed Oct. 30, 2009, which is a continuation-in-part of U.S. application Ser. No. 12 / 076,530, filed Mar. 19, 2008. U.S. application Ser. No. 12 / 076,530 claims the benefit of U.S. Provisional Patent Application No. 60 / 895,656, filed Mar. 19, 2007, and U.S. Provisional Patent Application No. 60 / 985,014, filed Nov. 2, 2007. The disclosures of each of these applications are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to methods light-emitting diode (LED) devices comprising luminescent nanocrystals, suitably white light LEDs. The present invention also relates to display systems comprising the LED devices.[0004]2. Background of the Invention[0005]Luminescent nanocrystals when exposed to air and moisture undergo oxidative damage, often resulting in a loss of lumines...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05B33/04
CPCC09K11/025Y10T156/10C09K11/883G02B6/0041H01L33/502H01L33/505H01L33/507H01L2933/0041Y02B20/181B82Y20/00H05B33/04Y10S977/952G02B6/0068Y10S977/81Y10S977/834H01L2924/0002C09K11/565H01L2924/00Y02B20/00B32B2457/206G02B1/02G02B1/10
Inventor DUBROW, ROBERT S.CHEN, JIANHARDEV, VEERAL D.HOFLER, H. JURGENLEE, ERNEST
Owner NANOSYS INC