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Hydro-insensitive electroluminescent devices and methods of manufacture thereof

a technology of electroluminescent devices and hydro-insensitive devices, which is applied in the field of electroluminescent materials, can solve the problems of limiting the use of such devices and imposing relatively high barriers on certain devices

Inactive Publication Date: 2007-12-27
FLEXCON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables electroluminescent devices to operate unaffected by water vapor presence or absence, reducing costs and expanding their usage in various environments.

Problems solved by technology

Such moisture barriers may be relatively expensive for certain devices, and may limit the uses of such devices.

Method used

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  • Hydro-insensitive electroluminescent devices and methods of manufacture thereof
  • Hydro-insensitive electroluminescent devices and methods of manufacture thereof
  • Hydro-insensitive electroluminescent devices and methods of manufacture thereof

Examples

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Embodiment Construction

[0017] The invention provides for the development of electroluminescent materials that may be inert to conditions of water vapor penetration and condensation. This permits the packaging of electroluminescent composites to not be required to be water vapor impermeable.

[0018] In accordance with an embodiment of the invention, an electroluminescent composite 10 may include phosphorescent particles 12 that are dispersed within a polymeric material 14 as shown in FIG. 1. It is preferred that all of the phosphorescent particles be coated by the polymeric material, even near the surface of the composite. The polymeric material permits water vapor to pass through the polymeric material as indicated at A and B. The polymeric and phosphorescent particles are chosen so that the surface energies of each material are each within range of about 32 to about 46 dynes / cm. Water vapor, therefore, will not condense at the interface between the polymeric material and the phosphorescent particles. Beca...

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Abstract

A composite is disclosed for use in electro-luminescent devices. The composite includes polymeric material having a first surface energy, and phosphorescent material dispersed within said polymeric material. The phosphorescent material has a second surface energy, said first and second surface energies are each between about 32 dynes / cm and 46 about dynes / cm. The polymeric material has a moisture vapor transmission rate of at least one gram / 100 sq. inches for a 24 hour period at 100° F. for a one mil thick barrier.

Description

PRIORITY INFORMATION [0001] The present application claims priority to U.S. Provisional Patent Applications Ser. Nos. 60 / 371,375 filed Apr. 10, 2002, and 60 / 404,420 filed Aug. 19, 2002.BACKGROUND OF THE INVENTION [0002] The invention relates to luminescent materials and relates in particular to electroluminescent devices that include luminescent materials. [0003] Electroluminescent materials generally include phosphorescent particles that are suspended within or coated by a polymeric material. Electroluminescent devices typically provide an electric field in the area of the phosphorescent particles to cause the particles to glow. Such devices may be used for a wide variety of uses such as advertising, lighted keyboards and other such displays, accent lighting in automobiles, backlighting for liquid crystals displays, nightlights, etc. [0004] Such devices typically include a protective layer that used to keep water vapor from entering the polymeric material. For example, U.S. Pat. No...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B9/04B32B27/32B32B27/36B44C1/165B32B33/00B31B50/62C09K11/00C09K11/02C09K11/06C09K11/08H05B33/04H05B33/10H05B33/14H05B33/20
CPCC09K11/02H05B33/04Y10T428/14H05B33/20Y10S428/917H05B33/10Y10T428/249983Y10T428/31504Y10T428/31786Y10T428/31938C09K11/06
Inventor MCDONOUGH, NEILSEGALL, DANIEL P.HILTON, IRIS E.PENNACE, JOHN R.
Owner FLEXCON