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Process for manufacturing systems for conversion of water into hydrogen and sorption of hydrogen

a manufacturing system and technology for water, applied in the manufacture of electrode systems, electric discharge tubes/lamps, other domestic articles, etc., can solve the problems of oled gas entering the oled during the production of hydrogen, deterioration of the oled, and forming black spots on the screen surfa

Inactive Publication Date: 2005-09-08
SAES GETTERS SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a system that can remove water and convert it into hydrogen for use in electronic devices. This system is particularly useful for screens containing electroluminescent organic materials. The system includes two layers that are in direct contact with each other. One layer is made of a material that can absorb hydrogen, while the other layer is made of a material that can convert water into hydrogen. The technical effect of this invention is the ability to provide a system that can effectively remove water and hydrogen from electronic devices, which can improve their performance and reliability.

Problems solved by technology

A problem encountered with the functioning of OLEDs is their deterioration following to exposure to moisture, which can react with the organic materials (generally polyunsaturated and therefore rather reactive species), as well as with the cathode, formed of particularly reactive metals.
The portions concerned with these reactions loose their light-emitting functionality, thus forming black spots on the screen surface.
The introduction of a gas in an OLED during the production thereof is however difficult to realize.
A possible problem with the use of this kind of sorbers is that these materials are generally in powder form, and therefore must be retained by a sheet (for example a nonwoven fabric) permeable to water but able to retain the powder particles.
Another problem that does not allow the decrease the tickness of the sorbing systems based on the use of CaO or similar is the reduction of the water sorbing capacity.
These metals are very reactive, and a drawback is that hydrogen can collect in the OLED thus building up a partial pressure inside the device which can pose safety problems.

Method used

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  • Process for manufacturing systems for conversion of water into hydrogen and sorption of hydrogen
  • Process for manufacturing systems for conversion of water into hydrogen and sorption of hydrogen
  • Process for manufacturing systems for conversion of water into hydrogen and sorption of hydrogen

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first embodiment

[0034]FIG. 2 shows the support 105 of OLED 10, on which is arranged the system according to the invention in a first embodiment thereof. The system is formed of a layer 201 of material capable of sorbing hydrogen, directly deposited on the surface of the second support of the OLED and of a second layer 202 of a material capable of converting water into hydrogen, deposited onto the first layer.

[0035] Then, other embodiments are possible, which allow to obtain the system of the invention independently of the final device, that is, without involving elements of the latter during the preparation of said system.

second embodiment

[0036] With this regard, the invention is to be considered, shown in FIG. 3, which uses as a substrate a monoadhesive sheet: therein, the layer 304 of hydrogen sorbing material and the layer 305 of material capable of converting water into hydrogen have been deposited on a monoadhesive sheet 301, formed of a support 302, an adhesive layer 303. Soon after production, the system represented in FIG. 3 also comprises a protective sheet of paper covering the adhesive layer, but this protective sheet is removed before placing the system in contact with support 105, and is thus not shown in the drawing.

third embodiment

[0037] the invention is shown in FIG. 4; therein, the layer 405 of hydrogen sorbing material and the layer 406 of material capable of converting water into hydrogen are deposited on a biadhesive layer 401, formed of a support 402 covered on both sides with adhesive layers 403, 404 and with paper sheets of which only some parts are shown in the figure.

[0038] An alternate use of the invention relates to manufacturing processes of the system in some possible above described embodiments.

[0039] The layer of hydrogen sorbing material can be deposited by means of a suitable technique which allows to form thin films: in the case of titanium and of the unsaturated organic compounds of low molecular weight, evaporation can be used, while in the case of the zirconium and of the alloys in general it is necessary to use other techniques, such as Physical Vapor Deposition, also known as PVD or “sputtering”, which is well known in the art and does not need to be described here.

[0040] The film of...

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Abstract

The invention teaches a system suitable for use in a water-sensitive electronic device which comprises two superimposed layers, the first material of which is formed of a material capable of sorbing hydrogen, the second material formed of a material capable of converting water into hydrogen; a screen of the type with light-emitting organic diodes comprising the system according to the invention.

Description

REFERENCE TO PRIORITY DOCUMENTS [0001] This application claims priority under 35 U.S.C. 119 to Italian Application MI2001A2010, filed on Sep. 27, 2001, which is incorporated by reference for all purposes. BACKGROUND [0002] It is generally known in the art that the functionality of many electronic devices can be altered by the contact with water, even if only present in traces. In semiconductor devices water can oxidize the electric contacts or chemically alter some parts thereof, or of laser amplifiers used in optical fiber communications. This is described in EP-A-720260. [0003] An electronic application of high industrial interest wherein absence of water is requested are electroluminescent screens based on the use of organic materials, is known in the field as OLEDs (from “Organic Light Emitting Devices”). [0004] The structure of an OLED is formed of a first transparent, essentially planar support, generally made of glass or of a plastic polymer; a first series of transparent lin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05B33/04H01L51/50H01L51/52H05B33/10
CPCH01L51/5237Y10S428/917Y10T428/12771Y10T428/12806Y10T428/12792Y10T428/12986Y10T156/10H10K59/874H01J7/18H10K50/846
Inventor FERRARIO, BRUNOTOMINETTI, STEFANOGALLITOGNOTTA, ALESSANDRO
Owner SAES GETTERS SPA