Thick film getter paste compositions with pre-hydrated desiccant for use in atmosphere control

a technology of thick film and desiccant, which is applied in the direction of solid cathodes, gas-filled discharge tubes, x-ray tubes, etc., can solve the problems of degrading performance, not always adequately addressing problems, and many packaged devices are susceptible to damag
US20070013305A1Inactive Publication Date: 2007-01-18EI DU PONT DE NEMOURS & CO
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
EI DU PONT DE NEMOURS & CO
Publication Date
2007-01-18
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention is directed to a screen-printable getter composition comprising: (a) glass frit; and (b) pre-hydrated desiccant material; dispersed in (c) organic medium. The present invention further relates to a getter composition utilizing low-softening temperature glasses comprising, based on weight %, 1-50% SiO2, 0-80% B2O3, 0-90% Bi2O3, 0-90% PbO, 0-90% P2O5, 0-60% Li2O, 0-30% Al2O3, 0-10% K2O, 0-10% Na2O, and 0-30% MO where M is selected from Ba, Sr, Ca, Zn, Cu, Mg and mixtures thereof. The glasses described herein may contain several other oxide constituents that can substitute glass network-forming elements or modify glass structure. The desiccant material is pre-hydrated to reach its saturation level of moisture absorption. The process of pre-hydration can be done by exposing the desiccant in a normal temperature / humidity environment of for example, 25° C. and 50-60% RH. for 24 to 48 hours or up to the time when weight gain (due to moisture absorption) stops increasing. An accelerated hydration process in a chamber with higher than normal humidity level (i.e. 50% Relative Humidity) is also applicable to shorten the time of exposure to fully hydrate the desiccant material.
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Description

FIELD OF THE INVENTION

[0001] The invention is directed to thick film getter paste compositions with pre-hydrated desiccant for use in controlling moisture, oxygen, and small organic molecule levels in sensitive electronic and photonic devices. BACKGROUND OF THE INVENTION

[0002] The invention describes thick film getter compositions for use in controlling moisture, oxygen, and small organic molecule levels. Many packaged devices are susceptible to damage from undesired levels of moisture, oxygen, and small organic molecules and this is especially so in the case of various electronic, display, and light sensing or emitting devices. Examples of the types of damage caused or aggravated by the gas or condensed phase impurities include; hydration, oxidation, corrosion, and ion migration. In the case of FED (Field Emission Display) or SED (Surface Emission Display), the residue gasses may cause the undesirable modification of the emitter tip surface work function and degrade the performan...

Claims

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