Past-deposited carbon electron emitters
AssigneeE.I. du Pont de Nemours and Company
InventorsDaniel Irwin Amey, Jr., Robert Joseph Bouchard, Syed Ismat Ullah Shah, John Gerard Lavin
Life of this patent
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Abstract
Patterned ion-bombarded carbon electron emitters and the processes for producing them. The electron emitters are produced by forming a layer of composite of carbon particles and glass on a substrate then bombarding the composite with an ion beam. The electron emitters are useful in field emitter cathode assemblies which are fabricated into flat panel displays.
Claims37
A process for producing a field emission electron emitter, which comprises:
- (a) forming a layer of composite which comprises graphite particles and glass on a substrate, wherein said glass adheres to said substrate and to portions of said graphite particles thereby affixing said graphite particles to one another and to said substrate and wherein at least 50% of the surface area of said layer of composite consists of portions of said graphite particles;
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- (b) bombarding the surface of the layer formed in (a) with an ion beam which comprises ions of argon, neon, krypton or xenon for a time sufficient to form whiskers on said graphite particles.
A process for forming a layer of composite which comprises graphite and glass on a substrate, which comprises:
- (a) screen printing a paste comprised of graphite particles and glass frit onto the substrate in a desired pattern, wherein the volume per cent of said graphite particles is about 35% to about 80% of the total volume of the said graphite particles and said glass frit;
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- (b) firing the dried patterned paste to soften said glass frit and cause it to adhere to said substrate and to portions of said graphite particles thereby affixing said graphite particles to one another and to said substrate to produce said layer of composite, wherein at least 50% of the surface area of said layer of composite consists of portions of said graphite particles.
A process for producing a field emission electron emitter, which comprises forming a layer of composite which comprises carbon nanotubes and glass on a substrate, wherein said glass adheres to said substrate and to portions of said carbon nanotubes thereby affixing said carbon nanotubes to one another and to said substrate and wherein at least 50% of the surface area of said layer of composite consists of portions of said carbon nanotubes.
Dependencies are inferred from the claim text.