Abstract:
A field emission device is made by pre-activating ultra-fine diamond particles before applying them to the device substrate. This initial pre-activation increases manufacturing speed and reduces cost and reduces potential damage to the device substrate from exposure to high temperature hydrogen plasma. A method for making an electron field emission device comprises the steps of: providing particles comprising diamonds; having said diamonds predominantly comprising diamonds having maximum dimensions in the range of 5-10,000 nm; exposing said particles to a plasma-containing hydrogen at a temperature in excess of 300°C; adhering said particles to a substrate having a conductive portion; and disposing an electrode adjacent said diamond particles.
Abstract:
Enhanced field emitters are made by coating particulate substrates with low voltage emissive material such as defect-rich diamond. These methods permit the advantageous, low-cost combination of low voltage emission with sharp-featured geometry.
Abstract:
A flat panel display for displaying visual information includes a plurality of corresponding light-emitting anodes (130), and field-emission cathodes (170), each of the anodes emitting light in response to emission from each of the corresponding cathodes, each of the cathodes (170) including a layer of low work function material having a relatively flat emission surface of a plurality of distributed localized electron emission sites and a grid assembly (102) interposed between the corresponding anodes (130) and cathodes (170) to thereby control emission levels to the anodes from the corresponding cathodes.
Abstract:
A novel and advantageous cathode structure for a field emission display apparatus is disclosed. A given pixel comprises a multiplicity of spaced apart emitter bodies (147) on a support (141). A given emitter body comprises diamond and/or rare earth boride, and has a relatively sharp geometrical feature that facilitates electron emission from the emitter body. Exemplarily the emitter body comprises in situ grown diamond, or it comprises a pre-existing diamond particle that was placed on the support. Such emitter bodies generally can be provided easily and at low cost, and typically have naturally occurring sharp geometrical features such as points and edges. We have also discovered that appropriately grown rare earth boride films of thickness 30 nm or less may substantially improve electron emission from emitter bodies, and some preferred embodiments of the invention comprise a cathode structure that comprises a thin layer of, e.g., LaB₆ on the emitter bodies. Exemplary methods of making cathodes according to the invention are also disclosed.
Abstract:
An electron source includes a back contact surface having a means for attaching a power source to the back contact surface. The electron source also includes a layer comprising platinum in direct contact with the back contact surface, a composite layer of single-walled carbon nanotubes embedded in platinum in direct contact with the layer comprising platinum. The electron source also includes a nanocrystalline diamond layer in direct contact with the composite layer. The nanocrystalline diamond layer is doped with boron. A portion of the back contact surface is removed to reveal the underlying platinum. The electron source is contained in an evacuable container.
Abstract:
Diamond-like carbon based energy conversion devices and methods of making and using the same which have improved conversion efficiencies and increased reliability. Such a device may include a cathode (25) having a base member (60) with a layer of diamond-like carbon material (5) coated over at least a portion thereof, an intermediate member (55) electrically coupled to the diamond-like carbon material (5), the intermediate member (55) including a plurality of carbon structures coated with a layer of an insulating material, and an anode (30) electrically coupled to the intermediate member (55) opposite the diamond-like carbon material.
Abstract:
An amorphous diamond material (5) and an intermediate member (55) coupled between the cathode (25) and an anode (30). The amorphous diamond material (5) can have at least about 90 % carbon atoms with at least about 20 % of the carbon atoms bonded in a distorted tetrahedral coordination. The amorphous diamond coating (5) has an energy input surface (10) in contact with a base member of the cathode (25) and an electron emission surface (15) opposite the energy input surface (10). The electron emission surface (15) can have an asperity height of from about 10 to about 1,000 nanometers and is capable of emitting electrons upon input of a sufficient amount of energy. The intermediate member (55) can be coupled to the electron emission surface (15) of the amorphous diamond coating (5) such that An amorphous diamond electrical generator having a cathode (25) at least partially coated with amorphous the intermediate member (55) has a thermal conductivity of less than about 100 W/mK and a resistivity of less than about 80 µohm-cm. at 20 °C. The amorphous diamond electrical generator is a thermionic emission device having improved electron emission properties.
Abstract:
Novel heterodiamondoid-containing field emission devices (FED's) are disclosed herein. In one embodiment of the present invention, the heteroatom of the heterodiamondoid comprises an electron-donating species (such as nitrogen) as part of the cathode or electron-emitting component of the field emission device.
Abstract:
An amorphous diamond material (5) and an intermediate member (55) coupled between the cathode (25) and an anode (30). The amorphous diamond material (5) can have at least about 90 % carbon atoms with at least about 20 % of the carbon atoms bonded in a distorted tetrahedral coordination. The amorphous diamond coating (5) has an energy input surface (10) in contact with a base member of the cathode (25) and an electron emission surface (15) opposite the energy input surface (10). The electron emission surface (15) can have an asperity height of from about 10 to about 1,000 nanometers and is capable of emitting electrons upon input of a sufficient amount of energy. The intermediate member (55) can be coupled to the electron emission surface (15) of the amorphous diamond coating (5) such that An amorphous diamond electrical generator having a cathode (25) at least partially coated with amorphous the intermediate member (55) has a thermal conductivity of less than about 100 W/mK and a resistivity of less than about 80 µΩ-cm. at 20 °C. The amorphous diamond electrical generator is a thermionic emission device having improved electron emission properties.
Abstract:
Novel uses of diamondoid-containing materials in the field of microelectronics are disclosed. Embodiments include, but are not limited to, thermally conductive films in integrated circuit packaging, low-k dielectric layers in integrated circuit multilevel interconnects, thermally conductive adhesive films, thermally conductive films in thermoelectric cooling devices, passivation films for integrated circuit devices (ICs), and field emission cathodes. The diamondoids employed in the present invention may be selected from lower diamondoids, as well as the newly provided higher diamondoids, including substituted and unsubstituted diamondoids. The higher diamondoids include tetramantane, pentamantane, hexamantane, heptamantane, octamantane, nonamantane, decamantane, and undecamantane. The diamondoid-containing material may be fabricated as a diamondoid-containing polymer, a diamondoid-containing sintered ceramic, a diamondoid ceramic composite, a CVD diamondoid film, a self-assembled diamondoid film, and a diamondoid-fullerene composite.