Abstract: An electron emission device includes a number of first electrodes and a number of second electrodes intersected with each other to define a number of intersections. An electron emission unit is sandwiched between the first electrode and the second electrode at each of the number of intersections, wherein the electron emission unit includes a semiconductor layer and an insulating layer stacked together, the semiconductor layer defines a number of holes, the carbon nanotube layer covers the number of holes, and a portion of the carbon nanotube layer is suspended on the number of holes.

Abstract: An electron emission device includes a number of electron emission units spaced from each other, wherein each of the number of electron emission units includes a first electrode, a semiconductor layer, an insulating layer, and a second electrode stacked with each other, the first electrode includes a carbon nanotube layer, a number of holes defines in the semiconductor layer, and a portion of the carbon nanotube layer suspended on the number of holes.

Abstract: An electron emission device includes a number of electron emission units spaced from each other, wherein each of the number of electron emission units includes a first electrode, a semiconductor layer, an electron collection layer, an insulating layer, and a second electrode stacked with each other, the electron collection layer is in contact with the semiconductor layer and the insulating layer, and the electron collection layer is a conductive layer.

Abstract: An electron emission source includes a first electrode, a semiconductor layer, an insulating layer, and a second electrode stacked in that sequence, wherein the semiconductor layer defines a number of holes, the first electrode comprises a carbon nanotube layer, and a portion of the carbon nanotube layer corresponding to the number of holes is suspended on the number of holes.

Abstract: An electron emission device includes a number of second electrodes intersected with a number of first electrodes to define a number of intersections. An electron emission unit is sandwiched between the first electrode and the second electrode at each of the number of intersections, wherein the electron emission unit includes a semiconductor layer, an electron collection layer, and an insulating layer stacked together, and the electron collection layer is a conductive layer.

Abstract: An electron emission source includes a first electrode, a semiconductor layer, an insulating layer, and a second electrode stacked in that sequence, wherein an electron collection layer is sandwiched between the semiconductor layer and the insulating layer, the electron collection layer is in contact with the semiconductor layer and the insulating layer, and the electron collection layer is a conductive layer to collect electrons.

Abstract: An X-ray tube includes a vacuum tube. A field emission cathode structure and an anode spaced from each other are located in the vacuum tube. The field emission cathode structure includes a first metal plate, a second metal plate, and an electron emitter. The electron emitter is fixed between the first metal plate and the second metal plate. One end of the electron emitter extends out of the first metal plate and the second metal plate to act as an electron emission end.

Abstract: A field emission cathode device includes a cathode electrode. An electron emitter is electrically connected to the cathode electrode, wherein the electron emitter includes a number of sub-electron emitters. An electron extracting electrode is spaced from the cathode electrode by a dielectric layer, wherein the electron extracting electrode defines a through-hole. The distances between an end of each of the sub-electron emitters away from the cathode electrode and a sidewall of the through-hole are substantially equal.

Abstract: A field emission cathode device includes a cathode substrate, a gate electrode, a first dielectric layer, a cathode electrode, and an electron emission layer. The gate electrode is located on a surface of the cathode substrate. The first dielectric layer is located on a surface of the gate electrode and defines a first opening to expose part of the gate electrode. The cathode electrode is spaced from the gate electrode through the first dielectric layer defining a second opening in alignment with the first opening. A field emission display using the field emission cathode device is also related.

Abstract: An inkjet ink includes carbon nanotubes, flake graphites, an organic carrier, a binder, a surfactant, a film enhancer and a solvent. A method for making an inkjet ink includes dispersing the plurality of carbon nanotubes in the surfactant solvent to form a first mixture, dispersing the plurality of flake graphites in the organic carrier solvent to form a second mixture, adding the film enhancer into the second mixture to form a third mixture, and mixing the first mixture and the third mixture.

Abstract: A method for establishing a vacuum in a container includes the following steps. The container having an exhaust through hole defined therein is provided. A sealing cover including a connecting material located on the periphery of the sealing cover is provided. The sealing cover is spaced from the exhaust through hole for form at least gaps between the sealing cover and the exhaust through hole. A vacuum is established in the container. The connecting material is heated. The sealing cover covers the exhaust through hole and the connecting material is cooled. After that the container is packaged.

Abstract: An ion source using a field emission device is provided. The field emission device includes an insulative substrate, an electron pulling electrode, a secondary electron emission layer, a first dielectric layer, a cathode electrode, and an electron emission layer. The electron pulling electrode is located on a surface of the insulative substrate. The secondary electron emission layer is located on a surface of the electron pulling electrode. The cathode electrode is located apart from the electron pulling electrode by the first dielectric layer. The cathode electrode has a surface oriented to the electron pulling electrode and defines a first opening as an electron output portion. The electron emission layer is located on the surface of the cathode electrode and oriented to the electron pulling electrode.

Abstract: A method for making a field emission device includes the following steps. An insulative substrate is provided. An electron pulling electrode is formed on the insulative substrate. A secondary electron emission layer is formed on the electron pulling electrode. A first dielectric layer is fabricated. The first dielectric layer has a second opening to expose the secondary electron emission layer. A cathode plate having an electron output portion is provided. An electron emission layer is formed on part surface of the cathode plate. The cathode plate is placed on the first dielectric layer. The electron output portion and the second opening have at least one part overlapped, and at least one part of the electron emission layer is oriented to the secondary electron emission layer via the second opening.

Abstract: A field emission device includes an insulative substrate, an electron pulling electrode, a secondary electron emission layer, a first dielectric layer, a cathode electrode, and an electron emission layer. The electron pulling electrode is located on a surface of the insulative substrate. The secondary electron emission layer is located on a surface of the electron pulling electrode. The cathode electrode is located apart from the electron pulling electrode by the first dielectric layer. The cathode electrode has a surface oriented to the electron pulling electrode and defines a first opening as an electron output portion. The electron emission layer is located on the surface of the cathode electrode and oriented to the electron pulling electrode.

Abstract: An inkjet ink includes carbon nanotubes, flake graphites, an organic carrier, a binder, a surfactant, a film enhancer and a solvent. A method for making an inkjet ink includes dispersing the plurality of carbon nanotubes in the surfactant solvent to form a first mixture, dispersing the plurality of flake graphites in the organic carrier solvent to form a second mixture, adding the film enhancer into the second mixture to form a third mixture, and mixing the first mixture and the third mixture.

Abstract: A field emission cathode device includes a cathode substrate, a gate electrode, a first dielectric layer, a cathode electrode, and an electron emission layer. The gate electrode is located on a surface of the cathode substrate. The first dielectric layer is located on a surface of the gate electrode and defines a first opening to expose part of the gate electrode. The cathode electrode is spaced from the gate electrode through the first dielectric layer defining a second opening in alignment with the first opening. A field emission display using the field emission cathode device is also related.

Abstract: An ion source using a field emission device is provided. The field emission device includes an insulative substrate, an electron pulling electrode, a secondary electron emission layer, a first dielectric layer, a cathode electrode, and an electron emission layer. The electron pulling electrode is located on a surface of the insulative substrate. The secondary electron emission layer is located on a surface of the electron pulling electrode. The cathode electrode is located apart from the electron pulling electrode by the first dielectric layer. The cathode electrode has a surface oriented to the electron pulling electrode and defines a first opening as an electron output portion. The electron emission layer is located on the surface of the cathode electrode and oriented to the electron pulling electrode.

Abstract: A vacuum packaging system for packaging a vacuum apparatus includes a first accommodating room, a second container, a vacuum room, a first hatch, a second hatch, a delivery apparatus, a discharge device, and a heating apparatus. The delivery apparatus transports the vacuum apparatus from the first accommodating room to the vacuum room to the second accommodating room. The discharge device discharges a sealing element to seal an exhaust through hole of the vacuum apparatus. The heating apparatus is mounted on the inner wall of the vacuum room between the second hatch and the transport pipeline to heat and soften the sealing element.

Abstract: A method for making a field emission device includes the following steps. An insulative substrate is provided. An electron pulling electrode is formed on the insulative substrate. A secondary electron emission layer is formed on the electron pulling electrode. A first dielectric layer is fabricated. The first dielectric layer has a second opening to expose the secondary electron emission layer. A cathode plate having an electron output portion is provided. An electron emission layer is formed on part surface of the cathode plate. The cathode plate is placed on the first dielectric layer. The electron output portion and the second opening have at least one part overlapped, and at least one part of the electron emission layer is oriented to the secondary electron emission layer via the second opening.

Abstract: A field emission device includes an insulative substrate, an electron pulling electrode, a secondary electron emission layer, a first dielectric layer, a cathode electrode, and an electron emission layer. The electron pulling electrode is located on a surface of the insulative substrate. The secondary electron emission layer is located on a surface of the electron pulling electrode. The cathode electrode is located apart from the electron pulling electrode by the first dielectric layer. The cathode electrode has a surface oriented to the electron pulling electrode and defines a first opening as an electron output portion. The electron emission layer is located on the surface of the cathode electrode and oriented to the electron pulling electrode.