Abstract:
A structure and method are provided to inhibit degradation to the electron beam of a field emitter device by coating the field emitter tip with a substance or a compound. The substance or compound acts in the presence of outgassing to inhibit such degradation. In one embodiment, the substance or compound coating the field emitter tip is stable in the presence of outgassing. In another embodiment, the substance or compound decomposes at least one matter in the outgassing. In yet another embodiment, the substance or compound neutralizes at least one matter in the outgassing. In a further embodiment, the substance or compound brings about a catalysis in the presence of outgassing.
Abstract:
A method for fabricating an electron emitter is provided. This emitter structure may be used to form individual emitters or arrays of emitters. The method is comprised of implanting energetic ions into a diamond lattice to form cones or other continuous regions of damaged diamond. These regions are more electrically conducting than the surrounding diamond lattice, and have locally sharp tips at or near the point of entry of the ion into the diamond. The tips may then also be additionally coated with a layer of a wide band-gap semiconductor. An electrically conducting material may also be placed in proximity to the tips to generate an electric field sufficient to extract electrons from the conducting tips into either the region above the surface, or into the wide band-gap semiconductor layer in contact with the tips. Electrical contact is made to the electrically conducting damage tracks and the electrical circuit may be completed with an electrically conducting material on the surface of the wide band-gap semiconductor or diamond, or in the ambient above the surface of the emitter. The surface of the wideband gap semiconductor or diamond may be chemically modified to enhance the emission of electrons from the surface.
Abstract:
In a field emission-type electron source (10), a strong field drift layer (6) and a surface electrode (7) consisting of a gold thin film are provided on an n-type silicon substrate (1). An ohmic electrode (2) is provided on the back surface of the n-type silicon substrate (1). A direct current voltage is applied so that the surface electrode (7) becomes positive in potential relevant to the ohmic electrode (2). In this manner, electrons injected from the ohmic electrode (2) into the strong field drift layer (6) via the n-type silicon substrate (6) drift in the strong field drift layer (6), and is emitted to the outside via the surface electrode (7). The strong field drift layer (6) has: a number of semiconductor nanocrystals (63) of nano-meter order formed partly of a semiconductor layer configuring the strong field drift layer (6); and a number of insulating films (64) each of which is formed on the surface of each of the semiconductor nanocrystals (63) and each having film thickness to an extent such that an electron tunneling phenomenon occurs.
Abstract:
An electron-emitting device having a small electron beam size is proposed. In order to provide a high definition image display device having high image quality by utilizing this type of electron-emitting device and an electron source, a cathode electrode (2) has an opening which is trenched in a portion thereof, and further, the depth at which the opening is trenched is deep at a peripheral portion of the opening bottom face, and shallow at a central portion of the opening bottom face. A surface of an electron-emitting material is formed in a portion deeper than a boundary surface between the cathode electrode and an insulating layer.
Abstract:
An electron emission film includes a matrix consisting essentially of amorphous carbon and fullerene-like structures consisting essentially of a two-dimensional network of six-membered carbon rings. The fullerene-like structures are dispersed in the matrix and partially project from the matrix. The weight ratio of amorphous carbon to the fullerene-like structures is about 50:50 to 5:95. Amorphous carbon contains nitrogen acting as a donor at a concentration of about 4×10−7 to 10 atom %.
Abstract:
A carbon fiber for a field electron emitter has a coaxial stacking morphology of truncated conical tubular graphene layers, each of which includes a hexagonal carbon layer and has a large ring end and a small ring end at opposite ends in the axial direction. The edges of the hexagonal carbon layers are exposed on at least part of the large ring ends. Since all the exposed edges function as electron emission tips, a large amount of emission current can be obtained.
Abstract:
A cold cathode is formed of carbon nitride. The cathode may include layers of boron nitride and diamond underlying the carbon nitride. The cathodes are made by reactive laser ablation or by sputtering. Electronic devices utilizing the carbon nitride cathodes are also described.
Abstract:
An electron field emission device is provided by placing a substrate in a reactor, heating the substrate and supplying a mixture of hydrogen and a carbon-containing gas at a concentration of about 8 to 13 per cent to the reactor while supplying energy to the mixture of gases near the substrate for a time to grow a first layer of carbon-based material to a thickness greater than about 0.5 micrometers, subsequently reducing the concentration of the carbon-containing gas and continuing to grow a second layer of carbon-based material, the second layer being much thicker than the first layer. The substrate is subsequently removed from the first layer and an electrode is applied to the second layer. The surface of the substrate may be patterned before growth of the first layer to produce a patterned surface on the field emission device. The device is free-standing and can be used as a cold cathode in a variety of electronic devices such as cathode ray tubes, amplifiers and traveling wave tubes.
Abstract:
A flat panel display device (50) includes magnetic field emitter elements (52). The emitter elements (52) include a dopant ferromagnetic material (56) used to produce a permanent magnet in the emitter elements (52). The permanent magnet in the emitter elements (52) generates a magnetic field (B) used to focus the electrons emitted from the tips of the emitter elements (52). The flat panel display device (50) further includes a voltage source (70) for producing an electric field (E) between a cathode electrode (54) having a gate electrode (58), and an anode electrode (60) having phosphor regions (62) disposed between black matrix regions (61). The magnetic field (B) provides a restoring magnetic force to collimate the electrons toward the phosphor regions (62) to produce a high brightness display.
Abstract:
A multi type electron emission element comprises a plurality of electrodes formed on a deposition surface of an insulating material and each having a conical portion of a single crystal, an insulating layer formed on the deposition surface and having openings respectively centered on the conical portions, and a deriving electrodes, part of which is formed near at least the conical portions, the deriving electrode being formed on the insulating layer.