摘要:
A field emission device (5) includes cathodes (51), emitters (52) formed on the cathodes, grid electrodes (54) formed over the cathodes at a distance apart from the emitters respectively, and an isolated film (55) formed on first surfaces of each two neighboring grid electrodes. Preferably, the isolated film has a thickness ranging from 0.1 to 1 microns. The isolated film may be a film made of one or more insulating materials, such as SiO2 and Si3N4. Alternatively, the one or more insulating materials can be selected from a material having a high secondary electron emission coefficient, such as MgO, Al2O3, and ZnO. Additionally, the isolated film can be further formed on a second surface of the grid electrode apart from the emitter.
摘要翻译:场发射器件(5)包括阴极(51),形成在阴极上的发射器(52),分别形成在阴极上方的栅电极(54),隔离膜(55),第一 每个两个相邻栅格电极的表面。 优选地,隔离膜的厚度为0.1至1微米。 隔离膜可以是由一种或多种绝缘材料制成的膜,例如SiO 2和Si 3 N 4 N 4。 或者,一种或多种绝缘材料可以选自具有高二次电子发射系数的材料,例如MgO,Al 2 O 3 3和ZnO。 此外,隔离膜可以进一步形成在除发射极之外的栅电极的第二表面上。
摘要:
An emitter includes an electrode, and a number of carbon nanotubes fixed on the electrode. The carbon nanotubes each have a first end and a second end. The first end is electrically connected to the substrate and the second end has a needle-shaped tip. Two second ends of carbon nanotubes have a larger distance therebetween than that of the first ends thereof, which is advantageous for a better screening affection. Moreover, the needle-shaped tip of the second ends of the carbon nanotube has a lower size and higher aspect ratio than the conventional carbon nanotube, which, therefore, is attributed to bear a larger emission current.
摘要:
An electron emission apparatus includes an insulating substrate, one or more grids located on the substrate, wherein the one or more grids includes: a first, second, third and fourth electrode that are located on the periphery of the grid, wherein the first and the second electrode are parallel to each other, and the third and fourth electrodes are parallel to each other; and one or more electron emission units located on the substrate. Each the electron unit includes at least one electron emitter, the electron emitter includes a first end, a second end and a gap; wherein the first end is electrically connected to one of the plurality of the first electrodes and the second end is electrically connected to one of the plurality of the third electrodes; two electron emission ends are located in the gap, and each electron emission end includes a plurality of electron emission tips.
摘要:
A field emission electron source having carbon nanotubes includes a CNT string and a conductive base. The CNT string has an end portion and a broken end portion. The end portion is contacted with and electrically connected to the surface of the conductive base. The CNTs at the broken end portion form a tooth-shape structure, wherein some CNTs protrude and higher than the adjacent CNTs. Each protruded CNT functions as an electron emitter.
摘要:
A field emission cathode device includes an insulative substrate, a number of cathode electrodes, and a number of liner electron emission units. The insulative substrate has a top surface and a bottom surface. The insulative substrate defines a number of openings. The cathode electrodes are located on the bottom surface. Each of the linear electron emission units has a first portion secured between the insulative substrate and one corresponding cathode electrode and a second portion received in one corresponding opening.
摘要:
A field emission display includes a field emission cathode and an anode electrode plate arranged above the field emission cathode. The filed emission cathode includes a substrate, and a plurality of electron-emitting areas spaced apart from each other and arranged on the substrate. Each of the electron-emitting areas includes a cathode, a gate electrode, and a number of first and second conductive lines. The cathode includes a first conductive substrate and a first carbon nanotube assembly having a plurality of carbon nanotubes each having a cathode emitting end having a needle-shaped tip. The gate electrode is faced to the cathode emitting end. The taper-shaped tips of the cathode emitting ends and the gate have a small size and higher aspect ratio, allowing them to bear a larger emission current at a lower voltage.
摘要:
A field emission lamp generally includes a bulb having an open end, a lamp head disposed at the open end of the bulb, an anode, and a cathode. The anode includes an anode conductive layer formed on an inner surface of the bulb, a fluorescent layer deposited on the anode conductive layer, and an anode electrode electrically connected with the anode conductive layer and the lamp head. The cathode includes an electron emission element and a cathode electrode electrically connected with the electron emission element and the lamp head. The electron emission element has an electron emission layer. The electron emission layer includes getter powders therein to exhaust unwanted gas in the field emission lamp, thereby ensuring the field emission lamp with a high degree of vacuum during operation thereof. A method for making such field emission lamp is also provided.
摘要:
A method for manufacturing a field emission electron source includes: (a) Providing a carbon nanotube (CNT) film, the CNT film has a plurality of CNTs, the CNTs are aligned along a same direction; a first electrode and a second electrode. (b) Fixing the two opposite sides of the CNT film on the first electrode and the second electrode, the CNTs in the CNT film extending from the first electrode to the second electrode. (c) Treating the CNT film with an organic solvent to form at least one CNT string. (d) Applying a voltage between two opposite ends of the CNT string until the CNT string snaps, thereby at least one CNT needle, the CNT needle has an end portion and a broken end portion. (e) Securing the CNT needle to a conductive base by attaching the end portion of the CNT needle to the conductive base.
摘要:
A field emission electron source includes at least one electron emission member. Each electron emission member includes a conductive body and an electron emission layer formed on the conductive body. The conductive body has an upper portion. The electron emission layer is formed on, at least, the upper portion of the conductive body. The electron emission layer includes a glass matrix; and at least one carbon nanotube, and a plurality of metallic conductive particles and getter powders dispersed in the glass matrix. A method for making such field emission electron source is also provided.
摘要:
A field emission lamp includes a transparent glass tube, a cathode, and an anode. The anode and cathode are both disposed in the transparent glass tube. The cathode includes an electron emission layer. The anode includes a carbon nanotube transparent conductive film formed on an inner wall of the transparent glass tube and a fluorescent layer formed on the carbon nanotube transparent conductive film. A method for fabricating the above-described field emission lamp, includes the steps of: (a) providing a transparent glass tube including at least one conductive wire, a carbon nanotube transparent conductive film and a fluorescent layer formed on the inner wall thereof; and (b) providing an anode electrode, a cathode electrode, a cathode emitter sealed by feedthroughs in the glass tube to achieve the field emission lamp.