Field emission cathode based on carbon powder

Summary form only given. Carbon-based field emission cathodes have been demonstrated as viable candidates for vacuum electronics applications such as light sources, liquid crystal display (LCD) backlights and pictorial indicators. Cathodoluminescent light sources with field emission cathodes have numerous advantages such as reliability, high efficiency, short switching time and ecological compatibility. A micro-scaled field emission device includes a cathode electrode, an anode electrode and spacers, which separate cathode and anode electrodes. Phosphorus was sprayed on a glass plate, and it was used as an anode electrode. Fluoroplastic was used as spacer, because it is easy to handle its size and shape. Glass matrix with orifices was filled with carbon-based powder. Powder was rubbed in matrix orifices with the help of mechanical pressure. Characteristic of this cathode is shown on Fig.l. Constant positive voltage was applied to anode, and direct current in system was measured. A lot of factors influence on characteristic of cathode, and optimization of technological process is a priority problem. It is supposed that this design will be improved to triode construction to obtain better management of it. Furthermore, we can make glass plate of any size, therefore this device may be used as planar field emission cathode.