Field emission cathode
AssigneeLightlab Sweden AB
InventorQiu-Hong Hu
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Abstract
The present invention relates to afield emission cathode, comprising an at least partly electrically conductive base structure, and a plurality of electrically conductive micrometer sized sections spatially distributed at the base structure, wherein at least a portion of the plurality of micrometer sized sections each are provided with a plurality of electrically conductive nanostructures. Advantages of the invention include lower power consumption as well as an increase in light output of e.g. a field emission lighting arrangement comprising the field emission cathode.
Claims19
A field emission cathode, comprising:
- an at least partly electrically conductive base structure;
- and
- a plurality of electrically conductive micrometer sized sections spatially distributed at the base structure,
- wherein
- at least a portion of the plurality of micrometer sized sections has a shape of polygonal or circular cylinders, an aspect ratio of at least 3:1, a diameter between 5-500 micrometers, and a length up to 10 millimeters,
- at least a portion of the plurality of micrometer sized sections each are provided with a plurality of electrically conductive nanostructures, the nanostructures including a nanowire having a length greater than 1000 nm and an aspect ratio greater than 20:1, and
- the nanostructures are provided on the outer tips of the micrometer sized sections.
A field emission arrangement, comprising:
- a field emission cathode comprising:
- an at least partly electrically conductive base structure;
- a plurality of electrically conductive micrometer sized sections spatially distributed at the base structure,
- wherein at least a portion of the plurality of micrometer sized sections each are provided with a plurality of electrically conductive nanostructures;
- an anode structure;
- and
- an evacuated envelope inside of which the anode structure and the field emission cathode are arranged.
Dependencies are inferred from the claim text.