US9324556B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9324556-B2 |
| Application number | US-201314424074-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 12, 2013 |
| Priority date | Aug 29, 2012 |
| Publication date | Apr 26, 2016 |
| Grant date | Apr 26, 2016 |
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A field electron emission film that is capable of being operated with low electric power and enhancing the uniformity in luminance within the light emission surface contains from 60 to 99.9% by mass of tin-doped indium oxide and from 0.1 to 20% by mass of carbon nanotubes. The film has a structure wherein grooves having a width in a range of from 0.1 to 50 mm are formed in a total extension of 2 mm or more per 1 mm 2 on a surface of the film, and carbon nanotubes are exposed on a wall surface of the grooves. After forming an ITO film containing carbon nanotubes on a substrate, grooves are formed on a surface of the ITO film, and the end portions of the carbon nanotubes exposed to the wall surface of the grooves are designated as an emitter.
Opening claim text (preview).
The invention claimed is: 1. A field electron emission film comprising from 60 to 99.9% by mass of tin-doped indium oxide and from 0.1 to 20% by mass of carbon nanotubes, having such a structure that grooves having a width in a range of from 0.1 to 50 μm are formed in a total extension of 2 mm or more per 1 mm 2 on a surface of the film, and carbon nanotubes are exposed on a wall surface of the grooves. 2. A field electron emission device comprising the field electron emission film according to claim 1 formed on a substrate. 3. A light emission device comprising the field electron emission device according to claim 2 , as a cathode electrode, and a structure as an anode being disposed to face the field electron emission device and containing an anode electrode and a fluorescent material, wherein a space between the field electron emission device and the anode is maintained in a vacuum. 4. A method for producing a field electron emission film according to claim 1 , comprising: coating a carbon nanotube dispersion liquid containing an organic indium compound, a tin alkoxide, tin-doped indium oxide particles, and carbon nanotubes, on a substrate, and heating the dispersion liquid to form a tin-doped indium oxide film containing carbon nanotubes; and then forming grooves having a width in a range of from 0.1 to 50 μm in a total extension of 2 mm or more per 1 mm 2 on a surface of the film in order to expose the carbon nanotubes on a wall surface of the grooves. 5. The method for producing a field electron emission film according to claim 4 , wherein a formation method of the grooves is mechanical grinding with abrasive grains.
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