Patent ID: 8853932

Claim:
A device comprising: a filament that includes carbon nanotubes, the carbon nanotubes comprising multiwall carbon nanotubes, wherein the device is configured to produce light with a luminary characteristic having a first value, wherein the first value is higher than a second value of the luminary characteristic of a device having an uncoated filament at a same operating condition; and a catalyst on the filament, the catalyst having a thickness in a range from about 50 nm to about 200 nm, and the filament having a diameter in a range from about 0.0030 cm to about 0.0102 cm; wherein the filament is located in a sealed housing, an atmosphere in the housing at a pressure below 10 −2 mbar; and wherein the filament is selected from a group consisting of a continuous flat multifilaments, continuous twisted multifilaments, and continuous textured multifilaments.