US Patent 8076836 - CNT light source

http://www.freepatentsonline.com/8076836.html

This patent from Hon Hai Precision (Foxconn) is based on the finding that carbon nanotube films formed with varying density emit polarized light when a current is applied. Claim 7 reads:

7. A light source comprising:

a carbon nanotube film comprising a plurality of first areas and a plurality of second areas, the first areas and the second areas each comprising a plurality of successively oriented carbon nanotubes joined end-to-end by Van der Waals attractive force therebetween, wherein the first areas and the second areas have different densities of carbon nanotubes; and

two electrodes electrically connected to the carbon nanotube film.