Bright Infrared Emission from Electrically Induced Excitons in Carbon Nanotubes
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- 18 November 2005
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 310 (5751) , 1171-1174
- https://doi.org/10.1126/science.1119177
Abstract
We used the high local electric fields at the junction between the suspended and supported parts of a single carbon nanotube molecule to produce unusually bright infrared emission under unipolar operation. Carriers were accelerated by band-bending at the suspension interface, and they created excitons that radiatively recombined. This excitation mechanism is ∼1000 times more efficient than recombination of independently injected electrons and holes, and it results from weak electron-phonon scattering and strong electron-hole binding caused by one-dimensional confinement. The ensuing high excitation density allows us to observe emission from higher excited states not seen by photoexcitation. The excitation mechanism of these states was analyzed.Keywords
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