A scientist at the U.S. Department of Energys Brookhaven National Laboratory, working with colleagues at the IBM T.J. Watson Research Center, has caused an individual carbon nanotube to emit light for the first time. This step in research on carbon nanotubes may help to materialize many of the proposed applications for carbon nanotubes, such as in electronics and photonics development.
The light emission is the result of a process called "electron-hole recombination." By running an electric current through a carbon nanotube -- a long, hollow cylindrical molecule that is only one and a half nanometers (a billionth of a meter) in diameter -- negatively charged electrons in the nanotube molecule combine with positively charged "holes," which are locations in the molecule where electrons are missing. When an electron fills a hole, it emits a photon -- a tiny burst of light.
"We produced infrared light by applying voltages to a specific type of nanotube such that many electrons and holes end up in the nanotube, where they combine. This makes the nanotube the worlds smallest electrically-controllable light emitter," said James Misewich, a materials scientist at Brookhaven. "Its an exciting result, and my colleagues and I plan to continue studying the effect to determine the mechanisms behind it. For example, we hope to understand how to make the nanotubes emit other types of light, such as visible light, and how to increase the efficiency of the emission."
Karen McNulty Walsh | BNL
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