Journal
NANO LETTERS
Volume 9, Issue 5, Pages 1747-1751Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl803004m
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Funding
- Materials, Structure, and Device Center, one of the five centers of the Focus Center Research Program (FCRP)
- NSF/DMR [07-04197]
- China Scholarship Council
- Peking University CDY Scholarship
- NSFC [20828004]
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In this work, we carried out electroluminescence (EL) measurements on metallic single-walled carbon nanotubes (SWNTs) and compared the light emission from the suspended section with the on-substrate section along the same SWNT. In addition to the lowest excitonic emission for metallic SWNTs (M-11), a side peak was observed at an energy of 0.17-0.20 eV lower than the M-11 peak, which is attributed to a phonon-assisted sideband. Interestingly, this side peak was only observed from on-substrate sections but not from suspended sections. This is likely due to the higher electric field used in the EL measurement of on-substrate sections and the asymmetric surroundings for on-substrate SWNT sections. When the drain voltage is increased, either a blue shift or a red shift of the M-11 emission (up to +/- 20 meV) was observed in different suspended SWNTs. The red shift can be explained by the temperature-dependence of the M-11 transition energy, whereas the blue shift is surprising and has never been observed before. Some possible mechanisms for the blue shift are discussed.
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