Bright infrared emission from electrically induced excitons in carbon nanotubes

被引：294
作者：
Chen, J
Perebeinos, V
Freitag, M
Tsang, J
Fu, Q
Liu, J
Avouris, P
机构：
[1] IBM Corp, Thomas J Watson Res Ctr, Div Res, Yorktown Hts, NY 10598 USA
[2] Duke Univ, Dept Chem, Durham, NC 27708 USA
来源：
SCIENCE | 2005年 / 310卷 / 5751期
关键词：
D O I：
10.1126/science.1119177
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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 similar to 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.
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收藏
页码：1171 / 1174
页数：4
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