Ultrafast Excitation Energy Transfer in Small Semiconducting Carbon Nanotube Aggregates

被引:52
作者
Lueer, Larry [1 ,2 ]
Crochet, Jared [3 ,4 ]
Hertel, Tobias [3 ]
Cerullo, Giulio [5 ]
Lanzani, Guglielmo [6 ,7 ]
机构
[1] Madrid Inst Adv Studies IMDEA Nanociencia, Madrid, Spain
[2] Politecn Milan, CNR, INFM ULTRAS, I-20133 Milan, Italy
[3] Univ Wurzburg, Inst Phys & Theoret Chem, D-97070 Wurzburg, Germany
[4] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
[5] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy
[6] Politecn Milan, Dept Phys, I-20133 Milan, Italy
[7] Politecn Milan, Ctr Nanosci & Technol IIT POLIMI, I-20133 Milan, Italy
关键词
carbon nanotubes; femtosecond spectroscopy; excitation energy transfer; optoelectronics; aggregates; chirality enrichment; excitons; PHOTOLUMINESCENCE; DYNAMICS; EXCITONS; SPECTRA;
D O I
10.1021/nn100674h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We study excitation energy transfer in small aggregates of chirality enriched carbon nanotubes by transient absorption spectroscopy. Ground state photobleaching is used to monitor exciton population dynamics with sub-10 fs time resolution. Upon resonant excitation of the first exciton transition in (6,5) tubes, we find evidence for energy transfer to (7,5) tubes within our time resolution (<10 fs). Excitation in the visible spectral range, where the second excitonic transitions occur, is followed by fast intratube relaxation and subsequent energy transfer, in particular from the (8,4) tube toward other tubes, the latter process occurring in less than 10 fs.
引用
收藏
页码:4265 / 4273
页数:9
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