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Exciton energy transfer in nanotube bundles

Photoluminescence is commonly used to identify the electronic structure of individual nanotubes. But, nanotubes naturally occur in bundles. Thus, we investigate photoluminescence of nanotube bundles. We show that their complex spectra are simply explained by exciton energy transfer between adjacent tubes, whereby excitation of large gap tubes induces emission from smaller gap ones via Forster interaction between excitons. The consequent relaxation rate is faster than non-radiative recombination, leading to enhanced photoluminescence of acceptor tubes. This fingerprints bundles with different compositions and opens opportunities to optimize them for opto-electronics.

preprint2007arXivOpen access
P. H. TanA. G. RozhinT. HasanP. HuV. ScardaciW. I. MilneA. C. Ferrari
cond-mat.mtrl-sci
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Open access7 authors1 topic
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P. H. TanA. G. RozhinT. HasanP. HuV. ScardaciW. I. MilneA. C. Ferrari

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