| Autor: |
Arao Nakamura, Takeshi Koyama, Hideo Kishida, Naoki Hikosaka, Yahachi Saito, Koji Asaka |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
The Journal of Physical Chemistry Letters. 2:127-132 |
| ISSN: |
1948-7185 |
| DOI: |
10.1021/jz101635n |
| Popis: |
Excitation energy transfer is a long-lasting issue in the fields of photoscience and materials science encompassing physics, chemistry, and biology. We report femtosecond energy transfer of quasi-one-dimensional excitons in single-walled carbon nanotube bundles, which we investigate using time-resolved luminescence spectroscopy. Luminescence decay times are found to increase with decreasing photon energy from 1.2 to 0.6 eV. The energy-dependent decay behavior is analyzed using a simple rate equation based on the measured diameter distribution of the tubes. The rate of exciton energy transfer per nanotube from an excited semiconducting tube to adjacent semiconducting tubes [1.8−1.9(±0.2) × 1012 s−1] is 1.6 times that of transfer to adjacent metallic tubes [1.1(±0.2) × 1012 s−1]. The observed transfer rates are much lower than those predicted by the Forster model. This finding provides insight into the energy-transfer mechanisms of one-dimensional excitons. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
