Photoluminescence from disorder induced states in individual single-walled carbon nanotubes
| Autor: | Achim Hartschuh, Maria Allegrini, Mark C. Hersam, Alexander A. Green, Hayk Harutyunyan, Tobias Gokus |
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| Rok vydání: | 2009 |
| Předmět: |
Thermal equilibrium
Nanotube Photoluminescence Materials science Condensed Matter::Other Exciton Carbon nanotube Metal adsorption Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Spectral line Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science Dark state law Atomic physics |
| Zdroj: | physica status solidi (b). 246:2679-2682 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.200982273 |
| Popis: | We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime and is not in thermal equilibrium with the bright state. |
| Databáze: | OpenAIRE |
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