Temperature-Dependent Excitonic Decay and Multiple States in Single-Wall Carbon Nanotubes

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• 作者：Wyatt K. Metzger ; Timothy J. McDonald ; Chaiwat Engtrakul ; Jeffrey L. Blackburn ; Gregory D. Scholes ; Garry Rumbles ; Michael J. Heben
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：March 8, 2007
• 年：2007
• 卷：111
• 期：9
• 页码：3601 - 3606
• 全文大小：340K
• 年卷期：v.111,no.9(March 8, 2007)
• ISSN：1932-7455

文摘

We have performed steady-state photoluminescence, time-correlated single photon counting, and Ramanspectroscopy measurements on single-wall carbon nanotubes from 4 to 293 K. We observe novelphotoluminescence spectra that cannot be attributed to vibronic transitions and verify the existence and energylevels of weakly emissive excitonic states. By combining photoluminescence intensity and lifetime data, wedetermine how nonradiative and radiative excitonic decay rates change as a function of temperature andcontrast this with theoretical predictions. The results suggest that recombination kinetics are influenced bymultiple excitonic states, including a dark lower state.