Electronic excitation energy transfer between CdS quantum dots and carbon nanotubes |
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Authors: | A A Zarubanov K S Zhuravlev T A Duda A V Okotrub |
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Institution: | (1) Department of Analytical Chemistry, University of Salamanca, 37008 Salamanca, Spain;(2) Department of Inorganic Chemistry, University of Salamanca, 37008 Salamanca, Spain |
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Abstract: | Stationary and transient photoluminescence of CdS quantum dots deposited on silicon substrates and carbon nanotubes is investigated. The photoluminescence spectrum of quantum dots on a silicon substrate is dominated by a band originating from electron transitions between the quantum-confinement levels in the dots. When the quantum dots are deposited on carbon nanotubes, the intensity of this band decreases significantly. Furthermore, the kinetics of the photoluminescence decay becomes faster, which brings evidence of an additional channel for the quantum-dot deexcitation. The analysis of the experimental data demonstrates that the Förster energy transfer from CdS quantum dots to carbon nanotubes is most probably responsible for this channel. The efficiency of this process exceeds 60%. |
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