Web Release Date: February 7,
Luminescence Depolarization Dynamics of Quantum Dots: Is It Hydrodynamic Rotation or Exciton Migration?
and
Unit for Nano Science & Technology, Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098, India, and Department of Physics, University of Durham, Durham, UK
Received: October 26, 2007
In Final Form: December 6, 2007
Abstract:
In this paper, we report a first attempt to explore photoluminescence (PL) depolarization dynamics (anisotropy), which essentially depicts rotational motion of CdS quantum dots (QDs) of different sizes, by picosecond-resolved time-correlated single-photon counting (TCSPC) and streak camera spectroscopic techniques. The possible interference of the internal exciton migration in the rotational motion of the QDs has been thoroughly investigated in the temperature range of 200-348 K. For the structural characterization of the QDs, optical absorption and emission spectroscopy, confocal microscopy, and dynamic light scattering (DLS) studies have been performed. The nature of the emission transition dipole of CdS QDs has also been examined by using polarization-gated steady-state emission spectroscopy. The present study demands an immense application in the field of bio-nanointerface to explore the hydrodynamic properties of a biological macromolecule.
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