TY - JOUR
T1 - Luminescence depolarization dynamics of quantum dots
T2 - Is it hydrodynamic rotation or exciton migration?
AU - Shankara Narayanan, S.
AU - Sarkar, Rupa
AU - Sinha, Sudarson Sekhar
AU - Dias, Fernando
AU - Monkman, Andy
AU - Pal, Samir Kumar
PY - 2008/3/6
Y1 - 2008/3/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=41749111358&partnerID=8YFLogxK
U2 - 10.1021/jp710354z
DO - 10.1021/jp710354z
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AN - SCOPUS:41749111358
SN - 1932-7447
VL - 112
SP - 3423
EP - 3428
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 9
ER -