Nano Archive

Luminescence depolarization dynamics of quantum dots: Is it hydrodynamic rotation or exciton migration?

Narayanan, S. Shankara and Sarkar, Rupa and Sinha, Sudarson Sekhar and Dias, Fernando and Monkman, Andy and Pal, Samir Kumar (2008) Luminescence depolarization dynamics of quantum dots: Is it hydrodynamic rotation or exciton migration? JOURNAL OF PHYSICAL CHEMISTRY C, 112 (9). pp. 3423-3428.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp710354z

Abstract

In this paper, we report a first attempt to explore photoluminescence (PL) depolarization dynamics (anisotropy), which essentially depicts rotational motion of US 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 US 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.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Functional and hybrid materials
Biomedical Science > Nanobiotechnology
Physical Science > Photonics
ID Code:1850
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 14:35
Last Modified:12 Jan 2009 12:10

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