Photoinduced Dark Fraction Due to Blinking and Photodarkening Probability in Aqueous CdTe Quantum Dots

Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1657

Title:	Photoinduced Dark Fraction Due to Blinking and Photodarkening Probability in Aqueous CdTe Quantum Dots
Authors:	Murthy, A. V. R. Patil, Padmashri DATTA, SHOUVIK PATIL, SHIVPRASAD Dept. of Physics
Keywords:	Blinking and Photodarkening Aqueous CdTe Quantum Dots Emission wavelength Fluorescence Correlation Spectroscopy 2013
Issue Date:	Jun-2013
Publisher:	American Chemical Society
Citation:	Journal of Physical Chemistry C, 117 (25), 13268-13275.
Abstract:	We provide a novel approach to measure the photoinduced dark fraction due to blinking in semiconductor quantum dots in dilute aqueous solution using fluorescence correlation spectroscopy. We find that below certain threshold excitation intensity, addition of β-mercaptoethanol (BME) does not have a measurable effect on the average number of luminescent quantum dots in a diffraction-limited detection volume. However, above this threshold, it was found to increase and saturate with increasing BME concentration. From these measurements we calculated the photoinduced dark fraction due to blinking and the probability of quantum dot entering into a dark state upon photon absorption (∼10–6).
URI:	http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1657 https://doi.org/10.1021/jp402792f
ISSN:	1932-7447 1932-7455
Appears in Collections:	JOURNAL ARTICLES

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