Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 4, Pages 597-602Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2010.10.037
Keywords
MPA-CdTe QDs; Anthraquinone dyes; Fluorescence quenching; Electron transfer
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Funding
- DST, Government of India [SR/NM/NS-16/2007]
- CSIR, Government of India [01(2217)/08/EMR-II]
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Photoinduced interaction of mercapto propionic acid (MPA) capped CdTe quantum dots (QDs) with certain anthraquinone dyes namely alizarin, alizarin red S, acid blue 129 and uniblue has been studied by steady state and time resolved fluorescence measurements. Addition of anthraquinone dyes to CdTe QDs results in the reduction of electron hole recombination has been observed (i.e., fluorescence quenching). The Stern-Volmer constant (K-SV), quenching rate constant (k(q)) and association constants (K) were obtained from fluorescence quenching data. The interaction of anthraquinone dyes with QDs occurs through static quenching was confirmed by unaltered fluorescence lifetime. The occurrence of electron transfer quenching mechanism has been proved by the negative free energy change (Delta G(et)) obtained as per the Rehm-Weller equation. (C) 2010 Elsevier B.V. All rights reserved.
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