Journal
JOURNAL OF LUMINESCENCE
Volume 203, Issue -, Pages 67-73Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2018.06.012
Keywords
ZnSe/ZnS quantum dots; FRET; Acceptor dipole moment; Surface states, coumarin laser dyes; Quenching
Categories
Funding
- University Grants Commission (UGC), New Delhi, India under Centre with Potential for Excellence in Particular Area (CPEPA) [8-2/2008(NS/ PE)]
Ask authors/readers for more resources
Herein we report efficient fluorescence resonance energy transfer (FRET) between heavy metal free core-shell ZnSe/ZnS quantum dots (QDs as donors) and coumarin 540A (C540A), coumarin 515 (C515) and coumarin 519 (C519) laser dyes (as acceptors) using multiple spectroscopic techniques which interestingly provides a strong evidence for its dependence on acceptor dipole moment. The results also reveal that the coumarin dye acceptors, especially the C519 probe, significantly quench the photoluminescence intensity of QDs. Remarkably high energy transfer efficiencies similar to 85% in the QDs-0519 FRET pairs are noted which demonstrate that acceptor dipole moment could be associated with energy transfer via strong electrostatic dipole-dipole interaction. The FRET efficiency was investigated as function of QDs size and surface chemistry conditions. Interestingly, the nonlinear dependence of FRET efficiency on the spectral overlap was observed contradictory to the Forster's theory. This nonlinearity might be due to role of QDs surface states and acceptor dipole moment. The current work is not only expected to provide useful information about the interaction between inorganic and organic hetero-structured probes via FRET mechanism but also throws light on the role of acceptor dipole moment, surface states in addition to nonlinear dependence of transfer efficiency on spectral overlap.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available