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Role of decoupled defect transitions of ZnO nanocrystals in energy transfer

Paper ID Volume ID Publish Year Pages File Format Full-Text
27209 44009 2014 7 PDF Available
Title
Role of decoupled defect transitions of ZnO nanocrystals in energy transfer
Abstract

•Synthesized ZnO nanocrystals (NCs) show only visible emission due to defect transitions.•At least three defect transitions are responsible for the entire visible emission.•Visible emission of ZnO NCs is quenched unevenly in the presence of Rhodamine B (RhB).•Decoupled defect transitions of NCs interact independently with the RhB molecules resulting in nonuniform quenching of the NC fluorescence.

We examine the quenching of the visible emission of zinc oxide (ZnO) nanocrystals (NCs) in the presence of Rhodamine B (RhB) molecules. Spectroscopic measurements reveal that the quenching is nonuniform over the entire emission envelope and this quenching could be explained by the energy transfer from NCs to RhB molecules under Förster formalism. Analysis of the steady state and time-resolved emission data of ZnO NCs demonstrate that at least three defect transitions are associated with the visible emission of ZnO NCs. These transitions are completely decoupled and thereby interact individually with the RhB molecules resulting in wavelength dependent energy transfer and hence uneven quenching of the NC fluorescence. Moreover, we determine the parameters for fluorescence resonance energy transfer (FRET) from NCs to RhB molecules.

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Keywords
ZnO NCs; Defect transitions; Trap states; Time-resolved fluorescence; FRET; TCSPC
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Role of decoupled defect transitions of ZnO nanocrystals in energy transfer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 278, 15 March 2014, Pages 46–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us