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Excitation energy transfer rate from Langmuir Blodgett (LB) dye monolayers to silicon: Effect of aggregate formation

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>26/04/2010
<mark>Journal</mark>Chemical Physics Letters
Issue number4-6
Number of pages6
Pages (from-to)194-199
Publication StatusPublished
<mark>Original language</mark>English


Time-resolved emission spectra (TRES) and decay curves have been recorded from mixed LB oxacarbocyanine dye monolayers and stearic acid at different distances to the silicon surface. We observe interlayer energy transfer between monomers and dimers present in the monolayer competing directly with energy transfer to silicon at close distances. We resolve these competing processes by studying the TRES spectra and decompose them into their emission components. We found the energy transfer rate for the monomer to silicon to be double than that of the dimer at a distance of d similar to 5 nm to the silicon surface. The Forster radius for the energy transfer to silicon was estimated at 5.5 +/- 0.5 nm. (C) 2010 Elsevier B.V. All rights reserved.