Photonic effects on the Förster resonance energy transfer efficiency

Freddy T. Rabouw, Stephan A. den Hartog, Tim Senden and Andries Meijerink ()
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Freddy T. Rabouw: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University
Stephan A. den Hartog: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University
Tim Senden: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University
Andries Meijerink: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Förster resonance energy transfer (ET) between luminescent species is applied in bio-imaging, lighting and photovoltaics, and has an important role in photosynthesis. However, the fundamental question of whether ET rates and efficiencies can be tuned by the photonic environment remains under debate. Here we show that ET rates are independent of the photonic environment, using the model system of LaPO4 nanocrystals co-doped with Ce3+ donors and Tb3+ acceptors. Although the radiative emission rate of the Ce3+ excited state increases with the refractive index of the solvent in which the nanocrystals are dispersed, the Ce3+-to-Tb3+ ET rate does not. We demonstrate that, as a result, lower refractive index solvents enable higher ET efficiencies leading to higher Tb3+ emission intensities. Furthermore, an analytical model for ET in (nano)crystalline host materials is presented, able to predict the dependence of ET efficiencies on the photonic environment and the concentration of acceptor ions.

Date: 2014
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DOI: 10.1038/ncomms4610

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