Photoexcited silicon nanocrystals: mediators for the excitation of organic molecules

We report on spin‐flip activation of organic molecules from the ground state to one of the excited states having different electronic spin configurations. Based on photoexcitations in silicon (Si) nanocrystals, stored electronic energy can be transferred to other substances. The huge hydrogen passiv...

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Bibliographic Details
Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2009-06, Vol.206 (6), p.1295-1298
Main Authors: Goller, Bernhard, Polisski, Sergej, Kovalev, Dmitry
Format: Article
Language:English
Subjects:
33.50.Hv
71.35.Gg
78.67.Bf
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Physics
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Summary:We report on spin‐flip activation of organic molecules from the ground state to one of the excited states having different electronic spin configurations. Based on photoexcitations in silicon (Si) nanocrystals, stored electronic energy can be transferred to other substances. The huge hydrogen passivated surface being accessible for acceptor molecules, the tunable confinement energy of excitons and their very long radiative lifetime allow Si nanocrystals to act efficiently as photosensitizers. We demonstrate that the energy transfer is governed by electron exchange mechanism. Therefore a good overlap of the electron wave functions, of donor and acceptor, is crucial for the efficiency of this type of interaction. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.200881058