Spin-flip excitation of molecules mediated by photoexcited silicon nanocrystals

B. Goller, S. Polisski, and D. Kovalev
Phys. Rev. B 75, 073403 – Published 6 February 2007

Abstract

Spin-flip excitation of molecules by photons is forbidden in the dipole approximation. Usually it requires the presence of a light-absorbing donor which subsequently transfers energy of electronic excitation to an acceptor molecule. Here we report on a specific type of spin-flip excitation process based on assemblies of silicon nanocrystals. This system has a highly developed surface being accessible for organic molecules, tunable energy of excitons due to quantum confinement effects, and a very long radiative lifetime of indirect excitons. These factors are found to be critical for achieving highly efficient energy transfer from excitons confined in Si nanocrystals to a variety of organic molecules. We show that energy transfer is governed by electron exchange mechanism.

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  • Received 3 November 2006

DOI:https://doi.org/10.1103/PhysRevB.75.073403

©2007 American Physical Society

Authors & Affiliations

B. Goller, S. Polisski, and D. Kovalev

  • Physics Department, University of Bath, Bath BA2 7AY, United Kingdom

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Issue

Vol. 75, Iss. 7 — 15 February 2007

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