Spin-flip excitation of molecules mediated by photoexcited silicon nanocrystals

B Goller, S Polisski, D Kovalev

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.
Original languageEnglish
Article number073403
JournalPhysical Review B
Volume75
Issue number7
DOIs
Publication statusPublished - 2007

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