Spin-flip excitation of molecules mediated by photoexcited silicon nanocrystals

Reference:

Goller, B., Polisski, S. and Kovalev, D., 2007. Spin-flip excitation of molecules mediated by photoexcited silicon nanocrystals. Physical Review B, 75 (7), 073403.

Related documents:

Official URL:

http://link.aps.org/doi/10.1103/PhysRevB.75.073403

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.

Export

Actions (login required)