研究目的

To introduce and explain the general phenomenon of excitation energy transfer, including radiative and nonradiative types, and to derive the basic processes of energy transfer with a focus on F?rster resonance energy transfer (FRET), Dexter energy transfer, charge transfer, exciton diffusion, and exciton dissociation. Additionally, to summarize the modifications of FRET when using nanostructures with mixed dimensionalities and in different assemblies.

研究成果

Energy transfer is a directional process that occurs from the excited energy state of a donor to the ground energy state of an acceptor. The energy transfer can be radiative or nonradiative, with the latter not involving real photon emission. Nonradiative energy transfer requires the emission spectrum of the donor to overlap with the absorption spectrum of the acceptor, leading to resonance energy transfer (RET). The F?rster resonance energy transfer (FRET) is a result of long-range dipole–dipole interactions between a donor and acceptor pair, differing from the Dexter process which allows for charge transfer. The efficiency of energy transfer depends on several factors including spectral overlap, donor quantum yield, spatial distance, and orientation of transition dipoles. The distance dependency of FRET varies with the dimensionality of the acceptor nanostructure.

研究不足

The chapter focuses on theoretical aspects and does not provide experimental data or specific limitations of the discussed energy transfer processes.