Time-resolved magnetic field effects distinguish loose ion pairs from exciplexes.

ABSTRACT: We describe the experimental investigation of time-resolved magnetic field effects in exciplex-forming organic donor-acceptor systems. In these systems, the photoexcited acceptor state is predominantly deactivated by bimolecular electron transfer reactions (yielding radical ion pairs) or by direct exciplex formation. The delayed fluorescence emitted by the exciplex is magnetosensitive if the reaction pathway involves loose radical ion pair states. This magnetic field effect results from the coherent interconversion between the electronic singlet and triplet radical ion pair states as described by the radical pair mechanism. By monitoring the changes in the exciplex luminescence intensity when applying external magnetic fields, details of the reaction mechanism can be elucidated. In this wo

SUBMITTER: Richert S 

PROVIDER: S-EPMC3797520 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature