Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 23: Progress on Various Topics in Molecular Physics

MO 23.3: Vortrag

Freitag, 27. März 2015, 11:30–11:45, PH/SR106

Tuning the non-radiative lifetime of molecular aggregates via the dipole-dipole interaction — •Alan Celestino and Alexander Eisfeld — MPIPKS, Dresden, Germany

Non-radiative transitions lead in many molecules to a relaxation from the electronic excited to the ground state on a time scale faster than that of spontaneous emission. Therefore the excitonic lifetime in those molecules is limited by their non-radiative transition channels. Depending on the application in mind one would like to tune these lifetimes (making them longer or shorter). Here we show that aggregation of such molecules strongly influences the non-radiative lifetime. By varying the dipole-dipole interaction between the molecules one can either enhance the the non-radiative lifetime or even totally suppress it. We study in detail a molecular dimer. The monomer is modeled as a two electronic level system coupled to a single nuclear coordinate (relevant nuclear coordinate). The remaining nuclear coordinates are taken into account as a Markovian bath coupled to the relevant nuclear coordinate. The two electronic potential surfaces are coupled via a non-radiative well-localized exciton-decay channel. The dimer is composed by two dipole-dipole-interacting monomers. The dipole-dipole interaction leads to completely new dynamics and allows one to tune the excitonic lifetime.