Energy Transfer Dynamics in Organic Ionic isolation Lattice under Polariton Condensation Regime

Organic exciton-polariton systems offer a versatile platform for exploring light-matter interactions and collective effects at room temperature. In these systems, strong coupling between excitons and cavity photons forms hybrid quasiparticles-polaritons that combine photonic coherence with excitonic interactions. This hybridization can reshape molecular processes such as energy transport, enabling control beyond traditional Förster or Dexter mechanisms.

We investigate nonradiative excitonic energy transfer in strongly coupled organic microcavities using two donor-acceptor pairs: Rhodamine 3B-Nile Blue (R3B-NB) and Rhodamine 3B-Rhodamine 6G (R3B-R6G), each embedded in small-molecule ionic isolation lattices (SMILES). The SMILES framework enhances photoluminescence while preventing aggregation-induced quenching, allowing precise control of excitonic interactions. By coupling either the donor or acceptor exciton to the cavity mode, we probe how polariton formation influences transfer efficiency and directionality.

Steady-state, time-resolved, and momentum-resolved spectroscopy reveal enhanced energy transfer from R3B to NB or R6G compared to uncoupled films, with distinct modulation of dynamics near the polariton condensation threshold. These results highlight the interplay of molecular coherence, cavity dispersion, and exciton-reservoir dynamics in mediating energy transport in hybrid organic polariton systems.