  Quantum batteries, quantum systems for energy storage, have gained interest
due to their potential scalable charging power density. A quantum battery
proposal based on the Dicke model has been explored using organic
microcavities, which enable a cavity-enhanced energy transfer process called
superabsorption. However, energy storage lifetime in these devices is limited
by fast radiative emission losses, worsened by superradiance. Here, we
demonstrate a promising approach to extend the energy storage lifetime of Dicke
quantum batteries using molecular triplet states. We examine a type of
multi-layer microcavities where an active absorption layer transfers energy to
the molecular triplets of a storage layer, identifying two regimes based on
exciton-polariton resonances. We tested one of these mechanisms by fabricating
and characterising five devices across a triplet-polariton resonance. We
conclude by discussing potential optimisation outlooks for this class of
devices.
