Couto & Kowalewski instead examined the nature of polariton-exciton internal conversion using a quantum nuclear wavepacket propagation method. Here, the Schrödinger equation, is solved numerically using the Chebychev method with the ground state being forced to the S 1 potential energy surface . Using meso-tertbutyl-boron-dipyrromethene as a case study, they found that changes in the energetic landscape and population transfer rates could easily be achieved through tuning of the cavity properties through analysis of the polartonic potentials and the resulting wavepackets, highlighting that the linchpin is the interplay between cavity resonance and field strength. Where ultra-strong coupling was observed, internal conversion was significantly damped, with the wavepacket being projected onto the ground state energetic surface, therefore drastically increasing the photoluminescence quantum yield of a given system.