In Fig. , an initial substantial decrease in the UP population is observed, accompanied by a sharp increase in the dark state population and a slower rate of increase in the ground state population. The population transfer from the UP to the dark state is mediated by exciton-phonon coupling, and the population transfer to the ground state is attributed to cavity loss. Here, with a high Q, it is evident that exciton-phonon coupling has more influence on the decay of the initial UP population than cavity loss. For a broadband LP excitation shown in Fig. , an initial substantial decrease in the LP population is observed, and the rate of population transfer from LP to the ground state is similar to the rate of population transfer from LP to the dark states.