QD simulations were performed by initializing the system in the excited state as a Gaussian photon-nuclear wavepacket center at R = 2.0 a 0 and q = 0 with zero momentum. Since the system starts in the lower vibrational level of the electronic excited state and the nonadiabatic coupling to the ground state is negligible, the only possible decay pathway is via a radiative decay, achievable within the time of our simulations in the strong-coupling regime.