Local-field correction for a nanosource in a crystal

Summary form only given. We present a self-consistent calculation of the local-field correction experienced by an interstitial nanosource in a crystal with cubic symmetry. The local-field correction is obtained from a rigorous description of spontaneous emission which includes the Purcell effect and the dipole-dipole coupling between the source and the host. This rigorous description is used as a reference theory to devise simpler approaches to the local-field problem that can be applied to a wider range of crystal symmetries.