  We report on the synthesis of hybrid light emitting particles with a diameter
ranging between 100 and 500 nm, consisting in a compact semiconductor
CdSe/CdS/CdZnS nanocrystal aggregate encapsulated by a controlled nanometric
size silica and gold layers. We first characterize the Purcell decay rate
enhancement corresponding to the addition of the gold nanoshell as a function
of the particle size and find a good agreement with the predictions of
numerical simulations. Then, we show that the contribution corresponding to
F\"orster resonance energy transfer is inhibited.
