  We report on the production of nanodiamonds (NDs) with 70-80 nm size via bead
assisted sonic disintegration (BASD) of a polycrystalline chemical vapor
deposition (CVD) film. The NDs display high crystalline quality as well as
intense narrowband (7 nm) room temperature luminescence at 738 nm due to in
situ incorporated silicon vacancy (SiV) centers. The fluorescence properties at
room and cryogenic temperatures indicate that the NDs are, depending on
preparation, applicable as single photon sources or as fluorescence labels.
