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The content of nitrogen-vacancy (NV − ) colour centres in the nanodiamonds (DNDs) produced during the detonation of nitrogen-containing explosives was found to be 1.1 ± 0.3 ppm. This value is impressive for nanodiamonds of size < 10 nm with intentionally created NV −  centres. The concentration was estimated from the electron paramagnetic resonance as determined from the integrated intensity of the  g  = 4.27 line. This line is related with “forbidden” ∆ m  s  = 2 transitions between the Zeeman levels of a NV −  centre’s ground triplet state. Confocal fluorescence microscopy enables detection of the red photoluminescence (PL) of the NV −  colour centres in nanoscale DND aggregates formed from the 5-nm nanoparticles. Subwavelength emitters consisting of NV −  with sizes a few times smaller than the diffraction-limited spot are clearly distinguished. We have further observed an abrupt drop in the PL intensity when mixing and anti-crossing of the ground and excited states spin levels in NV −  occurs under an applied external magnetic field. This effect is a unique quantum feature of NV −  centres, which cannot be observed for other visible domain light-emitting colour centres in a diamond lattice.

Photoluminescence from NV− Centres in 5 nm Detonation Nanodiamonds: Identification and High Sensitivity to Magnetic Field