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The nitrogen-vacancy centre (NV) has drawn much attention for over a decade,yet detailed knowledge of the photophysics needs to be established. Undertypical conditions, the NV can have two stable charge states, negative (NV-) orneutral (NV0), with photo induced interconversion of these two states. Here, wepresent detailed studies of the ionization dynamics of single NV centres inbulk diamond at room temperature during illumination in dependence of theexcitation wavelength and power. We apply a recent method which allows us todirectly measure the charge state of a single NV centre, and observe itstemporal evolution. Results of this work are the steady state NV- population,which was found to be always < 75% for 450 to 610 nm excitation wavelength, therelative absorption cross-section of NV- for 540 to 610 nm, and the energy ofthe NV- ground state of 2.6 eV below the conduction band. These results willhelp to further understand the photo-physics of the NV centre.

Photo induced ionization dynamics of the nitrogen vacancy defect in diamond investigated by single shot charge state detection