A theoretical study was made of deep N vacancy levels and of small clusters of N di- and tri-vacancies, including the nearest-neighbor defects in one layer of graphite-like BN, by using the model pseudopotential and super-cell methods. Calculated spectra and oscillator strengths were used to interpret the local bands of optical absorption, luminescence and photoconductivity in pyrolytic BN; before and after irradiation with fast neutrons, protons and C ions (50 to 150keV).

Deep Levels of Nitrogen Vacancy Complexes in Graphite-like Boron Nitride. S.N.Grinyaev, F.V.Konusov, V.V.Lopatin: Physics of the Solid State, 2002, 44[2], 286-93