Abstract
Investigation of visible light excited photoluminescence (PL) in HPHT synthetic diamonds, grown in the Ni-containing melt, revealed a variety of new systems. The PL excitation spectra were recorded for the most intense systems and position of zero-phonon lines and energies of participating phonons were determined. Analysis of PL versus annealing temperature T and ESR data allowed one to establish a sequence of nickel defect transformations as T increases. Only PL systems related to complicated nickel-nitrogen complexes with number of nitrogen atoms n ≥ 2 were found in natural diamonds.
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