Formation of optical centers in nanodiamond grains with narrow, near-infrared emission at room temperature is one of the\nmost important challenges nowadays. Our aim was to form a metal-related color center through the CVD growth process of\nnanodiamond. Previously undocumented photoluminescence (PL) system with 865 nm zero-phonon line (ZPL) and 2nm full\nwidth at half maximum (FWHM) was successfully created in nanodiamond grains.According to the detailed analysis of the spectral\nfeatures of the ZPL and quasilocal modes of the vibronic sideband, a complex center containingNi and Si atoms could be accounted\nfor these PL features. The inclusion of Ni and Si impurity atoms in the complex optical center was strengthened by micro-Raman\nspectroscopy performed in the frequency range due to quasilocal vibrations of the vibronic sideband.
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