Study of optical properties of the NV and SiV centres in diamond at high pressures

We report photoluminescence studies of micro-and nano-sized diamonds with NV 0 , NV -and SiV -centers under hydrostatic pressure up to 50 GPa.Diamonds have been obtained by high-pressure high-temperature (HPHT) treatment of metal-free growth systems based on mixtures of hydrocarbon, fluorocarbon, and silicone-containing organic compounds.