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The formation of the nanocrystalline rocksalt ZnO (rs-ZnO) has been in situ studied by x-ray diffraction with synchrotron radiation at high pressure and high temperature. A number of rs-ZnO/MgO nanocomposites with preset grain size were synthesized at 7 GPa and 800 K starting from wurtzite ZnO nanoparticles or nanorods. The use of MgO matrix allowed us to recover metastable rs-ZnO in the nanocrystalline form at ambient pressure. The cathodoluminescence measurements demonstrated the blue shift in the luminescence of rs-ZnO nanocrystals down to 402–408 nm that can be attributed to the enhanced incorporation of point defects with lower activation energy.

High-pressure synthesis and luminescent properties of cubic ZnO/MgO nanocomposites