Abstract
Composite polycrystalline diamond layers containing light-emitting Si nanoparticles (mean diameter: 3.6 and 6.2 nm) have been prepared by using a chemical-vapor deposition technique coupled with a powder-flowing apparatus. The room-temperature photoluminescence behavior of such material in the 1.6–2.5 eV energy range is found characterized by a strong increase of the emission efficiency from the Si nanostructures embedded in the diamond matrix. Moreover, the studies reveal that it is possible to tune the luminescence frequency in the yellow-green spectral region by selecting the size of the inserted Si grains.
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