Photoluminescence from silicon nanoparticles prepared from bulk amorphous silicon monoxide by the disproportionation reaction

We report on strong photoluminescence of Si-based materials produced in large quantities. This is achieved by the disproportionation action of commercial bulk silicon monoxide at temperatures above 850 degrees C which results in the formation of Si nanocrystals surrounded by an amorphous silicon oxide matrix. High-resolution electron microscopy investigations reveal a broad size distribution of the silicon nanocrystals with a maximum at 4-4.5 nm, for samples annealed at 900 and 950 degrees C. X-ray diffraction and photoluminescence spectra indicate the coexistence of amorphous Si clusters in the samples, that have not fully undergone the amorphous/crystalline transition. This method could be suitable for the production in large quantities of Si-based bulk photoluminescent materials. (c) 2005 American Institute of Physics.