Process for preparing optically clear solution of quartz nanocrystals with short-wave luminescence

摘要

The preparation process of the present invention is characterized in that first silicon nanocrystals are prepared by electrochemical etching of silicon wafers yielding a porous-silicon layer with subsequent post-etching and ageing procedure. The layer of porous silicon is then mechanically removed for the crystalline substrate, yielding powder composed of large agglomerates of silicon nanocrystals. These agglomerates of silicon nanocrystals are then subjected to long-term stirring in a suitable organic solvent, which stirring process results in extraction of a clear solution of individual silicon nanocrystals exhibiting intensive and a long-term stable yellow photoluminescence.