"Porous silicon" refers to a type of silicon material that has tiny holes or pores throughout its structure. These pores allow liquids or gases to pass through the material easily. Full definition
In 1991 Aomar Halimaoui at France's National Telecommunications Research Centre in Grenoble and collaborators from Joseph Fourier University in Grenoble began to suspect that the flash of red - orange light he had noticed in earlier studies of the electrochemical oxidation of porous silicon by hydrochloric acid was a form of electroluminescence. (newscientist.com)
Spectroscopic studies at the institute found that light from porous silicon matched that from siloxene. (newscientist.com)
Other doubts came from researchers who had studied porous silicon in detail. (newscientist.com)