A review of fabrication methods and optical properties of porous silic
on is presented. Intense luminescence of porous silicon in the visible
spectral range is due to the formation of quantum wires with diameter
s of 20-30 angstrom in the process of silicon anodization. Kinetics ex
periments on photoluminescence, which reveal a hierarchy of lifetimes
in this material, are discussed. Porous silicon is a promising materia
l for construction of LEDs compatible with silicon electronics.