Stable solid state electroluminescent devices, based on one- and two- dimensional silicon structures were fabricated. One- dimensional structures were in the form of silicon nanopillars on a silicon substrate, fabricated by using lithography and etching techniques. Isolation and planarization of nanopillars was made by using polymethyl methacrylate (PMMA), which is a non conducting polymer, totally transparent in the visible region. Gold (Au) was used as top contact metal and the back ohmic contact was based on aluminum. Zero-dimensional structures were in the form of silicon nanocrystallites, deposited by low pressure chemical vapour deposition (LPCVD) on a thin SiO2 layer, thermally grown on silicon. Gold and aluminum were also used as contact metals. In both cases the devices showed stable electroluminescence at room temperature, visible with the naked eye. Devices based on nanocrystallites showed more uniform emission. The onset of light emission was between 5 and 7 Volts. The devices were checked for several hours of continuous operation and no degradation was observed.