Abstract: The invention concerns elemental silicon emission devices. Devices according to the invention use elemental silicon nanoparticles as a material from which stimulated emissions are produced. Silicon nanoparticles efficiently produce emissions and act as a gain medium in response to excitation. The silicon nanoparticles of the invention, being dimensioned on an order of magnitude of one nanometer and having about 1 part per thousand or less larger than 1 nm, are an efficient emission source and forms the basis for many useful devices.

Abstract: Harmonic incident radiation is obtained from a silicon nanoparticle microcrystal or microcrystal film. The preferred film comprises silicon nanoparticles, dimensioned on the order of one nanometer, reconstituted into a device quality crystalline film. The microcrystal film emits the second harmonic of incident radiation for excitations in the range of about 600-1000 nm. A preferred device according to the invention includes a silicon nanoparticle microcrystal film formed on a substrate, such as silicon or glass. Crystals of the silicon nanoparticles, due to the harmonic response, also demonstrate the capability to serve as piezoelectric material and as an improved biological marker. Since the emission response of the silicon nanoparticle crystals will be influenced by surrounding electric fields, the microcrystals also provide for electrochromatic mapping of electric field distribution in general and in electronic devices.