D.J. Lockwood, Light Emission in Silicon. G. Abstreiter, Light Emission in Si/Ge Atomic Layer Structures. T.G. Brown and D.G. Hall, Radiative Isoelectronic Impurities in Silicon and SiliconGermanium Alloys and Superlattices. J. Michel, L.V.C. Assali, M.T. Morse, and L.C. Kimerling, Erbium in Silicon. Y. Kanemitsu, Silicon and Germanium Nanoparticles. P.M. Fauchet, Porous Silicon: Photoluminescence and Electroluminescent Devices. C. Delerue, G. Allen, and M. Lannoo, Theory of the Radiative and Non Radiative Processes in Silicon Nanocrystallites. L. Brus, Silicon Polymers and Nanocrystals.