We show a very easy method for synthesizing three-dimensional superlattices consisting of silicon (Si) clusters. The obtained superlattices were micrometer-sized single crystals of Si clusters. The packing structures of the superlattices were either face-centered cubic (FCC) or body-centered cubic (BCC). The Si superlattices showed strong visible light emission, whereby the color of luminescence was either blue-green or orange. (C) 2002 Elsevier Science B.V. All rights reserved.