Polymer light-emitting diodes with red and green emissions were fabricated on the same indium-tin oxide (ITO) substrate. The basic device structure is ITO/electroluminescent polymer/Al. The polymer light-emitting layer of the dual-color device fabricated in this work has two parts, one part is the single (poly[2,5-dimethyldodecylsilyl-1,4-phenylenevinylene]) (Si-PPV) film, and the other part consists of the hybrid films of Si-PPV and cyano-substituted poly[2,5-didecyloxy-1,4-phenylenevinylene] prepared by a simple two-step spin-coating method. The device characteristics have been investigated, and the possible electroluminescent mechanisms were discussed. (C) 2007 Elsevier B.V. All rights reserved.