Poly(3,6-silafluorene) is a typical wide band-gap conjugated polymer with ultraviolet light emission. The blue electroluminescence from the 3,6-silafluorene-based copolymers via intrachain energy transfer was reported in this study. The monomer containing vinylene, anthracene, and tri-arylamine moieties incorporated into the poly(3,6-silafluorene) backbone can form efficient deep-blue emitting copolymers with EL efficiency of 1.1-1.9%. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3286-3295, 2009