This paper describes the development of light emitting diode (LED) technology based on fluorene-containing polymers, prepared through the coupling of 9,9-disubstituted 2,7-bis-1,3,2-dioxaborolanyl fluorine with a variety of aromatic dibromides. In these polymers the poly phenylene-like backbone provides the mechanical and chemical robustness and the C-9 of fluorene provides a site for physical property modifications without introducing significant torsional strain which would adversely affect conjugation. Polymer optical and electronic properties are tailored through selective incorporation of different aromatic unit into the AB alternating structure. LED devices emitting in blue, green, red and other colors are thus obtained.