9,9-Dialkylfluorenevinylene-based electroluminescence (EL) polymers, poly(9,9-di-n-octylfluorenyl-2,7-vinylene) poly(FV) and poly[(9,9-di-n-octylfluorenyl-2,7-vinylene)-co-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene}] poly(FV-co-MEHPV), have been synthesized by the Gilch polymerization method. The structure and properties of those polymers were characterized using 1H, 13C NMR, UV−vis spectroscopy, elemental analysis, GPC, DSC, TGA, photoluminescence (PL), and EL spectroscopy. The 9,9-dialkylfluorenevinylene-based EL polymers were soluble in common organic solvents and easily spin-coated onto the indium−tin oxide (ITO)-coated glass substrates. The weight-average molecular weight (Mw) and polydispersity of poly(FV) and poly(FV-co-MEHPV) were in the range (22.2−43.2) × 104 and 1.9−3.0, respectively. Double-layer light-emitting displays (LEDs) with an ITO/PEDOT/polymer/Al configuration were fabricated, and the devices using poly(FV-co-MEHPV) showed better EL properties than those using pure poly(FV) ...