A new electroluminescent conjugated polymer consisting of 2,2'-bipyridylenevinylene (BPyV) and 2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PV) moieties (BPy-MEH-PV), was synthesized by incorporating an n-dope type moiety, BPyV, and a p-dope type moiety, MEH-PV, into the polymer chain. This facile method provides a new approach to the synthesis of conjugated polymers with balanced ability of conducting electrons and holes. PBy-MEH-PPV exhibits tunable optical properties through protonation, and the emissive color can be progressively changed from orange to deep red depending on the degree of protonation.