A series of high molecular weight

readily soluble eopolymers of 9

9-dioctylfluorene with pyndine are synthesized by Suzuki polycondensation．The results indicate that the light-emitting color of the polymers could be midified by the introduction of pyridine units into the polynuorene backbone．The energy levels of the polymers are widened

and PL

EL spectra are blue-shifted by the introduction of the meta-pyfidine groups．However

the PL

EL spectra are red-shifted by the introduction of para-pyridine groups．The introduction of pyfidine units at 3

5- or 2

6-position into polyfluorene backbone significantly depresses the excimer formation．The intensity of excimer emission decreases with increasing 3

5-pyridine content．Narrow and pure blue EL emission is obtained for the copolymer with 3

5-pyridine content of 40 mol％．Therefore

meta-pyridine-co-fluorene copolymers ate promising blue-emitting electroluminescent materials.