Diformahriphenylamine and 1-methoxy-4-octoxyl-2

5-xylenebis(triphenyl phosphonium chloride)were synthesized

and their copolymer(TPA—MOPPV) was obtained through a Wittig polycondensation．The structures of the monomer and copolymer were characterized by FT-IR．UV-Vis．1H—NMR and fluorescence spectrum．The optical properties and thermal behavior were discussed in detml．A strong blue—greenish light

with 503 nm maximum wavelength

was observed for the copolymer in 0．01 g/L CHCl3 solution．Furthermore

concentrations on photoluminescence property of the polymer was investigated．The results showed that the maximum excitation wavelength was approximately 440 nm when the concentration of the copolymer was under 0．01 g／L．but the maximum excitation wavelength exceeded 492 nm after the concentration was above 0．01g/L．The copolymer is readily soluble in common organic solvents at room temperature

so it could be easy to prepare electroluminescent device by spin-coat technology．The electrochemical studies suggested the hole injection and hole transport properties could be improved because of introducing the triphenylamine units．Its electroluminescence properties were investigated．a polymer light emitting diode with the TPA—MOPPV as the active layer(ITO／PEDOT：PSS／TPA-MOPPV／Ba／Al)showed greenish yellow emission with luminance over 369 cd／m2 at 6 V and the low turn—on voltage (3．2 V)

the maximum external quantum efficiency was 0．14％．DSC analysis showed that Tg of the polymer was 23 K higher than that of triphenylamine derivatives TPD

and the results of TG indicated that the decomposition temperature of TPA—MOPPV was 208℃ and the polymer did not displays apparent weight loss until 360℃．In a word

the polymer exhibits strong fluorescence

relatively hish thermal stability

good film—forming capability

high luminance

good hole—transporting property

being a good candidate of electroluminescent material．