Synthesis and Characterization of Novel Amine-Contained Electroluminescent Polymer

A new type of processable electroluminescent polymer containing tertiary amine linkage was prepared by typical Wittig reaction between bis(4-formylphenyl) n-butylamine and diphosphonium salt. The resulting polymer was highly soluble in common organic solvents so that it could be spun-cast onto glass plate coated with ITO electrode to give highly transparent homogeneous thin film. The molecular weight of the polymer determined by gel permeation chromatography using polystyrene standards is Mn = 4,500, Mw = 11,600. The structure of the polymer was confirmed by IR, UV-visible, and 1H-and 13C-NMR spectroscopy. We observed successfully the electroluminescence peaked at around 530 nm from the device made of the synthesized polymer. The current-voltage (I-V) curves showed typical rectifying diode characteristic.