Abstract
Semi-rigid homo- and copoly(ester-imide)s were prepared from bismethyl ester of 3,3”,4,4”-p-terphenyltetracarboxdiimide and bisalcohols of 3,3’,4,4’-biphenyltetracarboxdiimide by melt polycondensation and their thermotropic liquid-crystalline, photo- (PL) and electroluminescent (EL) properties were investigated. Differential scanning calorimetry (DSC) measurements, polarizing microscope observations of textures and powder X-Ray analyses suggested that homopolymer having hexamethylene chain form monotropic smectic C or A phase and most of copolymers enantiotropic nematic phase. PL spectra showed that the polymers emitt blue light in the chloroform solutions and in the films. EL spectra of polymers in double-layer devices (ITO/poly(3,4-ethylene dioxythiophene) (PE DOT)/polymer/LiF or Ca/Al), with blue emission, were almost identical to the PL spectra, although luminances were very low. The poly(ester-imide)s can be used as blue light-emitting and/or electron-transporting materials for organic EL devices.
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