Synthesis, characterization, and photophysical studies of new blue light emitting segmented copolymers

A series of new segmented copolymers containing rn-phenylene in the chromop hore unit have been synthesized by Wittig condensation. They are readily so luble in organic solvents and have high photoluminescence quantum yields in chloroform. Face-to-face pi -stacking in the solid state is limited or pre vented by molecular nonlinearity due to the meta-linkage and by the presenc e of a bulky tert-butyl group in the chromophores. Single-layer electrolumi nescence devices with an ITO/polymer/Ca-Al configuration emitted in the blu e region (470-490 nrn) for all of these systems.