Perylenediimides with electron transport moieties for electroluminescent devices

Low molecular weight and polymeric imides are synthesized by attaching pery lene units as substituents or by incorporating in aromatic main chain copol ymers to achieve high photoluminescent efficiency. In order to improve elec tron injection and transport properties 1,3,4-oxadiazole comonomers with hi gh electron affinities are used. The best solid state photoluminescence is obtained in copolymers with 0.5 mol% perylene content. The low molecular we ight compounds exhibit high electron affinity with LUMO values in the range of -3.9 eV as determined by cyclic voltammetry. Electroluminescent devices with copolymers in PVK blends show characteristic red emission from peryle ne which is nearly identical with its photoluminescence and the efficiency of this device, ITO/copolymer+PVK blend(100nm)/Al, depends upon the PVK con tent.