Polyethers containing 3,6-diarylcarbazolyl groups as polymeric materials for hole transporting layers of OLEDs

Several polyethers containing pendent 3,6-diarylcarbazolyl moieties have been synthesized by the multi-step synthetic routes. Full characterization of their structures is presented. The polymers represent materials of high thermal stability with initial thermal degradation temperatures exceeding 419 degrees C. The glass transition temperatures of the amorphous materials were in the range of 66-108 degrees C. The electron photoemission spectra of thin layers of the polymers showed ionization potentials in the range of 5.47-5.69eV. Hole transporting properties of the polymeric materials were tested in the structures of organic light emitting diodes with Alq(3) as the green emitter. The device containing hole transporting layers of the polymer with 3,6-di(4-biphenyl)carbazolyl moieties exhibited the best overall performance with a maximum photometric efficiency of about 2.3cd/A and maximum brightness exceeding 2630cd/m(2).