Electroactive polymers containing 3-arylcarbazolyl units as hole transporting materials for OLEDs

• Polymers with arylcarbazolyl chromophores have been synthesized.
• Electro-active layers of the materials were tested in OLEDs.
• An electroluminescent OLED with Alq3 emitter demonstrated efficiency of 3.3 cd/A.

Monomers and their polymers containing 3-arylcarbazolyl electrophores have been synthesized by the multi-step synthetic route. The materials were characterized by thermo-gravimetric analysis, differential scanning calorimetry and electron photoemission technique. The polymers represent materials of high thermal stability having initial thermal degradation temperatures in the range of 331–411 °C. The glass transition temperatures of the amorphous polymeric materials were in the rage of 148–175 °C. The electron photoemission spectra of thin layers of monomers showed ionization potentials in the range of 5.6–5.65 eV. Hole-transporting properties of the polymers were tested in the structures of organic light emitting diodes with Alq3 as the green emitter. The device containing hole-transporting layers of polyether with 3-naphthylcarbazolyl groups exhibited the best overall performance with a maximum current efficiency of 3.3 cd/A and maximum brightness of about 1000 cd/m2.

Figure optionsDownload high-quality image (119 K)Download as PowerPoint slide