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Electroactive polymers containing 3-arylcarbazolyl units as hole transporting materials for OLEDs
Affiliation:1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu plentas 19, LT50254 Kaunas, Lithuania;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Bucharest R-077125, Romania;2. Doctoral School of Physics, Faculty of Physics, University of Bucharest, Bucharest, Romania;1. National Research Tomsk Polytechnic University, Lenin Avenue 30, 634050 Tomsk, Russia;2. Tomsk State University of Architecture and Building, Soljanoj Street, 2 Tomsk, Russia;3. L.N. Gumilyov Eurasian National University, Astana, Kazakhstan;1. IF-UNAM, México D.F. 04510, Mexico;2. CINVESTAV-IPN, México D.F. 07360, Mexico;3. CICATA-IPN, México D.F. 11500, Mexico;4. UAEH-ESAp, Apan, Hidalgo 43920, Mexico;1. P.G. & Research Department of Physics, Lady Doak College, Madurai 625002, Tamil Nadu, India;2. Department of Physics, Mother Teresa Women’s University, Kodaikanal 624102, Tamil Nadu, India;3. Light and Matter Physics Group, Raman Research Institute, Bangalore, Karnataka, India;1. Charles University in Prague, Faculty of Science, Department of Inorganic Chemistry, Hlavova 8, 128 40 Prague 2, Czech Republic;2. Charles University in Prague, Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
Abstract: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.
Keywords:Polyether  Substituted carbazole  Amorphous material  Hole transporting material  Ionization potential  Organic light emitting diode
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