Charge‐Transporting Polymers based on Phenylbenzoimidazole Moieties |
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| Authors: | Marc Debeaux Manuel W Thesen Daniel Schneidenbach Henning Hopf Silvia Janietz Hartmut Krüger Armin Wedel Wolfgang Kowalsky Hans‐Hermann Johannes |
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| Affiliation: | 1. Labor für Elektrooptik am Institut für Hochfrequenztechnik, Technische Universit?t Braunschweig, Bienroder Weg 94, 38106 Braunschweig (Germany);2. Fraunhofer‐Institut für Angewandte Polymerforschung, Wissenschaftspark Golm, Geiselbergstr. 69, 14476 Potsdam (Germany);3. Institut für Organische Chemie, Technische Universit?t Brauschweig, Hagenring 30, 38106 Braunschweig (Germany) |
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| Abstract: | A series of novel styrene functionalized monomers with phenylbenzod]imidazole units and the corresponding homopolymers are prepared. These side‐chain polymers show high glass‐transition temperatures that even exceed the corresponding value for the common electron‐transporting material 1,3,5‐tris(1‐phenyl‐1H‐benzod]imidazol‐2‐yl)benzene (TPBI). Similar electronic behavior between the polymers and TPBI is shown. The polymers are used as matrices for phosphorescent dopants. The fabricated devices exhibit current efficiencies up to 38.5 cd A?1 at 100 cd m?2 and maximum luminances of 7400 cd m?2 at 10 V with a minimum turn‐on voltage as low as 2.70 V in single‐layer devices with an ITO/PEDOT:PSS anode (ITO = indium tin oxide, PEDOT:PSS = poly(3,4‐ethylenedioxythiophene) doped with poly(styrenesulfonate)) and a CsF/Ca/Ag cathode. |
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| Keywords: | Charge Transport Electro‐Optical Materials Organic Light‐Emitting Diodes Polymeric Materials |
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