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Molecules 2016, 21(10), 1400;

Blue Light Emitting Polyphenylene Dendrimers with Bipolar Charge Transport Moieties

Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany
Joanneum Research Materials, Institut für Oberflächentechnologien und Photonik, Franz-Pichler-Straße 30, Weiz 8160, Austria
Institute für Organische Chemie, Johannes Gutenberg-Universität, Mainz D-55128, Germany
Institut für Physik, Institut für Chemie, Humboldt-Universität zu Berlin, IRIS Adlershof, Unter den Linden 6, Berlin 10099, Germany
Authors to whom correspondence should be addressed.
Academic Editor: Jwo-Huei Jou
Received: 13 September 2016 / Revised: 14 October 2016 / Accepted: 16 October 2016 / Published: 20 October 2016
(This article belongs to the Special Issue Organic Light Emitting Diodes)
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Two light-emitting polyphenylene dendrimers with both hole and electron transporting moieties were synthesized and characterized. Both molecules exhibited pure blue emission solely from the pyrene core and efficient surface-to-core energy transfers when characterized in a nonpolar environment. In particular, the carbazole- and oxadiazole-functionalized dendrimer (D1) manifested a pure blue emission from the pyrene core without showing intramolecular charge transfer (ICT) in environments with increasing polarity. On the other hand, the triphenylamine- and oxadiazole-functionalized one (D2) displayed notable ICT with dual emission from both the core and an ICT state in highly polar solvents. D1, in a three-layer organic light emitting diode (OLED) by solution processing gave a pure blue emission with Commission Internationale de l’Éclairage 1931 CIE xy = (0.16, 0.12), a peak current efficiency of 0.21 cd/A and a peak luminance of 2700 cd/m2. This represents the first reported pure blue dendrimer emitter with bipolar charge transport and surface-to-core energy transfer in OLEDs. View Full-Text
Keywords: blue light emitter; bipolar charge transport; polyphenylene dendrimer; surface to core energy transfer blue light emitter; bipolar charge transport; polyphenylene dendrimer; surface to core energy transfer

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, G.; Auer-Berger, M.; Gehrig, D.W.; Blom, P.W.M.; Baumgarten, M.; Schollmeyer, D.; List-Kratochvil, E.J.W.; Müllen, K. Blue Light Emitting Polyphenylene Dendrimers with Bipolar Charge Transport Moieties. Molecules 2016, 21, 1400.

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