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- Title
Blue Light Emitting Polyphenylene Dendrimers with Bipolar Charge Transport Moieties.
- Authors
Guang Zhang; Auer-Berger, Manuel; Gehrig, Dominik W.; Blom, Paul W. M.; Baumgarten, Martin; Schollmeyer, Dieter; List-Kratochvil, E. J. W.; Müllen, Klaus
- Abstract
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.
- Publication
Molecules, 2016, Vol 21, Issue 10, p1400
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules21101400