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Proceedings Paper

Host materials for blue phosphorescent OLEDs
Author(s): Daniel Wagner; Michael Rothmann; Peter Strohriegl; Christian Lennartz; Ingo Münster; Gerhard Wagenblast; Christian Schildknecht
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Paper Abstract

PCTrz, a new bipolar host material containing a phenoxy-carbazole separated from a biscarbazolyl-triazine by a non-conjugated ether bond is presented. Computational calculations demonstrated the separation of PCTrz into an oxidation and a reduction site. A phosphorescent OLED with PCTrz as host and FIrpic as blue emitter yielded high current efficiencies of up to 16.2 cd/A. Additionally two electron transporting host materials DBFTaz and DBFTazC, both containing 1,2,4-triazole moieies, were synthesized and characterized. The triazole moiety in DBFTaz was formed by a classical ring closure reaction between a N-benzoylbenzimidate and a hydrazine. For DBFTazC we used another synthetical pathway which involves subsequent coupling of a carbazole and a triazole moiety to a dibenzofuran core. Both triazoles posses high triplet energies of 2.95 eV for DBFTaz and 2.97 eV for DBFTazC, which make the compounds interesting as matrix materials for blue phosphorescent OLEDs.

Paper Details

Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761O (13 September 2012); doi: 10.1117/12.928913
Show Author Affiliations
Daniel Wagner, Univ. of Bayreuth (Germany)
Michael Rothmann, Univ. of Bayreuth (Germany)
Peter Strohriegl, Univ. of Bayreuth (Germany)
Christian Lennartz, BASF SE (Germany)
Ingo Münster, BASF SE (Germany)
Gerhard Wagenblast, BASF SE (Germany)
Christian Schildknecht, BASF SE (Germany)

Published in SPIE Proceedings Vol. 8476:
Organic Light Emitting Materials and Devices XVI
Franky So; Chihaya Adachi, Editor(s)

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