Host materials for blue phosphorescent OLEDs

Daniel Wagner; Michael Rothmann; Peter Strohriegl; Christian Lennartz; Ingo Münster; Gerhard Wagenblast; Christian Schildknecht

doi:10.1117/12.928913

13 September 2012 Host materials for blue phosphorescent OLEDs

Daniel Wagner, Michael Rothmann, Peter Strohriegl, Christian Lennartz, Ingo Münster, Gerhard Wagenblast, Christian Schildknecht

Author Affiliations +

Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84761O (2012) https://doi.org/10.1117/12.928913
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

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.

Citation Download Citation

Daniel Wagner, Michael Rothmann, Peter Strohriegl, Christian Lennartz, Ingo Münster, Gerhard Wagenblast, and Christian Schildknecht "Host materials for blue phosphorescent OLEDs", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761O (13 September 2012); https://doi.org/10.1117/12.928913

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