List references from the University of Geneva Physical Chemistry reference database

A rational molecular design strategy for carbazoleâ€“oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66Â eV and o-3MPCzPOXD: 2.73Â eV versus the initial host material o-PczPOXD: 2.62Â eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)₃; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structureâ€“property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.

Controlling singlet–triplet splitting in carbazole–oxadiazole based bipolar phosphorescent host materials P. Kautny, Z. Wu, B. Stöger, A. Tissot, E. Horkel, J. Chen, D. Ma, H. Hagemann, J. Fröhlich and D. Lumpi Organic electronics, 17 (2015), p216-228 DOI:10.1016/j.orgel.2014.11.027 \| unige:44949 \| Article HTML \| Article PDF \| Supporting Info
A rational molecular design strategy for carbazoleâ€“oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66Â eV and o-3MPCzPOXD: 2.73Â eV versus the initial host material o-PczPOXD: 2.62Â eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)₃; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structureâ€“property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.

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