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A rational molecular design strategy for carbazole–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: 2.66eV and o-3MPCzPOXD: 2.73eV versus the initial host material o-PczPOXD: 2.62eV) while less...
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