Two novel pure hydrocarbon compounds, SF33 and SF34, are designed with high triplet energies and stabilities. The efficiency of an SF34/FIrpic-based device is as high as 22.0%. Moreover, SF33 and SF34 are also used as hosts for thermally activated delayed fluorescence organic light-emitting diodes and achieve external quantum efficiencies in excess of 20.8% and 22.3%, respectively. The pure hydrocarbon host shows a much longer device lifetime than the traditional host 4,4′-di(N-carbazolyl)biphenyl.
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Cui et al. (2015) studied this question.
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