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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...
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