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Thermally activated delayed fluorescence (TADF) diodes with deep-blue emission and a state-of-the-art external quantum efficiency are realized by using a novel phosphine oxide host with a high triplet energy of 2.98 eV and a “Si-locked” planar rigid structure. These results manifest the effectiveness of our “insulating lock” strategy in suppressing structural-relaxation induced nonradiative energy losses.
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Li et al. (2015) studied this question.
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