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Highly efficient deep‐blue‐phosphorescent organic light‐emitting diodes have been developed using bipolar‐type high‐triplet‐energy host materials with a carbazole core and two phosphine oxide (PPO21) or phosphine sulfide (PPS21) units. A high quantum efficiency of 19.2% with a deep‐blue color coordinate of (0.14,0.16) was achieved in the deep‐blue device with PPO21 as a host material (see figure)...
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