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Using a single tetradentate platinum emitter dubbed Pt7O7, efficient and stable white organic light‐emitting diodes are developed. The excimer‐based white devices achieve an external quantum efficiency (EQE) of 24.5%, coordinates of (0.37, 0.42) based on the Commission internationale de l'éclairage (CIE) system, and a color rendering index (CRI) of 70. Moreover, devices of Pt7O7 in a stable structure...
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