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High efficiency performance and color rendering index (CRI) are two main requirements for the applications of white organic light‐emitting diodes (WOLEDs). We report successful fabrication of efficient and high‐color‐rendering phosphorescent WOLED by employing ultra‐thin red emitter – spacer layer – ultra‐thin green emitter architecture. By fine‐tuning the thicknesses of emitting layers and spacer...
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