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Caroline Murawski, Philipp Liehm, Karl Leo and Malte C. Gather Influence of Cavity Thickness and Emitter Orientation on the Efficiency Roll-Off of Phosphorescent Organic Light-Emitting Diodes Advanced Functional Materials 24

Version of Record online: 9 OCT 2013 | DOI: 10.1002/adfm.201302173

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The efficiency roll-off of organic light-emitting diodes is studied by varying the distance between emitter and metal cathode. Roll-off is found to depend on the orientation of the emitter molecules, which can be explained by measurements and modeling of the triplet decay rate. Simulations of the roll-off behavior give further insight into the principles of efficient stack design.

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