The development of high performance organic light emitting diodes (OLEDs) for display and lighting
applications has attracted considerable research interest from both academia and industry. In this work, the
designs of simplified phosphorescent OLEDs with exceptionally high efficiency are discussed. It is found
that discrete blocking layers and a double emission zone are unnecessary to achieve high efficiency in
optimized phosphorescent OLEDs. Due to the elimination of these redundant layers, the device structure can
be highly simplified. It is also shown that single-layer, two organic component devices are feasible with
state-of-the-art efficiency.
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