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Jie Li, Tetsuya Nakagawa, James MacDonald, Qisheng Zhang, Hiroko Nomura, Hiroshi Miyazaki and Chihaya Adachi Highly Efficient Organic Light-Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative Advanced Materials 25

Version of Record online: 13 MAY 2013 | DOI: 10.1002/adma.201300575

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An orange-red organic light-emitting diode containing a heptazine derivative exhibits high performance with a maximum external quantum efficiency of 17.5 ± 1.3% and a peak luminance of 17000 ± 1600 cd m−2 without any light out-coupling enhancement. The high electroluminescence performance can be ascribed to the presence of an efficient up-conversion channel from the lowest triplet state to the lowest singlet state.

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