Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters.

@article{Zhang2015Nearly1I,
  title={Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters.},
  author={Qisheng Zhang and Daniel Ping-Kuen Tsang and Hirokazu Kuwabara and Yasuhiro Hatae and Bo Li and Takehiro Takahashi and Sae Youn Lee and Takuma Yasuda and Chihaya Adachi},
  journal={Advanced materials},
  year={2015},
  volume={27 12},
  pages={2096-100}
}
The design of efficient and concentration-insensitive metal-free thermally activateddelayed fluorescence (TADF) materials is reported. Blue and green organic light-emitting diodes (OLEDs) containing a hole-transport layer, an undoped TADF emissive layer, and an electron-transport layer achieve maximum external quantum efficiencies of 19%, which is comparable to the best doped OLEDs. 
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