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High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter

Article excerpt is from:Dae-Hyeon Kim, Anthony D’Aléo, Xian-Kai Chen, Atula D. S. Sandanayaka, Dandan Yao, Li Zhao, Takeshi Komino, Elena Zaborova, Gabriel Canard, Youichi Tsuchiya,Eunyoung Choi, Jeong Weon Wu, Frédéric Fages, Jean-Luc Brédas, Jean-Charles Ribierre and Chihaya Adachi
Nature Photonics, 12, Feb 2018, 98–104

Here, we report thermally activated delayed fluorescent organic light-emitting diodes that operate at near-infrared wavelengths with a maximum external quantum efficiency of nearly 10% using a boron difluoride curcuminoid derivative. As well as an effective upconversion from triplet to singlet excited states due to the non-adiabatic coupling effect, this donor–acceptor–donor compound also exhibits efficient amplified spontaneous emission. By controlling the polarity of the active medium, the maximum emission wavelength of the electroluminescence spectrum can be tuned from 700 to 780 nm. This study represents an important advance in nearinfrared organic light-emitting diodes and the design of alternative molecular architectures for photonic applications based on thermally activated delayed fluorescence.