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Paper published in Nature Physics

last modified Oct 28, 2016 10:02 PM
Leah's paper on the formation of strongly exchange-coupled quintet states in organic semiconductors is published in Nature Physics



From biological complexes to devices based on organic semiconductors, spin interactions play a key role in the function of molecular systems. For instance, triplet-pair reactions impact operation of organic light-emitting diodes as well as photovoltaic devices. Conventional models for triplet pairs assume they interact only weakly. Here, using electron spin resonance, we observe long-lived, strongly interacting triplet pairs in an organic semiconductor, generated via singlet fission. Using coherent spin manipulation of these two-triplet states, we identify exchange-coupled (spin-2) quintet complexes coexisting with weakly coupled (spin-1) triplets. We measure strongly coupled pairs with a lifetime approaching 3μs and a spin coherence time approaching 1μs, at 10K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.

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