Strongly exchange-coupled triplet pairs in an organic semiconductor

Leah R. Weiss; Sam L. Bayliss; Felix Kraffert; Karl J. Thorley; John E. Anthony; Robert Bittl; Richard H. Friend; Akshay Rao; Neil C. Greenham; Jan Behrends

doi:10.1038/nphys3908

Strongly exchange-coupled triplet pairs in an organic semiconductor

Leah R. Weiss, Sam L. Bayliss, Felix Kraffert, Karl J. Thorley, John E. Anthony, Robert Bittl, Richard H. Friend, Akshay Rao, Neil C. Greenham, Jan Behrends

Research output: Contribution to journal › Article › peer-review

211 Scopus citations

Abstract

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 3 μs and a spin coherence time approaching 1 μs, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.

Original language	English
Pages (from-to)	176-181
Number of pages	6
Journal	Nature Physics
Volume	13
Issue number	2
DOIs	https://doi.org/10.1038/nphys3908
State	Published - Feb 1 2017

Bibliographical note

Publisher Copyright:
© 2017 Macmillan Publishers Limited.

Funding

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/G060738/1, EP/M006360/1, EP/M005143/1
Engineering and Physical Sciences Research Council

ASJC Scopus subject areas

General Physics and Astronomy

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1038/nphys3908

Cite this

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title = "Strongly exchange-coupled triplet pairs in an organic semiconductor",

abstract = "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 3 μs and a spin coherence time approaching 1 μs, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.",

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doi = "10.1038/nphys3908",

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T1 - Strongly exchange-coupled triplet pairs in an organic semiconductor

AU - Weiss, Leah R.

AU - Bayliss, Sam L.

AU - Kraffert, Felix

AU - Thorley, Karl J.

AU - Anthony, John E.

AU - Bittl, Robert

AU - Friend, Richard H.

AU - Rao, Akshay

AU - Greenham, Neil C.

AU - Behrends, Jan

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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 3 μs and a spin coherence time approaching 1 μs, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.

AB - 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 3 μs and a spin coherence time approaching 1 μs, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.

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JO - Nature Physics

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IS - 2

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Strongly exchange-coupled triplet pairs in an organic semiconductor

Abstract

Bibliographical note

Funding

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UN SDGs

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