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

226 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

UN SDGs

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

SDG 7 Affordable and Clean Energy

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

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.",

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

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doi = "10.1038/nphys3908",

language = "English",

volume = "13",

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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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U2 - 10.1038/nphys3908

DO - 10.1038/nphys3908

M3 - Article

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SN - 1745-2473

VL - 13

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EP - 181

JO - Nature Physics

JF - Nature Physics

IS - 2

ER -

Strongly exchange-coupled triplet pairs in an organic semiconductor

Abstract

Bibliographical note

Funding

UN SDGs

ASJC Scopus subject areas

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