Strongly exchange-coupled triplet pairs in an organic semiconductor

被引：0

作者：

Weiss L.R. ^{[1
]}

Bayliss S.L. ^{[1
]}

Kraffert F. ^{[2
]}

Thorley K.J. ^{[3
]}

Anthony J.E. ^{[3
]}

Bittl R. ^{[2
]}

Friend R.H. ^{[1
]}

Rao A. ^{[1
]}

Greenham N.C. ^{[1
]}

Behrends J. ^{[2
]}

机构：

[1] Cavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge

[2] Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin, Berlin

[3] Department of Chemistry, University of Kentucky, Lexington, 40506-0055, KY

来源：

Nature Physics | 2017年 / 13卷 / 2期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1038/nphys3908

中图分类号：

学科分类号：

摘要：

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. © 2017 Macmillan Publishers Limited.

引用

页码：176 / 181

页数：5

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