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
收藏
页码：176 / 181
页数：5
相关论文
共 50 条
12345