Site-selective measurement of coupled spin pairs in an organic semiconductor

• DOI: 10.1073/pnas.1718868115
• Publication Date: 2018-05-02T19:06:11Z
• Authors: S. L. Bayliss; L. R. Weiss; A. Mitioglu; K. Galkowski; Z. Yang; K. Yunusova; A. Surrente; K. J. Thorley; J. Behrends; R. Bittl; J. E. Anthony; A. Rao; R. H. Friend; P. Plochocka; P. C. M. Christianen; N. C. Greenham; A. D. Chepelianskii
• Keywords: Organic semiconductor

Significance Pairs of spins in molecular materials have attracted significant interest as intermediates photovoltaic devices and light-emitting diodes. However, isolating the local spin electronic environments such has proved challenging due to complex structures which they reside. Here we show how exchange coupling can be used select characterize multiple coexisting pairs, enabling joint measurement their interactions optical profiles. We apply this spin-1 pairs formed by photon absorption whose gives rise total-spin <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>S</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0,1</mml:mn> </mml:math> 2-pair configurations with drastically different properties. This presents a way identifying conformations involved spin-pair processes generating design rules for more effective use interacting spins.