Spin Rabi flopping in the photocurrent of a polymer light-emitting diode

Nature Materials
D R McCameyC Boehme

Abstract

Electron spin is fundamental in electrical and optical properties of organic electronic devices. Despite recent interest in spin mixing and spin transport in organic semiconductors, the actual spin coherence times in these materials have remained elusive. Measurements of spin coherence provide impartial insight into spin relaxation mechanisms, which is significant in view of recent models of spin-dependent transport and recombination involving high levels of spin mixing. We demonstrate coherent manipulation of spins in an organic light-emitting diode (OLED), using nanosecond pulsed electrically detected electron spin resonance to drive singlet-triplet spin Rabi oscillations. By measuring the change in photovoltaic response due to spin-dependent recombination, we demonstrate spin control of electronic transport and thus directly observe spin coherence over 0.5 s. This surprisingly slow spin dephasing underlines that spin mixing is not responsible for magnetoresistance in OLEDs. The long coherence times and the spin manipulation demonstrated are crucially important for expanding the impact of organic spintronics.

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Citations

May 9, 2012·The Review of Scientific Instruments·Felix HoehneMartin S Brandt
Jun 17, 2015·Journal of Magnetic Resonance·T L Keevers, D R McCamey
Jan 17, 2013·The Journal of Physical Chemistry Letters·Yao-Jane HsuChien-Te Chen
Jan 29, 2011·Journal of the American Chemical Society·Sang-Yun LeeChristoph Boehme
Mar 25, 2016·Physical Chemistry Chemical Physics : PCCP·Haiping PanBin Hu
Aug 25, 2009·Nature Materials·V Alek DediuCarlo Taliani
Feb 16, 2010·Nature Materials·Tho D NguyenZ Valy Vardeny
Nov 13, 2014·Advanced Materials·Wei QinShenqiang Ren
Jul 6, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·John M LuptonChristoph Boehme
Mar 15, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Z G Yu
Sep 14, 2010·Angewandte Chemie·Debangshu ChaudhuriJohn M Lupton
Jun 14, 2012·Nature Communications·W J BakerC Boehme
Apr 7, 2010·Physical Review Letters·D R McCameyC Boehme
Jan 15, 2011·Physical Review Letters·T D NguyenZ V Vardeny
Jul 19, 2013·Physical Review Letters·C A Mujica-MartinezM Thorwart
Dec 6, 2019·Nature Communications·Matthias NiethammerJörg Wrachtrup
Jul 8, 2017·Beilstein Journal of Nanotechnology·Taras ChutoraHéctor Vázquez
Sep 3, 2020·Advanced Materials·Mengmeng WeiWei Qin
Apr 8, 2011·Advanced Materials·Marco GobbiLuis E Hueso
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Sep 26, 2019·Faraday Discussions·Tobias GrünbaumJohn M Lupton
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