Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures

V.G. Pavelyev, O.D. Parashchuk, T.V. Orekhova, I.F. Perepichka, D.Yu. Paraschuk, P.H.M. van Loosdrecht, M.S. Pshenichnikov

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Abstract

We study charge recombination rates in blends of MEH-PPV and a comprehensive set of low molecular-weight fluorine-based acceptors, using visible-pump – IR-probe photoinduced absorption technique. The positions of acceptor’s HOMO-LUMO levels are engineered by addition of different chemical substituents. The results clearly show the exponential scaling of the charge recombination rate with the acceptor LUMO energy. The minimal donor-acceptor LUMO energy difference required to form a CTC state is estimated as ~0.25 eV.
Original languageEnglish
Title of host publicationProceedings of the XVIIIth International Conference on Ultrafast Phenomena
EditorsMajed Chergui, Steve Cundiff, Antoinette Taylor, Regina de Vivie-Riedle, Kaoru Yamanouchi
PublisherUniversity of Groningen, The Zernike Institute for Advanced Materials
Pages05036-p.1-05036-p.3
Volume41
Edition41
ISBN (Print)9782759809561
Publication statusPublished - 2013
EventXVIIIth International Conference on Ultrafast Phenomena, Lausanne, Switzerland -
Duration: 8-Jul-201213-Jul-2012

Conference

ConferenceXVIIIth International Conference on Ultrafast Phenomena, Lausanne, Switzerland
Period08/07/201213/07/2012

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