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Single photon triggered dianion formation in TCNQ and F4TCNQ crystals

xcited state dynamics in two strong organic electron acceptor systems, TCNQ and F4TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F4TCNQ τ = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F4TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV)

Nature Publishing Group

Autor: Ma, Lin
Hu, Peng
Jiang, Hui
Kloc, Christian
Sun, Handong
Soci, Cesare
Voityuk, Alexander A.
Michel-Beyerle, Maria Elisabeth
Gurzadyan, Gagik G.
Resum: xcited state dynamics in two strong organic electron acceptor systems, TCNQ and F4TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F4TCNQ τ = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F4TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV)
Accés al document: http://hdl.handle.net/2072/285703
Llenguatge: eng
Editor: Nature Publishing Group
Drets: Attribution 4.0 Spain
URI Drets: http://creativecommons.org/licenses/by/4.0/es/
Matèria: Òptica física
Physical optics
Fotònica
Photonics
Títol: Single photon triggered dianion formation in TCNQ and F4TCNQ crystals
Tipus: info:eu-repo/semantics/article
Repositori: Recercat

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