Title: Vibrational and electronic relaxation in MEH-PPV using few cycle pulses
Authors: Kobayashi, Takayoshi
Yamashita, Munenori
Du, Juan
Zhang, Jun
Iwakura, Izumi
Department of Electrophysics
Issue Date: 30-Jul-2013
Abstract: The electronic population decay time is determined to be about 500 fs in (poly-[2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylenevinylenel (MEH-PPV) using 5.7 fs pulses. The ultrafast electronic dephasing time and the self-trapping time of free exciton to form an exciton polaron is determined as 25 +/- 2 fs and 50 +/- 23 fs, respectively. Real-time spectrogram analysis reveals dynamic mode coupling among the high-frequency and low-frequency modes. The energy-ladder descent vibrational process is clarified using the first moment of the difference absorption spectrum. The phase relaxation time is calculated from the widths of the Fourier spectra of several strongly coupled modes. (C) 2013 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.cplett.2013.06.029
ISSN: 0009-2614
DOI: 10.1016/j.cplett.2013.06.029
Volume: 579
Begin Page: 51
End Page: 57
Appears in Collections:Articles