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Title: Relaxation dynamics and exciton energy transfer in the low-temperature phase of MEH-PPV

Understanding the effects of aggregation on exciton relaxation and energy transfer is relevant to control photoinduced function in organic electronics and photovoltaics. Here, we explore the photoinduced dynamics in the low-temperature aggregated phase of a conjugated polymer by transient absorption and coherent electronic two-dimensional (2D) spectroscopy. Coherent 2D spectroscopy allows observing couplings among photoexcited states and discriminating band shifts from homogeneous broadening, additionally accessing the ultrafast dynamics at various excitation energies simultaneously with high spectral resolution. By combining the results of the two techniques, we differentiate between an initial exciton relaxation, which is not characterized by significant exciton mobility, and energy transport between different chromophores in the aggregate.
Authors:
;  [1] ; ; ;  [2] ;  [1] ;  [3]
  1. Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg (Germany)
  2. Lehrstuhl Experimentalphysik II, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth (Germany)
  3. (CNC), Universität Würzburg, Am Hubland, 97074 Würzburg (Germany)
Publication Date:
OSTI Identifier:
22415902
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; AGGLOMERATION; CONTROL; ENERGY TRANSFER; EXCITATION; EXCITED STATES; EXCITONS; MOBILITY; PHOTOVOLTAIC EFFECT; POLYMERS; POWER TRANSMISSION; RELAXATION; TEMPERATURE DEPENDENCE; TRANSIENTS; TWO-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS