Series
COPE-STAMI Distinguished Lecture Series

Permanent Link
https://hdl.handle.net/1853/70868
Series Type
Event Series
Description
Associated Organization(s)
Associated Organization(s)

Filters
2016 1
1
1
1
1
Reset filters

Settings
search.filters.applied.f.isSeriesOfPublicationTitle: COPE-STAMI Distinguished Lecture Series × Author: Köhler, Anna ×

Publication Search Results

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Disorder-Order Transitions in p-Conjugated Polymers
    (Georgia Institute of Technology, 2016-12-02) Köhler, Anna
    The aggregation of p-conjugated materials significantly impacts on the photophysics, and thus on the performance of optoelectronic devices. Nevertheless, we know comparatively little about the laws governing aggregate formation of p-conjugated materials from solution. In this talk, I shall compare, discuss and summarize how aggregates form for three different types of compounds, that is, homopolymers, donor-acceptor type polymers and low molecular weight compounds. To understand how aggregates form, we employ temperature dependent optical spectroscopy, which is a simple yet powerful tool for such investigations. I shall discuss how optical spectra can be analysed to identify distinct conformational states and to obtain quantitative information on changes in the inter-chain coupling, the conjugation length and the oscillator strength upon aggregate formation. We find aggregate formation to proceed alike in all these compounds by a coil-to-globule like first order phase transition. Notably, the chain expands before it collapses into a highly ordered dense state. I will address the role of side chains and the impact of changes in environmental polarization.