Spatially and Temporally Resolved Emission from Aggregates in Conjugated Polymers
OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
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We present results of ew, time-resolved and spatially resolved spectroscopic studies of emission and absorption in a model conjugated polymer, poly p-pyridyl vinylene PPyV. The redshifted film spectra suggest the formation of aggregated regions. The approx. 4x reduction in emission efficiency in films vs. solution is attributed to a longer radiative lifetime for aggregate excitons, as is evidenced by time-resolved fluorescence measurements. We present the first direct optical imaging of aggregates in a conjugated polymer via near-field scanning optical microscopy NSOM. The aggregate emission and absorption are found to be localized to partially aligned regions of the film approx. 200 nm in size.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy