Accession Number : ADA330160

Title :   Spatially and Temporally Resolved Emission from Aggregates in Conjugated Polymers

Descriptive Note : Technical rept.

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

Personal Author(s) : Blatchford, J. W. ; Gustafson, T. L. ; Epstein, A. J. ; Vanden Bout, D. A. ; Kerimo, J.

PDF Url : ADA330160

Report Date : 20 SEP 1997

Pagination or Media Count : 16

Abstract : 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.

Descriptors :   *EMISSION, *FLUORESCENCE, *SPECTROSCOPY, *POLYMERS, MEASUREMENT, RADIATION, MODELS, FILMS, OPTICAL IMAGES, MICROSCOPY, SPECTRA, AGGREGATES(MATERIALS), OPTICAL ANALYSIS, ABSORPTION, OPTICAL SCANNING, NEAR FIELD, EXCITONS.

Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE