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Science 28 April 2000:
Vol. 288. no. 5466, pp. 652 - 656
DOI: 10.1126/science.288.5466.652
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Reports
Control of Energy Transfer in Oriented Conjugated Polymer-Mesoporous Silica Composites
Thuc-Quyen Nguyen,
Junjun Wu,
Vinh Doan,
Benjamin J. Schwartz,
*
Sarah H. Tolbert
*
Nanoscale architecture was used to control energy
transfer in semiconducting polymers embedded in the channels of
oriented, hexagonal nanoporous silica. Polarized femtosecond
spectroscopies show that excitations migrate unidirectionally from
aggregated, randomly oriented polymer segments outside the pores to
isolated, aligned polymer chains within the pores. Energy migration
along the conjugated polymer backbone occurred more slowly than
Förster energy transfer between polymer chains. The different
intrachain and interchain energy transfer time scales explain the
behavior of conjugated polymers in a range of solution environments.
The results provide insights for optimizing nanostructured materials for use in optoelectronic devices.
Department of Chemistry and Biochemistry, University of
California, Los Angeles, Los Angeles, CA 90095-1569,
USA.
*
To whom correspondence should be addressed. E-mail:
tolbert{at}chem.ucla.edu and schwartz{at}chem.ucla.edu
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