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Photoinduced intermolecular Charge-Transfer Systems for Optical Limiting

Published online by Cambridge University Press:  03 September 2012

X.-L. Wu ,
A. A. Heikal ,
I.-Y. S. Lee ,
M. Bohorquez  and
J. W. Perry
X.-L. Wu
Affiliation:
Beckman Institute, California Institute of Technology, Pasadena, CA 91125
A. A. Heikal
Affiliation:
Beckman Institute, California Institute of Technology, Pasadena, CA 91125
I.-Y. S. Lee
Affiliation:
Beckman Institute, California Institute of Technology, Pasadena, CA 91125
M. Bohorquez
Affiliation:
Department of Chemistry, Drake University, Des Moines, Iowa 50311-4505
J. W. Perry
Affiliation:
Beckman Institute, California Institute of Technology, Pasadena, CA 91125 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
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Abstract

Photoinduced intermolecular charge transfer (PICT) in donor/acceptor systems has been investigated as an approach to the design of new optical limiting (OL) materials. Solution of cyanines or porphyrins (as sensitizers) and viologen derivatives (as electron acceptors) were used in these studies. Picosecond time-resolved fluorescence measurements were carried out to estimate the charge-transfer rate in these donor/acceptor systems. The radical-ion absorption bands were identified using spectroelectrochemistry. Nonlinear transmission measurements with picosecond and nanosecond laser pulses were utilized to determine the effective photo-induced to ground-state absorption cross-section ratio of the sensitizers alone and the sensitizer/acceptor systems. Our studies are consistent with optical limiting by PICT in solution and indicate a substantial radical-ion yield in the systems examined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 479: Symposium S – Materials for Optical Limiting II , 1997 , 103
Copyright
Copyright © Materials Research Society 1997

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