Effective stimulated emission and excited-state absorption cross-section spectra of luminescent polymers

A. Penzkofer, W. Holzer, S. H. Gong, D. D.C. Bradley, X. Long, A. Bleyer, W. J. Blau, A. P. Davey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The effective stimulated emission cross-section spectra of a para-phenylene-vinylene polymer and of two para-phenylene-ethynylene polymers are determined by a fluorescence amplification technique. For these luminescent polymers laser action has been achieved in solution. The effective stimulated emission cross-section spectra are found to be small compared to the stimulated emission cross-section spectra calculated from fluorescence quantum distribution and fluorescence lifetime measurements. The laser excitation of the polymer solutions seems to form lattice relaxed exciton conformations extending over a few monomer units which are thought to be responsible for upper-to-lower-state stimulated emission and lower-to-upper-state (excited-state) absorption.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIEBellingham, WA, United States
StatePublished - Dec 1 1998
Externally publishedYes

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