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Proceedings Paper

Superquenching of fluorescent polyelectrolytes and its applications for chemical and biological sensing
Author(s): Troy Bergstedt; Robert Jones; Roger Helgeson; Duncan W. McBranch; David G. Whitten
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Paper Abstract

We report on the phenomenon of 'superquenching' observed for fluorescent polyelectrolytes -- conjugated and J-aggregate polymers -- in aqueous solution and in supported interfacial formats. Thus we find that for a number of substrates quenching by oppositely charged ions can occur with 'Stern- Volmer' quenching constants that are a million fold or greater than those for the quenching of similar 'molecular' chromophores by the same quenchers. The quenching can be tuned by a variety of techniques. The superquenching results from a combination of nonspecific but moderately strong association (due to a combination of Coulombic and hydrophobic interactions) between the quencher and polyelectrolyte with efficient excitonic or energy migration in the excited polymer. The effects reported here can be used in chemical and biological sensing applications.

Paper Details

Date Published: 15 June 2001
PDF: 7 pages
Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); doi: 10.1117/12.429371
Show Author Affiliations
Troy Bergstedt, QTL Biosystems, LLC (United States)
Robert Jones, QTL Biosystems, LLC (United States)
Roger Helgeson, QTL Biosystems, LLC (United States)
Duncan W. McBranch, QTL Biosystems, LLC (United States)
David G. Whitten, QTL Biosystems, LLC (United States)

Published in SPIE Proceedings Vol. 4279:
Organic Photonic Materials and Devices III
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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