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Proceedings Paper

Polymer optical sensor based on photochromic switching of charge carrier mobility
Author(s): Martin Weiter; Martin Vala; Oldrich Zmeskal; Jiri Navratil; Petr Toman; Stanislav Nespurek
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Paper Abstract

Polymer photoelectronic device based on interaction between &pgr;-conjugated polymer matrices and photochromic molecules was fabricated. The theoretical and experimental studies proved that the photochromic reaction in studied devices should eventuate in changes of optical and electrical properties of polymers such as luminescence and conductivity. The quantum chemical calculations showed that the presence of dipolar species in the vicinity of a polymer chain modifies the on-chain site energies and consequently increases the width of the distribution of hopping transport states. Optical switching was studied using standard absorption and photoluminescence spectroscopy. A strong photoluminescence quenching after the photochromic conversion caused by radiative energy transfer was observed. The influence of photoswitchable charge carrier traps on charge transport was evaluated by current-voltage measurement and by Impedance spectroscopy method. It was shown that deep traps may significantly affect energy of the transport level, and thus control the transport of charge carriers. Based on these findings, polymer optical sensor was proposed.

Paper Details

Date Published: 16 May 2007
PDF: 12 pages
Proc. SPIE 6585, Optical Sensing Technology and Applications, 658519 (16 May 2007); doi: 10.1117/12.722907
Show Author Affiliations
Martin Weiter, Brno Univ. of Technology (Czech Republic)
Martin Vala, Brno Univ. of Technology (Czech Republic)
Oldrich Zmeskal, Brno Univ. of Technology (Czech Republic)
Jiri Navratil, Brno Univ. of Technology (Czech Republic)
Petr Toman, Institute of Macromolecular Chemistry (Czech Republic)
Stanislav Nespurek, Brno Univ. of Technology (Czech Republic)
Institute of Macromolecular Chemistry (Czech Republic)

Published in SPIE Proceedings Vol. 6585:
Optical Sensing Technology and Applications
Francesco Baldini; Jiri Homola; Robert A. Lieberman; Miroslav Miler, Editor(s)

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