Ultrafast Colour Changes in Organic Thin Films Based on Photoinduced Electron Transfer Reactions
- 1 June 1994
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 247 (1) , 39-48
- https://doi.org/10.1080/10587259408039189
Abstract
Colour changes due to photoinduced electron transfer reaction were studied by picosecond pulsed laser in thin polymer films containing 4,4′-bipyridinium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate salts as part of the main chain at 98–300 °K. The transient absorption at about 600 nm appeared in less than 20 ps upon excitation of ion-pair charge-transfer absorption, which was controlled by the laser pulse width. The decay curve was analyzed by a fast component with a fraction of about 0.2–0.3 and lifetime of a few hundreds ps together with an extremely slow one corresponding to steady and reversible colour changes. The lifetime of the former slightly increased with decreasing temperatures. A reaction mechanism is proposed based on these results.Keywords
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