Electroluminescence |
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Authors: | Hans J. van Gorkom |
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Affiliation: | (1) Department of Biophysics, Huygens Laboratory, Leiden University, P.O.Box 9504, NL-2300 RA Leiden, The Netherlands |
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Abstract: | An overview is presented of research based on the observation by Arnold and Azzi (1971) (Photochem Photobiol 14: 233–240), that an electric field induces charge-recombination luminescence in a suspension of photosynthetic membrane vesicles. The electroluminescence signals from Photosystems I and II are discussed in relation to the shape of the vesicles and the membrane potentials generated by the externally applied electric field. The use of the electroluminescence amplitude as a probe to study the kinetics and energetics of charge separation, and of its kinetics to monitor the electric-field induced charge recombination process are reviewed. Currently unresolved issues regarding the emission yield of electroluminescence are briefly discussed and the properties are summarized of the unexplained Photosystem II luminescence which is not sensitive to the membrane potential.Abbreviations DCMU 3(3 ,4 -dichlorophenyl)-1,1-dimethylurea - EL electroluminescence - PS I, II Photosystem I, II - TPB tetraphenylboron, an artificial electron donor for PS II - P primary electron donor - Si Yz P680 Pheo QA QB sequence of electron transfer components in PS II - plastocyanin P700 A0 A1 Fx FA (or FB) sequence of electron transfer components in PS I |
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Keywords: | electric field effect luminescence membrane potential |
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