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| - Transfer of Electronic Excitation Energy between Randomly Mixed Dye Molecules in theChannels of Zeolite L
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| - Host−guest materials containing strongly fluorescent donor and acceptor molecules have been prepared. Fine-tuning of the donor to acceptor distance in this material allows beautiful visible and quantitative observationof electronic excitation energy transfer phenomena. Oxonine and pyronine have been used as guest moleculesand zeolite L as host. The dyes have been inserted by ion exchange. Stationary state and time-resolvedexperiments have been carried out with zeolite crystals of 300 and 700 nm size in the dye concentrationrange of 10-4 mol/L up to 0.042 mol/L. The fluorescence decay of the donor and the pumping of the acceptorvia energy transfer, which can be well observed, became faster with increasing loading. The behavior of thesystem follows requirements expected for Förster energy transfer material.
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