Abstract
The cover picture shows two different guest chromophores in a dendritic host. In this system the thiacarbocyanine dye A can act as an energy donor for the thiadicarbocyanine dye B. This system has been studied at the ensemble as well as at the single-molecule level. Because of the many free parameters in the system the results at the ensemble level are too complex to analyze in detail. At the single-molecule level a wide variety of energy transfer efficiencies was observed. Moreover, single entities showed fluctuations of the energy transfer efficiency as a function of time. In the background of the cover picture a smoothed surface of a 3D histogram of donor decay time versus fluorescence intensity is plotted for a single entity. Clearly two domains of energy transfer efficiency are observed. The single-molecule results permit a more in-depth understanding of the photophysics of this complex system. Find out more in the article by Hofkens and De Schryver et al. on pages 1005–1013.
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