Publications by authors named "Tjeerd J Schaafsma"
Exciton diffusion has been studied in 5-25-nm-thick films of zinc tetra-(p-octylphenyl)-porphyrin (ZnTOPP) spin-coated onto quartz slides by intentional doping with quenchers using steady-state as well as time-resolved fluorescence spectroscopy. The fluorescence spectra of the films are very similar to those of solutions, indicating emission from localized exciton states. From the dependence of the fluorescence quenching on the quencher concentration and fluorescence lifetime measurements, the exciton diffusion can be concluded to be quasi-one-dimensional with an exciton diffusion length of 9 +/- 3 nm and an intrastack energy-transfer rate constant of 10(11)-10(12) s(-1).
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- The study investigates the photophysical properties of zinc tetra-(p-octylphenyl)-porphyrin films, revealing that they form linear aggregates with a unique stacked configuration.
- It identifies that the films have their molecular planes oriented perpendicularly to the substrate, with calculated interplanar distances and angles that are consistent with solutions.
- The research also examines how different solvents and temperature treatments affect the film ordering, noting that toluene leads to highly ordered films, while other solvents disrupt this order, with annealing restoring the original characteristics associated with toluene.