Abstract
In hybrid systems which are self-assembled in solution from surface treated CdSe/ZnSquantum dots (QDs) and isolated phycobiliprotein (PBP) complexes from thecyanobacterium Acaryochloris marina, excitation energy transfer (EET) from the QDs tothe PBP complexes was observed. The EET from the QDs to attached PBPs wasanalyzed with time integrated fluorescence spectroscopy and time-correlated singlephoton counting (TCSPC) at different temperatures. This functional connectionbetween QDs and PBPs via EET is interrupted at temperatures below 273 K (0 °C) (Schmitt et al 2010 Photon. Nanostruct. submitted). The evaluation of thetemperature-dependent fluorescence spectra of the QDs showed that the change ofthe excitation energy transfer efficiency at temperatures below 273 K cannot beexplained by the change of the spectral overlap integral alone. Therefore the value ofκ2/R126 must change at 273 K. We assume that micro crystals of water, formed in between the QDsand the PBP antenna structures, lead to a structural change of the hybrid complex. Ourresults show that TCSPC is suitable to distinguish strongly coupled and weakly coupledQD-PBP complexes at different temperatures.
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