Publication date: 27th June 2014
CdSe and CdSe/CdSe/ZnS core shell quantum dots were prepared and coupled to a rylene-diimide dye (DYE) furnished with a di-carboxylate anchor [1]. The resulting complexes with different DYE-to-QD ratios were investigated using steady-state and time-resolved absorption and fluorescence spectroscopy.
In the case of CdSe/CdS/ZnS-QDs, energy transfer from QD to DYE occurred when QDs were excited. From femtosecond transient absorption (TA) spectroscopy, the energy transfer rate could be determined and used to calculate the absolute and relative DYE-to-QD ratios in various samples [2].
Remarkably, in contrast to the DYE-CdSe/CdS/ZnS system, in the DYE-CdSe system the TA measurements indicated that after energy transfer from excited CdSe to DYE electron transfer occurred from the CdSe ground state to the excited state of DYE. This finding was corroborated by measuring the fluorescence decay time of the selectively excited DYE in the complexes by time-correlated single photon counting. The experiments showed that an additional component appeared in the fluorescence decay whose time constant decreased with increasing DYE amount.
References:
[1] Ren, Ting; Mandal, Prasun K.; Erker, Wolfgang; Liu, Zhihong; Avlasevich, Yuri; Puhl, Larissa; Müllen, Klaus; Basché, Thomas, J. Am. Chem. Soc. 2008, 130, 17242–17243
[2] Dworak, Lars; Matylitsky, Victor V.; Ren, Ting; Basché, Thomas; Wachtveitl, Josef, J. Phys. Chem. C, 2014, 118, 4396–4402
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