Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 74: Quantum dots: Optical properties

HL 74.10: Vortrag

Donnerstag, 14. März 2013, 12:00–12:15, H16

Comparison of the energy transfer in colloidal core-shell Q-dots in solution and in a Q-dot layer — •Uwe Kaiser¹, Robert Malinowski¹, Wolfram Heimbrodt¹, Faheem Amin², Dorleta Jimnez de Aberasturi Arranz², and Wolfgang Parak² — ¹Experimental semiconductors group of Philipps-University Marburg — ²Biophotonics group of Philipps-University Marburg

There is a great interest in functionalized colloidal Q-dots (CQDs) with diameters of a few nanometers for physical as well as biological applications. A fundamental understanding of the energy transfer processes in these materials for different experimental environments is necessary.

We studied the temporal spectral behavior of CdSe quantum dots functionalized with chromophores with time resolved photoluminescence spectroscopy. With a laser pulse of a few nanoseconds we are able to observe the luminescence decay in the range of nanoseconds up to microseconds for the luminescence of the dot as well as for the chromophore.

Measurements have been done for nanoparticles in solution as well as on particles transferred to a substrate. The fluorescence resonant energy transfer (FRET) between the dot and the chromophores has been studied in a temperature range between 10K and room temperature. A detailed comparison of the FRET process will be presented for the Q-dots in different environments.