Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Quantum dots: Optical properties I (with TT)

HL 60.2: Vortrag

Mittwoch, 2. April 2014, 09:45–10:00, POT 251

Electronic coupling and luminescence dynamics of hybrid inorganic core/organic shell nanostructures — •Stephanie Bley, Michael Diez, Angelina Vogt, Jürgen Gutowski, and Tobias Voss — Institute of Solid State Physics, Semiconductor Optics, University of Bremen, 28359 Bremen, Germany

Hybrid core/shell nanostructures allow for spectral tuning of light emission and absorption processes what is of substantial interest for light-sensing and energy harvesting applications. Here, we study the luminescence decay dynamics of colloidal CdSe quantum dots (QDs) in different solvents and on different semiconducting and insulating surfaces. The QDs are optically excited with light from an optical parametric amplifier pumped by a Ti:Sapphire laser system. The time resolved luminescence signal is detected using a streak camera. The radiative recombination processes in the quantum dots attached to different three-dimensional nanostructure surfaces can be strongly influenced by different electron tunneling processes from excited states of the quantum dots into the conduction band of the nanostructures. In this context the experimental results show that different solvents and materials significantly change the decay process of the QDs. Possible reasons for decay time variations, including different polarities of solvents and dielectric constants of the solids, will be discussed.