Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Heterostructures, interfaces, and surfaces

HL 30.5: Talk

Wednesday, March 14, 2018, 16:00–16:15, EW 202

Spectroscopic examination and theoretical modelling of fluorescence spectral diffusion of CdSe/CdS dotrods — •Sven-Hendrik Lohmann, Philip Harder, Felix Bourier, Christian Strelow, Tobias Kipp, and Alf Mews — Institute für Physikalische Chemie ,Universität Hamburg, Grindelallee 117, 20146 Hamburg, Deutschland

Here we investigate the photoluminescence properties, more specifically the spectral diffusion, of individual chemically-synthesized CdSe/CdS nanoparticles, which consist of a spherical core enclosed by an elongated shell. Time- and energy-resolved photoluminescence data were collected at low temperature to analyze the spectral diffusion of the emission. The observed correlation between the energy and the decay time of the emission was used to develop a theoretical model, which includes migrating surface charges to describe the fluorescence jittering. Our initial model calculations already show a good agreement with our experimental studies.[1] In the next step, the model was refined by the incorporation of strain effects and the geometric parameters as well as different material compositions were investigated in respect to spectral diffusion.

[1] S.-H. Lohmann, C. Strelow, A. Mews, T. Kipp, ACS Nano 2017, DOI 10.1021/acsnano.7b05303.