Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 46: Quantum dots and wires: Optical properties III
HL 46.5: Talk
Thursday, March 15, 2018, 16:00–16:15, A 151
The Influence of the Individual Particles on the Ensemble Quantum Yield of Elongated CdSe/CdS Core/Shell Nanoparticles — •Alexandra Hinsch1, Christian Strelow1, Tobias Kipp1, Christian Würth2, Daniel Geißler2, Ute Resch-Genger2, and Alf Mews1 — 1Universität Hamburg, Grindelallee 117, 20146 Hamburg, Deutschland — 2Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Straße 11, 12489 Berlin, Deutschland
Colloidal semiconductor nanoparticles with a spherical core and an elongated shell form bright emitters with a high absorption cross section. They show great potential for a multitude of opto-electronic applications such as LEDs or photovoltaic cells and can be used as gain material or as markers for bio imaging. For most of these applications high fluorescence quantum yields are a figure of merit for the emitter quality. Our previous work showed that the ensemble quantum yields depend strongly on the shell size and the excitation wavelength [1]. In this work we investigate how the ensemble quantum yield is affected by the properties of the individual particles. In particular, we prove the role of non-emitting particles as well as the role of blinking. Using a combination of AFM and spatially resolved photoluminescence spectroscopy we measured hundreds of individual CdSe/CdS dot/rod particles of different shell lengths exciting with two different excitation wavelengths for shell or core excitation, respectively.
[1] D. Geißler, C. Würth, C. Wolter, H. Weller, U. Resch-Genger, Physical Chemistry Chemical Physics 2017, 19, 12509-12516.