Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.54: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Optical Spectroscopy of Single Elongated CdSe/CdS Core/Shell Nanoparticles — •Alexandra Hinsch, Sven-Hendrik Lohmann, Christian Strelow, Tobias Kipp, and Alf Mews — Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Deutschland

Semiconductor nanoparticles show great potential for a multitude of opto-electronic applications such as LEDs or photovoltaic cells. Core/shell nanoparticles allow the tailoring of the emission wavelength via composition and size of the system. In elongated nanoparticles with a dot-like core and a rod-like shell, the length of the system is a further parameter for the control of optical properties. Here we present elongated CdSe/CdS core/shell nanoparticles with varying rod- and core-size. We show that green-fluorescent dot/rods are strongly polarized emitters at room temperature. Orange-fluorescent dot/rods with larger dots, however, exhibit a decreased degree of polarization at room temperature. At cryogenic temperatures the typical blinking of single dot/rod particles rarely occurs and an increase in polarization can be observed. We further show that it is possible to directly correlate TEM and PL measurements to visualize single measured particles.