Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Perovskite and Hybrid Photovolatics I (joint session HL/CPP)

CPP 53.3: Vortrag

Donnerstag, 4. April 2019, 10:00–10:15, H36

Energy transfer in films of thickness-tunable CsPbBr3 nanoplatelets — •Andreas Singldinger, Moritz Gramlich, Carola Lampe, and Alexander S. Urban — Nanospectroscopy Group, Department of Physics, Ludwig-Maximilians-Universität München (LMU), Amalienstrasse 54, 80799 Munich, Germany

In recent years, lead halide perovskites have rapidly attracted attention not only in their bulk but also in their nanocrystal form. Various synthetic routes yield highly luminescent nanocrystals of different shapes and sizes and consequently enable band gap tuning through quantum confinement effects. A novel synthesis now allows the growth of quantum-confined CsPbBr3 nanoplatelets (NPLs) with an adjustable thickness ranging from two to six unit cells. These NPLs show strong blue emission induced by a fast radiative decay of excitons. For efficient electroluminescence, however, insight into energy and charge transfer between these NPLs is crucial. Here, we look at two energy transfer processes in perovskite nanocrystal films. Firstly we study energy transfer between NPLs of different bandgaps, via time-resolved photoluminescence-spectroscopy. Secondly we investigate diffusion of photo-excited excitons in films comprising NPLs of a single thickness.