SKM 2021 – wissenschaftliches Programm
CPP 10: Organic Electronics and Photovoltaics, Electrical and Optical Properties (joint session CPP/KFM)
CPP 10.7: Vortrag
Donnerstag, 30. September 2021, 15:30–15:45, H3
Tunability of the Circular Dichroism through Photoluminescent Moiré Patterns — •Olha Aftenieva1 and Tobias A.F. König1,2 — 1Leibniz Institute for Polymer Research Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany — 2Center for Advancing Electronics Dresden (cfaed) Technische Universität Dresden 01062 Dresden, Germany
In nanophotonics, there is a current demand for ultrathin, flexible nanostructures that are simultaneously easily tunable, demonstrate a high contrast, and have a strong response in photoluminescent polarization. In this work, the template-assisted self-assembly of water-dispersed colloidal core-shell quantum dots into 1D light-emitting sub-micrometer gratings on a flexible substrate is demonstrated. Combining such structures with a light-absorbing metallic counterpart by simple stacking at various angles results in a tunable Moiré pattern with strong lateral contrast. Furthermore, a combination with an identical emitter-based grating leads to a chiroptical effect with a remarkably high degree of polarization of 0.72. Such a structure demonstrates direct circular polarized photoluminescence, for the first time, without a need for an additional chiral template as an intermediary. The suggested approach allows for reproducible, large-area manufacturing at reasonable costs and is of potential use for chiroptical sensors, photonic circuit applications, or preventing counterfeit.