Julien Houel
ILM – Institut Lumière Matière
Université Claude Bernard Lyon 1
Spectroscopy of Single CdSe/CdZnS Quantum Dots in Tunable-Bandgap MAPbX3 (X=Cl, Br) Thin-Films
Since the discovery of semiconducting nanocrystals, also called quantum dots (QDs) forty years ago, they have been at the center of numerous successful applications: biological trackers, home and phone displays, light-emitting diodes, solar cells etc. This success was built on the remarkable optical properties of these nanoparticles – high fluorescence quantum yield, fast exciton dynamics with narrow emission spectra, tunability over the visible spectrum – combined with highly reproducible, industrial scale synthesis methods. There are, however, areas of Physics where colloidal QDs, more particularly CdSe-based QDs, could still find applications, as quantum light sources for example.
After a general introduction on nanocrystals, whose discoverers were awarded the Chemistry Nobel Prize in 2023, I will present our method to create hybrid CdSe/CdZnS colloidal QD single photon sources within perovskite (MAPbX3 (X=Cl, Br)) thin film matrices using a soft-chemistry method. I will present the optical properties of the matrix and the QDs at the ensemble and single particle level, from room to low temperature (4 K).
