The first decade of perovskite quantum dots (in our lab)
Maksym Kovalenko a b
a ETH Zürich, Department of Chemistry and Applied Biosciences, Switzerland, Switzerland
b Laboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories For Materials Science and Technology, Switzerland
Proceedings of Emerging Light Emitting Materials 2024 (EMLEM24)
La Canea, Greece, 2024 October 16th - 18th
Organizers: Grigorios Itskos, Sohee Jeong and Jacky Even
Invited Speaker, Maksym Kovalenko, presentation 012
DOI: https://doi.org/10.29363/nanoge.emlem.2024.012
Publication date: 13th July 2024

This lecture will span the discovery of colloidal lead halide perovskite nanocrystals (LHP NCs), as well as our latest work on their synthesis, self-organization, and optical properties, including unpublished work. LHP NCs are of broad interest as classical light sources (LED/LCD displays) and as quantum light sources (quantum sensing and imaging, quantum communication, optical quantum computing). The current development in LHP NC surface chemistry, using designer phospholipid capping ligands, allows for increased stability down to single particle level [1]. The brightness of such a quantum emitter is ultimately described by Fermi’s golden rule, where a radiative rate proportional to its oscillator strength (intrinsic emitter property) and the local density of photonic states (photonic engineering, i.e. cavity). With perovskite NCs, we present a record-low sub-100 ps radiative decay time for CsPb(Br/Cl)3, almost as short as the reported exciton coherence time, by the NC size increase to 30 nm [2]. The characteristic dependence of radiative rates on QD size, composition, and temperature suggests the formation of giant transition dipoles, as confirmed by effective-mass calculations for the case of the giant oscillator strength. Importantly, the fast radiative rate is achieved along with the single-photon emission despite the NC size being ten times larger than the exciton Bohr radius. When such bright and coherent QDs are assembled into superlattices, collective properties emerge, such as superradiant emission from the inter-NC coupling [3,4].

© FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info