牛津大学Robert L. Z. Hoye教授：Perovskite Nanoplatelets for Photonics and Future Applications in Quantum Computing

Metal-halide perovskites exhibit bright and sharp luminescence, with properties that can be tuned over a wide range through solution processing. In this talk, I will discuss our realisation of linearly polarised luminescence from perovskite light-emitting diodes (LEDs). This is achieved by self-assembling CsPbI3 nanoplatelets into an edge-up orientation. Through strong dielectric and quantum confinement, there is large exciton fine structure splitting. As a result, we achieve strong emission from out-of-plane dipoles for the optically bright excitons in these superlattices. In light-emitting diodes, this leads to a high degree of polarisation (DOP) of 74.4% in electroluminescence. We further work towards improving the stability and efficiency through compositional and ligand engineering. Exciton fine structure splitting could also enable improved performance in perovskite single photon emitters, which are one of the building blocks of quantum computing. Recent work from Bawendi and co-workers showed that metal-halide perovskite nanocrystals have a sufficiently long optical coherence to outcompete dephasing. This enables demonstrations of single photon emitters with high purity and brightness, but currently low indistinguishability ~50%. I will discuss our perspectives on the potential of making use of exciton fine structure splitting to enhance the indistinguishability. Robert Hoye is an Associate Professor of Materials Chemistry at the University of Oxford, where he is also a Fellow of St. John’s College and a Royal Academy of Engineering Senior Research Fellow. Prof. Hoye completed his PhD at the University of Cambridge (2012-2014), followed by a postdoc at MIT (2015-2016), before returning to the University of Cambridge as a College Research Fellow (2016-2019). In 2020, he moved to Imperial College London as a Lecturer, then Senior Lecturer (Aug. 2022 -). In Oct. 2022, he moved to Oxford as Associate Professor. Prof. Hoye’s group focuses on developing inorganic semiconductors for energy applications, including metal-halide perovskite nanocrystals, and discovery of lead-free perovskite-inspired materials. His group’s research spans from fundamentals (including spectroscopy and computations) to materials.