Publication date: 15th December 2025
Metal-halide perovskites exhibit bright and sharp luminescence, with optoelectronic and structural properties that can be tuned over a wide range through solution processing [1,2]. In this talk, I will discuss our realisation of linearly polarised luminescence from perovskite light-emitting diodes (LEDs) [3]. This is achieved by self-assembling CsPbI3 nanoplatelets into an edge-up orientation. Through strong dielectric and quantum confinement, there is a 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 [3]. I will discuss the design principles for passivating ligands to improve the luminescent properties [4], how the bulk composition could be engineered to improve stability [5], and how the coordinating ligands could be tuned to control the orientation of these nanoplatelet superlattices [6].
I thank the UK Research and Innovation for support through a Frontier Grant (no. EP/X029900/1), awarded through the 2021 ERC Starting Grant scheme. I also thank St. John's College for financial support through the Large Grant scheme and the Welcome grant scheme.
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