Publication date: 5th November 2025
Two-dimensional (2D) metal halide perovskites have shown promise as materials for a wide range of technology including solar cells, photodetectors, transistors, spintronic devices, memory devices, and ionizing-radiation detectors. The presence of stable excitons at room temperature in 2D perovskites also provides an ideal medium for light-emitting applications and a testbed for exciton physics. 2D perovskites have unique magneto-optical properties which have provided a comprehensive insight into the energy and spin structure of their exciton states. Materials with a strong optical response to external magnetic fields are highly desirable for applications in sensing and photonics, so the ability to tune this response presents a pathway to develop a new class of magneto-optical devices. This presentation will include an overview of magnetic field effects of excitons in 2D perovskites, and their significance in optoelectronics applications. Following this, the latest work using magneto-photoluminescence (MPL) spectroscopy will be presented, showing the influence of both intrinsic and extrinsic factors on the magneto-optical properties of 2D perovskites via modifying the energy splitting between bright and dark excitons. Magneto-optical microscopy reveals localised populations of these states in thin films and single crystals, highlighting the heterogenous nature of exciton emission. Finally, we show how a 15× enhancement in MPL can be achieved in colloidal 2D perovskite nanosheets at room temperature. Our findings provide critical insight into excitons in 2D perovskites and their effect on light-emitting properties. This work is highly relevant for the development of 2D perovskite optoelectronics and paves the way for new applications including magnetometry.
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