AI Article Synopsis
- Recent research highlights the importance of two-dimensional metal halide perovskites, particularly Ruddlesden-Popper types, for their potential in light generation and stabilizing their 3D versions.
- The common belief that broad luminescence in these materials is due to self-trapped excitons from strong carrier-phonon interactions is challenged by new findings.
- Investigating lead-iodide single crystals reveals that the broad emission originates from in-gap states in the crystal, prompting a reevaluation of the assumptions surrounding luminescence in metal halide perovskites.
Article Abstract
Two-dimensional metal halide perovskites of Ruddlesden-Popper type have recently moved into the centre of attention of perovskite research due to their potential for light generation and for stabilisation of their 3D counterparts. It has become widespread in the field to attribute broad luminescence with a large Stokes shift to self-trapped excitons, forming due to strong carrier-phonon interactions in these compounds. Contrarily, by investigating the behaviour of two types of lead-iodide based single crystals, we here highlight the extrinsic origin of their broad band emission. As shown by below-gap excitation, in-gap states in the crystal bulk are responsible for the broad emission. With this insight, we further the understanding of the emission properties of low-dimensional perovskites and question the generality of the attribution of broad band emission in metal halide perovskite and related compounds to self-trapped excitons.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7214453 | PMC |
| http://dx.doi.org/10.1038/s41467-020-15970-x | DOI Listing |
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