Publication date: 15th May 2026
Multilayered Ruddlesden–Popper (RP) perovskites represent a promising platform for the development of multifunctional optoelectronic materials. Their unique layered architecture enables independent tuning of structural, optical and electronic properties through the choice of organic cations and the control of their dimensionality. [1-2]
In this presentation we uncover new two-dimensional hybrid RP crystals characterised with short intralayer distance due to incorporation of new spacer cations. Thanks to unique structural characteristics and dynamics of both spacer and cage cation analysed crystals present switchable dielectric properties, persistent disorder and narrowband emission. By using multi-technique approach we were able to describe the origin of mentioned properties and propose specific emission mechanism. The optical analysis of crystals showed anomalies such as rising in intensity up to 100K and relatively steady emission. Such behaviour, when compared to classical perovskite crystals, exclude the possibility of standard decryption of bands as arising from free and bound exciton recombination and thus origin of the emission was proposed to be related to local exciton (LE) recombination. Our proposal is further supported by subsequent analysis of band gap evolution as function of temperature, which revealed that the studied crystals exhibited band gap widening up to 120K followed by band gap narrowing, which corelates with report of J. Deveikis et. al. for ThMA₂PbI₄.[3] Our results highlight the critical role of structural dynamics and disorder in governing excitonic processes in two-dimensional perovskites and provide new insights into possible emission mechanisms of these structures.
This work is financed by Polish Centre of Sience (NCN), project : OPUS 25 2023/49/B/ST5/00119, PI: Mirosław Mączka
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