Publication date: 15th December 2025
Perovskite luminescent materials have been extensively investigated owing to their strong excitonic effects, high photoluminescence quantum yield, and simple processability. Among them, structures integrating organic and inorganic components, such as conventional Ruddlesden-Popper layered perovskites, offer a degree of structural versatility that is difficult to achieve in other classes of luminescent materials. This tunability arises largely from the crucial role of the organic molecules, which act as an effective channel for modifying the crystallographic framework and, consequently, enabling emission tunability. Through appropriate ligand selection, it becomes possible to control emission bandwidth, color purity, and even promote the emergence of broadband or white-light photoluminescence. In this work, we investigate a family of organic cations by systematically varying the alkyl-chain length and the number of aromatic rings, using a straightforward room-temperature synthesis to evaluate their influence on the optoelectronic properties of the resulting structures. Our results reveal a clear morphological switch from typical platelet-like crystals to elongated microstructures as the alkyl chain supporting the aromatic ring increases in length. This morphological evolution is reflected in the emission behavior of the samples, with a transition from narrow blue to broadband white light, and quantum yields reaching up to 10% in perovskite-related structures that exhibit terraces or grooved surfaces. The interplay between organic cation bulk and packing constraints emerges as key parameters leading to the observed structural and optical changes. Our findings, therefore, provide valuable guidelines for identifying molecular descriptors in organic cations that can disrupt the conventional layered architecture and enable white light emission across distinct crystalline morphologies.
M.P.A. acknowledges funding from the European Research Council through the ERC Consolidator Grant EVA (grant agreement no. 101124411). The authors thank the following facilities at the Istituto Italiano di Tecnologia for their technical support: Material Characterization, Electron Microscopy, and the Chemistry Facility
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.