Publication date: 8th July 2026
Two-dimensional (2D) halide perovskites have emerged as a versatile platform for tunable optoelectronic materials, owing to their layered crystal structure and chemical flexibility. In these materials, organic spacer ligands separate the inorganic perovskite layers and play a central role in governing structural rigidity, charge transport, and light emission. Understanding how spacer chemistry influences excited-state processes is therefore essential for rational materials design.
In this talk, I will present a comparative study of manganese (Mn)-doped 2D perovskites incorporating either aromatic phenethylammonium (PEA) or aliphatic butylammonium (BA) spacer ligands. Mn doping provides a robust route to achieving strong, broadband luminescence, yet the interplay between dopant emission, exciton transport, and spacer identity remains poorly understood. By systematically varying Mn concentration and sample morphology, from nanoplatelets to bulk crystals, we uncover distinct doping regimes, including edge-localized Mn incorporation at high doping levels and uniform dopant distribution at lower concentrations.
Despite similar Mn incorporation behavior, the two spacers lead to markedly different optical responses. PEA-based perovskites exhibit significantly stronger Mn-related emission than their BA-based counterparts. Using transient reflection microscopy, we directly probe exciton transport and find nearly a twofold enhancement in exciton diffusivity for PEA systems. These differences are correlated with crystal rigidity and exciton–phonon coupling.
Overall, this work highlights how organic spacer ligands control both charge mobility and luminescence in 2D perovskites, offering design principles for next-generation light-emitting materials.
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