Excitons in two dimensional Ruddlesden Popper perovskites (RPPs) exhibit large and tunable binding energies, making them promising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materi-als holds potential for light-harvesting technologies and nanoscale interconnects. Here, using cathodoluminescence spectros-copy, we demonstrate that exciton energy can be transferred over ultralong distances, up to 150 micrometers, in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is enabled by efficient exciton coupling to defect centers in hBN and subsequent defect defect interactions. This mechanism not only facilitates long-range energy transfer, but also leads to enhanced luminescence intensity, narrower emission linewidths, extended exciton lifetimes, and reduced electron-beam-induced degradation. Owing to the high density of emitters within the hBN layers, the investigated van der Waals heterostructure emerges as a robust and stable hybrid platform. Our findings open promising pathways for room-temperature excitonic devices with enhanced performance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.
@article{arxiv.2504.12024,
title = {Exciton Energy Routing via Defect Networks in hBN/2D-Perovskite Hybrids},
author = {Sara Darbari and Paul Bittorf and Leon Multerer and Fatemeh Chahshouri and Parsa Darman and Pavel Ruchka and Harald Giessen and Masoud Taleb and Yaser Abdi and Nahid Talebi},
journal= {arXiv preprint arXiv:2504.12024},
year = {2025}
}