Abstract

Excitons in two-dimensional Rud-dlesden–Popper perovskites (RPPs) exhibit large and tunable binding energies, making them prom-ising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materials holds potential for light-har-vesting technologies and nanoscale intercon-nects. Here, using cathodoluminescence spectros-copy, we demonstrate that exciton energy can be transferred over ultralong distances - up to 150 μm - in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is en-abled by efficient exciton coupling to defect cen-ters in hBN and subsequent defect-defect interac-tions. This mechanism not only facilitates long-range energy transfer, but also leads to enhanced luminescence intensity, narrower emission lin-ewidths, 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 per-formance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.

Abstract

Excitons in two-dimensional Rud-dlesden–Popper perovskites (RPPs) exhibit large and tunable binding energies, making them prom-ising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materials holds potential for light-har-vesting technologies and nanoscale intercon-nects. Here, using cathodoluminescence spectros-copy, we demonstrate that exciton energy can be transferred over ultralong distances - up to 150 μm - in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is en-abled by efficient exciton coupling to defect cen-ters in hBN and subsequent defect-defect interac-tions. This mechanism not only facilitates long-range energy transfer, but also leads to enhanced luminescence intensity, narrower emission lin-ewidths, 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 per-formance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.

Abstract

Excitons in two-dimensional Rud-dlesden–Popper perovskites (RPPs) exhibit large and tunable binding energies, making them prom-ising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materials holds potential for light-har-vesting technologies and nanoscale intercon-nects. Here, using cathodoluminescence spectros-copy, we demonstrate that exciton energy can be transferred over ultralong distances - up to 150 μm - in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is en-abled by efficient exciton coupling to defect cen-ters in hBN and subsequent defect-defect interac-tions. This mechanism not only facilitates long-range energy transfer, but also leads to enhanced luminescence intensity, narrower emission lin-ewidths, 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 per-formance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.

Abstract

Excitons in two-dimensional Rud-dlesden–Popper perovskites (RPPs) exhibit large and tunable binding energies, making them prom-ising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materials holds potential for light-har-vesting technologies and nanoscale intercon-nects. Here, using cathodoluminescence spectros-copy, we demonstrate that exciton energy can be transferred over ultralong distances - up to 150 μm - in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is en-abled by efficient exciton coupling to defect cen-ters in hBN and subsequent defect-defect interac-tions. This mechanism not only facilitates long-range energy transfer, but also leads to enhanced luminescence intensity, narrower emission lin-ewidths, 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 per-formance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.