Exciton Diffusion and Annihilation in Nanophotonic Purcell Landscapes
Author(s)
Raziman, TV
Visser, C Peter
Wang, Shaojun
Gomez Rivas, Jaime
Curto, Alberto G
Type
Journal Article
Abstract
Excitons spread through diffusion and interact through exciton–exciton annihilation. Nanophotonics can counteract the resulting decrease in light emission. However, conventional enhancement treats emitters as immobile and non-interacting. It neglects exciton redistribution between regions with different enhancements and the increase in non-radiative decay at high exciton densities. Here, the authors went beyond the localized Purcell effect to exploit exciton dynamics and turn their typically detrimental impact into additional emission. As interacting excitons diffuse through optical hotspots, the balance of excitonic and nanophotonic properties leads to either enhanced or suppressed photoluminescence. The dominant enhancement mechanisms are identified in the limits of high and low diffusion and annihilation. Diffusion lifts the requirement of spatial overlap between excitation and emission enhancements, which are harnessed to maximize emission from highly diffusive excitons. In the presence of annihilation, improved enhancement is predicted at increasing powers in nanophotonic systems dominated by emission enhancement. The guidelines are relevant for efficient and high-power light-emitting diodes and lasers tailored to the rich dynamics of excitonic materials such as monolayer semiconductors, perovskites, or organic crystals.
Date Issued
2022-09-05
Date Acceptance
2022-06-07
Citation
Advanced Optical Materials, 2022, 10 (17)
ISSN
2195-1071
Publisher
Wiley
Journal / Book Title
Advanced Optical Materials
Volume
10
Issue
17
Copyright Statement
© 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
10.1002/adom.202200103
Publication Status
Published
Article Number
2200103
Date Publish Online
2022-06-07