Enhanced Delayed Fluorescence in Nonlocal Metasurfaces: The Role of Electronic Strong Coupling

: Wei, Yu-Chen; Wang, Chih-Hsing; Daskalakis, Konstantinos S.; Chou, Pi-Tai; Murai, Shunsuke; Rivas, Jaime Gomez

Publisher: American Chemical Society (ACS)

: WASHINGTON

: 2025

: ACS Photonics

: ACS PHOTONICS

: 12

: 4

: 2193

: 2202

: 10

: 2330-4022

DOI: https://doi.org/10.1021/acsphotonics.5c00124(external)

: https://doi.org/10.1021/acsphotonics.5c00124(external)

: https://research.utu.fi/converis/portal/detail/Publication/491570625(external)

Strong light-matter coupling has garnered significant attention for its potential to optimize optoelectronic responses. In this study, we designed open cavities featuring nonlocal metasurfaces composed of aluminum nanoparticle arrays. The surface lattice resonances in these metasurfaces exhibit electronic strong coupling with the boron difluoride curcuminoid derivative, which is known for its highly efficient thermally activated delayed fluorescence in the near-infrared. Our results show that delayed fluorescence induced by triplet-triplet annihilation can be enhanced by a factor of 2.0-2.6 in metasurfaces that are either tuned or detuned to the molecular electronic transition. We demonstrate that delayed fluorescence enhancements in these systems primarily stem from increased absorption in the organic layer caused by the nanoparticle array, while strong coupling has negligible effects on reverse intersystem crossing rates, aligning with previous studies. We support these findings with finite-difference-time-domain simulations. This study elucidates how light-matter interactions affect delayed fluorescence, highlighting the potential applications in optoelectronic devices.

wei-et-al-2025-enhanced-delayed-fluorescence-in-nonlocal-metasurfaces-the-role-of-electronic-strong-coupling.pdf

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This project has received funding from the European Innovation Council through the project SCOLED (Grant Agreement Number 101098813). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Innovation Council and SMEs Executive Agency (EISMEA). Neither the European Union nor the granting authority can be held responsible for them. Y.-C.W. acknowledges support from the National Science and Technology Council (NSTC) through the postdoctoral research abroad program. Y.-C.W. thank the contribution of Goudarzi Masoumeh for measuring ellipsometry and profilometry. K.S.D has also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. [948260]). S.M. acknowledges the JSPS bilateral program (JPJSBP120239921), Japan. P.-T.C acknowledges support from NCTS (NSTC 113-2639-M-002-001 -ASP).