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Strong light-matter coupling enhances near-infrared delayed fluorescence in optoelectronic devices. Aluminum nanoparticle metasurfaces boost organic layer absorption, improving fluorescence efficiency without significantly altering molecular processes.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Physical Chemistry

Background:

  • Strong light-matter coupling is crucial for optimizing optoelectronic device performance.
  • Aluminum nanoparticle metasurfaces offer unique optical properties for light manipulation.

Purpose of the Study:

  • To investigate the impact of strong light-matter coupling on thermally activated delayed fluorescence (TADF) in near-infrared emitters.
  • To explore the role of nonlocal metasurfaces in enhancing optoelectronic responses.

Main Methods:

  • Fabrication of open cavities with nonlocal metasurfaces composed of aluminum nanoparticle arrays.
  • Investigation of electronic strong coupling between metasurface surface lattice resonances and a boron difluoride curcuminoid derivative.
  • Finite-difference-time-domain (FDTD) simulations to model light-matter interactions.

Main Results:

  • Delayed fluorescence enhancement by factors of 2.0-2.6 was observed in metasurfaces tuned or detuned to molecular transitions.
  • Enhanced absorption in the organic layer due to the nanoparticle array was identified as the primary mechanism for fluorescence improvement.
  • Strong coupling was found to have negligible effects on reverse intersystem crossing rates.

Conclusions:

  • Metasurfaces can significantly enhance delayed fluorescence in organic materials through increased light absorption.
  • Understanding light-matter interactions is key to designing advanced optoelectronic devices.
  • This work provides insights into optimizing TADF emitters for practical applications.