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This study introduces a novel solid-state photon upconversion method using a singlet energy collector. This approach enhances energy transfer efficiency and doubles fluorescence quantum yield for better renewable energy devices.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Renewable Energy

Background:

  • Solid-state photon upconversion (TTA-UC) is crucial for renewable energy, but efficiency is limited by chromophore aggregation and back energy transfer.
  • Low fluorescence quantum yields in solid materials hinder the potential of TTA-UC devices.

Purpose of the Study:

  • To overcome limitations in solid-state TTA-UC by introducing a highly fluorescent singlet energy collector.
  • To enable dual energy migration (triplet and singlet) for enhanced upconversion efficiency.

Main Methods:

  • Fabrication of donor-doped acceptor crystalline films using spin-coating.
  • Incorporation of Pt(II) octaethylporphyrin (PtOEP) as triplet donor and 2,5,8,11-tetra-tert-butylperylene (TTBP) as singlet energy collector.
  • Characterization of exciton diffusion and energy transfer dynamics.

Main Results:

  • Achieved effective singlet exciton diffusion over ~37 nm in nanofibrous acceptor crystals.
  • Doubled solid-state fluorescent quantum yield to 76% with only 0.5 mol% TTBP.
  • Inhibited singlet back energy transfer by isolating donor and collector molecules.
  • Increased upconversion efficiency to 9.0%.

Conclusions:

  • The developed scheme with a singlet energy collector and dual energy migration significantly enhances solid-state TTA-UC efficiency.
  • Rational design principles for efficient solid-state upconverters were established.
  • This approach offers a promising pathway for advanced renewable energy technologies.