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L Latterini1, G Massaro, M Penconi

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Summary

Molecular dye pairs like platinum(ii) octaethylporphyrin (PtOEP) and tetraphenylpyrene (TPPy) enable efficient radiation upconversion via triplet-triplet annihilation. This study confirms upconversion in diverse media, including confined solid-state materials, for energy applications.

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Area of Science:

  • Photochemistry and Materials Science
  • Energy Conversion and Storage

Background:

  • Radiation upconversion is a key strategy for waste reduction in energy harvesting and storage.
  • Triplet-triplet annihilation (TTA) upconversion using molecular dyes offers versatility but requires thorough photophysical characterization for optimization.
  • Developing efficient upconversion systems is crucial for advancing technological applications.

Purpose of the Study:

  • To investigate the photophysical properties and upconversion efficiencies of a molecular dye pair (PtOEP/TPPy) in various media.
  • To characterize the performance of TTA upconversion in homogeneous solvents, microemulsions, and solid-state materials.
  • To explore the feasibility of upconversion in confined and rigid environments.

Main Methods:

  • Utilized a sensitizer (2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(ii), PtOEP) and an emitter (1,3,6,8-tetraphenylpyrene, TPPy) for triplet-triplet annihilation upconversion.
  • Evaluated upconversion efficiencies in solvents of varying viscosities and oil-in-water microemulsions.
  • Tested upconversion in nanostructured silica matrices and liquid-filled microcapsules.

Main Results:

  • Successfully demonstrated and characterized triplet-triplet annihilation based upconversion with the PtOEP/TPPy dye pair.
  • Upconversion efficiencies were analyzed across different solvent viscosities and in microemulsion systems.
  • Confirmed the possibility of achieving upconversion emission in confined and rigid solid materials, such as silica matrices and microcapsules.

Conclusions:

  • The PtOEP/TPPy molecular dye pair is effective for triplet-triplet annihilation upconversion across a range of media.
  • Upconversion is feasible even in confined and rigid environments, expanding potential applications.
  • This research provides a foundation for designing advanced materials for energy harvesting and storage using upconversion principles.