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Area of Science:

  • Materials Science
  • Photochemistry
  • Renewable Energy

Background:

  • Triplet-triplet annihilation-based photon upconversion (TTA-UC) is crucial for sunlight-powered renewable energy.
  • Existing TTA-UC systems often lack efficiency, require high power, or are sensitive to oxygen.

Purpose of the Study:

  • To develop a novel self-assembly approach for highly efficient, low-power, and oxygen-tolerant TTA-UC.
  • To create a supramolecular light-harvesting system for improved photon upconversion.

Main Methods:

  • Designed a lipophilic 9,10-diphenylanthracene-based emitter with hydrogen-bonding moieties.
  • Utilized spontaneous co-assembly with a triplet sensitizer in organic media.
  • Investigated triplet sensitization and energy migration in the self-assembled system.

Main Results:

  • Achieved efficient TTA-UC via self-assembly, demonstrating significant triplet sensitization and energy migration.
  • Obtained a high upconversion (UC) quantum yield of 30% at low excitation power in deaerated conditions.
  • Demonstrated substantial UC emission retention in air-saturated solutions and applicability to organogels and solid films.

Conclusions:

  • The novel self-assembly approach enables highly efficient TTA-UC, overcoming oxygen sensitivity limitations.
  • This method provides a facile route to advanced supramolecular light-harvesting systems for renewable energy applications.
  • The developed system shows promise for practical applications in organogel and solid-film formats.