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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Asymmetric BODIPY Dyes Enabling Triplet-Triplet Annihilation Upconversion
Daniel Álvarez-Gutiérrez1, Diego Sampedro2, M Consuelo Jiménez1
1Departamento de Química, Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, Spain.
ACS Applied Optical Materials
|October 4, 2024
Summary
New purely organic triplet-triplet annihilation upconversion (TTA-UC) systems utilize asymmetric BODIPY dyes as sensitizers. These systems achieve efficient green-to-blue light conversion with high upconversion efficiency at low power densities.
Area of Science:
- Organic photochemistry
- Materials science
- Supramolecular chemistry
Background:
- Triplet-triplet annihilation upconversion (TTA-UC) is explored for efficient light conversion.
- Purely organic TTA-UC systems are environmentally preferable to those using transition metals.
- BODIPY dyes are versatile scaffolds previously used as sensitizers in TTA-UC.
Purpose of the Study:
- To design and synthesize novel asymmetric BODIPY dyes for bimolecular TTA-UC.
- To investigate the upconversion efficiency and characteristics of these new BODIPY-based TTA-UC systems.
- To evaluate the potential of these BODIPY dyes as sensitizers in TTA-UC.
Main Methods:
- Synthesis of asymmetric BODIPY dyes with tailored optical properties.
- Spectroscopic investigations of bimolecular TTA-UC systems.
- Quantitative analysis of upconversion emission efficiency (ηUC) and threshold intensity (Ith).
Main Results:
- Successful preparation of asymmetric BODIPY dyes with excellent optical properties.
- Observation of clear green-to-blue light conversion in the TTA-UC system using BODIPY sensitizers and TBPe annihilator.
- Achieved high upconversion emission efficiency (ηUC) of ~8% and low threshold intensity (Ith) of ~40-50 mW/cm2.
Conclusions:
- Asymmetric BODIPY dyes are highly effective sensitizers for bimolecular TTA-UC.
- The developed TTA-UC systems demonstrate efficient light conversion at low power densities.
- These findings provide a promising design for future research in organic upconversion materials.
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