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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Photon upconversion in multicomponent systems: Role of back energy transfer
Diletta Meroni1, Angelo Monguzzi1, Francesco Meinardi1
1Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, via R. Cozzi 55, I-20125 Milano, Italy.
Photon upconversion enhances light emission by transferring energy between molecules. This study optimizes this process by managing energy transfer to maximize light output and overcome efficiency losses.
Area of Science:
- Photochemistry
- Materials Science
- Spectroscopy
Background:
- Photon upconversion utilizes sensitized triplet-triplet annihilation (TTA) in bi-component systems.
- This process involves triplet-triplet energy transfer (ET) from a donor to an acceptor moiety.
- The goal is to sensitize optically dark triplets for high-energy photoluminescence.
Purpose of the Study:
- To analyze a model system where donor-acceptor triplet energy difference is less than kBT.
- To develop a kinetic model for iterative exciton transfer between donor and acceptor molecules.
- To provide guidelines for optimizing system composition and overcoming detrimental back-ET effects.
Main Methods:
- Time-resolved photoluminescence spectroscopy.
- Steady-state photoluminescence spectroscopy.
- Kinetic modeling of triplet exciton dynamics.
Main Results:
- Characterization of iterative triplet exciton transfer between donor and acceptor molecules.
- Identification of the impact of small triplet energy differences on system performance.
- Development of a kinetic model to describe the upconversion process.
Conclusions:
- Optimizing bi-component systems requires careful management of triplet-triplet energy transfer.
- Overcoming back-ET is crucial for maximizing upconversion quantum yield.
- The developed kinetic model offers insights for designing efficient photon upconversion materials.
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