Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 46, Pages 28174-28190Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp03986a
Keywords
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Funding
- National Science Foundation [CHE-1800491, DMR-1752782]
- University of Maryland's Graduate School
- University of Maryland's Department of Materials Science and Engineering
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Triplet-triplet annihilation upconversion (TTA-UC) is a promising process for energy-harvesting and light-generation technologies. We present a mass-conserving kinetic model for TTA-UC, which considers saturation in the data and proposes alternative figures of merit for overall performance.
Triplet-triplet annihilation upconversion (TTA-UC) is a process that shows promise for applications such as energy-harvesting and light-generation technologies. The irradiance dependent performance of TTA-UC systems is typically gauged using a graphical analysis, rather than a detailed model. Additionally, kinetic models for TTA-UC rarely incorporate mass conservation, which is a phenomenon that can have important consequences under experimentally relevant conditions. We present an analytical, mass-conserving kinetic model for TTA-UC, and demonstrate that the mass-conservation constraint cannot generally be ignored. This model accounts for saturation in TTA-UC data. Saturation complicates the interpretation of the threshold irradiance I-th, a popular performance metric. We propose two alternative figures of merit for overall performance. Finally, we show that our model can robustly fit experimental data from a wide variety of sensitized TTA-UC systems, enabling the direct and accurate determination of I-th and of our proposed performance metrics. We employ this fitting procedure to benchmark and compare these metrics, using data from the literature.
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