ArticleJournal of the American Chemical Society2025
Improving Triplet-Triplet Annihilation Upconversion Output by a Triplet Mediator Approach: Mechanistic Insights on Homo and Hetero-Annihilation in Three-Component Systems.
Article in Journal of the American Chemical Society, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Not yet cited in PubMed.
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Corrections and comments
- Erratum issued
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2 authors.
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Abstract
Triplet-triplet annihilation photon upconversion (TTA-UC) is a promising strategy for converting low-energy photons into higher-energy emission, with potential applications in solar energy harvesting, bioimaging, and photocatalysis. A challenge in TTA-UC systems is minimizing the reabsorption of upconverted photons by the annihilator molecules. To address this, we present a mediator-assisted TTA-UC approach utilizing a neutral mediator molecule to facilitate upconversion in the ultraviolet (UV) and visible regions. Our study introduces a general protocol, and through detailed kinetic modeling, we elucidate the underlying mechanism, highlighting the role of hetero-TTA (triplet-triplet annihilation between the mediator and annihilator). Notably, we report the first estimation of a hetero-TTA rate constant, which exceeds the homo-TTA rate by a factor of 2. This work broadens the design space for TTA-UC systems by enabling the use of neutral, noncovalently linked mediators, expanding beyond the conventional reliance on charged or covalently tethered species.
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