ArticleThe journal of physical chemistry letters2024
Efficient Spin Interconversion by Molecular Conformation Dynamics of a Triplet Pair for Photon Up-Conversion in an Amorphous Solid.
Article in The journal of physical chemistry letters, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Controlling the fate of two triplet states: solid-state annihilator design for photon upconversion.Chemical science · 2026Review
- Singlet Fission in Push-Pull Para-Azaquinodimethane Films under the Gaze of Time Resolved Optical and Magnetic Spectroscopy.Angewandte Chemie (International ed. in English) · 2026Article
- Intersystem Crossing Outcompetes Triplet-Pair Separation fromJournal of the American Chemical Society · 2025Article
- Vibronic Trimer Design Enhancing Intramolecular Triplet-Exciton Hopping to Accelerate Triplet-Triplet Annihilation for Photon Upconversion.Angewandte Chemie (International ed. in English) · 2025Article
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Authors and funding
4 authors.
Funding
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Abstract
Solid-state materials with improved light-to-energy conversions in organic photovoltaics and in optoelectronics are expected to be developed by realizing efficient triplet-triplet annihilation (TTA) by manipulating the spin conversion processes to the singlet state. In this study, we elucidate the spin conversion mechanism for delayed fluorescence by TTA from a microscopic view of the molecular conformations. We examine the time evolution of the electron spin polarization of the triplet-pair state (TT state) in an amorphous solid-state system exhibiting highly efficient up-conversion emission by using time-resolved electron paramagnetic resonance. We clarified that the spin-state population of the singlet TT increased through the spin interconversion from triplet and quintet TT states during exciton diffusion with random orientation dynamics between the two triplets for the modulation of the exchange interaction, achieving a high quantum yield of up-conversion emission. This understanding provides us with a guide for the development of efficient light-to-energy conversion devices utilizing TTA.
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