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- W2890176823 abstract "Singlet fission (SF) is expected to exceed the theoretical limit of the solar cell efficiency. Quintet (Q) state generation in triplet–triplet pair is essential for preventing the unwanted loss of SF-born multiexciton through singlet channels, although little is known on the primary multiexciton spin dynamics following the intermolecular SF. In this study, time-resolved EPR revealed the intermolecular multiexciton dynamics, energetics and geometries in aggregated 6,13-bis(triisopropylsilylethynyl)pentacene and 2-phenyl-6,11-bis(triisopropylsilylethynyl)tetracene in diluted frozen solution. We have demonstrated sublevel selective generations of excited quintet states (|Q0⟩, |Q–1⟩ and |Q–2⟩) by singlet–quintet (SQ) mixings during triplet-exciton diffusions within geminate multiexcitons. The present fundamental characteristics of the quintet generations shows strong impact of coexistence of molecularly ordered “hot spot” and disordered regions for exergonic SQ mixings driven by entropy, thereby paving a new avenue for rational designs of organic devices with controlled multiexciton dynamics by optimizing film morphologies." @default.
- W2890176823 created "2018-09-27" @default.
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- W2890176823 date "2018-09-18" @default.
- W2890176823 modified "2023-10-18" @default.
- W2890176823 title "Singlet-Fission-Born Quintet State: Sublevel Selections and Trapping by Multiexciton Thermodynamics" @default.
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- W2890176823 doi "https://doi.org/10.1021/acs.jpclett.8b02396" @default.
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