| Autor: |
Chen, Renli, Jiang, Shenlong, Zhang, Qun |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 5/28/2023, Vol. 158 Issue 20, p1-5, 5p |
| Abstrakt: |
Singlet fission (SF) is a spin-allowed exciton multiplication process, in which a photogenerated singlet separates efficiently into two free triplets. Herein, we report an experimental study on the solution-phase intermolecular SF (xSF) in a prototype radical dianion system of PTCDA2−, which is produced from its neutral precursor PTCDA (i.e., perylenetetracarboxylic dianhydride) via a two-step consecutive photoinduced electron transfer mechanism. Our ultrafast spectroscopic results enable a comprehensive mapping of the elementary steps involved in the solution-phase xSF process of photoexcited PTCDA2−. Along the cascading xSF pathways, the three intermediates including excimer 1(S1S0), spin-correlated triplet pair 1(T1T1), and spatially separated triplet pair 1(T1·S0·T1) have been identified, with their formation/relaxation time constants being determined. This work demonstrates that the solution-phase xSF materials can be extended to charged radical systems and that the three-step model usually adopted to describe the crystalline-phase xSF can also be valid in describing solution-phase xSF. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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