Singlet Fission from Upper Excited Electronic States of Cofacial Perylene Dimer

Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S , was detected within 50 fs. This process competes well with vibrational cooling in S (4.7-7.0 ps) and S → S internal conversion (380 fs). The singlet fission...

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Vydané v:The journal of physical chemistry letters Ročník 10; číslo 10; s. 2428
Hlavní autori: Ni, Wenjun, Gurzadyan, Gagik G, Zhao, Jianzhang, Che, Yuanyuan, Li, Xiaoxin, Sun, Licheng
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States 16.05.2019
ISSN:1948-7185, 1948-7185
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Abstract Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S , was detected within 50 fs. This process competes well with vibrational cooling in S (4.7-7.0 ps) and S → S internal conversion (380 fs). The singlet fission has the energy threshold E = 3.06 eV. Other competitive relaxation processes are excimer and dimer cation formation on an ultrafast time scale. Excitation to higher energy levels (4.96 eV) leads to a higher efficiency of singlet fission.
AbstractList Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S , was detected within 50 fs. This process competes well with vibrational cooling in S (4.7-7.0 ps) and S → S internal conversion (380 fs). The singlet fission has the energy threshold E = 3.06 eV. Other competitive relaxation processes are excimer and dimer cation formation on an ultrafast time scale. Excitation to higher energy levels (4.96 eV) leads to a higher efficiency of singlet fission.
Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S1, was detected within 50 fs. This process competes well with vibrational cooling in S1 (4.7-7.0 ps) and S2 → S1 internal conversion (380 fs). The singlet fission has the energy threshold E = 3.06 eV. Other competitive relaxation processes are excimer and dimer cation formation on an ultrafast time scale. Excitation to higher energy levels (4.96 eV) leads to a higher efficiency of singlet fission.Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S1, was detected within 50 fs. This process competes well with vibrational cooling in S1 (4.7-7.0 ps) and S2 → S1 internal conversion (380 fs). The singlet fission has the energy threshold E = 3.06 eV. Other competitive relaxation processes are excimer and dimer cation formation on an ultrafast time scale. Excitation to higher energy levels (4.96 eV) leads to a higher efficiency of singlet fission.
Author Che, Yuanyuan
Zhao, Jianzhang
Sun, Licheng
Li, Xiaoxin
Gurzadyan, Gagik G
Ni, Wenjun
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  surname: Sun
  fullname: Sun, Licheng
  organization: Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health , KTH Royal Institute of Technology , 10044 Stockholm , Sweden
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Snippet Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S , was detected...
Singlet fission directly from the upper excited vibrational and electronic states of cofacial perylene dimers, bypassing the relaxed state S1, was detected...
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Title Singlet Fission from Upper Excited Electronic States of Cofacial Perylene Dimer
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