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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Bibliographic Details
Published in:	The journal of physical chemistry letters Vol. 10; no. 10; p. 2428
Main Authors:	Ni, Wenjun, Gurzadyan, Gagik G, Zhao, Jianzhang, Che, Yuanyuan, Li, Xiaoxin, Sun, Licheng
Format:	Journal Article
Language:	English
Published:	United States 16.05.2019
ISSN:	1948-7185, 1948-7185
Online Access:	Get more information
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1948-7185 1948-7185
DOI:	10.1021/acs.jpclett.9b00717