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 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 fissi...

Full description

Saved in:
Bibliographic Details
Published in:The journal of physical chemistry letters 2019-05, Vol.10 (10), p.2428-2433
Main Authors: Ni, Wenjun, Gurzadyan, Gagik G, Zhao, Jianzhang, Che, Yuanyuan, Li, Xiaoxin, Sun, Licheng
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.9b00717