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Tuneable Singlet Exciton Fission and Triplet–Triplet Annihilation in an Orthogonal Pentacene Dimer
Author(s) -
Lukman Steven,
Musser Andrew J.,
Chen Kai,
Athanasopoulos Stavros,
Yong Chaw K.,
Zeng Zebing,
Ye Qun,
Chi Chunyan,
Hodgkiss Justin M.,
Wu Jishan,
Friend Richard H.,
Greenham Neil C.
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501537
Subject(s) - singlet fission , pentacene , exciton , materials science , singlet state , intramolecular force , fission , chemical physics , dimer , triplet state , relaxation (psychology) , molecular physics , molecule , photochemistry , condensed matter physics , atomic physics , nuclear magnetic resonance , nanotechnology , physics , chemistry , excited state , stereochemistry , quantum mechanics , layer (electronics) , neutron , thin film transistor , psychology , social psychology
Fast and highly efficient intramolecular singlet exciton fission in a pentacene dimer, consisting of two covalently attached, nearly orthogonal pentacene units is reported. Fission to triplet excitons from this ground state geometry occurs within 1 ps in isolated molecules in solution and dispersed solid matrices. The process exhibits a sensitivity to environmental polarity and competes with geometric relaxation in the singlet state, while subsequent triplet decay is strongly dependent on conformational freedom. The near orthogonal arrangement of the pentacene units is unlike any structure currently proposed for efficient singlet exciton fission and may lead to new molecular design rules.