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Triplet Transfer Mediates Triplet Pair Separation during Singlet Fission in 6,13‐Bis(triisopropylsilylethynyl)‐Pentacene
Author(s) -
Grieco Christopher,
Doucette Grayson S.,
Munro Jason M.,
Kennehan Eric R.,
Lee Youngmin,
Rimshaw Adam,
Payne Marcia M.,
Wonderling Nichole,
Anthony John E.,
Dabo Ismaila,
Gomez Enrique D.,
Asbury John B.
Publication year - 2017
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.201703929
Subject(s) - singlet fission , pentacene , singlet state , materials science , chemical physics , excitation , triplet state , fission , molecule , molecular physics , atomic physics , chemistry , physics , excited state , nanotechnology , organic chemistry , layer (electronics) , quantum mechanics , thin film transistor , neutron
Triplet population dynamics of solution cast films of isolated polymorphs of 6,13‐bis(triisopropylsilylethynyl) pentacene (TIPS‐Pn) provide quantitative experimental evidence that triplet excitation energy transfer is the dominant mechanism for correlated triplet pair (CTP) separation during singlet fission. Variations in CTP separation rates are compared for polymorphs of TIPS‐Pn with their triplet diffusion characteristics that are controlled by their crystal structures. Since triplet energy transfer is a spin‐forbidden process requiring direct wavefunction overlap, simple calculations of electron and hole transfer integrals are used to predict how molecular packing arrangements would influence triplet transfer rates. The transfer integrals reveal how differences in the packing arrangements affect electronic interactions between pairs of TIPS‐Pn molecules, which are correlated with the relative rates of CTP separation in the polymorphs. These findings suggest that relatively simple computations in conjunction with measurements of molecular packing structures may be used as screening tools to predict a priori whether new types of singlet fission sensitizers have the potential to undergo fast separation of CTP states to form multiplied triplets.