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Evidence for Singlet Fission Driven by Vibronic Coherence in Crystalline Tetracene

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2]
  1. The Ohio State Univ., Columbus, OH (United States); The Ohio State University
  2. The Ohio State Univ., Columbus, OH (United States)
Singlet fission proceeds rapidly and with high quantum efficiency in both crystalline tetracene and pentacene, which poses a conundrum given that the process in tetracene is disfavored by the electronic energetics. In this work, we use an ab initio exciton model to compute nonadiabatic couplings in the unit cell of tetracene in order to identify the modes that promote this process. Four intramolecular modes in the range of 1400–1600 cm–1, which are nearly resonant with the single-exciton/multiexciton energy gap, appear to play a key role. Ab initio calculations of the electron/phonon coupling constants for these modes reveal that they are almost entirely of “Holstein” type, modulating the site energies rather than the intersite couplings. The constants are used to parametrize a vibronic Hamiltonian, simulations with which suggest a vibronically coherent singlet fission mechanism that proceeds spontaneously despite unfavorable electronic energetics. In the absence of vibronic coupling, there is no significant fission according to our model.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0008850
OSTI ID:
1604466
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 7 Vol. 8; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (21)

Tensor network simulation of multi-environmental open quantum dynamics via machine learning and entanglement renormalisation journal March 2019
Theoretical Studies of Singlet Fission: Searching for Materials and Exploring Mechanisms journal February 2018
Searching for Diradicaloid Chromophores with Efficient Singlet Fission: Cyano‐Group Substitution of Difuropyrene Systems journal May 2019
Double‐buffered, heterogeneous CPU + GPU integral digestion algorithm for single‐excitation calculations involving a large number of excited states journal October 2018
Coupled double triplet state in singlet fission journal January 2018
Intra- and intermolecular interaction of anthracene moieties in 7,8-disilabicyclo[3.3.0]octadienyl-bridged bisanthracenes journal January 2018
Topology of quantum coherence networks in singlet fission: mapping exciton states into real space and the dislocation induced three dimensional manifolds journal January 2020
Singlet fission in a hexacene dimer: energetics dictate dynamics journal January 2020
Description of ground and excited electronic states by ensemble density functional method with extended active space journal August 2017
Vibronic exciton theory of singlet fission. III. How vibronic coupling and thermodynamics promote rapid triplet generation in pentacene crystals journal June 2018
Modeling the effects of molecular disorder on the properties of Frenkel excitons in organic molecular semiconductors journal September 2018
Removing instabilities in the hierarchical equations of motion: Exact and approximate projection approaches journal May 2019
Quantum dynamical simulation of intramolecular singlet fission in covalently coupled pentacene dimers journal July 2019
Weakly coupled triplet pair states probed by quantum beating in delayed fluorescence in tetracene crystals journal October 2019
Vibronic fingerprint of singlet fission in hexacene journal August 2019
Structure and photophysics of indigoids for singlet fission: Cibalackrot journal November 2019
Time-dependent density matrix renormalization group quantum dynamics for realistic chemical systems journal December 2019
Multiset Matrix Product State Calculations Reveal Mobile Franck-Condon Excitations Under Strong Holstein-Type Coupling journal September 2019
Vibronic exciton theory of singlet fission. III. How vibronic coupling and thermodynamics promote rapid triplet generation in pentacene crystals text January 2018
Multi-set matrix product state calculations reveal mobile Franck-Condon excitations under strong Holstein-type coupling text January 2018
Time-dependent Density Matrix Renormalization Group Quantum Dynamics for Realistic Chemical Systems text January 2019

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