Effect of Vibronic Coupling on Correlated Triplet Pair Formation in the Singlet Fission Process of Linked Tetracene Dimers

2020 ◽  
Vol 124 (18) ◽  
pp. 3641-3651 ◽  
Author(s):  
Katsuyuki Shizu ◽  
Chihaya Adachi ◽  
Hironori Kaji
Keyword(s):  
Pair Formation ◽  
Vibronic Coupling ◽  
Singlet Fission ◽  
Fission Process ◽  
Triplet Pair

scholarly journals Elucidation of Excitation Energy Dependent Correlated Triplet Pair Formation Pathways in an Endothermic Singlet Fission System

2017 ◽  
Vol 140 (13) ◽  
pp. 4613-4622 ◽  
Author(s):  
Arya Thampi ◽  
Hannah L. Stern ◽  
Alexandre Cheminal ◽  
Murad J. Y. Tayebjee ◽  
Anthony J. Petty ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Pair Formation ◽  
Singlet Fission ◽  
Triplet Pair ◽  
Energy Dependent

scholarly journals Competition between triplet pair formation and excimer-like recombination controls singlet fission yield

2021 ◽  
Vol 2 (2) ◽  
pp. 100339
Author(s):  
Yuqing Huang ◽  
Irina A. Buyanova ◽  
Chanakarn Phansa ◽  
Maria E. Sandoval-Salinas ◽  
David Casanova ◽  
...  
Keyword(s):  
Pair Formation ◽  
Singlet Fission ◽  
Fission Yield ◽  
Triplet Pair

scholarly journals Vibronically coherent ultrafast triplet-pair formation and subsequent thermally activated dissociation control efficient endothermic singlet fission

2017 ◽  
Vol 9 (12) ◽  
pp. 1205-1212 ◽  
Author(s):  
Hannah L. Stern ◽  
Alexandre Cheminal ◽  
Shane R. Yost ◽  
Katharina Broch ◽  
Sam L. Bayliss ◽  
...  
Keyword(s):  
Pair Formation ◽  
Singlet Fission ◽  
Thermally Activated ◽  
Triplet Pair

scholarly journals Vacancy control in acene blends links exothermic singlet fission to coherence

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Clemens Zeiser ◽  
Chad Cruz ◽  
David R. Reichman ◽  
Michael Seitz ◽  
Jan Hagenlocher ◽  
...  
Keyword(s):  
Thin Films ◽  
Vacancy Concentration ◽  
Tuning Parameter ◽  
Singlet Fission ◽  
Time Resolved ◽  
Fission Process ◽  
Spectroscopic Measurements ◽  
Triplet Pair ◽  
Pair Energy ◽  
Microscopic Modelling

AbstractThe fission of singlet excitons into triplet pairs in organic materials holds great technological promise, but the rational application of this phenomenon is hampered by a lack of understanding of its complex photophysics. Here, we use the controlled introduction of vacancies by means of spacer molecules in tetracene and pentacene thin films as a tuning parameter complementing experimental observables to identify the operating principles of different singlet fission pathways. Time-resolved spectroscopic measurements in combination with microscopic modelling enables us to demonstrate distinct scenarios, resulting from different singlet-to-triplet pair energy alignments. For pentacene, where fission is exothermic, coherent mixing between the photoexcited singlet and triplet-pair states is promoted by vibronic resonances, which drives the fission process with little sensitivity to the vacancy concentration. Such vibronic resonances do not occur for endothermic materials such as tetracene, for which we find fission to be fully incoherent; a process that is shown to slow down with increasing vacancy concentration.

scholarly journals Ultrafast Triplet Pair Separation and Triplet Trapping following Singlet Fission in Amorphous Pentacene Films

2020 ◽  
Vol 124 (43) ◽  
pp. 23567-23578
Author(s):  
Kyle T. Munson ◽  
Jianing Gan ◽  
Christopher Grieco ◽  
Grayson S. Doucette ◽  
John E. Anthony ◽  
...  
Keyword(s):  
Singlet Fission ◽  
Pair Separation ◽  
Triplet Pair

scholarly journals Uncovering dark multichromophoric states in Peridinin–Chlorophyll–Protein

2020 ◽  
Vol 17 (164) ◽  
pp. 20190736
Author(s):  
Elliot J. Taffet ◽  
Francesca Fassioli ◽  
Zi S. D. Toa ◽  
David Beljonne ◽  
Gregory D. Scholes
Keyword(s):  
Crystal Structure ◽  
Excited States ◽  
Quantum Chemical ◽  
Light Harvesting ◽  
Singlet Fission ◽  
Chlorophyll Protein ◽  
Triplet Pair ◽  
A Charge ◽  
Hole Generation ◽  
Chemical Evidence

It has long been recognized that visible light harvesting in Peridinin–Chlorophyll–Protein is driven by the interplay between the bright (S 2 ) and dark (S 1 ) states of peridinin (carotenoid), along with the lowest-lying bright (Q y ) and dark (Q x ) states of chlorophyll- a . Here, we analyse a chromophore cluster in the crystal structure of Peridinin–Chlorophyll–Protein, in particular, a peridinin–peridinin and a peridinin–chlorophyll- a dimer, and present quantum chemical evidence for excited states that exist beyond the confines of single peridinin and chlorophyll chromophores. These dark multichromophoric states, emanating from the intermolecular packing native to Peridinin–Chlorophyll–Protein, include a correlated triplet pair comprising neighbouring peridinin excitations and a charge-transfer interaction between peridinin and the adjacent chlorophyll- a . We surmise that such dark multichromophoric states may explain two spectral mysteries in light-harvesting pigments: the sub-200-fs singlet fission observed in carotenoid aggregates, and the sub-200-fs chlorophyll- a hole generation in Peridinin–Chlorophyll–Protein.

Competition between polaron pair formation and singlet fission observed in amorphous rubrene films

2013 ◽  
Vol 87 (22) ◽  
Author(s):  
Vygintas Jankus ◽  
Edward W. Snedden ◽  
Daniel W. Bright ◽  
Erhan Arac ◽  
DeChang Dai ◽  
...  
Keyword(s):  
Pair Formation ◽  
Singlet Fission

scholarly journals Porous Shape-Persistent Rylene Imine Cages with Tunable Optoelectronic Properties and Delayed Fluorescence

2020 ◽  
Author(s):  
Hsin-Hua Huang ◽  
Kyung Seob Song ◽  
Alessandro Prescimone ◽  
Rajesh Mannancherry ◽  
Ali Coskun ◽  
...  
Keyword(s):  
Excited State ◽  
Electronic Properties ◽  
Green Light ◽  
Delayed Fluorescence ◽  
Optoelectronic Properties ◽  
Covalent Organic Frameworks ◽  
Singlet Fission ◽  
Triplet Pair ◽  
Material Porosity

A simultaneous combination of porosity and tunable optoelectronic properties, common in covalent organic frameworks, are rare in shape-persistent organic cages. Yet, organic cages offer important molecular advantages, the solubility and modularity. Herein, we report the synthesis of a series of chiral imine organic cages with three built-in rylene units by means of dynamic imine chemistry and we investigate their textural and optoelectronic properties. Thereby we demonstrate that the synthesized rylene cages are porous, can be reversibly reduced at accessible potentials, and can absorb from UV up to green light. We also show that they preferentially adsorb CO2 over N2 and CH4 with a good selectivity. In addition, we discovered that the cage incorporating three perylene-3,4:9,10-bis(dicarboximide) units displays a delayed fluorescence, likely as a consequence of formation of a correlated triplet pair, the multiexciton state in singlet fission. Rylene cages thus represent a unique platform to investigate the effect of electronic properties on material porosity and, at the same time, to probe excited-state phenomena in the limit of vanishing interchromophore coupling. <br>

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