Dynamics of the triplet-pair state reveals the likely coexistence of coherent and incoherent singlet fission in crystalline hexacene

Dynamics of the triplet-pair state reveals the likely coexistence of coherent and incoherent singlet fission in crystalline hexacene

The absorption of a photon usually creates a singlet exciton (S 1 ) in molecular systems, but in some cases S 1 may split into two triplets (2×T 1 ) in a process called singlet fission. Singlet fission is believed to proceed through the correlated triplet-pair 1 (TT) state. Here, we probe the 1 (TT)...

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Veröffentlicht in:Nature chemistry 2017-04, Vol.9 (4), p.341-346
Hauptverfasser: Monahan, Nicholas R., Sun, Dezheng, Tamura, Hiroyuki, Williams, Kristopher W., Xu, Bolei, Zhong, Yu, Kumar, Bharat, Nuckolls, Colin, Harutyunyan, Avetik R., Chen, Gugang, Dai, Hai-Lung, Beljonne, David, Rao, Yi, Zhu, X.-Y.
Format: Artikel
Sprache:eng
Schlagworte:
140/125
639/638/439/943
639/638/440/948
Absorption
Analytical Chemistry
Biochemistry
Chemistry
Chemistry/Food Science
Inorganic Chemistry
Organic Chemistry
Physical Chemistry
Theoretical analysis
Triplets
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Zusammenfassung:The absorption of a photon usually creates a singlet exciton (S 1 ) in molecular systems, but in some cases S 1 may split into two triplets (2×T 1 ) in a process called singlet fission. Singlet fission is believed to proceed through the correlated triplet-pair 1 (TT) state. Here, we probe the 1 (TT) state in crystalline hexacene using time-resolved photoemission and transient absorption spectroscopies. We find a distinctive 1 (TT) state, which decays to 2×T 1 with a time constant of 270 fs. However, the decay of S 1 and the formation of 1 (TT) occur on different timescales of 180 fs and
ISSN:1755-4330
1755-4349
DOI:10.1038/nchem.2665