Understanding the Bound Triplet-Pair State in Singlet Fission

被引：81

作者：

Sanders, Samuel N. ^{[1
]}

Pun, Andrew B. ^{[1
]}

Parenti, Kaia R. ^{[1
]}

Kumarasamy, Elango ^{[1
]}

Yablon, Lauren M. ^{[1
]}

Sfeir, Matthew Y. ^{[2
,3
]}

Compos, Luis M. ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem, New York, NY 10027 USA

[2] CUNY, Photon Initiat Adv Sci Res Ctr, New York, NY 10031 USA

[3] CUNY, Grad Ctr, Dept Phys, New York, NY 10016 USA

来源：

CHEM | 2019年 / 5卷 / 08期

关键词：

EXCITON-FISSION; QUANTUM EFFICIENCY; SOLAR-CELLS; PENTACENE; TETRACENE; DYNAMICS; COHERENT; FLUORESCENCE; PHOTOPHYSICS; 100-PERCENT;

D O I：

10.1016/j.chempr.2019.05.012

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Singlet fission is a photophysical process in which two triplet excitons are produced from one singlet exciton. Understanding the details of this process, especially the properties of intermediates between singlet excitons and free triplet excitons, is particularly important to its optimization and application. Herein, we explore the bound triplet pair, (m)(T-1 T-1), an important intermediate state in singlet fission. We highlight a growing number of studies indicating there is an energetic stabilization of triplet-pair states relative to free triplets. This stabilization enables endothermic singlet fission processes and often results in long lifetimes of the bound triplet-pair state. However, triplets in close proximity demonstrate heightened recombination and reduced excited-state lifetimes. The ubiquity of bound triplet-pair states in recent reports indicates the importance of this state, the need to discern it from free triplets, and the usefulness of having carefully tuned interactions between triplets produced by singlet fission.

引用

页码：1988 / 2005

页数：18

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