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题名: Excessive Exoergicity Reduces Singlet Exciton Fission Efficiency of Heteroacenes in Solutions
作者: Zhang, You-Dan1; Wu, Yishi2, 3; Xu, Yanqing4, 5; Wang, Qiang1; Liu, Ke1; Chen, Jian-Wei2, 3; Cao, Jing-Jing1; Zhang, Chunfeng4, 5; Fu, Hongbing2, 3; Zhang, Hao-Li1
刊名: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
发表日期: 2016-06-01
卷: 138, 期:21, 页:6739-6745
收录类别: SCI
英文摘要: The energy difference between a singlet exciton and twice of a triplet exciton, Delta E-SF, provides the thermodynamic driving force for singlet exciton fission (SF). This work reports a systematic investigation on the effect of Delta E-SF on SF efficiency of five heteroacenes in their solutions. The low-temperature, near-infrared phosphorescence spectra gave the energy levels of the triplet excitons, allowing us to identify the values of Delta E-SF, which are -0.58, -0.34, -0.31, -0.32, and -0.34 eV for the thiophene, benzene, pyridine, and two tetrafluorobenzene terminated molecules, respectively. Corresponding SF efficiencies of the five heteroacenes in 0.02 M solutions were determined via femtosecond transient absorption spectroscopy to be 117%, 124%, 140%, 132%, and 135%, respectively. This result reveals that higher Delta E-SF is not, as commonly expected, always beneficial for higher SF efficiency in solution phase. On the contrary, excessive exoergicity results in reduction of SF efficiency in the heteroacenes due to the promotion of other competitive exciton relaxation pathways. Therefore, it is important to optimize thermodynamic driving force when organic materials for high SF efficiency.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35774
Appears in Collections:分子动态与稳态结构实验室_期刊论文

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作者单位: 1.Lanzhou Univ, Coll Chem & Chem Engn, Key Lab Special Funct Mat & Struct Design MOE, SKLAOC, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China
4.Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
5.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
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