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题名: Excessive Exoergicity Reduces Singlet Exciton Fission Efficiency of Heteroacenes in Solutions
作者: Zhang, YD; Wu, YS; Xu, YQ; Wang, Q; Liu, K; Chen, JW; Cao, JJ; Zhang, CF; Fu, HB; Zhang, HL(张浩力)
收录类别: SCIE ; EI ; MEDLINE ; BIOSIS
出版日期: 2016-06-01
刊名: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷号: 138, 期号:21, 页码:6739-6745
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.
作者部门: [Zhang, You-Dan ; Wang, Qiang ; Liu, Ke ; Cao, Jing-Jing ; Zhang, Hao-Li] Lanzhou Univ, Coll Chem & Chem Engn, Key Lab Special Funct Mat & Struct Design MOE, SKLAOC, Lanzhou 730000, Peoples R China ; [Wu, Yishi ; Chen, Jian-Wei ; Fu, Hongbing] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100190, Peoples R China ; [Wu, Yishi ; Chen, Jian-Wei ; Fu, Hongbing] Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China ; [Xu, Yanqing ; Zhang, Chunfeng] Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China ; [Xu, Yanqing ; Zhang, Chunfeng] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
通讯作者: Zhang, HL (reprint author), Lanzhou Univ, Coll Chem & Chem Engn, Key Lab Special Funct Mat & Struct Design MOE, SKLAOC, Lanzhou 730000, Peoples R China. ; Fu, HB (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100190, Peoples R China. ; Fu, HB (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China.
学科分类: Chemistry
文章类型: Article
所属项目编号: National Basic Research Program of China (973 Program) [2012CB933102] ; National Natural Science Foundation of China [NSFC 51525303, 21233001, 21190034, 21573251] ; Fundamental Research Funds for the Central Universities [lzujbky-2015-18] ; 111 Project
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划) ; 高等学校学科创新引智计划(111计划) ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; MOST ; MOE ; SAFEA ; LZU
语种: 英语
DOI: 10.1021/jacs.6b03829
ISSN号: 0002-7863
WOS记录号: WOS:000377151400012
EI记录号: 20162402486909
PM记录号: 27167770
BIOSIS记录号: BCI:BCI201600604265
IR记录号: WOS:000377151400012
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/180456
Appears in Collections:化学化工学院_期刊论文

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Recommended Citation:
Zhang, YD,Wu, YS,Xu, YQ,et al. Excessive Exoergicity Reduces Singlet Exciton Fission Efficiency of Heteroacenes in Solutions[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2016,138(21):6739-6745.
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