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题名: Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages
作者: Wan, Yan2;  Yan, Linyin2;  Zhao, Zujin1;  Ma, Xiaonan2;  Guo, Qianjin2;  Jia, Mingli2;  Lu, Ping1;  Ramos-Ortiz, Gabriel3;  Luis Maldonado, Jose3;  Rodriguez, Mario3;  Xia, Andong1
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2010-09-16
DOI: 10.1021/jp104868j
卷: 114, 期:36, 页:11737-11745
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: We report a series of stiff dendrimers (referred to as T1, T2, T3, and T4) that have both gigantic two-photon absorption (TPA) cross sections up to 25 000 GM and strong two-photon excited fluorescence (TPEF) with fluorescence quantum yield of similar to 0.5. The large TPA cross sections and high quantum yields of these dendrimers are directly related to their geometrical structures, where the polycyclic aromatic pyrene is chosen as the chromophoric core because of its planar and highly pi-conjugated structure, fluorene moieties as dendrons extend the conjugation length through the planar structure, and carbazole moieties are modified at three-, six-, and nine-positions as electron donor. All of these groups are linked with acetylene linkage for effective a-electron delocalization, leading to large TPA cross section and high fluorescence quantum yield. The spectral properties of all dendrimers are investigated by one- and two-photon excitations. Furthermore, steady-state fluorescence excitation anisotropy and quantum chemical calculation are also employed to determine the structure-related mechanism of these dendrimers with gigantic TPA cross sections and high TPEF efficiency. We then show that the improvement of branched chains in the T-series dendrimers enhances the light-harvesting ability. The core emission spectra, fluorescence quantum yield, and fluorescence lifetime are almost invariable by directly exciting the dendrons. These results will provide a guideline for the design of useful two-photon materials with structural motifs that can enhance the TPA cross-section and fluorescence quantum yield of a molecule without causing a red shift of the one- and two-photon excitation wavelengths for specific applications.
关键词[WOS]: STRUCTURE-PROPERTY RELATIONSHIP ;  ENERGY-TRANSFER ;  PHOTOPHYSICAL PROPERTIES ;  ORGANIC NANODOTS ;  LIVING TISSUE ;  CALCIUM WAVES ;  LIVE TISSUE ;  CARBAZOLE ;  CHROMOPHORES ;  EXCITATION
语种: 英语
WOS记录号: WOS:000281404500007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141964
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China
3.Ctr Invest Opt, Guanajuato 37000, Mexico

Recommended Citation:
Wan, Yan,Yan, Linyin,Zhao, Zujin,et al. Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2010,114(36):11737-11745.
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