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Twisted Phosphors that Violate Kasha's Exciton Model in Organic Systems

Chinese Journal of Chemistry 2024年第11期42卷 1237-1246页

作者： Boyi Fu Guangming Wang Jiuyang Li Junbo Li Xun Li Xiaoya Zhao Shuhui Ding Guoping Yan Qianqian Yan Kaka Zhang School of Materials Science and Engineering Wuhan Institute of TechnologyWuhanHubei430205 China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai200032 China

Kasha's exciton model proposes that T1 energy levels of organic compounds are insensitive to molecular aggregation and microenvironment change because of negligible small transition dipole moments of T1 *** model holds true in most organic systems till *** we report the fabrication of twisted organic phosphors with intramolecular charge transfer characters and flexible molecular *** doped into different organic matrices,the twisted phosphor adopts different conformation,exhibits distinct phosphorescence colors and T1 energy levels,which violates Kasha's exciton model in organic *** that the change of phosphorescence colors and maxima can be readily distinguished by human eyes and conventional instrument,the twisted phosphors would be exploited as a new type of molecular probe,which would exhibit potential application in optical sensing and stimuli-responsive systems.

关键词： Afterglow Twisted phosphor triplet excited state Room-temperature phosphorescence Luminescence Spin-orbit coupling

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Progress in dynamic study on the triplet excited states and radical ions of DNA and its components

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Progress in Natural Science:Materials International 2000年第2期 3-12页

作者：宋钦华林念芸姚思德张加山 China Chinese Academy of Sciences Laboratory of Radiation Chemistry Shanghai 201800 Shanghai Institute of Nuclear Research

Progress in dynamic study on the triplet excited states and radical ions of DNA and its components is reviewed. It has been found that acetone is the only effective sensitizer for the study of the triplet excited states of DNA components. The transient absorption spectrum of guanyl radical cation resulting from the interaction of triplet acetone and DNA was observed directly, and the original evidence for selective damage of DNA by excited photosensitizer was obtained for the first time, which offered a new pathway for obtaining the main transient species of selective damage of DNA by photonucleases and illustrating initial oxidation mechanism of DNA via electron transfer.

关键词： DNA triplet excited state radical cation laser flash photolysis.

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Singlet relaxation dynamics and long triplet lifetimes of thiophene-coupled perylene diimides dyads:New insights for high efficiency organic solar cells

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Chinese Chemical Letters 2020年第11期31卷 2965-2969页

作者： Qingxuan Fan Wenjun Ni Lingcheng Chen Gagik G.Gurzadyan Yi Xiao state Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China Stare Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDalian University of TechnologyDalian 116024China

In the active layer of organic solar cells(OSCs),the lifetime of triplet excitons is one of the decisive factors in the diffusion length and therefore has important impact on the power conversion efficiency of the ***,we have investigated singlet excited state relaxation dynamics and their triplet exciton lifetimes of two thiophene-coupled perylene diimides(PDI)dyads(2 PDI-Th and fused-2 PDI-Th),in order to provide a unique explanation in depth on their different performances in OSC *** the transient absorption(TA)spectra,the singlet excitons of 2 PDI-Th form excimers in the time scale of 1.5 *** the excimers go into the triplet state via intersystem crossing(ISC).In fused-2 PDI-Th,triplet excitons are generated directly from the singlet excited excitons via the efficient *** functional theory(DFT)calculations further support the formation of *** results indicate that 2 PDI-Th exhibits an H-typed molecular configuration which is beneficial to form the excimers,while fused-2 PDITh gives a twisted X-shaped configuration in the optimized ground and excited *** steady-state emission spectra,2 PDI-Th shows abroad and featureless spectral characteristics of the excimers with a decay time of 840 ps,which is much shorter than those of PDI(5.5 ns)and fused-2 PDI-Th(3.3 ns).The triplet lifetime(67 ms)of fused-2 PDI-Th is factor of 3 longer than that of 2 PDI-Th(22 ms).These results demonstrate that ring-fused structure is an efficient strategy to eliminate excimer formation and prolong the lifetime of triplet excitons,which provides a new insight for design of optoelectronic molecules for high efficiency organic solar cells.

关键词： Ultrafast relaxation dynamics triplet excited state Exciton lifetime Photophysical process Organic solar cell

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Transient Spectroscopic Properties of [60]Fullerene-Containing Cyclic Sulphoxide

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Chinese Chemical Letters 2002年第6期13卷 567-570页

作者： He Ping ZENG Zhi ZENG Ding Qiao YANG Department of Chemistry South China Normal UniversityGuangzhou 510631

The properties of the triplet excited state of [60]fullerene-containing cyclic sulphoxide have been investigated by time-resolved absorption spectroscopy. Transient absorption bands of [60]fullerene-containing cyclic sulphoxide showed two decay-components, which were attributed to triplet excited states of different spin multiplicity. The properties of photoexcited states of [60]fullerene-containing cyclic sulphoxide are also reported.

关键词： Fullerene-containing cyclic sulphoxide triplet excited state transient spectroscopic property time-resolved absorption spectroscopy.

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