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Affiliation of Author(s):材料科学工程学院
Journal:CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Funded by:自选课题
Key Words:Transient absorption spectroscopy, Ultrafast dynamics, Temperature-dependent, Polarity-dependent, In-tramolecular charge transfer state
Abstract:The relaxation paths for triphenylamine(TPA)-2,3-dicyanopyrazino phenanthrene(DCPP), which has a pull-push structure, were investigated via steady-state, time-resolved spectroscopy involving transient absorption and time-correlated single photon counting. By changing the solvent polarity we found that an intramolecular charge transfer(ICT) state acting as a "bright" state was responsible for the fluorescence character of TPA-DCPP. Meanwhile, a "dark" state gradually appeared and competed with the ICT state. This was likely to be responsible for the polarity-dependent evolution of fluorescence intensity and fluorescence lifetime. The temperature-dependent fluorescence character of the TPA-DCPP in toluene exhibited ICT processes at high temperatures prior to the relaxation path from the initial excited state to the ground state. Our results provide useful insight into the optoelectronic properties of these kinds of molecules.
First Author:zhongqiulin
Indexed by:Journal paper
Volume:33
Issue:3
Page Number:2
ISSN No.:1005-9040
Translation or Not:no
CN No.:22-1183/O6
Date of Publication:2017-05-06
