Investigation on Photophysical Properties of D-π-A-π-D-Type Fluorenone-Based Linear Conjugated Oligomers by Using Femtosecond Transient Absorption Spectroscopy.
The effects of π-spacer and electron donor groups on the photophysical behaviors of fluorenone-based linear conjugated oligomers have been systemically investigated. Solvent-dependent steady-state measurements exhibit that the fluorene vinylene (FV) spacer and the electron-donating ability of donor group are able to modulate the spectral features of oligomers and the fluorescence quantum yield could decrease with the increasing of the solvent polarity. Meanwhile, quantum chemical calculation simulates their absorption spectra, and analyzes their electron transition components simultaneously. The transient absorption measurements focus on the photoexcitation dynamics of these oligomers in the toluene solution, which show that an intramolecular charge transfer state exists in the relaxation process of excited states, and its generation process could accelerate with the introduction of FV spacer and the enhancement of donor strength.
Femtosecond Laser Laboratory, College of Physics, Jinlin University, Changchun, China.|Department of Science, Zhijiang College of Zhejiang University of Technology, Hangzhou, China.
Tian-Hao
TH
Huang
Femtosecond Laser Laboratory, College of Physics, Jinlin University, Changchun, China.
Ying-Hui
YH
Wang
Femtosecond Laser Laboratory, College of Physics, Jinlin University, Changchun, China.
Zhi-Hui
ZH
Kang
Training Department of Air Force Aviation University, Changchun, China.
Jin-Bo
JB
Yao
College of Chemistry, Jinlin University, Changchun, China.
Ran
R
Lu
Femtosecond Laser Laboratory, College of Physics, Jinlin University, Changchun, China.
Han-Zhuang
HZ
Zhang