Author/Authors :
Zhao، نويسنده , , Xiangjie and Liu، نويسنده , , Yingliang and Meng، نويسنده , , Kang and Zeng، نويسنده , , Qi and Wang، نويسنده , , Shufeng and Gong، نويسنده , , Qihuang، نويسنده ,
Abstract :
Steady-state and picosecond transient spectroscopy measurements are applied to study the photo-physics of three carbazolenevinylene derivatives: alternatively conjugated oligomer of alkylated carbazole and phenylene/thiophene/furan (PBC/PBT/PBF), bridged by vinyl group. Their fluorescence spectra show a bathochromic phenomenon towards solvent polarity. The fluorescence decays of PBF are found to be bi-exponential, while those of PBT and PBC are simple single exponential. It is suggested that PBF is non-planar conformation at ground state and twists to planar conformation after excitation. This chain twisting process of PBF is verified by viscosity dependent fluorescence decay.
