title: The ultrafast dynamics and nonlinear optical properties of tribranched styryl derivatives based on 1,3,5-triazine.
abstract: By using the femtosecond laser spectroscopic techniques, we have studied the ultrafast response and the nonlinear optical properties of three molecules with donor-acceptor structure (denoted as T01, T02, and T03). Two-photon absorption (2PA) cross sections measured by the open aperture Z-scan technique were determined to be 77, 90, and 410 GM for T01, T02, and T03, respectively. The relaxation dynamics of the excited states were measured by two-color femtosecond pump-probe and time-resolved photoluminescence (PL) experiments. By changing the solvent from chloroform (CHCl3) to dimethyl sulfoxide (DMSO), the transient dynamics was found changed significantly and the decay time of PL emission decreased dramatically because DMSO with large dipole moment accelerates the cross-transfer process and the nonradiative process in the molecules.
authors.affiliation: Physics Department, Fudan University, Shanghai 200433, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Rui
authors.initials: R
authors.lastname: Tong
authors.forename: Rongyi
authors.initials: R
authors.lastname: Zhu
authors.forename: Fanshun
authors.initials: F
authors.lastname: Meng
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.forename: Shixiong
authors.initials: S
authors.lastname: Qian
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D002725:Chloroform / Q000737:chemistry; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D007834:Lasers; D008956:Models, Chemical; D008962:Models, Theoretical; D008968:Molecular Conformation; D017785:Photons; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods; D013057:Spectrum Analysis; D013997:Time Factors; D014227:Triazines / Q000737:chemistry*
chemical_list: D012997:Solvents; D014227:Triazines; D002725:Chloroform; D004121:Dimethyl Sulfoxide