Electrochemical,thermal,and photophysical properties of novel two-photon absorption chromophores

Electrochemical,thermal,and photophysical properties of novel two- (BPODPA),four- (BBPOPA),and six-branch (TBPOA) triphenylamine chromophores are studied.The decomposition temperature of chromophores reaches 373 -412 ~C.The electrochemical properties is explored by cyclic voltammetry.The ionization potential of chronlophores is in the range of 5.14 - 5.18 eV.Excitation at 400 nm reveals emission peaks at 483 - 487 nm and the fluorescence quantum yields are 0.73 - 0.75 in CH2Cl2.Two-photon absorption (TPA) properties of chromophores are measured by nonlinear transmission method.The maxTBPOA,7024 GM for BBPOPA,and 1227 GM for BPODPA,respectively.When pumped with 800-nm laser irradiation,chromophores show strong two-photon excited blue-green fluorescence at 502 - 518 nm.These results provide a basis for understanding the electronic and optical properties of the conjugated multi-branch chromophore in terms of the underlying molecular and electronic structures.