The photo-electricity of four 4-N,N-diphenylaminostilbene-like electroluminescent materials, which exhibit intense photoluminescence in CHCl₃ with their emission maximal range from 435 nm to 465 nm, were studied by UV-vis spectra, photoluminescent spectra, cyclic voltammetry and differential pulse voltammetry. Their band gaps E_g and ionization potentials P_I calculated are 2.78～2.88 eV and 5.70～5.90 eV, respectively. The electrochemistry behavior was analyzed, and the relationship among photoluminescent property, electronic structure and different substituents was systematically discussed. The result indicates that while HOMO level of compound is raised by electron-donor (OCH₃) group, the oxidative onset potentials and the ionization potentials are decreased, but while LUMO level is lowered by the electron-acceptor (—Cl) group, the oxidative onset potentials and electron affinities are increased. The band gap of the molecules is decreased in both cases, which results in the red shift of UV-Vis and photoluminescent spectra.

Key words: triarylamine, electroluminescence, hole-transporting material, substituent