Novel poly-Schiff bases containing 4,4′-diamino-triphenylamine as hole transport material for organic electronic device

Two novel functional conjugated poly-Schiff bases containing triphenylamine unite were synthesized by condensation polymerization of 4,4'-biamine triphenylamine and dialdehydes in solution, which having conjugation throughout the molecule chain are soluble in both polar and nonpolar solvents, and the optical, electrochemical properties were studied by the UV-visible spectrum, photoluminescence (PL) spectrum and cyclic voltammetry(CV) technology. The optical band gaps were calculated as approximately 2.33 and 2.19eV for PSB1 and PSB2, respectively. The wavelength of PSB1 exhibiting a maximum PL intensity was ca. 457 nm in chlorobenzol. The mobility of hole carrier in PSB1 (poly-Schiff base-1) film was also measured to be mu = 1.68 x 10(-4) cm(2) V-1 s(-1) by means of time-of-flight (TOF) technique. The polymer electroluminescence (EL) device was prepared with PSB-1 used as hole transporting moiety by spin coating. (C) 2004 Elsevier B.V. All rights reserved.