Synthesis and Electroluminescent Properties of Polyurethane with Stilbene Dye Pendant

摘要

A polyurethane (PU) derivative with a stilbene sidechain was prepared from 4-cyano-4'-[N,N-bis(2-hydroxyethyl)amino] stilbene and 2,4-tolylene diisocyanate (2,4-TDI). Thestilbene dye was synthesized by Wittig reaction of 4-[N,N-bis(2-hydroxyethyl)amino] benzaldehye with (4-cyanobenzyl) triphenylphosphonium chloride. The molecular structures were confirmedby elemental analysis, FT-IR and 1H-NMR spectroscopy and thethermal properties were investigated by DSC. The PU derivativeexhibits strong photoluminescence (PL) in the green spectralregion peaking at 510nm. Single-layer electroluminescent deviceswith ITO and MgAg as electrodes were fabricated via spin-coating from PU solution.