Synthesis of Water/Methanol-Soluble Poly(Sodium 4-Styrenesulfonate) Copolymer Containing Triazole and Application on Polymer Light Emitting Diode

In this study, a series of water/methanol-soluble copolymers were synthesized by radical copolymerization of sodium 4-styrenesulfonate and the 4-styrenesulfonamide derivative containing aromatic 1,2,4-triazole. Due to good electron affinity of aromatic triazole, this moiety is introduced into the side group of polymer to improve the electron-transporting property for application on Polymer light emitting diode, PLED. These polymers were characterized by NMR, mass spectrometer, gel permeation chromatography (GPC), thermogravimetric analyzer (TGA), differential scanning calorimeter (DSC), UV-Vis spectrophotometer, and cyclic voltametry. PLED devices have been made by water/methanol-soluble copolymers, and the performance was compared with standard device. At the results of device, ITO / PEDOT：PSS / PVK+PBD(40%)+Ir(PPy)3(8%) / cp50 / Mg / Ag has the best performance: Turn-on voltage is 8.7 V. Maximum brightness is 4849 cd/m2 on 21.0 V. Maximum current efficiency is 15.65 cd/A with brightness of 3437 cd/m2.