Novel green light-emitting diode with high efficiency; synthesis and electroluminescent property of poly(2-(2′-ethylhexylthio)-5-methoxy-1,4-phenylenevinylene) (PMEHTPV)

Poly(2-(2′-ethylhexylthio)-5-methoxy-1,4-phenylenevinylene) (PMEHTPV) was synthesized in thin films via a water-soluble precursor polymer and characterized with thermogravimetric analysis (TGA), FT–IR, and elemental analysis, etc. The PMEHTPV film could be stretched up to 10 times and showed conductivity of 0.13 Scm⁻¹ when doped with FeCl₃. The 2-ethylhexylthio group resulted in blue-shifted absorption and emission compared to those of poly(2-2′-ethylhexyloxy-5-methoxy-1,4-phenylenevinylene) (MEH-PPV). The relative quantum efficiency of the device made by PMEHTPV was 20 times higher than that of MEH-PPV. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35 : 2253–2258, 1997