Synthesis and luminescence of red MEH-PPV:P3OT polymer

This paper investigates the synthesis processes for poly(3-octylthiophene) (P3OT) and poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The proton nuclear magnetic resonance (1H NMR) and the Fourier transform infrared spectrophotometer (FTIR) were used to identify the chemical structure and functional group of synthesized polymers, respectively. The efficient Förster energy transfer from P3OT to MEH-PPV and the dilution of MEH-PPV with P3OT leaded to an enhanced red emission. When the concentration of P3OT was 30 wt%, the optimal photoluminescence (PL) intensity of MEH-PPV:P3OT was obtained, with wavelength at 580 nm. A PL quenching phenomenon was observed owing to the higher blending concentration of P3OT. The current density was 0.204 A/cm2 at 1.3 V for the red polymer light-emitting diode with the structure of Al/MEH-PPV:P3OT/ITO, and the CIE chromaticity coordinates were at x = 0.66 and y = 0.34.