Green light-emitting diodes based on a hybrid TiO2 nanoparticle-conducting polymer blend

The energy transfer in a blend of conducting polymers, poly[9-vinylcarbarzole] (PVK) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), was investigated. Energy transfer from PVK to MEH-PPV leads to enhanced emission of MEH-PPV. Photoluminescence (PL) of the nanocomposite of TiO₂ and the blended polymer films was enhanced as the relative content of TiO₂ was increased, and, in particular, the most improved PL was observed for the optimal ratio of TiO₂ and these films emitted green light. These results provide further insight into the photophysics of conjugated polymers and the improvement of the current-voltage (I-V) characteristics of the devices based on blended conducting polymer systems.