Studies on morphological and optoelectronic properties of MEH-CN-PPV:TiO2 nanocomposites

Nanosized TiO2 has been synthesized solvothermally using an autoclave. X-ray diffraction and electron microscopy studies elucidate that the synthesized nanoparticles are strongly crystalline and are dominantly in anatase phase. UV-vis and photoluminescence (PL) spectroscopy studies show a blue shift phenomenon in the synthesized nanoparticle in contrast to the bulk anatase TiO2 which furnish evidence in support of quantum size effect. The nanocomposites of TiO2 and MEH-CN-PPV have been prepared and characterized structurally (AFM, TEM) and optically (absorbance and photoluminescence). The nanocomposites have been used in light emitting diodes and electroluminescence (EL) and current density (J-V) of the device has been evaluated. The enhanced EL at elevated voltages for MEH-CN-PPV:5% TiO2 hybrid device suggests influence of the reduced particle size and modified surface morphology. (C) 2012 Elsevier B.V. All rights reserved.