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.