With the aim to improve the photonic efficiency of an organic light emitting diode (OLED) and its
display duration, both the hole transport layer (HTL) and the emitting layer (EML) were prepared as
nanostructured thin films. For the HTL nanocomposite films were prepared by spin coating solutions of
poly(vinylcarbazole) (PVK) and PEDOT-PSS containing TiO2nanoparticles onto low resistivity ITO
substrates; for the EML, TiO2-embedded MEH-PPV (MEH-PPV+nc-TiO2) conjugate polymers were spincoated
onto the HTL. OLEDs prepared from above mentioned films have the structure of multilayers such as
Al/MEH-PPV+nc-TiO2/PVK+nc-TiO2/ITO and Al/MEH-PPV+nc-TiO2/PEDOT-PSS+nc-TiO2/ITO.
Characterization of the nanocomposite films showed that both the I-V characteristics and the
photoluminescence spectra of the nanocomposite materials were significantly enhanced in comparison to the
standard polymers. ?? 2009 IOP Publishing Ltd.