  Our research shows that commercially available graphene on quartz modified
with rhenium oxide meets the requirements for its use as a conductive and
transparent anode in optoelectronic devices. The cluster growth of rhenium
oxide enables an increase in the work function of graphene by 1.3 eV up to 5.2
eV, which guarantees an appropriate adjustment to the energy levels of the
organic semiconductors used in OLED devices.
