1 research outputs found
Unraveled Face-Dependent Effects of Multilayered Graphene Embedded in Transparent Organic Light-Emitting Diodes
With increasing demand
for transparent conducting electrodes, graphene has attracted considerable
attention, owing to its high electrical conductivity, high transmittance,
low reflectance, flexibility, and tunable work function. Two faces
of single-layer graphene are indistinguishable in its nature, and
this idea has not been doubted even in multilayered graphene (MLG)
because it is difficult to separately characterize the front (first-born)
and the rear face (last-born) of MLG by using conventional analysis
tools, such as Raman and ultraviolet spectroscopy, scanning probe
microscopy, and sheet resistance. In this paper, we report the striking
difference of the emission pattern and performance of transparent
organic light-emitting diodes (OLEDs) depending on the adopted face
of MLG and show the resolved chemical and physical states of both
faces by using depth-selected absorption spectroscopy. Our results
strongly support that the interface property between two different
materials rules over the bulk property in the driving performance
of OLEDs