Abstract:
For the past few years, organic materials have been extensively investigated as
an electronic material for light emitting diodes. Organic materials offer strong
promise in terms of properties, processing and cost effectiveness. LEDs
developed from organic semiconductors as active layer are organic light
emitting diodes (OLEDs). In an OLED various loss mechanisms occur during
operation mechanism, which affects the efficiency of OLED. To improve the
external quantum efficiency various methods are employed. One of these
methods is insertion of low-index material between glass substrate and ITO
layer. By insertion of low-index layer beneath the glass substrate helps in
coupling out of substrate wave-guided modes trapped inside the device. But due
to large mismatch between the refractive indices of low-index layer and iTO
interface strong wave-guiding may occur in the Organic/ITO layers. As per the
results of my simulations the insertion of low-index layer beneath the substrate
decreases the transmission of the OLED device.
