The effect of spatially distributed electron and hole blocking layers on the characteristics of OLEDs

The recombination probability and hence the maximum light intensity of OLEDs largely depends upon the controlled injection of charge carriers and their confinement. In single layer OLEDs, recombination of carriers is highly affected due to quenching effects at cathode. In multilayer OLEDs, effective use of blocking and emissive layers provides better recombination of charge carriers leading to improved electroluminescence, and high efficiency. In the present work, a study has been made on the effect of spatial distribution of electron and hole blocking layers in single layer and multiple quantum well structures on current, voltage, luminance, and efficiency of devices.