Researchers at Penn State University, with funding from the DOE, suggest a new way to improve the light extraction from OLED devices (EQE). The idea is to introduce electrically inert and low cost "dilution" molecules to the hole and electron transport layers, and so reduce the reflection of these layers which increases the outcoupling efficiency of these layers.
The added molecules do not degrade and actual performance - and should not increase production costs. The researchers are currently modeling and simulating molecules and device stacks. Eventually, the researchers aim to demonstrate multi-stack OLEDs with internal light extraction efficiency exceeding 75%.