Spy on OLEDs
Begeleider(s): ir. Michiel Callens


Organic Light Emitting Diodes (OLEDs) are an exciting and rapidly developing technology. They are revolutionizing the display market, showing unprecedented colour rendering and contrast.
Besides this these OLEDs can also be made flexible and even transparent! This is truly the technology of tomorrow! The most exciting thing, from a research perspective, is that this is a relatively new field and there is still plenty of room for improvement. 

One of the most important aspects of improving OLED technology is optical design of their multi-layer structure. These layers need to be controlled with nanometer precision and small variations on the thickness can have profound effects on the overall efficiency of the end product. We have the capability of making these devices with good precision as well as the software to simulate them. However, due to process variations and uncertainty one can never truelly know how the devices behave in terms of optical outcoupling and waveguiding. 

The emission that can be seen by an observer only tells part of the story and the intrecate optical effects that occur inside the inner layers remains hidden, preventing full understanding.




In this master thesis the student will have to do both simulations and experimental work. The goal is to attach a high index lens to the back mirror of an OLEDs using an index matching fluid. By doing this the emission inside the OLED, that would otherwise remain hiden can be probed. Using this method one could "spy" on the OLED and fully understand the inner workings. The student will have to desing a setup to spy on the OLED. Using the setup one can then probe OLEDs, which the student will also design and make using our propriatary software and dedicated OLED system, and determine the extent of proces variations or other factors.