Date of Award


Degree Name

MS in Electrical Engineering


Electrical Engineering


David Braun


Polymer light emitting diodes (PLEDs) represent new technology for display applications. However, these polymer based devices could benefit from increased efficiency and material longevity.

This thesis examines how preprocessing PLED indium tin oxide (ITO) anodes and reprocessing previously used substrates can create brighter, more efficient PLEDs. The project accomplishes this by simple changes to fabrication techniques, such as additional cleaning, etching, or thermal annealing, to improve pristine device luminance and efficiency. The project also examines substrate re-use techniques to repair ITO substrate damage, and effects of polymer aging on PLED luminance and efficiency.

PLEDs fabricated with polymer aged to varying degrees exhibit increased efficiency and luminance. Etching previously used substrates allows PLED re-use; substrates etched in hydrochloric acid also demonstrate increased efficiency and luminance.

Preprocessing improves device performance, while etching results in reusable substrates.