Characterization of Organic Light Emitting Diodes

Abstract

Technology behind Organic Light Emitting Diodes (OLEDs) is under intense development, as the drive for more efficient light sources is accelerating due to environmental and economic concerns. However, the emission profiles of devices with novel organic materials and photonic structures require angle-resolved spectroscopic characterization to determine device performance accurately. This thesis details the design, fabrication, and validation of a custom, reconfigurable goniometric system capable of semi-circular spectroscopic scans with an angular resolution of 0.45 degrees. Additionally, a temporary encapsulation method for research OLEDs is presented. Using the developed system, an electroluminescent scan was performed on a blue OLED, revealing a non-Lambertian emission profile. These results were used to derive a shape correction factor of approximately 1.7, which could be used to accurately calculate the External Quantum Efficiency (EQE).