5.1: Purity of OLED‐Materials and the Implication on DevicePerformance

Abstract

Abstract The purity of OLED materials is examined by various analytical tools down to ppm level. Especially halogenated impurities are found to have a significant effect on device performance. HPLC MS coupling methods are needed to identify those harmful impurities. Three case studies are described, but the results are likely to be representative for most classes of OLED materials.