Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.30: Poster
Monday, April 1, 2019, 17:30–19:30, Poster B1
Impact of incorporating ultrastable glass layers on device efficiency and stability of organic light-emitting diodes — •Elisabeth Birgit Schwarz1, Paul-Anton Will1, Joan Ràfols-Ribé2, Christian Hänisch1, Marta Gonzalez-Silveira2, Simone Lenk1, Javier Rodríguez-Viejo2, and Sebastian Reineke1 — 1Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Germany — 2Group of Nanomaterials and Microsystems, Universitat Autònoma de Barcelona, Spain
For current and future applications of organic-light emitting diodes (OLEDs), high device efficiency and stability are required. Additionally, to keep the process of making OLEDs competitive in the real production, simple device architecture and reproducibility are crucial. In this work, we present the incorporation of ultrastable glass layers in OLEDs as a concept that does not require material refinement or changes in stack architecture and is hence suggested to be generally applicable. At the same time, it allows to increase both, external quantum efficiency and lifetime of the OLEDs, by more than 15% compared to reference devices. This enhancement is achieved by fabricating several of the functional organic layers as ultrastable glasses through adjusting the substrate temperature and hence the growth conditions during physical vapor deposition. Ultrastable glasses appear as thermodynamically most favorable state and, thus, most stable molecular conformation in disordered solids achievable nowadays. We present detailed studies for OLEDs with four different phosphorescent emitters.