Titre : Crosslinkable semiconductors for use in solution-processed organic light-emitting diodes (OLED).
Cette conférence sera prononcée par le professeur Klaus Meerholz du département de chimie de l'Université de Cologne. Elle est commanditée par le Centre de recherche sur les materiaux auto-assemblés (CRMAA) et sera donnée en anglais.
Résumé : Organic light emitting diodes (OLEDs) based on electroluminescent conjugated polymers are considered a promising alternative for display and lighting applications, mainly due to their better compatibility with low-cost production techniques and large substrates. A challenge is multiple-layer deposition to improve the efficiency of the devices and, as a result, their lifetime. We have in the past developed photochemically crosslinkable semiconductors for fabrication of complex multilayer OLED and lithographic RGB-pixelation down to the micron scale. Grey- scale lithographic capability has been demonstrated, allowing the fabrication of multiple cavities with different lengths in a single processing step and thus permits monolithic integration of multiple OLEDs with different emission wavelengths on a single substrate. By use of nanoporous hole-injection layers improved outcoupling has been demonstrated. Recently, we demonstrated a surface-initiated crosslinking process with high potentials in printing and 3D- coatings. After curing the materials feature excellent thermal robustness, allowing to process on top even elevated temperatures (e.g. up to 200C).
