Crosslinkable Bis(diphenylamine)‐Substituted Mixed Dihydroindeno[1,2‐b]fluorenes for Solution‐Processed, Multilayer OLEDs

摘要： The synthesis and application of a series of crosslinkable bis(diphenylamine)-substituted mixed dihydroindeno[1,2-b]fluorenes as model systems for the fabrication of solution-processed, multilayer OLEDs is described. Introducing a novel functionalization approach by C(sp3)-C(sp2) Suzuki-Miyaura reactions, the synthesis is based on a modular strategy, leading to eight nearly isoelectronic derivatives which allow for the observation of structure-property-relationships in the context of crosslinkable hole-transport materials, e.g. for use in organic light-emitting diodes (OLEDs). By systematically altering structural parameters, such as the number of crosslinkable oxetane moieties per molecule (2-6 moieties) and their position of attachment (geminal and/or lateral), process relevant thermal properties such as thermal stability and glass-transition temperature can be influenced and allow for the investigation of their impact on the crosslinking behavior and the resulting device performance.