Crosslinkable hole‐transport materials for preparation of multilayer organic light emitting devices by spin‐coating

Our approach to prepare multilayer light emitting devices (LEDs) by low‐cost spin‐coating techniques is the combination of spin‐coating and photo‐crosslinking. The oxetane functionality was used as the polymerizable moiety, which was crosslinked in bulk by a cationic mechanism. The resulting films were resistant against solvents used in subsequent spin‐coating steps. The synthesis of bis‐functionalized hole transporting triarylamines by palladium catalyzed C—N‐coupling reaction, their polymerization, characterization, and first application in two‐layer blue light emitting OLEDs are presented.