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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.
Bayerl et al. (Thu,) studied this question.