Synthesis of crosslinkable hole transporting polymers for organic light emitting diodes (OLEDs)
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As a result of intensive research over the course of the past decade and beyond, great strides have been made in developing organic light emitting diodes (OLEDs) for display and solid-state lighting applications. One of the key remaining obstacles to OLED production is the difficulty of fabricating the multi-layer architecture required for high-performance devices. Vacuum deposition, the conventional fabrication approach is expensive and is not readily scalable, while the main alternative approach - solution processing is hindered by inter-layer incompatibilities. A promising answer to the latter issue involves rendering each layer insoluble after deposition by inducing crosslinking, thus making the material compatible with the next layer deposited above it. The goal of this project was the preparation of novel crosslinkable materials for applications as the hole-transport layer (HTL) in OLEDs. A series of copolymers was prepared, integrating a hole transport group on one chain and a crosslinker on the other. The crosslinking groups studied were benzocyclobutene (BCB), oxetane (OXT), and trifluorovinyl ether (TFVE). Thin films of the target materials were prepared, processed to induce crosslinking, and their solvent resistance was evaluated. It was found that materials incorporating BCB and OXT groups exhibited effective solvent resistance, even after relatively short processing times.