Precision Synthesis of Thermally Crosslinkable Hole Transporting Polymers <em>via</em> Living Anionic Polymerization for Solution-Processable OLEDs
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초록
내용
To fabricate the multilayer organic light emitting diodes (OLEDs) by a solution process, the previously formed lower layer should have excellent solvent resistance. In this study, well-defined block copolymers (poly(A-b-B)) containing hole transporting triphenylamine group and thermally crosslinkable benzocyclobutene group was precisely synthesized by living anionic polymerization as a hole transport material (HTM) for solution-processed OLEDs. The cured poly(A-b-B) films showed good film-forming ability and excellent solvent resistance. Among them, poly(A-b-B)3 with the highest molecular weight was tested as the HTM in OLED device. The device performance was superior to the familiar poly(9-vinylcarbazole) (PVK)-based device used as a reference. Therefore, it was confirmed that poly(A-b-B) can be a new HTM to replace PVK in solution-processable OLEDs.