Universal Polymeric Hole Transporting Material for Solution-Processable Green and Blue Thermally Activated Delayed Fluorescence-OLEDs
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초록
내용
In this study, a new vinyl polymer (PmCP) containing hole-transporting 1,3-di(9H-carbazol-9-yl)benzene (mCP) in the side chain was successfully synthesized via radical polymerization. PmCP showed good film-forming ability and thermal stability. Moreover, PmCP has a higher triplet energy value and hole mobility than poly(N-vinylcarbazole) (PVK). PmCP-based solution-processable thermally activated delayed fluorescence organic light-emitting diodes TADF-OLEDs containing green- and blue-emitting layers were easily fabricated without damaging the lower hole transport layer (HTL) while using ethyl acetate as an orthogonal solvent. The corresponding OLEDs possess high external quantum efficiencies of 29.60 % and 11.00 % for the green- and blue-emitting devices, respectively. It was confirmed that PmCP as a solution-processable HTM can replace PVK and is universally applicable to both green- and blue-emitting devices.