• Kunz, Susanna V.
• Ranasinghe, Chandana Sampath Kumara
• Shaw, Paul E.
• Cole, Cameron M.
• Baumann, Thomas

Abstract

<p>Thermally activated delayed fluorescent (TADF) materialsare extensively investigated as organic light-emitting diodes (OLEDs)with TADF emitting layers demonstrating high efficiency without the useof heavy metal complexes. Therefore, solution-processable and printableTADF emitters are highly desirable, moving away from expensive vacuumdeposition techniques. In addition, using emissive materials notrequiring an external host simplifies the fabrication processsignificantly. Herein, OLEDs using a solution-processable TADF polymerthat do not need an external host are introduced. The non-conjugatedTADF polymer features a TADF emitter(4-(9H-carbazol-9-yl)-2-(3′-hydroxy-[1,1′-biphenyl]-3-yl)-isoindoline-1,3-dione)as a side chain, as well as a hole-transporting side chain and anelectron-transporting side chain on an inactive polymer backbone. Allorganic layers of the OLEDs are fabricated using solution processingmethods. The OLEDs with inkjet-printed emissive layers have comparablemaximum current and external quantum efficiency as their spin-coatedcounterparts, exceeding luminance of 2000 cd m⁻². The herein-explored strategy is a viable route toward self-hosted printable TADF OLEDs.</p>

Topics

• impedance spectroscopy
• polymer