Flexible Ink-Jet Printed Polymer Light-Emitting Diodes using a Self-Hosted Non-Conjugated TADF Polymer.

Thermally activated delayed fluorescent (TADF) emitters have become the leading emissive materials for highly efficient organic light emitting diodes (OLEDs). The deposition of these materials in scalable and cost-effective ways is paramount when looking towards the future of OLED applications. Herein, we introduce a simple OLED with fully solution-processed organic layers, where the TADF emissive layer is ink-jet printed. The TADF polymer has electron and hole conductive side chains, simplifying the fabrication process by removing the need for additional host materials. The OLED has a peak emission of 502 nm and a maximum luminance of close to 9600 cd m -2 . The self-hosted TADF polymer is also demonstrated in a flexible OLED, reaching a maximum luminance over 2000 cd m -2 . Our results demonstrate the potential applications of our self-hosted TADF polymer in flexible ink-jet printed OLEDs and, therefore, for a more scalable fabrication process. This article is protected by copyright. All rights reserved.