Inkjet‐Printed Self‐Hosted TADF Polymer Light‐Emitting Diodes. Issue 12 (19th July 2022)

• Record Type: Journal Article
• Authors: Cole, Cameron M.; Kunz, Susanna V.; Shaw, Paul E.; Ranasinghe, Chandana Sampath Kumara; Baumann, Thomas; Blinco, James P.; Sonar, Prashant; Barner‐Kowollik, Christopher; Yambem, Soniya D.
• Is Part Of: Advanced materials technologies. Volume 7:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-19
• Subjects: inkjet printing -- organic light‐emitting diodes -- self‐hosted -- solution processing -- thermally activated delayed fluorescence -- thermally activated delayed fluorescent polymers; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202200648
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: Thermally activated delayed fluorescent (TADF) materials are extensively investigated as organic light‐emitting diodes (OLEDs) with TADF emitting layers demonstrating high efficiency without the use of heavy metal complexes. Therefore, solution‐processable and printable TADF emitters are highly desirable, moving away from expensive vacuum deposition techniques. In addition, using emissive materials not requiring an external host simplifies the fabrication process significantly. Herein, OLEDs using a solution‐processable TADF polymer that do not need an external host are introduced. The non‐conjugated TADF 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 an electron‐transporting side chain on an inactive polymer backbone. All organic layers of the OLEDs are fabricated using solution processing methods. The OLEDs with inkjet‐printed emissive layers have comparable maximum current and external quantum efficiency as their spin‐coated counterparts, exceeding luminance of 2000 cd m −2 . The herein‐explored strategy is a viable route toward self‐hosted printable TADF OLEDs. Abstract : Herein, a non‐conjugated polymer, carrying a thermally activated delayed fluorescence emitter pendant, a hole‐transporting pendant, and an electron‐transporting pendant is inkjet printed as a self‐hosted emissive layer in an organic light‐emitting diode (OLED). All organic layers of the OLED are solution processed.