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The design of extended multiple resonance thermally activated delayed fluorescence emitter based on polycyclic amine/carbonyl system

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Author(s)

Dianming Sun, Subeesh Madayanad Suresh, David Hall, Ming Zhang, Changfeng Si, David Bradford Cordes, Alexandra Slawin, Yoann Olivier, Xiaohong Zhang, Eli Zysman-Colman

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Abstract

The development of muliple resonance thermally activated delayed fluorescence (MR-TADF) materials possessing narrow emission spectra has attracted significant attention as emitters for high colour purity organic light emitting diodes (OLEDs). In this work, a simple design strategy is introduced to construct a MR-TADF emitter, DDiKTa, through dimerization of the known MR-TADF emitter DiKTa. This design permits concentration quenching to be largely suppressed, which is a known weakness of previously reported MR-TADF emitters. OLEDs based on DDiKTa show an EQEmax of 19% at a doping concentration of 9 wt%. The electrolumicence spectrum is red-shifted into the green, producing a rare example of a green-emitting MR-TADF OLED.
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Original languageEnglish
Pages (from-to)2018-2022
Number of pages5
JournalMaterials Chemistry Frontiers
Volume4
Issue number7
Early online date15 May 2020
DOIs
Publication statusPublished - 1 Jul 2020

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