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. 2022 Aug;43(16):e2200118.
doi: 10.1002/marc.202200118. Epub 2022 Apr 12.

Cibalackrot Dendrimers for Hyperfluorescent Organic Light-Emitting Diodes

Nicholle R Wallwork  1 , Masashi Mamada  2 , Angus B Keto  3 , Sarah K M McGregor  1 , Atul Shukla  4 , Chihaya Adachi  2 , Elizabeth H Krenske  3 , Ebinazar B Namdas  4 , Shih-Chun Lo  1
Affiliations

Cibalackrot Dendrimers for Hyperfluorescent Organic Light-Emitting Diodes

Nicholle R Wallwork et al. Macromol Rapid Commun. 2022 Aug.

Abstract

Hyperfluorescent organic light-emitting diodes (HF-OLEDs) enable a cascading Förster resonance energy transfer (FRET) from a suitable thermally activated delayed fluorescent (TADF) assistant host to a fluorescent end-emitter to give efficient OLEDs with relatively narrowed electroluminescence compared to TADF-OLEDs. Efficient HF-OLEDs require optimal FRET with minimum triplet diffusion via Dexter-type energy transfer (DET) from the TADF assistant host to the fluorescent end-emitter. To hinder DET, steric protection of the end-emitters has been proposed to disrupt triplet energy transfer. In this work, the first HF-OLEDs based on structurally well-defined macromolecules, dendrimers is reported. The dendrimers contain new highly twisted dendrons attached to a Cibalackrot core, resulting in high solubility in organic solvents. HF-OLEDs based on dendrimer blend films are fabricated to show external quantum efficiencies of >10% at 100 cd m-2 . Importantly, dendronization with the bulky dendrons is found to have no negative impact to the FRET efficiency, indicating the excellent potential of the dendritic macromolecular motifs for HF-OLEDs. To fully prevent the undesired triplet diffusion, Cibalackrot dendrimers HF-OLEDs are expected to be further improved by adding additional dendrons to the Cibalackrot core and/or increasing dendrimer generations.

Keywords: Cibalackrot dendrimer; hyperfluorescence OLEDs; solution process; twisted mesityl dendrons.

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