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Not the Sum of their Parts: Understanding Multi-Donor Interactions in Symmetric and Asymmetric TADF Emitters

Danos, Andrew; Gudeika, Dalius; Kukhta, Nadzeya; Lygaitis, Ramunas; Colella, Marco; Higginbotham, Heather; Bismillah, Aisha N; McGonigal, Paul R; Grazulevicius, Juozas V; Monkman, Andrew P

Not the Sum of their Parts: Understanding Multi-Donor Interactions in Symmetric and Asymmetric TADF Emitters Thumbnail


Authors

Dalius Gudeika

Nadzeya Kukhta

Ramunas Lygaitis

Marco Colella

Heather Higginbotham

Aisha N Bismillah

Paul R McGonigal

Juozas V Grazulevicius

Andrew P Monkman



Abstract

A pair of thermally activated delayed fluorescence (TADF) emitters with symmetric and asymmetric D-A-D structure are investigated. Despite displaying near-identical photoluminescence spectrum and quantum yields, the symmetric material possesses significantly better delayed fluorescence characteristics and OLED performance. Building on a previous study of analogous D-A materials we are able to explain these differences in terms of different strengths of electronic interactions between the two donor units. This interaction lowers the energy of the TADF-active triplet state in the asymmetric molecule, increasing its singlet–triplet energy gap and leading to worse performance. This result therefore demonstrates a new strategy to selectively control the triplet states of TADF molecules, in contrast to established control of singlet states using host environment. These results also show that multi-donor TADF emitters cannot be understood simply as the sum of their isolated parts; these parts have different electronic interactions depending on their relative positions, even when there is no scope for steric interaction.

Citation

Danos, A., Gudeika, D., Kukhta, N., Lygaitis, R., Colella, M., Higginbotham, H., …Monkman, A. P. (2022). Not the Sum of their Parts: Understanding Multi-Donor Interactions in Symmetric and Asymmetric TADF Emitters. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4737-4747. https://doi.org/10.1039/d1tc04171a

Journal Article Type Article
Acceptance Date Nov 18, 2021
Online Publication Date Nov 18, 2021
Publication Date Mar 28, 2022
Deposit Date Nov 19, 2021
Publicly Available Date Nov 19, 2021
Journal Journal of Materials Chemistry C
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 10
Issue 12
Pages 4737-4747
DOI https://doi.org/10.1039/d1tc04171a

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